CN109557349A - A kind of osc optical signal reception device calculated for precision - Google Patents
A kind of osc optical signal reception device calculated for precision Download PDFInfo
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- CN109557349A CN109557349A CN201811622913.1A CN201811622913A CN109557349A CN 109557349 A CN109557349 A CN 109557349A CN 201811622913 A CN201811622913 A CN 201811622913A CN 109557349 A CN109557349 A CN 109557349A
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Abstract
The present invention discloses a kind of osc optical signal reception device calculated for precision, including receives shell and optical signal reception head, further includes first circuit board, second circuit board and tertiary circuit plate；The first circuit board, second circuit board and tertiary circuit plate are mounted on by buckle and are received in shell, optical signal receives head and is mounted on one end center line for receiving shell, first circuit board is mounted on the rear that optical signal receives head, tertiary circuit plate is mounted on the tail portion for receiving shell, first circuit board, second circuit board and tertiary circuit plate are connected in turn by the power supply line in circuit board mounting blocks, and circuit board mounting blocks are installed by receiving the groove of interior of shell；The present invention cooperates anti-interference and second order the filter circuit of Dolby circuit to be transferred to faint optical signal in oscillograph after screening, realizes the purpose closely detected by the input pattern of the photodiode of guided optical mode.
Description
Technical field
The present invention relates to the technical field that precision calculates, a kind of particularly reception device of optical signal, more particularly
A kind of osc optical signal reception device calculated for precision.
Background technique
Oscillograph is for showing on a display screen electric signal in the form of just profound wave, and it is enough clear accurate to allow the viewer to
Judgement received electric signal wave band length, to judge the property of signal, optical signal can pass through photodiode
Conversion converts optical signals into electric signal, to also show wave band in oscillograph remittance, obtains to the accurate of sightless light source
Capture, especially under conditions of light source is weaker, the power of the receptions ability of optical signal directly determine the precision of oscillograph with
The accuracy of calculating.
Signal received by photodetector be usually quite it is faint, and optical detector output signal often by depth
It is embedded among noise, therefore, such small-signal is handled, generally will first be pre-processed, it will be most of
Noise filtering falls, and small-signal is amplified to voltage amplitude required by subsequent processor.In this way, it is necessary to pass through preceding storing
Big circuit, filter circuit and main amplifying circuit carry out output amplitude properly and have filtered out the signal to be detected of most of noise.
Currently, generalling use the form of the reception processing of the optical signal of photovoltaic mode, light signal receiving be can not achieve
Being switched fast under varying environment, the amplification for small-signal are also to have fixed ratio to measure, and this mode is significantly
The variable operation and reception limited in dim environment, therefore, the reception device for how improving optical signal makes it have
It is switched fast adaptation under a variety of varying environments, different microwave optical signals is received by resistance ratio amplification and adjusts received light letter
Number precision, and the ratio amplified is adjustable to find most suitable receiving wave range, realizes that accurate calculate is institute of the present invention
It solves the problems, such as.
Summary of the invention
In order to overcome above-mentioned technical problem, the purpose of the present invention is to provide a kind of optical signals calculated for precision to show
Wave device reception device, the present invention include following technical characteristic:
(1) adjustable resistance ratio button；
(2) optical signal of the guided optical mode of double-sided PCB receives and signal amplifies；
(3) second-order filter circuit plate；
(4) noise reduction anti-jamming circuit；
The reception device for improving optical signal makes it have the adaptation that is switched fast under a variety of varying environments, receives different micro-
Wave optical signal adjusts the precision of received optical signal by resistance ratio amplification, and the ratio amplified is adjustable is most closed with finding
Suitable receiving wave range realizes the accurate purpose calculated.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of osc optical signal reception device calculated for precision, including shell and optical signal reception head are received, also
Including first circuit board, second circuit board and tertiary circuit plate；The first circuit board, second circuit board and tertiary circuit plate are logical
It crosses buckle to be mounted in reception shell, optical signal receives head and is mounted on one end center line for receiving shell, first circuit board peace
Mounted in optical signal receive head rear, tertiary circuit plate be mounted on receive shell tail portion, first circuit board, second circuit board and
Tertiary circuit plate is connected in turn by the power supply line in circuit board mounting blocks, and circuit board mounting blocks are by receiving the recessed of interior of shell
Slot installation；
Wherein, the first circuit board is equipped with photodiode, first circuit board towards the side that optical signal receives head
The other side is equipped with amplifying circuit device, and photodiode one end is connected in external power supply negative pressure, photodiode other end peace
On the cathode of amplifying circuit device, amplifying circuit device plus earth, 32 output end of amplifying circuit device is linked into second circuit board
On；
Noise reduction interference circuit is connected on the circuit of the photodiode, photodiode both ends are connected to output circuit
On, photodiode is parallel with Current Tracing device, leakage current tracker, parasitic capacitance and dead resistance, four of noisy power
Parallel branch, wherein Current Tracing device be the nearest branch of photodiode, dead resistance and the concatenated branch of noisy power away from
Farthest from photodiode, leakage current tracker and parasitic capacitance are two intermediate parallel circuits, and parasitic capacitance is close to parasitic
Resistance side, photodiode noise reduction interference circuit main road on be connected with series resistance on the outside of four parallel branches；
The amplifying circuit device circuit is the amplifying circuit under guided optical mode, and the positive terminal of noise reduction interference circuit, which is connected to, to be put
The anode of big circuit device, side is linked into input voltage Ui mono- by amplification resistance A on the positive terminal main road of noise reduction interference circuit
End, the output end that the other side is linked into amplifying circuit device by amplifying resistance C, amplification resistance C are feedback resistance, noise reduction interference electricity
The negative pole end on road is connected to the cathode of amplifying circuit device and by amplification resistance B ground connection.
As a further solution of the present invention, the reception cover top portion is provided with dial, and dial is logical
It overregulates amplification resistance B and amplifies the ratio discharge circuit electric current of resistance A, the setting of shell tailstock connects in reception shell with optical signal
The opposite one end of head is received, signal output is provided among shell tailstock, signal output is electric by the circuit of amplification by conducting wire
Stream signal is output to the display end of oscillograph, and the side for receiving shell is provided with power supply insert port, and power supply insert port passes through conducting wire
External power supply is provided to light signal receiving.
As a further solution of the present invention, it is spherical convex lens structure that the optical signal, which receives head, and optical signal receives head
Center is reception one end of photodiode, and optical signal receives head and is mounted on optical signal transmission band, optical signal transmission band
It is connected on the circuit of noise reduction interference.
As a further solution of the present invention, the second A/D converter, amplifying circuit device are installed on the second circuit board
Output end is connected to the second A/D converter positive terminal, second resistance A and second resistance B by second resistance A and second resistance B
Between lead-out wire the output end of the second A/D converter is connected to by the second capacitor A, the second A/D converter cathode passes through second
Second capacitor B is connected to the anode of the second A/D converter by resistance C ground connection, the conducting wire that second resistance C45 is grounded one end, and second
A/D converter cathode is connected to the second A/D converter output end by second resistance D.
As a further solution of the present invention, third A/D converter is installed, the 2nd A/D turns on the tertiary circuit plate
Parallel operation output end is connected to the anode of third A/D converter, third capacitor A and third electricity by third capacitor A and third capacitor B
Hold the lead connected between B and third A/D converter output end is connected to by 3rd resistor B, third A/D converter passes through third
Resistance C ground connection, 3rd resistor C ground terminal are connected between third capacitor A and third capacitor B by 3rd resistor A, the 3rd A/D
Converter cathode is connected to third A/D converter output end by the 4th resistance D.
As a further solution of the present invention, the second resistance D is the feedback resistance of the second A/D converter cathode, the
Two capacitor A are the feedback capacities of the second A/D converter anode.
As a further solution of the present invention, the 3rd resistor B is the feedback resistance of third A/D converter anode, the
Four resistance D are the feedback resistances of third A/D converter cathode.
The working method of the osc optical signal reception device calculated for precision, comprising the following steps:
It receives one end of shell Step 1: optical signal reception head is mounted on and is connected on optical signal transmission band, light
Photodiode, first circuit board, second circuit board and the tertiary circuit at photodiode rear are installed in signal transmission belt
Plate is sequentially arranged at reception interior of shell, and signal output is connected in oscillograph circuit, and outer by the input of power supply insert port
Portion's power supply；
Step 2: optical signal reception head is placed in faint light source spot, light wave and noise waves are mixedly appeared in optical signal
It receives in head, the noise reduction interference circuit of photodiode issues electric current, photoelectricity by the radiant light excitation current source of noisy power
The both ends that diode has a reverse bias voltage reversely to increase to photodiode, at this point, the value of parasitic capacitance is significantly
Reduce, the electric current of leakage current tracker increases, and being switched fast for photoelectric sensor circuit is realized in being widely varied for parasitic capacitance value
With respond rapidly to；
Step 3: the optical signal of primary filtration is transferred in the amplifying circuit of amplifying circuit device in step 2, pass through adjusting
Control panel adjusts amplification resistance B and amplifies the ratio of resistance A, to be adjusted to most close in the environment of unknown light signal strength
Suitable amplification factor；
Step 4: the optical signal in step 3 is transferred to the two of low-pass filter circuit and high-pass filtering circuit after amplification
In rank filter circuit, the lower-cut-off frequency of low-pass filter circuit is f1, and the upper cut-off frequency of high-pass filtering circuit is f2, into
Frequency bandwidth after crossing second-order filter are as follows: B=f2-f1, lower-cut-off frequency is f1 and upper cut-off frequency is f2 respectively by public affairs
Formula calculates, according to precision it needs to be determined that numerical value；
Step 5: the electric signal in step 4 by second order filtering is input in oscillograph by signal output, oscillography
Device is shown the received optical signal of reception device display screen in the form of waveform, and obtains the specific wave of shown waveform
Section.
Beneficial effects of the present invention:
1, the osc optical signal reception device for being used for accurate calculating passes through public affairs by amplification resistance B and amplification resistance A
FormulaRatio determine that amplification factor is A=l+R323/R321 in formula, wherein R323 is feedback
Resistance.For the normal work of subsequent conditioning circuit, when design, needs to set reasonable R323 and R321 value, to obtain required amplitude
Output voltage, it is defeated that optical signal by the absorption that optical signal receives head by photodiode is converted to electric signal by faint optical signal
Enter into amplifying circuit, the amplification factor of amplifying circuit is adjusted by dial at least amplifies 500 times, highest amplification 5,000
Times, required wave band is obtained by filtration in the electric signal of amplification.
2, noise reduction interference circuit passes through the rapid variation of capacity of the parasitic capacitance in parallel branch, enables the reception device
It adapts under different dim environment and noisy environment, passes through the significant change of Current Tracing device and the electric current of electric leakage tracker circuit
Ratio distinguish low-light and noise band signal, this ratio variation less in the case where approximate line style, become in parasitic capacitance
Change for non-linearity in biggish situation, the variation of line style is for stable measurement low level light signal, and the variation of non-linearity is for fast
Speed response periphery light environment；Photodiode in light guide approach then has a reverse bias voltage to add to light sensing element
Both ends.When this voltage adds to light detecting device, the width of depletion layer be will increase, so that parasitic capacitance be dramatically reduced
Value.
3, to keep circuit design succinct and there is good signal-to-noise ratio, when design also need with bandpass filter to signal into
Row processing.For the accuracy for guaranteeing measurement, the design adds people's second order bandwidth-limited circuit after pre-amplification circuit, to remove
Noise other than useful signal frequency band, including ambient noise and the noise to be induced one by preamplifier, the active band logical of use is filtered
Wave device can gate the signal in a certain frequency range, and inhibit the signal other than the frequency range, the second A/D converter and the 3rd A/D conversion
Device is all amplifier, and operational amplifier has the open-loop gain and good stability that defeated people's impedance is high, output impedance is low, high,
And constitute simple and function admirable.
4, the present invention cooperates the anti-interference of Dolby circuit by the input pattern of the photodiode of guided optical mode, and
Faint optical signal is transferred in oscillograph by the filter circuit of second order after screening, realizes the purpose closely detected.
Detailed description of the invention
The present invention will be further described below with reference to the drawings.
Fig. 1 is overall structure of the present invention.
Fig. 2 is reception interior of shell structure three-dimensional schematic diagram in the present invention.
Fig. 3 is first circuit board structure scheme of installation in the present invention.
Fig. 4 is second circuit board structure scheme of installation in the present invention.
Fig. 5 is the hardened structure scheme of installation of tertiary circuit in the present invention.
Fig. 6 is integrated circuit figure in the present invention.
Fig. 7 is that noise reduction interferes circuit diagram in the present invention.
Appended drawing reference: 1, shell is received；11, dial；12, shell tailstock；121, signal output；13, power supply
Insert port；14, circuit board mounting blocks；2, optical signal receives head；21, optical signal transmission band；3, first circuit board；31, photoelectricity two
Pole pipe；311, Current Tracing device；312, leakage current tracker；313, parasitic capacitance；314, dead resistance；315, noise source；
316, series resistance；32, amplifying circuit device；321, amplify resistance A；322, amplify resistance B；323, amplify resistance C；4, the second electricity
Road plate；41, the second A/D converter；42, second resistance A；43, the second capacitor A；44, second resistance B；45, second resistance C；46,
Second capacitor B；47, second resistance D；5, tertiary circuit plate；51, third A/D converter；52, third capacitor A；53, third capacitor
B；54,3rd resistor A；55,3rd resistor B；56,3rd resistor C；57, the 4th resistance D.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described,
Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, all other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the scope of protection of the invention.
It please referring to shown in Fig. 1-Fig. 7, the present invention is a kind of osc optical signal reception device calculated for precision, including
It receives shell 1 and optical signal receives head 2, further include first circuit board 3, second circuit board 4 and tertiary circuit plate 5；Described first
Circuit board 3, second circuit board 4 and tertiary circuit plate 5 are mounted on by buckle and are received in shell 1, and optical signal receives head 2 and is mounted on
On one end center line for receiving shell 1, first circuit board 3 is mounted on the rear that optical signal receives head 2, and tertiary circuit plate 5 is installed
In the tail portion for receiving shell 1, first circuit board 3, second circuit board 4 and tertiary circuit plate 5 pass through in circuit board mounting blocks 14
Power supply line connects in turn, and circuit board mounting blocks 14 are by receiving the groove installation inside shell 1；
Wherein, the first circuit board 3 is equipped with photodiode 31, the first electricity towards the side that optical signal receives head 2
Plate 3 other side in road is equipped with amplifying circuit device 32, and 31 one end of photodiode is connected in external power supply negative pressure, photodiode
31 other ends are mounted on the cathode of amplifying circuit device 32,32 plus earth of amplifying circuit device, the output termination of amplifying circuit device 32
Enter onto second circuit board 4；
Noise reduction interference circuit is connected on the circuit of the photodiode 31,31 both ends of photodiode are connected to output
On circuit, photodiode 31 is parallel with Current Tracing device 311, leakage current tracker 312, parasitic capacitance 313 and dead resistance
314, four parallel branches of noisy power 316, wherein Current Tracing device 311 is the nearest branch of photodiode 31, parasitic
Resistance 314 and the concatenated branch of noisy power 316 are farthest apart from photodiode 31, leakage current tracker 312 and parasitic capacitance
313 be two intermediate parallel circuits, and parasitic capacitance 313 is interfered close to 314 side of dead resistance, the noise reduction of photodiode 31
Series resistance 316 is connected on the outside of four parallel branches on the main road of circuit；Noise reduction interference circuit is existed by parasitic capacitance
The rapid variation of capacity in parallel branch makes the reception device adapt to pass through under different dim environment and noisy environment
The ratio of the significant change of the electric current of Current Tracing device and electric leakage tracker circuit distinguishes low-light and noise band signal, this ratio
Value approximate line style in the case where variation is little is non-linearity, the variation of line style in the biggish situation of parasitic capacitor variations
For stable measurement low level light signal, the variation of non-linearity is used for quick response periphery light environment；Photoelectricity in light guide approach
The both ends that diode then has a reverse bias voltage to add to light sensing element.When this voltage adds to light detecting device, exhaust
The width of layer will increase, so that the value of parasitic capacitance be dramatically reduced.
32 circuit of amplifying circuit device is the amplifying circuit under guided optical mode, and the positive terminal of noise reduction interference circuit is connected to
The anode of amplifying circuit device 32, by amplifying resistance A321, to be linked into input electric for side on the positive terminal main road of noise reduction interference circuit
The one end Ui, the output end that the other side is linked into amplifying circuit device 32 by amplifying resistance C323 are pressed, amplification resistance C323 is feedback
Resistance, the negative pole end of noise reduction interference circuit are connected to the cathode of amplifying circuit device 32 and by amplification resistance B322 ground connection；Amplification
Resistance B322 and amplification resistance A321 pass through formulaRatio determine, A be amplifying circuit device 32
Amplification factor；According to the value range of the calculating of formula and the resistance value of actual loss amplification resistance A321 in 5-15 Ω, put
The value range of big resistance B322 amplifies the value range of resistance C323 in 50-150 Ω in 300-400K Ω.
Preferably, dial 11 is provided at the top of the reception shell 1, dial 11 is by adjusting amplification electricity
It hinders B322 and amplifies the ratio discharge circuit electric current of resistance A321, the setting of shell tailstock 12 is received in reception shell 1 and optical signal
First 2 opposite one end, are provided with signal output 121 among shell tailstock 12, and signal output 121 is by conducting wire by amplification
Circuit current signal is output to the display end of oscillograph, and the side for receiving shell 1 is provided with power supply insert port 13, power supply insert port
13 provide external power supply to light signal receiving by conducting wire.
Preferably, it is spherical convex lens structure that the optical signal, which receives head 2, and it is photoelectricity that optical signal, which receives 2 center of head,
Reception one end of diode 31, optical signal receive head 2 and are mounted on optical signal transmission band 21, and optical signal transmission band 21 is connected to drop
It makes an uproar on the circuit of interference.
Preferably, the second A/D converter 41 is installed, 32 output end of amplifying circuit device passes through on the second circuit board 4
Second resistance A42 and second resistance B44 is connected to 41 positive terminal of the second A/D converter, second resistance A42 and second resistance B44
Between lead-out wire the output end of the second A/D converter 41 is connected to by the second capacitor A43,41 cathode of the second A/D converter is logical
Second resistance C45 ground connection is crossed, the second capacitor B46 is connected to the second A/D converter 41 by the conducting wire that second resistance C45 is grounded one end
Anode, 41 cathode of the second A/D converter is connected to 41 output end of the second A/D converter by second resistance D47；Described second
Circuit board 4 is used as low-pass first order filter, low-pass cut-off frequencies f1, and transmission function isIn formula,It is calculated according to formula and practical
The value range that the loss of energy obtains second resistance A42 is 1.6-1.8K Ω, and the value range of second resistance B44 is 3-3.3K
Ω, second resistance C45 value range are 9-10K Ω, and second resistance D47 value range is 9-10K Ω, and the second capacitor A43's takes
Value range is 110-120pF, and the value range of the second capacitor B46 is 110-120pF.
Preferably, third A/D converter 51 is installed, 41 output end of the second A/D converter is logical on the tertiary circuit plate 5
It crosses third capacitor A52 and third capacitor B53 is connected to the anode of third A/D converter 51, third capacitor A52 and third capacitor
The lead connected between B53 is connected to 51 output end of third A/D converter by 3rd resistor B55, and third A/D converter 51 is logical
3rd resistor C56 ground connection is crossed, 3rd resistor C56 ground terminal is connected to third capacitor A52 and third capacitor by 3rd resistor A54
Between B53,51 cathode of third A/D converter is connected to 51 output end of third A/D converter by the 4th resistance D57；Described
Three-circuit plate 5 is used as bivalent high-pass filter, high pass cut off frequency f2, and transmission function isFormula
In,It is calculated according to formula and actual energy is lost
Value range to third capacitor A52 is 90-100pF, and the value range of third capacitor B53 is 90-100pF, and third is electric
When appearance A52 is identical with the value of third capacitor B53, effect is best, and the value range of 3rd resistor A54 is 9.8-10.2K Ω, third
The value range of resistance B55 is 28-30K Ω, and the value range of 3rd resistor C56 is 14-15K Ω, the value of 3rd resistor D57
Range is 38-40K Ω.
Preferably, the second resistance D47 is the feedback resistance of 41 cathode of the second A/D converter, and the second capacitor A43 is
The feedback capacity of two A/D converters, 41 anode.
Preferably, the 3rd resistor B55 is the feedback resistance of the anode of third A/D converter 51, and the 4th resistance D57 is the
The feedback resistance of three A/D converters, 51 cathode.
Preferably, the dial 11 is amplified in resistance B322 and amplification resistance A321 by different button contacts
Different location realize the variation of ratio, amplification resistance B322 and amplify resistance A321 and realized by the touching of the point in stage and adjust control
The connection of disk 11 processed.
The working method of the osc optical signal reception device calculated for precision, comprising the following steps:
It receives one end of shell 1 Step 1: optical signal reception head 2 is mounted on and is connected to optical signal transmission band 21
On, photodiode 31, first circuit board 3, the second circuit at 31 rear of photodiode are installed on optical signal transmission band 21
Plate 4 and tertiary circuit plate 5, which are sequentially arranged at, to be received inside shell 1, and signal output 121 is connected in oscillograph circuit, and is led to
It crosses power supply insert port 13 and inputs external power supply；
Step 2: optical signal reception head 2 is placed in faint light source spot, light wave and noise waves are mixedly appeared in optical signal
It receives in head 2, the noise reduction interference circuit of photodiode 31 issues electricity by the radiant light excitation current source of noisy power 316
Stream, the both ends that photodiode 31 has a reverse bias voltage reversely to increase to photodiode 31, at this point, parasitic capacitance
313 value significantly reduces, and the electric current of leakage current tracker 312 increases, and realization light is widely varied in 313 value of parasitic capacitance
Electric induction circuit being switched fast and responding rapidly to；
Step 3: the optical signal of primary filtration is transferred in the amplifying circuit of amplifying circuit device 32 in step 2, pass through tune
It saves control panel 11 to adjust amplification resistance B322 and amplify the ratio of resistance A321, thus in the environment of unknown light signal strength
It is adjusted to most suitable amplification factor；
Step 4: the optical signal in step 3 is transferred to the two of low-pass filter circuit and high-pass filtering circuit after amplification
In rank filter circuit, the lower-cut-off frequency of low-pass filter circuit is f1, and the upper cut-off frequency of high-pass filtering circuit is f2, into
Frequency bandwidth after crossing second-order filter are as follows: B=f2-f1, lower-cut-off frequency is f1 and upper cut-off frequency is f2 respectively by public affairs
Formula calculates, according to precision it needs to be determined that numerical value；
Step 5: the electric signal in step 4 by second order filtering is input in oscillograph by signal output 121, show
Wave device is shown the received optical signal of reception device display screen in the form of waveform, and obtains the specific of shown waveform
Wave band.To keep circuit design succinct and having good signal-to-noise ratio, when design, also needs with bandpass filter to signal
Reason.For the accuracy for guaranteeing measurement, the design adds people's second order bandwidth-limited circuit after pre-amplification circuit, useful to remove
Noise other than signal band, including ambient noise and the noise to be induced one by preamplifier, the active band-pass filter of use
The signal in a certain frequency range can be gated, and inhibits the signal other than the frequency range, the second A/D converter and third A/D converter are all
It is amplifier, operational amplifier has the open-loop gain and good stability that defeated people's impedance is high, output impedance is low, high, and structure
At simple and function admirable.
In the description of this specification, the description of reference term " one embodiment ", " example ", " specific example " etc. means
Particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one implementation of the invention
In example or example.In the present specification, schematic expression of the above terms may not refer to the same embodiment or example.
Moreover, particular features, structures, materials, or characteristics described can be in any one or more of the embodiments or examples to close
Suitable mode combines.
Above content is only to structure of the invention example and explanation, affiliated those skilled in the art couple
Described specific embodiment does various modifications or additions or is substituted in a similar manner, without departing from invention
Structure or beyond the scope defined by this claim, is within the scope of protection of the invention.
Claims (8)
1. a kind of osc optical signal reception device calculated for precision, including receive shell (1) and optical signal reception head
(2), which is characterized in that further include first circuit board (3), second circuit board (4) and tertiary circuit plate (5)；First circuit
Plate (3), second circuit board (4) and tertiary circuit plate (5) are mounted on by buckle and are received in shell (1), and optical signal receives head (2)
It is mounted on one end center line for receiving shell (1), first circuit board (3) is mounted on the rear that optical signal receives head (2), third
Circuit board (5) is mounted on the tail portion for receiving shell (1), and first circuit board (3), second circuit board (4) and tertiary circuit plate (5) are logical
Power supply line in oversampling circuit plate mounting blocks (14) connects in turn, and circuit board mounting blocks (14) are by receiving the recessed of shell (1) inside
Slot installation；
Wherein, the first circuit board (3) is equipped with photodiode (31) towards the side that optical signal receives head (2), and first
Circuit board (3) other side is equipped with amplifying circuit device (32), and photodiode (31) one end is connected in external power supply negative pressure, light
Electric diode (31) other end is mounted on the cathode of amplifying circuit device (32), amplifying circuit device (32) plus earth, amplification electricity
Road device (32) output end is linked on second circuit board (4)；
Noise reduction interference circuit is connected on the circuit of the photodiode (31), photodiode (31) both ends are connected to output
On circuit, photodiode (31) be parallel with Current Tracing device (311), leakage current tracker (312), parasitic capacitance (313) and
Dead resistance (314), four parallel branches of noisy power (316), wherein Current Tracing device (311) is photodiode
(31) nearest branch, dead resistance (314) and noisy power (316) concatenated branch apart from photodiode (31) farthest,
Leakage current tracker (312) and parasitic capacitance (313) are two intermediate parallel circuits, and parasitic capacitance (313) is close to parasitic electricity
(314) side is hindered, is connected with string on the outside of four parallel branches on the main road of the noise reduction interference circuit of photodiode (31)
Join resistance (316)；
Amplifying circuit device (32) circuit is the amplifying circuit under guided optical mode, and the positive terminal of noise reduction interference circuit, which is connected to, to be put
The anode of big circuit device (32), side is linked into input by amplifying resistance A (321) on the positive terminal main road of noise reduction interference circuit
The one end voltage U i, the output end that the other side is linked into amplifying circuit device (32) by amplifying resistance C (323), noise reduction interfere circuit
Negative pole end be connected to amplifying circuit device (32) cathode and by amplification resistance B (322) ground connection.
2. a kind of osc optical signal reception device calculated for precision according to claim 1, which is characterized in that institute
State receive shell (1) at the top of be provided with dial (11), dial (11) by adjust amplification resistance B (322) and
Amplify the ratio discharge circuit electric current of resistance A (321), shell tailstock (12) setting is receiving shell (1) and optical signal reception head
(2) opposite one end, shell tailstock (12) is intermediate to be provided with signal output (121), and signal output (121) will by conducting wire
The circuit current signal of amplification is output to the display end of oscillograph, and the side for receiving shell (1) is provided with power supply insert port (13),
Power supply insert port (13) provides external power supply to light signal receiving by conducting wire.
3. a kind of osc optical signal reception device calculated for precision according to claim 1, which is characterized in that institute
Stating optical signal and receiving head (2) is spherical convex lens structure, and it is connecing for photodiode (31) that optical signal, which receives head (2) center,
One end is received, optical signal receives head (2) and is mounted on optical signal transmission band (21), and optical signal transmission band (21) is connected to noise reduction interference
Circuit on.
4. a kind of osc optical signal reception device calculated for precision according to claim 1, which is characterized in that institute
It states and is equipped on second circuit board (4) the second A/D converter (41), amplifying circuit device (32) output end passes through second resistance A
(42) and second resistance B (44) is connected to the second A/D converter (41) positive terminal, second resistance A (42) and second resistance B (44)
Between lead-out wire the output ends of the second A/D converter (41), the second A/D converter (41) be connected to by the second capacitor A (43)
Cathode is grounded by second resistance C (45), and the second capacitor B (46) is connected to the by the conducting wire of second resistance C (45) ground connection one end
The anode of two A/D converters (41), the second A/D converter (41) cathode are connected to the 2nd A/D conversion by second resistance D (47)
Device (41) output end.
5. a kind of osc optical signal reception device calculated for precision according to claim 1, which is characterized in that institute
It states and is equipped on tertiary circuit plate (5) third A/D converter (51), the second A/D converter (41) output end passes through third capacitor A
(52) and third capacitor B (53) is connected to the anodes of third A/D converter (51), third capacitor A (52) and third capacitor B (53)
Between the lead that connects by 3rd resistor B (55) be connected to third A/D converter (51) output end, third A/D converter
(51) it is grounded by 3rd resistor C (56), 3rd resistor C (56) ground terminal is connected to third capacitor A by 3rd resistor A (54)
(52) between third capacitor B (53), third A/D converter (51) cathode is connected to the 3rd A/D by the 4th resistance D (57) and turns
Parallel operation (51) output end.
6. a kind of osc optical signal reception device calculated for precision according to claim 4, which is characterized in that institute
The feedback resistance that second resistance D (47) is the second A/D converter (41) cathode is stated, the second capacitor A (43) is the second A/D converter
(41) positive feedback capacity.
7. a kind of osc optical signal reception device calculated for precision according to claim 5, which is characterized in that institute
The feedback resistance that 3rd resistor B (55) is third A/D converter (51) anode is stated, the 4th resistance D (57) is third A/D converter
(51) feedback resistance of cathode.
8. a kind of osc optical signal reception device calculated for precision according to claim 1, which is characterized in that should
Working method for the osc optical signal reception device that precision calculates, comprising the following steps:
It receives the one end of shell (1) Step 1: optical signal reception head (2) is mounted on and is connected to optical signal transmission band (21)
On, it is equipped on optical signal transmission band (21) photodiode (31), the first circuit board (3) at photodiode (31) rear,
Second circuit board (4) and tertiary circuit plate (5), which are sequentially arranged at, receives shell (1) inside, and signal output (121), which is connected to, to be shown
In wave device circuit, and external power supply is inputted by power supply insert port (13)；
Step 2: optical signal reception head (2) is placed in faint light source spot, light wave is mixedly appeared with noise waves and is connect in optical signal
It receives in head (2), the noise reduction interference circuit of photodiode (31) is issued by the radiant light excitation current source of noisy power (316)
Electric current, the both ends that photodiode (31) has a reverse bias voltage reversely to increase to photodiode (31), at this point, parasitic
The value of capacitor (313) significantly reduces, and the electric current of leakage current tracker (312) increases, and parasitic capacitance (313) value is significantly
Being switched fast and responding rapidly to for photoelectric sensor circuit is realized in variation；
Step 3: the optical signal of primary filtration is transferred in the amplifying circuit of amplifying circuit device (32) in step 2, pass through adjusting
Control panel (11) adjusts amplification resistance B (322) and amplifies the ratio of resistance A (321), thus in the ring of unknown light signal strength
Most suitable amplification factor is adjusted in border；
Step 4: the optical signal in step 3 is transferred to the second order filter of low-pass filter circuit and high-pass filtering circuit after amplification
In wave circuit, the lower-cut-off frequency of low-pass filter circuit is f1, and the upper cut-off frequency of high-pass filtering circuit is f2, into excessively two
The filtered frequency bandwidth of rank are as follows: B=f2-f1, lower-cut-off frequency is f1 and upper cut-off frequency is f2 respectively by formula meter
It calculates, according to precision it needs to be determined that numerical value；
Step 5: the electric signal in step 4 by second order filtering is input in oscillograph by signal output (121), oscillography
Device is shown the received optical signal of reception device display screen in the form of waveform.
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Application publication date: 20190402 |