CN107817097A - Laser optical detection circuit - Google Patents
Laser optical detection circuit Download PDFInfo
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- CN107817097A CN107817097A CN201711266269.4A CN201711266269A CN107817097A CN 107817097 A CN107817097 A CN 107817097A CN 201711266269 A CN201711266269 A CN 201711266269A CN 107817097 A CN107817097 A CN 107817097A
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- 238000001514 detection method Methods 0.000 title claims abstract description 104
- 230000003287 optical effect Effects 0.000 title claims abstract description 72
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- 230000011664 signaling Effects 0.000 claims abstract description 21
- 230000003321 amplification Effects 0.000 claims abstract description 20
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 20
- 238000012545 processing Methods 0.000 claims abstract description 6
- 230000005611 electricity Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 5
- 239000013307 optical fiber Substances 0.000 description 5
- 230000005622 photoelectricity Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000000835 fiber Substances 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000011982 device technology Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
-
- 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
- G01J1/4228—Photometry, e.g. photographic exposure meter using electric radiation detectors arrangements with two or more detectors, e.g. for sensitivity compensation
-
- 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
- G01J1/4257—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam
-
- 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
-
- 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
- G01J2001/4413—Type
- G01J2001/4426—Type with intensity to frequency or voltage to frequency conversion [IFC or VFC]
-
- 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
- G01J2001/4446—Type of detector
- G01J2001/446—Photodiode
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of laser optical detection circuit,Laser of the laser to be measured in tested point is detected using the first optical detection device,Obtain the first current signal and export,First signaling conversion circuit is converted to first voltage signal to the first current signal and exported,Second optical detection device detects to the laser of tested point,Obtain the second current signal and export,Secondary signal change-over circuit is converted to second voltage signal to the second current signal and exported,Signal inversion circuit carries out anti-phase acquisition reverse voltage signal to second voltage signal and exported,So,After differential amplifier circuit carries out differential amplification processing according to first voltage signal and voltage inversion signal,The noise carried out in light detection process can be eliminated,And enhance and obtained useful signal is detected to laser,So that noise is few in light detecting signal,Accuracy is high.
Description
Technical field
The present invention relates to field of laser device technology, more particularly to a kind of laser optical detection circuit.
Background technology
Laser is a kind of device that can launch laser, and optical fiber laser is one kind of laser, has high power, original text light
The features such as beam quality, high efficiency and small size.Laser application scope is wide, the effect that its laser intensity difference launched reaches
Difference, light detection is carried out to laser and is necessary.
However, when carrying out light detection to laser using existing way, the signal noise detected is big, i.e., testing result is not
Accurately.
The content of the invention
Based on this, it is necessary to the problem of for laser optical testing result inaccuracy, there is provided one kind can improve signal reception
The laser optical detection circuit of accuracy.
A kind of laser optical detection circuit, including：First optical detection device, the second optical detection device, the conversion of the first signal
Circuit, secondary signal change-over circuit, signal inversion circuit and differential amplifier circuit；
First optical detection device is connected by first signaling conversion circuit with the differential amplifier circuit, described
Second optical detection device is connected by the secondary signal change-over circuit with the input of the signal inversion circuit, the signal
The output end of negative circuit is connected with the differential amplifier circuit；
First optical detection device detects to laser of the laser to be measured in tested point, obtains the first current signal
And export, first signaling conversion circuit is converted to first voltage signal to first current signal and exported, and described
Two optical detection devices detect to the laser of the tested point, obtain the second current signal and export, the secondary signal turns
Change circuit to be converted to second voltage signal to second current signal and export, the signal inversion circuit is to the described second electricity
Pressure signal carries out anti-phase acquisition reverse voltage signal and simultaneously exported, the differential amplifier circuit according to the first voltage signal and
Voltage inversion signal carries out differential amplification processing, obtains light detecting signal.
In one of the embodiments, first optical detection device is the first photodiode, the second light detection
Device is the second photodiode.
In one of the embodiments, first signaling conversion circuit includes the first operational amplifier and the first electricity
Resistance, the plus earth of first photodiode, negative pole connect the inverting input of first operational amplifier, and described the
The positive input end grounding of one operational amplifier, the output end of first operational amplifier connect the differential amplifier circuit,
The first resistor is connected between inverting input and the output end of first operational amplifier.
In one of the embodiments, above-mentioned laser optical detection circuit, in addition to the first electric capacity, first electric capacity
One end connects the positive pole of first photodiode, and the other end connects the negative pole of first photodiode.
In one of the embodiments, above-mentioned laser optical detection circuit, in addition to it is connected to first operation amplifier
The second electric capacity between the inverting input and output end of device.
In one of the embodiments, the secondary signal change-over circuit includes the second operational amplifier and the second electricity
Resistance, the plus earth of second photodiode, negative pole connect the inverting input of second operational amplifier, and described the
The positive input end grounding of two operational amplifiers, the output end of second operational amplifier connect the signal inversion circuit,
The second resistance is connected between inverting input and the output end of second operational amplifier.
In one of the embodiments, above-mentioned laser optical detection circuit, in addition to the 3rd electric capacity, the 3rd electric capacity
One end connects the positive pole of second photodiode, and the other end connects the negative pole of second photodiode.
In one of the embodiments, above-mentioned laser optical detection circuit, in addition to it is connected to second operation amplifier
The 4th electric capacity between the inverting input and output end of device.
In one of the embodiments, the signal inversion circuit includes the 3rd operational amplifier, 3rd resistor and the
Four resistance, the secondary signal change-over circuit are connected by the inverting input of the 3rd resistor and the 3rd operational amplifier
Connect, the positive input ground connection of the 3rd operational amplifier, the 3rd operational amplifier inverting input passes through the 4th electricity
Resistance connects the output end of the 3rd operational amplifier, and the output end of the 3rd operational amplifier connects the differential amplification electricity
Road.
In one of the embodiments, the differential amplifier circuit includes four-operational amplifier, the 5th resistance, the 6th electricity
Resistance, the 7th resistance and the 8th resistance, first signaling conversion circuit are put by the 5th resistance with the 4th computing
The normal phase input end connection of big device, the signal inversion circuit are anti-by the 6th resistance and the four-operational amplifier
Phase input is connected, and one end of the 7th resistance connects the normal phase input end of the four-operational amplifier, and the other end is grounded,
8th resistance is connected between inverting input and the output end of the four-operational amplifier.
Above-mentioned laser optical detection circuit, laser of the laser to be measured in tested point is distinguished using two-way light sense channel
Detected, i.e., carry out laser acquisition respectively to same tested point by two optical detection devices, the first optical detection device is treated
The laser of measuring point carries out detection and obtains the first current signal, and the second optical detection device carries out detection to the laser of tested point and obtains the
Two current signals.Because optical detection device is the detection to optical signal, need to be converted into voltage letter after obtaining current signal
Number, by setting the first signaling conversion circuit and secondary signal change-over circuit, the current signal of two-way is changed respectively, the
One signaling conversion circuit is converted to first voltage signal to the first current signal and exported, and secondary signal change-over circuit is to the second electricity
Stream signal is converted to second voltage signal and exported, and anti-phase obtain instead is carried out to second voltage signal by signal inversion circuit
Phase voltage signal, prepared subsequently to do difference, in this way, differential amplifier circuit is believed according to first voltage signal and voltage inversion
After number carrying out differential amplification processing, the noise carried out in light detection process can be eliminated, and enhances and laser is detected to obtain
Useful signal, useful signal amplitude is high so that noise is few in light detecting signal, and accuracy is high.
Brief description of the drawings
Fig. 1 is the structural representation of the laser optical detection circuit of an embodiment；
Fig. 2 is the structural representation of the laser optical detection circuit of another embodiment.
Embodiment
Referring to Fig. 1, a kind of laser optical detection circuit of embodiment is provided, including：First optical detection device 110,
Two optical detection devices 120, the first signaling conversion circuit 130, secondary signal change-over circuit 140, signal inversion circuit 150 and poor
Divide amplifying circuit 160.First optical detection device 110 is connected by the first signaling conversion circuit 130 with differential amplifier circuit 160,
Second optical detection device 120 is connected by secondary signal change-over circuit 140 with the input of signal inversion circuit 150, and signal is anti-
The output end of circuitry phase 150 is connected with differential amplifier circuit 160.
First optical detection device 110 detects to laser of the laser to be measured in tested point, obtains the first current signal
And export, the first signaling conversion circuit 130 is converted to first voltage signal to the first current signal and exported, the second light detection dress
The laser for putting 120 pairs of tested points detects, and obtains the second current signal and exports, secondary signal change-over circuit 140 is to second
Current signal is converted to second voltage signal and exported, and signal inversion circuit 150 carries out anti-phase obtain instead to second voltage signal
Phase voltage signal simultaneously exports, and differential amplifier circuit 160 carries out differential amplification according to first voltage signal and voltage inversion signal
Processing, obtain light detecting signal.
Differential amplifier circuit 160 is amplification difference mode signal suppression common mode signal, by signal inversion circuit 150 to the second electricity
Signal is pressed to carry out anti-phase acquisition reverse voltage signal, so as to make reverse voltage and first voltage signal phase on the contrary, follow-up
When carrying out differential amplification by difference channel, obtained light detecting signal is the signal after amplification, while is eliminated after noise differential,
Noise is reduced, improves the accuracy of light detecting signal.
Above-mentioned laser optical detection circuit, laser of the laser to be measured in tested point is distinguished using two-way light sense channel
Detected, i.e., carry out laser acquisition respectively to same tested point by two optical detection devices, the first optical detection device 110 is right
The laser of tested point carries out detection and obtains the first current signal, and the second optical detection device 120 detects to the laser of tested point
Obtain the second current signal.Because optical detection device is the detection to optical signal, need to be converted into after obtaining current signal
Voltage signal, by setting the first signaling conversion circuit 130 and secondary signal change-over circuit 140, the electric current of two-way is believed respectively
Number changed, the first signaling conversion circuit 130 is converted to first voltage signal to the first current signal and exported, secondary signal
Change-over circuit 140 is converted to second voltage signal to the second current signal and exported, and by signal inversion circuit 150 to second
Voltage signal carries out anti-phase acquisition reverse voltage signal, is prepared subsequently to do difference, in this way, the basis of differential amplifier circuit 160
After reverse voltage signal after first voltage signal and second voltage signal inversion carries out differential amplification processing, progress can be eliminated
Noise in light detection process, and enhance and obtained useful signal is detected to laser so that noise in light detecting signal
Few, accuracy is high.
The location point that above-mentioned two optical detection device carries out laser detection is identical, i.e., the first current signal is that tested point is entered
The current signal obtained after row laser detection, the second current signal are also that the electric current for tested point obtain after laser detection is believed
Number, in this way, the environment that above-mentioned two optical detection device carries out laser detection is identical, the noise level being subjected to is essentially identical,
After subsequently carrying out differential amplification to the reverse voltage signal after first voltage signal and second voltage signal inversion, obtain
Light detecting signal is the amplification to the input signal of differential amplifier circuit 160, and eliminates noise, improves accuracy.First
When voltage signal is identical with second voltage signal, then the reverse voltage signal after second voltage signal inversion and first voltage signal
It is anti-phase, after differential amplification signal, the double output of signal can be obtained light detecting signal.In one example, the first light is examined
The optical detection device 120 of device 110 and second is surveyed to be set up in parallel and be located at tested point.
In one example, above-mentioned laser optical detection circuit can be optical fiber laser optical detection circuit, then above-mentioned to treat
Survey laser is testing fiber laser.
Referring to Fig. 2, in one of the embodiments, the first optical detection device 110 is the first photodiode PD1, the
Two optical detection devices 120 are the second photodiode PD2.
Photodiode works under backward voltage effect, caused under the light irradiation of general illumination
Electric current is photoelectric current.If connecting load on external circuit, electric signal is just obtained in load, and this electric signal is with light
Change and respective change.When not having illumination, reverse current is extremely faint, when there is laser irradiation, reverse current increase, swashs
Luminous intensity is bigger, and reverse current is bigger.The change of light causes photodiode current to change, and this can is converted into optical signal
Electric signal, turn into optoelectronic sensor.
Please continue to refer to Fig. 2, in one of the embodiments, the first signaling conversion circuit 130 includes the first operation amplifier
Device U1 and first resistor R1, the first photodiode PD1 plus earth, negative pole connect the anti-phase of the first operational amplifier U1
Input r2, the first operational amplifier U1 normal phase input end r1 ground connection, the first operational amplifier U1 output end t1 connections are poor
Divide amplifying circuit 160, first resistor R1 is connected between the first operational amplifier U1 inverting input r2 and output end t1.
First photodiode PD1 detects to laser, and the first obtained current signal belongs to faint current signal,
Need to transmit it to corresponding first signaling conversion circuit 130 progress current/voltage (I/V) conversion, faint electric current is believed
Number voltage signal is converted into, and can realize and amplify signal, it will be understood that the first voltage signal after conversion is to the first photoelectricity
(the first operational amplifier U1's is anti-phase defeated for voltage corresponding to the first current signal obtained after diode PD1 progress laser detections
Enter to hold r2 input voltage) amplification, avoid current signal is too faint from being flooded by noise, cause detection inaccurate.
Specifically, the first photodiode PD1 produces photoelectric current after carrying out laser detection, due to the first operational amplifier U1
Inverting input r2 be connected with the first photodiode PD1, then the first operational amplifier U1 inverting input r2 has photoelectricity
Stream, it will be understood that the first operational amplifier U1 inverting input r2 has voltage corresponding with photoelectric current, the first operation amplifier
Device U1 output end t1 is connected by first resistor R1 with the first operational amplifier U1 inverting input r2, and the first computing is put
Big device U1 output end t1 is connected by first resistor R1 with the first photodiode PD1 negative pole, its plus earth, so as to,
First operational amplifier U1 output end t1 is grounded by first resistor R1 and the first photodiode PD1, in the first photoelectricity two
When negative pole produces photoelectric current, photoelectric current flows through pole pipe PD1 on first resistor R1, the first operational amplifier U1 output end t1's
Voltage is first resistor R1 voltage drop, in this way, realizing the output end t1 that photoelectric current is converted to the first operational amplifier U1
Voltage, i.e. the voltage of the first operational amplifier U1 output end t1 is first voltage signal, and first voltage signal is
The amplification of one operational amplifier U1 inverting input r2 input voltage.It is appreciated that if the first photodiode PD1 is produced
Photoelectric current be i1, then in the first signal adapter the first operational amplifier U1 export first voltage signal for photoelectric current i1 with
First resistor R1 product.
In one of the embodiments, above-mentioned laser optical detection circuit, in addition to the first electric capacity C1, the first electric capacity C1's
One end connects the first photodiode PD1 positive pole, and the other end connects the first photodiode PD1 negative pole.
In laser testing process is carried out, due to external interference, laser testing process is had an impact, it is extraneous dry to reduce
Disturb, improve detection accuracy, the first electric capacity C1 of parallel connection, passes through the first electric capacity C1 between the first photodiode PD1 the two poles of the earth
Photoelectric current caused by laser detection is filtered.
In one of the embodiments, above-mentioned laser optical detection circuit, in addition to it is connected to the first operational amplifier U1
Inverting input r2 and output end t1 between the second electric capacity C2.
Further to reduce interference, detection stability is improved, in the second electric capacity C2 of first resistor R1 both ends parallel connection, to enter
Row signal filters, and filters out the noise of photoelectric current.
In one of the embodiments, secondary signal change-over circuit 140 includes the electricity of the second operational amplifier U2 and second
Hindering R2, the second photodiode PD2 plus earth, negative pole connects the second operational amplifier U2 inverting input r4, and second
Operational amplifier U2 normal phase input end r3 ground connection, the second operational amplifier U2 output end t2 connection signal inversions circuit 150,
Second resistance R2 is connected between the second operational amplifier U2 inverting input r4 and output end t2.
Second photodiode PD2 detects to laser, and the second obtained current signal belongs to faint current signal,
Need to transmit it to the corresponding progress current/voltage-converted of secondary signal change-over circuit 140, faint current signal is changed
Into voltage signal, and it can realize and amplify signal, it will be understood that the second voltage signal after conversion is to the second photodiode
(the second operational amplifier U2 inverting input r4's is defeated for voltage corresponding to the current signal obtained after PD2 progress laser detections
Enter voltage) amplification, avoid current signal is too faint from being flooded by noise, cause detection inaccurate.
Specifically, the second photodiode PD2 produces photoelectric current after carrying out laser detection, due to the second operational amplifier U2
Inverting input r4 be connected with the second photodiode PD2, then the second operational amplifier U2 inverting input r4 has photoelectricity
Stream, it will be understood that the second operational amplifier U2 inverting input r4 has voltage corresponding with photoelectric current, the second operation amplifier
Device U2 output end t2 is connected by second resistance R2 with the second operational amplifier U2 inverting input r4, and the second computing is put
Big device U2 output end t2 is connected by second resistance R2 with the second photodiode PD2 negative pole, its plus earth, so as to,
Second operational amplifier U2 output end t2 is grounded by second resistance R2 and the second photodiode PD2, in the second photoelectricity two
When negative pole produces photoelectric current, photoelectric current flows through pole pipe PD2 on second resistance R2, the second operational amplifier U2 output end t2's
Voltage is second resistance R2 voltage drop, in this way, realizing the output end t2 that photoelectric current is converted to the second operational amplifier U2
Voltage, i.e. the voltage of the second operational amplifier U2 output end t2 is second voltage signal, and second voltage signal is pair
The amplification of second operational amplifier U2 inverting input r4 input voltage.It is appreciated that if the second photodiode PD2 is produced
Raw photoelectric current is i2, then the second voltage signal that the second operational amplifier U2 is exported in secondary signal converter is photoelectric current i2
With second resistance R2 product.
In one of the embodiments, above-mentioned laser optical detection circuit, in addition to the 3rd electric capacity C3, the 3rd electric capacity C3's
One end connects the second photodiode PD2 positive pole, and the other end connects the second photodiode PD2 negative pole.
The 3rd electric capacity C3 of parallel connection between the second photodiode PD2 the two poles of the earth, by the 3rd electric capacity C3 to laser detection
Caused photoelectric current is filtered, and reduces external interference, reduces noise, improves detection accuracy.
In one of the embodiments, above-mentioned laser optical detection circuit, in addition to it is connected to the second operational amplifier U2
Inverting input r4 and output end t2 between the 4th electric capacity C4.
Further to reduce interference, detection stability is improved, in the 4th electric capacity C4 of second resistance R2 both ends parallel connection, to enter
Row signal filters, and filters out the noise of photoelectric current.
In one of the embodiments, signal inversion circuit 150 includes the 3rd operational amplifier U3,3rd resistor R3 and the
Four resistance R4, secondary signal change-over circuit 130 are connected by 3rd resistor R3 and the 3rd operational amplifier U3 inverting input r5
Connect, the 3rd operational amplifier U3 normal phase input end r6 ground connection, the 3rd operational amplifier U3 inverting input r5 passes through the 4th
The operational amplifier U3 of resistance R4 connections the 3rd output end t3, the 3rd operational amplifier U3 output end t3 connections differential amplification electricity
Road 160.
First voltage signal is directly exported relative to the first signaling conversion circuit 130 to differential amplifier circuit 160, the second letter
The second voltage signal of number change-over circuit 140 is also needed to by signal inversion circuit 150, realize second voltage signal is carried out it is anti-
Phase.In this embodiment, by the setting signal negative circuit 150 between secondary signal change-over circuit 140 and difference channel, by
The progress of two voltage signals is anti-phase to obtain reverse voltage signal.
It is appreciated that the 3rd resistor R3 of signal inversion circuit 150, the 4th resistance R4, the 3rd operational amplifier U3 and
Between annexation form an inverting amplifier, i.e. the 3rd operational amplifier U3 output end t3 output voltage signal be
Anti-phase amplification to the second voltage signal of secondary signal change-over circuit output.Specifically, the 3rd operational amplifier U3 output
The voltage signals of t3 outputs is held as K times of second voltage signal of the output of secondary signal change-over circuit, K is the 4th resistance R4 and the
The opposite number of three resistance R3 ratios.
Specifically, the output end t2 of the second operational amplifier U2 in secondary signal change-over circuit 140 passes through 3rd resistor
R3 is connected with the 3rd operational amplifier U3 normal phase input end r5, you can is realized to the second operational amplifier U2 output end t2's
The anti-phase amplification of voltage signal.
In one of the embodiments, differential amplifier circuit 160 includes four-operational amplifier U4, the 5th resistance R3, the
Six resistance R4, the 7th resistance R5 and the 8th resistance R6, the first signaling conversion circuit 130 pass through the 5th resistance R3 and the 4th computing
Amplifier U4 normal phase input end r7 connections, signal inversion circuit 150 pass through the 6th resistance R4's and four-operational amplifier U4
Inverting input r8 connections, the 7th resistance R5 one end connection four-operational amplifier U4 normal phase input end r7, another termination
Ground, the 8th resistance R6 are connected between four-operational amplifier U4 inverting input r8 and output end.
The first voltage signal of first operational amplifier U1 outputs is put by being transferred to the 4th computing after the 5th resistance R5
The second voltage signal of big device U4 normal phase input end r7, the second operational amplifier U2 output after the 6th resistance R6 by transmitting
To four-operational amplifier U4 inverting input r8, the 5th resistance R5 normal phase input end r7 with four-operational amplifier U4
One end of connection is also grounded by the 7th resistance R7, the first operational amplifier U1 output end t1's and four-operational amplifier U4
The voltage for the normal phase input end r7 that voltage difference between normal phase input end r7 is four-operational amplifier U4, four-operational amplifier
U4 normal phase input end r7 voltage is the voltage drop on the 5th resistance R5, and the 5th resistance R5 and the 7th resistance R7 resistance are
Know, so as to understand four-operational amplifier U4 normal phase input ends according to the first operational amplifier U1 output end t1 voltage
Voltage, it is empty short between four-operational amplifier U4 normal phase input end r7 and inverting input, and then, it is known that the 4th operation amplifier
Device U4 inverting input r8 voltage, the 3rd operational amplifier U3 output end t3 and four-operational amplifier U4's is anti-phase defeated
It is the pressure drop on the 6th resistance R6, four-operational amplifier U4 anti-phase input to enter to hold the voltage difference between the voltage difference between r8
It is the pressure drop on the 8th resistance R8 to hold the voltage difference between r8 and four-operational amplifier U4 output end t4, in this way, available
Four-operational amplifier U4 output end t4 voltage is light detecting signal, realizes that voltage signal amplifies.
Specifically, the output end t1 of the first operational amplifier U1 in the first signaling conversion circuit 130 passes through the 5th resistance
R5 is connected with four-operational amplifier U4 normal phase input end r7, and the 3rd operational amplifier U3 output end t3 passes through the 6th resistance
R6 is connected with four-operational amplifier U4 inverting input r8.
To sum up, the first optical detection device 110 is carried out obtaining after the first current signal that laser detection obtains is changed
First voltage signal keep it is constant, by being input to differential amplifier circuit 160 after 3rd resistor R3, to the second optical detection device
The second current signal that 120 progress laser detections obtain carries out the second voltage signal obtained after turning, it is also necessary to carries out anti-phase obtain
To reverse voltage signal, reverse voltage signal and first voltage signal obtain light detection letter by differential amplifier circuit 160 together
Number, differential amplifier circuit 160 makes the valid signal strengths increase that can detect light, while noise is cancelled out each other, final effect
It is exactly signal enhancing, sensitivity improves, and strong antijamming capability, noise level is very low, i.e. the light detecting signal of final output is accurate
Property it is high.Specifically, above-mentioned laser optical detection circuit using common photodiode can realize weak laser signal (>=
Detection 10uW), due to that can realize noise cancellation, so very small by outer signals interference effect, noise exports small (＜
2MV), small-signal strengthens, and detection sensitivity is high.Fiber leaky detection, the high reverse-examination of optical fiber laser for optical fiber laser
Survey, optical fiber laser seed source detection etc. has extraordinary application effect.
Each technical characteristic of above example can be combined arbitrarily, to make description succinct, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, lance is not present in the combination of these technical characteristics
Shield, all it is considered to be the scope of this specification record.
Above example only expresses several embodiments of the present invention, its describe it is more specific and in detail, but can not be because
This and be interpreted as the limitation to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art,
On the premise of not departing from present inventive concept, various modifications and improvements can be made, these belong to protection scope of the present invention.
Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
- A kind of 1. laser optical detection circuit, it is characterised in that including：First optical detection device, the second optical detection device, first Signaling conversion circuit, secondary signal change-over circuit, signal inversion circuit and differential amplifier circuit；First optical detection device is connected by first signaling conversion circuit with the differential amplifier circuit, and described second Optical detection device is connected by the secondary signal change-over circuit with the input of the signal inversion circuit, the signal inversion The output end of circuit is connected with the differential amplifier circuit；First optical detection device detects to laser of the laser to be measured in tested point, and the first current signal of acquisition is simultaneously defeated Go out, first signaling conversion circuit is converted to first voltage signal to first current signal and exported, second light Detection means detects to the laser of the tested point, obtains the second current signal and exports, the secondary signal conversion electricity Road is converted to second voltage signal to second current signal and exported, and the signal inversion circuit is believed the second voltage Number carrying out anti-phase acquisition reverse voltage signal and exports, and the differential amplifier circuit is according to the first voltage signal and voltage Inversion signal carries out differential amplification processing, obtains light detecting signal.
- 2. laser optical detection circuit according to claim 1, it is characterised in that first optical detection device is first Photodiode, second optical detection device are the second photodiode.
- 3. laser optical detection circuit according to claim 2, it is characterised in that first signaling conversion circuit includes First operational amplifier and first resistor, the plus earth of first photodiode, negative pole connect first computing The inverting input of amplifier, the positive input end grounding of first operational amplifier, first operational amplifier it is defeated Go out end and connect the differential amplifier circuit, the first resistor is connected to the inverting input of first operational amplifier and defeated Go out between end.
- 4. laser optical detection circuit according to claim 3, it is characterised in that also including the first electric capacity, described first One end of electric capacity connects the positive pole of first photodiode, and the other end connects the negative pole of first photodiode.
- 5. laser optical detection circuit according to claim 3, it is characterised in that also include being connected to first computing The second electric capacity between the inverting input and output end of amplifier.
- 6. laser optical detection circuit according to claim 2, it is characterised in that the secondary signal change-over circuit includes Second operational amplifier and second resistance, the plus earth of second photodiode, negative pole connect second computing The inverting input of amplifier, the positive input end grounding of second operational amplifier, second operational amplifier it is defeated Go out end and connect the signal inversion circuit, the second resistance is connected to the inverting input of second operational amplifier and defeated Go out between end.
- 7. laser optical detection circuit according to claim 6, it is characterised in that also including the 3rd electric capacity, the described 3rd One end of electric capacity connects the positive pole of second photodiode, and the other end connects the negative pole of second photodiode.
- 8. laser optical detection circuit according to claim 6, it is characterised in that also include being connected to second computing The 4th electric capacity between the inverting input and output end of amplifier.
- 9. laser optical detection circuit according to claim 1, it is characterised in that the signal inversion circuit includes the 3rd Operational amplifier, 3rd resistor and the 4th resistance, the secondary signal change-over circuit pass through the 3rd resistor and described the The inverting input connection of three operational amplifiers, the positive input end grounding of the 3rd operational amplifier, the 3rd computing The inverting input of amplifier connects the output end of the 3rd operational amplifier, the 3rd operation amplifier by the 4th resistance The output end of device connects the differential amplifier circuit.
- 10. the laser optical detection circuit according to any one in claim 1-9, it is characterised in that the difference is put Big circuit includes four-operational amplifier, the 5th resistance, the 6th resistance, the 7th resistance and the 8th resistance, first signal Change-over circuit is connected by the 5th resistance with the normal phase input end of the four-operational amplifier, the signal inversion circuit It is connected by the 6th resistance with the inverting input of the four-operational amplifier, one end connection institute of the 7th resistance The normal phase input end of four-operational amplifier, other end ground connection are stated, the 8th resistance is connected to the four-operational amplifier Inverting input and output end between.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711266269.4A CN107817097B (en) | 2017-12-05 | 2017-12-05 | Laser light detection circuit |
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|---|---|---|---|
| CN201711266269.4A CN107817097B (en) | 2017-12-05 | 2017-12-05 | Laser light detection circuit |
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| CN107817097A true CN107817097A (en) | 2018-03-20 |
| CN107817097B CN107817097B (en) | 2024-05-31 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110887982A (en) * | 2019-12-17 | 2020-03-17 | 深圳市知用电子有限公司 | Optical fiber differential probe |
| CN111426652A (en) * | 2020-04-14 | 2020-07-17 | 苏州冠德能源科技有限公司 | Middle and far infrared laser detection device |
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| CN107817097B (en) | 2024-05-31 |
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