CN108195465A - A kind of detection device and method - Google Patents
A kind of detection device and method Download PDFInfo
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- CN108195465A CN108195465A CN201711317591.5A CN201711317591A CN108195465A CN 108195465 A CN108195465 A CN 108195465A CN 201711317591 A CN201711317591 A CN 201711317591A CN 108195465 A CN108195465 A CN 108195465A
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- 238000001514 detection method Methods 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000003990 capacitor Substances 0.000 claims abstract description 13
- 238000012545 processing Methods 0.000 claims description 63
- 238000009434 installation Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 5
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- 238000006243 chemical reaction Methods 0.000 description 3
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- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003672 processing method Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 2
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- 230000000903 blocking effect Effects 0.000 description 1
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- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000541 pulsatile effect Effects 0.000 description 1
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- 238000011895 specific detection Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
- G01J1/46—Electric circuits using a capacitor
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Abstract
The technical issues of embodiment of the present invention provides a kind of detection device and method, and the accuracy when detection system for solving trigger-type detection detects in different scenes is relatively low.The detection device includes：Biasing circuit；Delay circuit, the charging capacitor including the divider resistance for being used to divide photosensor signal and for carrying out delay disposal to photosensor signal；Comparison circuit is connected respectively with biasing circuit and delay circuit, for comparing the voltage swing of received signal, and exports high level or low level；Feedback circuit, including analog switch it is in parallel with divider resistance, and the output terminal of the input terminal of analog switch and comparison circuit connect；Wherein, when detecting that comparison circuit exports high level, analog switch is switched to conducting state, enables divider resistance short circuit and when detecting that comparison circuit exports low level, analog switch is switched to off-state, and delay circuit is enabled to keep normal work.
Description
Technical field
The present invention relates to field of communication technology, more particularly to a kind of detection device and method.
Background technology
At present, in detection system, often with a kind of detection mode of low-power consumption --- trigger-type detects.Trigger-type is visited
When survey refers to without exception, system major part circuit is in standby mode, and only acquisition comparison circuit in part is working.If occur abnormal
Event then causes to acquire comparison circuit trigger signal wake-up system, alarm.It is for example, real by dark detection bright to light
It is existing energy saving or by sound size detection, for alarm etc..
Its internal realization of existing trigger-type detection system is upper usually as shown in Figure 1.In the detecting system, by detected letter
It number is compared with a fixed voltage, when detected signal is more than the fixed voltage, one indication signal of triggering gives rear class processing
System is used as reporting, and sends report information to remote platform in a wired or wireless fashion.Since this mode is typically only capable to refer to
Show result of detection with and without two states, environmental suitability is poor, so in many scenes in use, being as a result inaccurate.Than
Such as：The switch of light is detected, due to daytime and evening, room is near the window etc., it can all influence the absolute bright of switch lamp judgement
Degree.
Therefore, in the prior art using trigger-type detect detection system detected in different scenes when accuracy compared with
It is low.
Invention content
The embodiment of the present invention provides a kind of detection device and method, for solving the detection system of trigger-type detection in difference
Scene in detect when accuracy it is relatively low the technical issues of.
In a first aspect, the embodiment of the present invention provides a kind of detection device, include the following steps：
Biasing circuit, for adding a bias voltage to the photosensor signal of reception；
Delay circuit, it is in parallel with the biasing circuit, including divider resistance and charging capacitor, the divider resistance for pair
The photosensor signal is divided, and the charging capacitor is used to carry out delay disposal to the photosensor signal；
Comparison circuit, including first input end and the second input terminal, the first input end is connected with the biasing circuit,
Second input terminal is connected with the delay circuit, for the first input end and the second input terminal received signal
Voltage swing, and high level or low level are exported according to comparison result；
Feedback circuit, including an analog switch, the analog switch is in parallel with the divider resistance in the delay circuit, and
The input terminal of the analog switch is connect with the output terminal of the comparison circuit, and the feedback circuit is used for according to comparison circuit
Output level controls the analog switch to switch between off-state and conducting state；
Wherein, when detecting the comparison circuit output high level, the analog switch is switched to by off-state leads
Logical state enables the short circuit of the divider resistance in the delay circuit and when detecting the comparison circuit output low level, described
Analog switch is switched to off-state by the conducting state, and the delay circuit is enabled to keep normal work.
Optionally, the detection device further includes：
Block isolating circuit is connect respectively with the biasing circuit and the delay circuit, for being isolated in the photosensor signal
DC current, and the photosensor signal after isolated DC electric current is respectively transmitted to the biasing circuit and the deferred telegram
Road.
Optionally, when the analog switch is in the conduction state, the divider resistance short circuit in the delay circuit,
The charging capacitor is charged using the voltage of the photosensor signal.
Optionally, when the analog switch is off, the voltage of the first input end is the photosensitive letter
Number branch pressure voltage generated after the biasing circuit, the voltage of second input terminal are the photosensor signal through the delay
The delay voltage generated after circuit.
Second aspect, the embodiment of the present invention provide a kind of detection method, including：
Voltage division processing carries out the photosensor signal of reception by the biasing circuit in detection device respectively, obtains the first processing
Signal and by the delay circuit in the detection device to the photosensor signal carry out delay disposal, obtain second processing letter
Number；
Described first processing signal and the second processing signal are inputted to the comparator comparison voltage of the detection device
Size；
If it is determined that the comparator output high level, then control electric with the partial pressure of the delay circuit in the detection device
Resistance analog switch conducting in parallel, with the short circuit divider resistance, and the photosensor signal is passed through where the analog switch
Circuit directly inputs the comparator, and during the determining comparator output low level, disconnects the analog switch, prolong described in order
Slow circuit keeps normal work.
Optionally, the photosensor signal of reception is carried out respectively by the biasing circuit in detection device voltage division processing it
Before, further comprise：
By the block isolating circuit in the detection device to the DC current in the photosensor signal is isolated.
Optionally, further comprise：
The number of pulses that the low and high level of the comparator output is formed in record preset time；
According to the number of pulses and biasing difference, voltage change of the photosensor signal in the preset time is determined
Amount；Wherein, the biasing difference is the first voltage of the described first processing signal and the second voltage of the second processing signal
Between voltage difference.
The third aspect, the embodiment of the present invention provide a kind of detection device, including：
Acquisition module is carried out at partial pressure the photosensor signal of reception for passing through the biasing circuit in detection device respectively
Reason obtains the first processing signal and carries out delay disposal to the photosensor signal by the delay circuit in the detection device,
Obtain second processing signal；
Described first processing signal and the second processing signal are inputted the comparator of the detection device by input module
Comparison voltage size；
Control module, for if it is determined that the comparator export high level, control in the detection device with the delay
The analog switch conducting of the divider resistance parallel connection of circuit with the short circuit divider resistance, and the photosensor signal is passed through described
Circuit where analog switch directly inputs the comparator or if it is determined that when the comparator exports low level, disconnects the mould
Intend switch, the delay circuit is enabled to keep normal work.
Optionally, the detection device further includes：
Isolation module, for being carried out at partial pressure respectively to the photosensor signal of reception by the biasing circuit in detection device
Before reason, by the block isolating circuit in the detection device to the DC current in the photosensor signal is isolated.
Optionally, the detection device further includes：
Logging modle, the number of pulses that the low and high level for recording the comparator output in preset time is formed；
Determining module, for according to the number of pulses and biasing difference, determining the photosensor signal when described default
Interior voltage variety；Wherein, first voltage and the second processing of the biasing difference for the described first processing signal
Voltage difference between the second voltage of signal.
Fourth aspect, the embodiment of the present invention provide a kind of computer installation, and the computer installation includes processor, described
Such as second aspect the method is realized when processor is for performing the computer program stored in memory.
5th aspect, the embodiment of the present invention provide a kind of computer readable storage medium, the computer-readable storage medium
Matter is stored with computer instruction, when described instruction is run on computers so that computer is performed as described in second aspect
Method.
In the embodiment of the present invention, since the output terminal of the comparison circuit of detection device and the analog switch of feedback circuit connect
It connects, and the analog switch is in parallel with the divider resistance of delay circuit, i.e. the conducting of analog switch and disconnection is by the defeated of comparison circuit
Go out level control, therefore, bias voltage is added to the photosensor signal of reception by biasing circuit in detection device and passes through delay
Circuit to photosensor signal carry out delay disposal, and be separately input to comparison circuit carry out voltage swing comparison after, if more electric
Road exports high level, then triggers analog switch in feedback circuit and be connected, delay circuit short circuit, then the photosensor signal on delay circuit
Can comparison circuit be directly inputted by analog switch, then, with the increase of the voltage of photosensor signal, directly input comparison circuit
The voltage of photosensor signal will be greater than the voltage of the photosensor signal after bias voltage bias treatment, therefore the level of comparison circuit output
It will overturn, low level become from high level, that is, complete a pulse, analog switch disconnects at this time, the normal work of Postponement module
Make.Therefore, it when photosensor signal changes, can determine by the low and high level (respective pulses) for detecting comparison circuit output photosensitive
Whether the voltage of signal changes or even by calculating number of pulses, can also determine the voltage change amplitude of photosensor signal,
Therefore the accuracy of detection is higher.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly introduced, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, for this
For the those of ordinary skill in field, without having to pay creative labor, it can also be obtained according to these attached drawings
His attached drawing.
Fig. 1 is the internal structure of trigger-type detection system in the prior art；
Fig. 2 is the structure chart of detection device of the embodiment of the present invention；
Fig. 3 is the circuit diagram one of detection device in the embodiment of the present invention；
Fig. 4 is that change schematic diagram of the voltage with applied signal voltage is detected in detection device of the embodiment of the present invention；
Fig. 5 is the circuit diagram two of detection device in the embodiment of the present invention；
Fig. 6 is the flow chart of detection method in the embodiment of the present invention；
Fig. 7 is the module map of detection device in the embodiment of the present invention；
Fig. 8 is the structure chart of Computer device of the embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention is made below in conjunction with attached drawing into
It is described in detail to one step, it is clear that the described embodiments are only some of the embodiments of the present invention rather than whole implementation
Example.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without making creative work
All other embodiment, shall fall within the protection scope of the present invention.
Detection device in the embodiment of the present invention can be used for detecting the signals such as light or sound, obtain corresponding
Detectable signal, and detection device can also trigger corresponding warning device according to the detectable signal detected and alarm etc..
In the following, Figure of description and specific embodiment will be combined, the above described technique is demenstrated in detail.
Embodiment one
As shown in Fig. 2, the embodiment of the present invention provides a kind of detection device, the detection device can include biasing circuit 11,
Delay circuit 12, comparison circuit 13 and feedback circuit 14, wherein, biasing circuit 11 and delay circuit 12 respectively with comparison circuit 13
It is attached, feedback circuit 14 includes an analog switch, and the analog switch is in parallel with the divider resistance in delay circuit 12.
In practical applications, detection device may also include block isolating circuit 15, show the circuit together with dotted line frame in Fig. 2
Go out.Block isolating circuit 15 can be used for carrying out blocking processing to the photosensor signal that detection device receives, that is, be isolated in photosensor signal
The photosensor signal for including alternating current is inputted biasing circuit 11 and delay circuit 12 by DC current respectively, is contributed to flexibly
Adjust the detection sensitivity of rear class amplitude variation.
Certainly, detection device, can also be to photosensitive letter before photosensor signal is inputted biasing circuit 11 and delay circuit 12
It number is filtered, the processing such as noise reduction.
Specifically, biasing circuit 11 can be that the photosensor signal received increases bias voltage, i.e., block isolating circuit 15 is passed
The photosensor signal comprising alternating current sent provides a bias voltage, and the voltage value of the bias voltage can be preset in advance
's.In practical applications, the size of bias voltage determines the sensitivity of amplitude measure of the change, and the present invention is not intended to limit biasing
Producing method.In the embodiment of the present invention, what the bias voltage in biasing circuit 11 can directly be generated by power supply, alternatively, also may be used
Vref can be expressed as with the voltage by the electric resistance partial pressure generation in biasing circuit 11, such as in biasing circuit 11.So,
When the voltage of the photosensor signal of input offset voltage is 0V, then the voltage that biasing circuit 11 exports can be bias voltage
Verf, if alternatively, further including divider resistance in biasing circuit 11, the voltage that biasing circuit 11 exports can be less than biased electrical
Pressure.
Certainly, in practical applications, biasing circuit 11 can also include one or more divider resistances, can be used for light
Quick signal is divided.
Delay circuit 12 can postpone photosensor signal, example after the photosensor signal that block isolating circuit 15 inputs is received
The AC signal of photosensor signal can such as be postponed according to predetermined time delay, which can be based on prolonging
It needs to set late, the time of delay, which determines, can be detected signal amplitude variation speed.
In the embodiment of the present invention, delay circuit 12 can include to divider resistance and charging capacitor, include alternating current
Photosensor signal input delay circuit 12 after, by the partial pressure of divider resistance, charging capacitor is filled using the voltage after partial pressure
Electricity realizes delay feature.
In the embodiment of the present invention, comparator, the first input end of comparison circuit 13 and second are included in comparison circuit 13
Input terminal is two input terminals of comparator.Wherein, if first input end is in-phase end (i.e.+), the second input terminal is anti-
To end (i.e. -), if alternatively, first input end is backward end, the second input terminal is in-phase end.
The first input end of comparator is connected with biasing circuit 11, can receive the increase biased electrical of the output of biasing circuit 11
The photosensor signal of pressure；Second input terminal of comparator is connected with delay circuit 12, is postponed with receiving the output of delay circuit 12
Treated photosensor signal.In a comparator, when the voltage for inputting in-phase end is more than or equal to backward end, then comparator output is high
Level, it is on the contrary then export low level.In the embodiment of the present invention, mainly using first input end as "+", the second input terminal is that "-" is
Example illustrates, that is, detects comparison circuit 13 and export positive pulse.
Feedback circuit 14 can be used for feeding back the low and high level that comparison circuit 13 exports, with to delay circuit 12
Delay feature is controlled accordingly.The analog switch that feedback circuit 14 includes can be a list for carrying controllable switch function
First component, it is in parallel with the divider resistance of delay circuit 12, and the input terminal of analog switch and the output terminal of comparison circuit 13 connect
It connects, when the input terminal of analog switch inputs high/low level, controls the conducting and disconnection of analog switch respectively, that is to say, that anti-
In current feed circuit 14 analog switch conducting and disconnect controlled by the level that comparison circuit 13 exports.In practical applications, in reality
It, can also be by having the function of the relay of controllable switch, MOS, three in existing feedback circuit 14 during the switching effect of analog switch
Pole pipe etc. realizes that those skilled in the art can be designed according to actual demand, the embodiment of the present invention is not made this specifically
Limitation.
In the embodiment of the present invention, increase with the voltage of photosensor signal, such as light enhancing, if detecting comparison circuit 13
When exporting high level, then the analog switch in feedback circuit 14 will be switched to conducting state by off-state, enable delay circuit 12
Short circuit is compared at this point, current photosensor signal directly will input comparison circuit 13 by analog switch, i.e., in analog switch
During conducting, the voltage for the photosensor signal for inputting biasing circuit 11 in comparator and the voltage of photosensor signal are directly compared.
With the increase of photosensor signal, the voltage that delay circuit 12 inputs will be greater than in biasing circuit 11 by partial pressure
The voltage of the photosensor signal of reason, the level that comparison circuit 13 exports will be overturn, that is, it is low to detect that comparison circuit 13 exports
Level at this point, the analog switch in feedback circuit 14 will be switched to off-state by conducting state, enables delay circuit 12 keep just
Often work.
In the embodiment of the present invention, the output result of comparison circuit 13 is fed back to by the defeated of analog switch by feedback circuit 14
Enter end, so as to fulfill the control of conducting state and off-state to analog switch, and then realize the delay to delay circuit 12
The control of function, therefore in photosensor signal change procedure, such as when photosensor signal persistently increases, the level that comparison circuit 13 exports
Comparison circuit 13 can be promoted to overturn output level with the delay feature of revertive control delay circuit 12, form a pulse,
Therefore the amplitude of variation of photosensor signal can be calculated by the voltage difference in the counting to pulse and comparator.
The detection process of detection device in embodiment is illustrated the present invention with reference to specific circuit diagram.
In the embodiment of the present invention, mainly carried out so that detection device detects the amplitude of variation of photosensor signal by rising edge as an example
Illustrate, the circuit diagram designed at this time is as shown in Figure 3.
In Fig. 3, the bias voltage that biasing circuit 11 provides is Verf, and divider resistance R1, R2 are further included in biasing circuit 11
And R4, for carrying out voltage division processing to the photosensor signal for increasing bias voltage.Biasing circuit 11 is compared with comparison circuit 13
The "+" of device is connected, and delay circuit 12 is connected with the "-" of comparator in comparison circuit 13, and delay circuit 12 includes divider resistance
(R3) and charging capacitor (C1), wherein R3 is in parallel with the analog switch in feedback circuit 14, the input terminal of feedback circuit 14 with than
Output terminal compared with circuit 13 connects, with the conducting and disconnection of low and high level control analog switch exported by comparing circuit 13.
Multiple voltage detecting points are also labelled in Fig. 3, i.e. totally five test points, corresponding detection voltage are Va, Vb, Vc, Vd to a-e
And Ve, wherein, the "+" of Ve input comparators, the "-" of Vc input comparators.
In practical applications, a points input a photosensor signal (signal i.e. to be measured), which can derive from brightness and sense
The electric signal that photoelectric conversion signal or temperature, pressure etc. later is converted to, just being limited property does not embody here.
In general, when a points detection photosensor signal voltage Va for a long time it is unchanged when, then b points detection light
The voltage of quick signal maintains Vb=Vref* (R1+R2)/(R1+R2+R4).In value, in order to simplify calculate, usual R1 and
R2 is much larger than R4, so b point voltages can be equivalent to Vb=Vref.Meanwhile the e point voltage Ve=Vb*R2/ (R1+R2) of detection
=Vref*R2/ (R1+R2), c point voltage Vc=Vb=Vref, due to the Vc of input comparator at this time>Ve, so comparator is defeated
Go out low level, i.e. Vd is low level.
If the voltage of the photosensor signal of a points detection rises, due to the presence of C2, then b point voltages Vb can follow the change of Va
Change and change, and variable quantity is the same.For example, when b points rise to Vb=Vref* (R1+R2)/R2, Ve also becomes Ve=
Vb*R2/ (R1+R2)=Vref, and Vc is due to the presence of R3 and C1, c points voltage needs are electrically charged after a certain period of time just can be
Variation, and C1 and R3 (R3 and C1 values here can be from 0 to just infinite, to adapt to various detection scenes) value is bigger, variation
The required time is also longer, and meets capacitor charging formula Vc (t)=Vc+ (Vb-Vc) * (1-exp (- t/ (R3*C1))),
Therefore, when R3, C1 value are sufficiently large, within a certain period of time, c point voltages of regarding as that can be equivalent remain unchanged, i.e. Vc=
Vref then has Vc=Ve=Vref, so Vd exports high level.
At this point, due to the presence of analog switch (K1), K1 is controlled by the high level of Vd, makes R3 short-circuit, Vc quick charges, Vc
Become Vc=Vb=Vref* (R1+R2)/R2, Vc is more than Vb, the Vd output low levels of comparator again at this time, and K1 is disconnected.
Continue to rise with the voltage of photosensor signal, Va and Vb continue to increase, when Vb rises to Vb=Vref* (R1+
R2) during ^2/R2^2, then Ve=Vb*R2/ (R1+R2)=Vref* (R1+R2)/R2, and Vc is due to the effect of delay circuit 12,
It is still maintained at laststate, i.e. Vc=Vref* (R1+R2)/R2, then, just there is Ve=Vc at this time, therefore Vd exports high electricity again
Flat, K1 conductings, R3 is short-circuited.And when Vc becomes Vc=Vb=Vref* (R1+R2) ^2/R2^2>During Ve, Vd output levels occur
Overturning, becomes low level, and K1 is disconnected.
The voltage change schematic diagram of each test point is as shown in Figure 4 in the above process.
It can be seen that if the voltage of the photosensor signal of a points input continues to rise, it is increased beyond Vc*R1/R2 every time
(Vc refers to the voltage of current c points detection), can all make d points export pulsatile once signal, then, it can be obtained according to number of pulses
The amplitude of variation of a point signals.
For example, if Vref is set as 1V, R1 and R2 value 10k, R4 values 100, R3 values 1000, C1 values
100uf brings above-mentioned capacitor charging formula Vc (t)=Vc+ (Vb-Vc) * (1-exp (- t/ (R3*C1))) calculating into, it is known that, as long as
Vb paces of change are much smaller than within 23ms, it is possible to be ensured that Vc changes in 23ms less than 5%, that is, be approximately constant.
If when normal, the voltage of the photosensor signal of a points is 0v, and the voltage of the photosensor signal of a points is from 0V saltus steps when abnormal
For 3V, then equivalent b points can change to 4V from 1V, and describe as procedure described above, d points can when b points rise to 2V and 4V,
A pulse is generated respectively, altogether two pulse signals, this is equivalent to the pulse modulated effect of an equal proportion, if a
Point, which continues to rise, then to be needed rising to 7V, i.e. when b point 8V can just generate third pulse.This equal proportion impulsive measurement is more
The rational amplitude of variation for having quantified signal to be measured because amplitude of variation greatly to a certain extent when, if continue using etc. between
Every quantization, a large amount of pulse can be generated, occupies the resource of processing unit.In practical application, when amplitude of variation is big, detection system
Opposite required precision of uniting can also reduce, so the quantization of pulse according to a certain percentage is more reasonable.
In an alternative embodiment of the invention, detection device can also use the amplitude of variation of failing edge detection photosensor signal,
At this point, the corresponding circuit design drawing of detection device is as shown in Figure 5.
It compares for the circuit designed by Fig. 3, the divider resistance in Fig. 5 in biasing circuit 11 can only include R4, delay
A divider resistance R5 can be added in circuit 12, then, under stable situation, Vc=Vb* (R5/ (R3+R5))<Ve.
So, when the voltage Va of the photosensor signal of a points detection is unchanged for a long time, i.e. va=0, Vref are positive voltage,
According to voltage divider principle, Vc=Vb under stable state>Ve.Therefore when realizing failing edge detection, such as several Va decline, then Vb declines, and will
Ve is driven to decline until less than the Vc=Vb* (R5/ (R3+R5)) that previous state is kept, that is, ensure that stable state below-center offset circuit 11 is defeated
Go out and exported to the voltage of comparison circuit 13 more than delay circuit 12 to the voltage of comparison circuit 13, such biasing circuit 11 follows light
During quick signal input real-time change, the output level of comparison circuit 13 can be only caused in the voltage of photosensor signal decline process
It overturns, and then the voltage fall of photosensor signal can be calculated according to the number of pulses that comparison circuit 13 exports.
Embodiment two
As shown in fig. 6, the embodiment of the present invention provides a kind of detection method, above-mentioned detection device, the party can be applied to
Method can be described as follows：
S11：Voltage division processing carries out the photosensor signal of reception by the biasing circuit in detection device respectively, obtains first
It handles signal and delay disposal is carried out to photosensor signal by the delay circuit in detection device, obtain second processing signal.
In the embodiment of the present invention, the circuit structure and operation principle of detection device please refer to earlier figures 2, Fig. 3 and Fig. 5 and phase
It should describe, details are not described herein again.
Specifically, photosensor signal can be that detection device passes through sensor, such as luminance sensor, sound transducer etc.
The photoelectric conversion signal of acquisition.Certainly, which can also be obtained by conversions such as temperature sensor, pressure sensors
Electric signal.
Before S11, it can also be kept away by the block isolating circuit in detection device to the DC current in isolation photosensor signal
Exempt from the DC magnitude in photosensor signal being transmitted to the biasing circuit and delay circuit of rear class, and only the alternating current of photosensor signal
Rear class is streamed to, helps that the detection sensitivity of rear class amplitude variation is adjusted flexibly.
Certainly, in practical applications, photosensor signal is divided and delay disposal before, can also be to photosensitive progress
The processing such as filtering help to improve accuracy when rear class measures.
In the embodiment of the present invention, the first processing signal can be that biasing circuit increases biasing to photosensor signal in detection device
Signal after voltage and partial pressure.Second processing signal can be signal after delay circuit postpones photosensor signal or be
Delay circuit photosensor signal is divided and is postponed after signal.For example, if the delay circuit in detection device includes partial pressure
Resistance and charging capacitor, then, in the case of divider resistance short circuit, second processing signal is the delay letter of photosensor signal
Number, the voltage of the first processing signal is the current voltage of photosensor signal at this time, if divider resistance is not short-circuit, second processing letter
Number be photosensor signal partial pressure and delay after signal, voltage be divide after signal, usually less than photosensor signal is current
Voltage.
S12：By the comparator comparison voltage size of the first processing signal and second processing signal input detection device.
In the embodiment of the present invention, after detection device by first by handling signal and second processing signal input comparator,
The voltage swing of the two can be compared, and high/low level is exported according to comparison result.In the embodiment of the present invention, mainly
With the in-phase end (+) of the first processing signal input comparator, for the backward end (-) of second processing signal input comparator, then
When the voltage of the first processing signal is more than the voltage of second processing signal, then comparator exports high level, anyway, then it exports low
Level.
S13：If it is determined that comparator exports high level, then control in parallel with the divider resistance of delay circuit in detection device
Analog switch is connected, and with short-circuit divider resistance, and photosensor signal is directly inputted comparator by circuit where analog switch, and
When determining that comparator exports low level, analog switch is disconnected, delay circuit is enabled to keep normal work.
In the embodiment of the present invention, with the variation of photosensor signal, if detection device determines that comparator exports high level, by
The analog switch of the high level control of comparator turns on, so as to carry out short circuit to the divider resistance in delay circuit, so that light
Quick signal can directly input comparator by analog switch, i.e. the voltage of second processing signal is the current electricity of photosensor signal
Pressure usually, is more than into first crossed after dividing and handles the voltage of signal, therefore the output level of comparator can be promoted to occur
Overturning exports low level, at this point, the low level of comparator output will control analog switch to disconnect, delay circuit restores normal work
Make.
Therefore, in photosensor signal change procedure, pass through the level pair and deferred telegram for exporting comparator in detection device
The control of the analog switch of divider resistance parallel connection in road can promote the level that comparator exports to overturn, that is, form one
Pulse helps to detect the situation of change of photosensor signal.
In the embodiment of the present invention, after S13, the low and high level that can be exported according to comparator in the preset time of record
The number of pulses formed, the preset time can be related to the delay time of delay circuit.So, detection device is according to pulse
Quantity and biasing difference, it may be determined that voltage variety of the photosensor signal in the preset time, the biasing difference are at first
Manage the voltage difference between the first voltage of signal and the second voltage of second processing signal.
In specific measurement process, detection device can be come true by detecting the rising edge or failing edge of photosensor signal
Determine the amplitude of variation of photosensor signal, specific detection and calculating process refer to Fig. 3-Fig. 5 and associated description, no longer superfluous herein
It states.
In the embodiment of the present invention, since the amplitude of variation for detecting signal can be quantified as the pulse of output by detection device
(corresponding low and high level), therefore be directly to be realized by the quantity of recording impulse in the amplitude of variation for calculating photosensor signal,
Greatly save power consumption and resource.
Embodiment three
As shown in fig. 7, based on same inventive concept, the embodiment of the present invention also provides a kind of detection device, including obtaining mould
Block 21, input module 22 and control module 23.
Acquisition module 21 can be used for dividing the photosensor signal of reception respectively by the biasing circuit in detection device
Pressure processing obtains the first processing signal and the photosensor signal is prolonged by the delay circuit in parallel with the biasing circuit
Processing late obtains second processing signal；
Described first processing signal and the second processing signal are inputted the comparison of the detection device by input module 22
Device comparison voltage size；
Control module 23, for if it is determined that comparator output high level, controls in the detection device and prolong with described
The analog switch conducting of the divider resistance parallel connection of slow circuit, with the short circuit divider resistance, and passes through institute by the photosensor signal
It states circuit where analog switch and directly inputs the comparator or if it is determined that when the comparator exports low level, described in disconnection
Analog switch enables the delay circuit keep normal work.
Optionally, detection module can also include isolation module, for being docked by the biasing circuit in detection device
Before the photosensor signal of receipts carries out voltage division processing respectively, by the block isolating circuit in the detection device to the photosensitive letter is isolated
DC current in number.
Optionally, the detection device further includes logging modle and determining module.
Wherein, the pulse that logging modle can be formed in the low and high level that the comparator exports in record preset time
Quantity.
Determining module can be used for, according to the number of pulses and biasing difference, determining the photosensor signal described default
Voltage variety in time；Wherein, at first voltage and described second of the biasing difference for the described first processing signal
Manage the voltage difference between the second voltage of signal.
Example IV
A kind of computer installation is also provided in the embodiment of the present invention, structure is as shown in figure 8, the computer installation includes place
Device 31 and memory 32 are managed, wherein, the present invention is realized when processor 31 is for performing the computer program stored in memory 32
The step of data processing method provided in embodiment one.
Optionally, processor 31 can be specifically central processing unit, application-specific integrated circuit (Application
Specific Integrated Circuit, ASIC), can be one or more integrated circuits for program to be controlled to perform,
Can be the hardware circuit of use site programmable gate array (Field Programmable Gate Array, FPGA) exploitation,
It can be baseband processor.
Optionally, processor 31 can include at least one process cores.
Optionally, electronic equipment further includes memory 32, and memory 32 can include read-only memory (Read Only
Memory, ROM), random access memory (Random Access Memory, RAM) and magnetic disk storage.Memory 32 is used for
Store data required when processor 31 is run.The quantity of memory 32 is one or more.
Embodiment five
A kind of computer readable storage medium is also provided in the embodiment of the present invention, which has
Computer instruction can realize that the present invention such as implements the data of an example offer when computer instruction instruction is run on computers
The step of processing method.
In embodiments of the present invention, it should be understood that disclosed data processing method and data processing equipment can pass through
Other modes are realized.For example, apparatus embodiments described above are only schematical, for example, the division of unit, only
For a kind of division of logic function, there can be other dividing mode in actual implementation, such as multiple units or component can combine
Or it is desirably integrated into another system or some features can be ignored or does not perform.Another point, shown or discussed phase
Coupling, direct-coupling or communication connection between mutually can be by some interfaces, the INDIRECT COUPLING or communication of equipment or unit
Connection, can be electrical or other forms.
Each functional unit in embodiments of the present invention can be integrated in a processing unit or each unit also may be used
To be independent physical module.
If integrated unit realized in the form of SFU software functional unit and be independent product sale or in use, can
To be stored in a computer read/write memory medium.Based on such understanding, the technical solution of the embodiment of the present invention it is complete
Portion or part can be embodied in the form of software product, which is stored in a storage medium, packet
It includes some instructions to use so that a computer equipment, such as can be personal computer, server or the network equipment etc.,
Or processor (Processor) performs all or part of step of the method for each embodiment of the present invention.And aforementioned storage is situated between
Matter includes：It is general serial bus USB (Universal Serial Bus flash drive, USB), mobile hard disk, read-only
Memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disc or
The various media that can store program code such as person's CD.
Above example is only used for that technical scheme of the present invention is described in detail, but the explanation of above example is only
It is the method for being used to help understand the embodiment of the present invention, should not be construed as the limitation to the embodiment of the present invention.The art
The change or replacement that technical staff can readily occur in should all be covered within the protection domain of the embodiment of the present invention.
Claims (12)
1. a kind of detection device, which is characterized in that including：
Biasing circuit, for adding bias voltage to the photosensor signal of reception；
Delay circuit, including divider resistance and charging capacitor, the divider resistance is for dividing the photosensor signal, institute
Charging capacitor is stated for carrying out delay disposal to the photosensor signal；
Comparison circuit, including first input end and the second input terminal, the first input end is connected with the biasing circuit, described
Second input terminal is connected with the delay circuit, for the first input end and the electricity of the second input terminal received signal
Size is pressed, and high level or low level are exported according to comparison result；
Feedback circuit, including an analog switch, the analog switch is in parallel with the divider resistance in the delay circuit, and described
The input terminal of analog switch is connect with the output terminal of the comparison circuit, and the feedback circuit is used for the output according to comparison circuit
Level controls the analog switch to switch between off-state and conducting state；
Wherein, when detecting the comparison circuit output high level, the analog switch is switched to conducting shape by off-state
State enables the short circuit of the divider resistance in the delay circuit and when detecting the comparison circuit output low level, the simulation
Switch is switched to off-state by the conducting state, and the delay circuit is enabled to keep normal work.
2. device as described in claim 1, which is characterized in that the detection device further includes：
Block isolating circuit is connect respectively with the biasing circuit and the delay circuit, straight in the photosensor signal for being isolated
Galvanic electricity stream, and the photosensor signal after isolated DC electric current is respectively transmitted to the biasing circuit and the delay circuit.
3. device as claimed in claim 2, which is characterized in that when the analog switch is in the conduction state, the delay
Divider resistance short circuit in circuit, the charging capacitor are charged using the voltage of the photosensor signal.
4. device as claimed in claim 3, which is characterized in that when the analog switch is off, described first
The branch pressure voltage that the voltage of input terminal is generated for the photosensor signal after the biasing circuit, the voltage of second input terminal
The delay voltage generated after the delay circuit for the photosensor signal.
5. a kind of detection method, which is characterized in that including：
Voltage division processing carries out the photosensor signal of reception by the biasing circuit in detection device respectively, obtains the first processing letter
Number and by the delay circuit in the detection device to the photosensor signal carry out delay disposal, obtain second processing signal；
Described first processing signal and the second processing signal are inputted to the comparator comparison voltage size of the detection device；
If it is determined that comparator output high level, then control in the detection device with the divider resistance of the delay circuit simultaneously
The photosensor signal with the short circuit divider resistance, and is passed through circuit where the analog switch by the analog switch conducting of connection
When directly inputting the comparator, and determining the comparator output low level, the analog switch is disconnected, enables the deferred telegram
Road keeps normal work.
6. method as claimed in claim 5, which is characterized in that by the biasing circuit in detection device to the photosensitive of reception
Before signal carries out voltage division processing respectively, further comprise：
By the block isolating circuit in the detection device to the DC current in the photosensor signal is isolated.
7. such as method described in claim 5 or 6, which is characterized in that further comprise：
The number of pulses that the low and high level of the comparator output is formed in record preset time；
According to the number of pulses and biasing difference, voltage variety of the photosensor signal in the preset time is determined；
Wherein, the biasing difference is between the first voltage of the described first processing signal and the second voltage of the second processing signal
Voltage difference.
8. a kind of detection device, which is characterized in that including：
Acquisition module carries out voltage division processing to the photosensor signal of reception for passing through the biasing circuit in detection device, obtains respectively
It obtains the first processing signal and delay disposal is carried out to the photosensor signal by the delay circuit in the detection device, obtain
Second processing signal；
Input module, the comparator that the described first processing signal and the second processing signal are inputted to the detection device compare
Voltage swing；
Control module, for if it is determined that the comparator export high level, control in the detection device with the delay circuit
Divider resistance parallel connection analog switch conducting, with the short circuit divider resistance, and the photosensor signal is passed through into the simulation
Circuit where switch directly inputs the comparator or if it is determined that when the comparator exports low level, disconnects the simulation and opens
It closes, the delay circuit is enabled to keep normal work.
9. device as claimed in claim 8, which is characterized in that the detection device further includes：
Isolation module, for the photosensor signal of reception is carried out respectively by the biasing circuit in detection device voltage division processing it
Before, by the block isolating circuit in the detection device to the DC current in the photosensor signal is isolated.
10. device as claimed in claim 8 or 9, which is characterized in that the detection device further includes：
Logging modle, the number of pulses that the low and high level for recording the comparator output in preset time is formed；
Determining module, for according to the number of pulses and biasing difference, determining the photosensor signal in the preset time
Voltage variety；Wherein, first voltage and the second processing signal of the biasing difference for the described first processing signal
Second voltage between voltage difference.
11. a kind of computer installation, which is characterized in that the computer installation includes processor, and the processor is used to perform
It is realized during the computer program stored in memory such as any claim the method in claim 5-7.
12. a kind of computer readable storage medium, which is characterized in that the computer-readable recording medium storage has computer to refer to
It enables, when described instruction is run on computers so that computer performs the side as described in claim any in claim 5-7
Method.
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