CN109883335A - A kind of Minitype digital CMOS laser displacement sensor circuit system - Google Patents
A kind of Minitype digital CMOS laser displacement sensor circuit system Download PDFInfo
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Abstract
The embodiment of the present application provides a kind of Minitype digital CMOS laser displacement sensor circuit system, including processor module, cmos image sensing module, constant-current control module, input/output module, and the power module for above each module for power supply, the cmos image sensing module and the constant-current control module are electrically connected, the constant-current control module, the input/output module is electrically connected with the processor module respectively, the constant-current control module includes the semiconductor laser diode constant-current drive circuit and feedback unit being electrically connected with the processor module, the cmos image sensing module, the semiconductor laser diode constant-current control circuit is electrically connected with the feedback unit respectively.Minitype digital CMOS laser displacement sensor circuit system of the invention, the brightness automatic gain control of semiconductor laser diode luminescence chip is made by circuit configuration, realizes the high-acruracy survey performance of sensor.
Description
Technical field
The present invention relates to displacement sensor circuit systems technology field, specifically a kind of Minitype digital CMOS laser displacement is passed
Sensor circuit system.
Background technique
Laser displacement sensor has brilliant performance in terms of non-contact forecasting displacement, not with photoelectric technology
Disconnected development, as the circuit system of displacement sensor core component, is also constantly updating.
Prior art CN106441110A provides a kind of high precision laser displacement sensor system based on CMOS, mainly
Solve the problems, such as that prior art peripheral circuit complexity and measurement accuracy be not high.The system is by power module, two pole of semiconductor laser
Tube module, digital signal processing module, image sensing module, direct-injection type triangulation module and differential type subtraction circuit composition,
Wherein semiconductor laser diode module is radiated on image sensing module by the infrared laser of direct-injection type triangulation module,
Image sensing module complete hot spot perceive and convert optical signals to after analog electrical signal by differential type subtraction circuit export to
Digital signal processing module carries out AD acquisition, and digital signal processing module carries out calculation process, output to the digital signal of acquisition
Digitized actual displacement amount.The technological merit is to utilize cmos image as photoelectric device using cmos image sensor
The measurement advantage of sensor, improves measurement accuracy to a certain extent.
But the processing in above-mentioned technology, using constant-current source circuit and slow start circuit as the input current of diode
Circuit is merely able to guarantee to provide stable electric current for the input terminal of diode, is unable to ensure the hot spot brightness on photosensitive element
Stability leads to that detection accuracy is relatively low, testing result accuracy is poor so that testing result is unstable.
Summary of the invention
The purpose of the present invention is to solve the above problem, provides a kind of Minitype digital CMOS laser displacement sensor circuit
System can be realized bright on photosensitive element by the cooperation of semiconductor laser diode constant-current drive circuit and feedback unit
The automatic gain control of degree, it is ensured that the stability of light improves measurement accuracy and testing result accuracy.
To achieve the above object, the present invention provides a kind of Minitype digital CMOS laser displacement sensor circuit system, packets
Include processor module, cmos image sensing module, constant-current control module, input/output module and for above each module for power supply
Power module, the cmos image sensing module and the constant-current control module be electrically connected, the constant-current control module, institute
It states input/output module to be electrically connected with the processor module respectively, the constant-current control module includes and the processor die
The semiconductor laser diode constant-current drive circuit and feedback unit that block is electrically connected, it is the cmos image sensing module, described
Semiconductor laser diode constant-current control circuit is electrically connected with the feedback unit respectively.
Preferably, the feedback unit include sequentially connected resistance R1, it is resistance R33, potentiometer VR1, resistance R13, anti-
Bias current amplifier U6 that phase input terminal is connect with the resistance R1, it is connect with the bias current amplifier U6 output end
Resistance R10, the feedback score capacitor C28, the resistance R1 and the bias current amplifier U6 that are connect with the resistance R10
Inverting input terminal connection, the resistance R33, the potentiometer VR1, the feedback score capacitor C28 are banished with the biased electrical
Big device U6 is in parallel, and the normal phase input end of the bias current amplifier U6 connects reference circuit.
Preferably, the bias current amplifier U6 includes the first amplifier U6A and the second amplifier U6B, the resistance
R1 is connect with the reverse input end of the second amplifier U6B, and the positive of the reference circuit and the second amplifier U6B is defeated
Enter end connection, one end of the resistance R10 is connect with the output end of the second amplifier U6B, the other end of the resistance R10
It is connect with the inverting input terminal of the first amplifier U6A, the feedback score capacitor C28 and the first amplifier U6A are simultaneously
Connection.
Preferably, the luminescence chip of the semiconductor laser diode in the semiconductor laser diode constant-current control circuit
LD is electrically connected through triode and the processor module and carries out light emitting control, is electrically connected through triode and the feedback unit
Carry out duty cycle adjustment.
Preferably, the power module include power supply circuit, connect with the power supply circuit output end it is anti-
Current feed circuit.
Preferably, the feed circuit includes being connected in series between the power supply circuit output terminal and ground terminal
High-precision feedback resistance RF1, RF2.
Preferably, the input/output module includes analog output unit, the analog output unit be electric current with
Voltage analog output control circuit, the electric current and voltage analog output control circuit are used to export the current-mode of 4-20mA
The voltage analog of analog quantity and/or 0-5VDC.
Preferably, the processor module is 32 high speed processors, which further includes and the processor module electricity
Property connection human-machine interface module, the human-machine interface module include 16 bit processors and respectively with 16 bit processor electricity
Property the multidigit number tube display screen of connection, operation button, data storage cell, 16 bit processor and the processor module
It is electrically connected.
A kind of Minitype digital CMOS laser displacement sensor circuit system according to the present invention, passes through two pole of semiconductor laser
Pipe constant-current drive circuit and feedback unit realize constant-current source, the Constant-power drive of laser diode, and then automatic gain control light
Brightness so that sensor keep long-term work under LED lightness consistency, it is ensured that the stability of light, improve measurement essence
Degree, so that it is guaranteed that the accuracy of measurement；
Further, the power circuit with feedback is set, by feedback signal, carries out automatic gain adjustment, exports stable electricity
Pressure, to be other all reliable working powers of circuit with stable, it is ensured that sensor circuit is not at work by extraneous wave
The influence of dynamic interference improves measurement stability；
Further, setting analog output unit realizes the output of bimodulus analog quantity and setting human-machine interface module, by having
32 high speed processors of high-speed computation ability and real-time disposal of multi-tasks ability carry out data processing, realize user's operation key
Changing setting can be completed the control of analog quantity, provide convenience for the use of user, and realize that user is not necessarily in use
The output equipment of additional single analog quantity, reduces use cost.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the system block diagram of the application Minitype digital CMOS laser displacement sensor circuit system embodiment；
Fig. 2 is the circuit diagram of constant-current control module in Fig. 1；
Fig. 3 is the circuit diagram of power module in Fig. 1；
Fig. 4 is the circuit diagram of negative supply circuit in Fig. 1；
Fig. 5 is the circuit diagram of booster power supply circuit in Fig. 1；
Fig. 6 is the circuit diagram of the switching value input circuit of On-off signal output unit in Fig. 1；
Fig. 7 is the circuit diagram of the switching value output circuit of On-off signal output unit in Fig. 1；
Fig. 8 is the circuit diagram of analog output unit in Fig. 1；
Fig. 9 is the circuit diagram of human-machine interface module in Fig. 1；
Figure 10 is the circuit diagram of the image sensing circuit in Fig. 1 built in linear CMOS image sensor；
Figure 11 is the index path that CMOS incudes optical path in Fig. 1；
Description of symbols: a- laser diode, b- condenser lens, c- glass window, d- measured object, e- bandpass filter, f-
Receive object lens, g- photosensitive element, h- reflecting mirror.
Specific embodiment
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Embodiment: a kind of Minitype digital CMOS laser displacement sensor circuit system, refering to what is shown in Fig. 1, including processor
Module, cmos image sensing module, constant-current control module, input/output module and the power supply mould for above-mentioned each module for power supply
Block.In the present embodiment, processor module selects 32 high speed processors, and selects encapsulation model QFN48's
STM32F401CBU6 chip, it is emphasized that, 32 high speed processors suitable for the present embodiment are not limited only to the model,
But 32 bit processor that those skilled in the art can obviously expect and common in the art.Cmos image
Sensing module and constant-current control module are electrically connected, constant-current control module, input/output module respectively with 32 high speed processors
In 12 adc circuits connection.
Specifically, constant-current control module includes the semiconductor laser diode perseverance being electrically connected with 32 high speed processors
Flow driving circuit and feedback unit, cmos image sensing module, semiconductor laser diode constant-current control circuit respectively with feedback
Unit is electrically connected.There are three pins for semiconductor laser diode tool, include luminescence chip LD and feedback reception chip PD, at this
In embodiment, feedback unit is used to detect the variation of the feedback reception end the chip PD detection environment of semiconductor diode, and will become
Change signal and feed back to 32 high speed processors, processor is according to the feedback signal received to the electric parameter at the end luminescence chip LD
It is adjusted, to adjust LD luminescence chip brightness, making to shine brightens or more dimmed, reaches the driving of constant-current source, invariable power.
One kind as the present embodiment is preferably carried out mode, refering to what is shown in Fig. 2, feedback unit includes sequentially connected electricity
Hinder R1, resistance R33, potentiometer VR1, resistance R13, inverting input terminal and resistance R1 connection bias current amplifier U6, with it is inclined
The resistance R10 for setting the connection of current amplifier U6 output end, feedback score the capacitor C28, resistance R1 being connect with resistance R10 and biasing
The inverting input terminal of current amplifier U6 connects, and resistance R33, potentiometer VR1, feedback score capacitor C28 and bias current amplify
Device U6 is in parallel, and the normal phase input end of bias current amplifier U6 connects reference circuit.
It is further preferred that bias current amplifier U6 includes the first amplifier U6A and the second amplifier U6B, resistance R1
It is connect with the reverse input end of the second amplifier U6B, reference circuit is connect with the normal phase input end of the second amplifier U6B, resistance
One end of R10 is connect with the output end of the second amplifier, the inverting input terminal of the other end of resistance R10 and the first amplifier U6A
Connection, feedback score capacitor C28 are in parallel with bias current amplifier U6A.
Reference circuit includes concatenated R2, R3, and the other end of R2 is powered, the other end ground connection of R3, electricity on the basis of R2, R3
Reference voltage resistance in road, provides reference voltage after energization.Feedback score capacitor C28 forms integrating circuit；VR1 is current potential
Device is finely adjusted semiconductor laser LED lightness by potentiometer VR1；The output end of feedback unit and 32 high speed processings
Device is electrically connected；The positive input of second amplifier U6B is connect with the collector terminal of PNP triode Q9；PNP triode Q9's
Emitter and basis set are electrically connected with 32 high speed processors respectively, and 32 high speed processors are by triode Q9 to semiconductor two
The light emission duty ratio of pole pipe is adjusted；The basis set of the output end connection NPN triode Q8 of first amplifier U6A, NPN triode
The emitter of Q8 is connect with the emitter of PNP triode Q7, and the basis set of PNP triode Q7 electrically connects with 32 high speed processors
It connects, the luminescence chip LD connection of the collector and semiconductor laser diode of PNP triode Q7,32 high speed processors pass through three
The digital output modul of pole pipe Q7, decides whether to plus constant-current source is to semiconductor laser diode.Constant current control through this embodiment
The setting of molding block, realizes the constant-current source Constant-power drive of laser diode truly, automatic gain control light it is bright
Degree keeps the consistency of brightness under long-term work, it is ensured that the stability of light improves precision, it is ensured that the accuracy of measurement.
In the present embodiment, the semiconductor laser diode in semiconductor laser diode constant-current control circuit, shine core
Piece LD be electrically connected through triode and 32 high speed processors carry out light emitting controls, through triode and integrating circuit be electrically connected into
Row duty cycle adjustment.
One kind as the present embodiment is preferably carried out mode, refering to what is shown in Fig. 3, power module includes sequentially connected inverse
Pole protect circuit, feed circuit, surge voltage absorbing circuit, power supply circuit, power supply circuit respectively with 32 high speeds
Processor, cmos image sensing module, constant-current control module, input/output module electric connection are powered.
In the present embodiment, inverse pole protection circuit includes and the concatenated inverse pole protection diode of power module input terminal, wave
Gushing voltage absorpting circuit includes the varistor with inverse pole protection diode connect and ground, and feed circuit includes and power supply
High-precision feedback resistance RF1, RF2 of circuit output end parallel connection.
Specifically, the main feature of power module has the input of DC12V-DC24V Width funtion, and voltage input end is in series with two poles
Pipe D6, diode D6 realize that power input polarity is inverse and connect protection.And ground connection in parallel with diode D6 is provided with varistor R54,
Input surge voltage absorbing circuit is constituted by the varistor of such setting.Feed circuit is by being arranged high-precision in circuit
Feedback resistance RF1, RF2 are constituted, and when output voltage fluctuation, feed back to the chip U1(of power module it should be noted that U1 is
The chip for the power circuit that those skilled in the art can obviously expect), automatic gain adjustment is carried out, thus output one
Stable 5VDC voltage.The power module with feed circuit being arranged through this embodiment realizes the automatic increasing of supply voltage
Benefit adjustment, is the reliable working power of circuit with stable of modules in system, so that each module is not at work by outer
The influence of boundary's fluctuation interference, while power consumption is reduced, improve measurement stability.
One kind as the present embodiment is preferably carried out mode, refering to what is shown in Fig. 1, input/output module includes surge absoption
Circuit, inverse connect of output protect circuit, current foldback circuit, On-off signal output unit, negative supply circuit, booster power electricity
Road, Analog control circuit and analog output unit, wherein surge absorbing circuit, inverse connect of output protect circuit, overcurrent protection
Circuit, On-off signal output unit are sequentially connected, and On-off signal output unit and 32 high speed processors are electrically connected, mould
Analog quantity control circuit is electrically connected with negative supply circuit, booster power supply circuit and analog output unit respectively, surge absoption
Circuit, negative supply circuit, booster power supply circuit are electrically connected with power module respectively.
Specifically, refering to what is shown in Fig. 4, the output end of the input terminal of negative supply circuit and power module connects, input+
5VDC voltage, the generation -5VDC negative voltage after processing of circuit provide negative supply for single supply analogue chip, meet simulation
Measure output function；Refering to what is shown in Fig. 5, the input terminal of booster power supply circuit and the output end of power module connect, input+5VDC electricity
Pressure exports the voltage for being higher than+5VDC, in the present embodiment, the output voltage of booster power supply circuit after processing of circuit
For the voltage of+11VDC ,+11VDC the voltage that booster power supply circuit generates is to export to provide power supply to current-mode analog quantity, meets it
4-20mA exports electric current, 300 Europe load impedance technical requirements.
In the present embodiment, On-off signal output unit include switching value input circuit as shown in FIG. 6 and with switch
Measure input circuit connection switching value output circuit, switching value output circuit respectively with surge voltage absorbing circuit and 32 high speeds
Processor is electrically connected.Refering to what is shown in Fig. 7, R22, R20, NPN triode Q3, R15, R16, R39 constitute output short circuit protection
Circuit leads to voltage hurried raising in the upper end R22 when output short-circuit, feeds back to through R20, NPN triode Q3, R15, R16, R39
32 high speed processors close output；Diode D2 output is inverse to connect protection, and diode D3 exports surge voltage protection.
In the present embodiment, refering to what is shown in Fig. 8, analog output unit is electric current and voltage analog output control electricity
Road can export the current-mode analog quantity of 4-20mA and/or the voltage analog of 0-5VDC by the control of Analog control unit
Amount.
Specifically, the input terminal VEE of analog output unit connect respectively with the output end of negative supply circuit, VDD with
The output end of booster power supply circuit connects, and the input voltage at the end VEE is -5VDC voltage, and the input voltage of vdd terminal is+11VDC electricity
Pressure, VEE and VDD are connected with bilateral diode D5, the unilateral diode D7 of ground connection and inductance L3, D5, D7, L3 in output electric current
It shields respectively when analog quantity and voltage analog, prevents the interference of voltage fluctuation.
One kind as the present embodiment is preferably carried out mode, refering to what is shown in Fig. 9, the system further include with 32 high speed at
The human-machine interface module that device is electrically connected is managed, human-machine interface module is electrical with 16 bit processors including 16 bit processors and respectively
Multidigit number tube display screen, operation button, the data storage cell of connection, 16 bit processors electrically connect with 32 high speed processors
It connects.
Specifically, human-machine interface module is controlled using independent microprocessor, is configured with multiple LED lights, 7 sections of multidigit
LED charactrons and key.It is shown by LED charactrons completion digital alphabet symbol and the key of hommization operation, cooperation has
Multitask carries out 32 high speed processors of ability simultaneously, realizes multi-mode, the multifunctional performance of sensor.
In the present embodiment, cmos image sensing module includes that sequentially connected linear CMOS image sensor, signal are put
The input terminal of big circuit, high-speed ADC D/A converting circuit, linear CMOS image sensor is connect with CMOS induction optical path, high speed
ADC D/A converting circuit and feedback unit are electrically connected.Shown in Fig. 10 is linear CMOS image sensor in the present embodiment
Image sensing circuit, the circuit are that those skilled in the art is obvious or browse art technology file and can be readily available
Content, will not repeat them here its specific structure.It should be understood that the present embodiment is not limited only to using shown in Figure 10
Image sensing circuit and Figure 11 shown in incude optical path, applying also for other those skilled in the art can be obvious
And image sensing circuit common in the art and CMOS incude optical path.In the present embodiment, laser a, which is issued, swashs
Light passes through window glass c after focusing by condenser lens b and is irradiated on measured object d, and laser emits on measured object d, hair
Laser after penetrating enters sensor internal after passing through bandpass filter e, and passes through image-forming objective lens f, and laser irradiation is in photosensitive element g
On, fraction of laser light generates on photosensitive element g to be emitted and is reflected back on photosensitive element g by reflecting element h.
Working principle: in the use process of sensor, the feedback reception chip PD of semiconductor laser diode is examined in real time
Survey the operating power of semiconductor laser diode；When detect semiconductor laser diode when having the decaying of power (such as
When may changing with luminescence chip LD brightness caused by temperature or other situations), feedback reception chip PD connects
The light received also changes, which is fed back to 32 high speed processors by feedback unit, and 32 high speed processors pass through tune
The voltage of the emitter and basis set that save PNP triode Q9 adjusts PNP triode Q7 to adjust the duty ratio of luminescence chip LD, pass through
Basis set voltage to control whether to increase constant-current source to semiconductor laser diode and by adjusting potentiometer VR1 to partly leading
Volumetric laser LED lightness is finely adjusted, so that the electric current to semiconductor laser diode is changed, further makes to shine
The brightness of chip LD is completed to adjust (brightening or dimmed), reaches the driving of constant-current source invariable power, improves in detection process and electrical
The stability of element improves detection accuracy.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of Minitype digital CMOS laser displacement sensor circuit system, including processor module, cmos image sensing module,
Constant-current control module, input/output module and the power module for above each module for power supply, the cmos image sensing module
With the constant-current control module be electrically connected, the constant-current control module, the input/output module respectively with the processor
Module is electrically connected, which is characterized in that the constant-current control module includes the semiconductor being electrically connected with the processor module
Laser diode constant-current drive circuit and feedback unit, the cmos image sensing module, the semiconductor laser diode are permanent
Flow control circuit is electrically connected with the feedback unit respectively.
2. Minitype digital CMOS laser displacement sensor circuit system according to claim 1, which is characterized in that described anti-
Feedback unit includes that sequentially connected resistance R1, resistance R33, potentiometer VR1, resistance R13, inverting input terminal and the resistance R1 connect
The bias current amplifier U6 connect, the resistance R10 and the resistance R10 that are connect with the bias current amplifier U6 output end
The feedback score capacitor C28 of connection, the resistance R1 are connect with the inverting input terminal of the bias current amplifier U6, the electricity
It is in parallel with the bias current amplifier U6 to hinder R33, the potentiometer VR1, the feedback score capacitor C28, the biased electrical
The normal phase input end of stream amplifier U6 connects reference circuit.
3. Minitype digital CMOS laser displacement sensor circuit system according to claim 2, which is characterized in that described inclined
Setting current amplifier U6 includes the first amplifier U6A and the second amplifier U6B, the resistance R1 and the second amplifier U6B
Reverse input end connection, the reference circuit connect with the normal phase input end of the second amplifier U6B, the resistance R10
One end connect with the output end of the second amplifier U6B, the other end of the resistance R10 and the first amplifier U6A
Inverting input terminal connection, the feedback score capacitor C28 is in parallel with the first amplifier U6A.
4. Minitype digital CMOS laser displacement sensor circuit system according to claim 1, which is characterized in that described half
The luminescence chip LD of semiconductor laser diode in conductor Laser diode constant-current control circuit is through triode and the processing
Device module is electrically connected and carries out light emitting control, is electrically connected progress duty cycle adjustment through triode and the feedback unit.
5. Minitype digital CMOS laser displacement sensor circuit system according to claim 1, which is characterized in that the electricity
The feed circuit that source module includes power supply circuit, is connect with the power supply circuit output end.
6. Minitype digital CMOS laser displacement sensor circuit system according to claim 5, which is characterized in that described anti-
Current feed circuit include the high-precision feedback resistance RF1 being connected in series between the power supply circuit output terminal and ground terminal,
RF2。
7. Minitype digital CMOS laser displacement sensor circuit system according to claim 1, which is characterized in that described defeated
Entering output module includes analog output unit, and the analog output unit is electric current and voltage analog output control electricity
Road, the electric current and voltage analog output control circuit are used to export the current-mode analog quantity of 4-20mA and/or the electricity of 0-5VDC
Pressing mold analog quantity.
8. Minitype digital CMOS laser displacement sensor circuit system according to claim 1, which is characterized in that the place
Reason device module is 32 high speed processors, which further includes the human-machine interface module being electrically connected with the processor module,
The human-machine interface module include 16 bit processors, respectively with 16 bit processor be electrically connected multidigit nixie tube show
Screen, operation button, data storage cell, 16 bit processor and the processor module are electrically connected.
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| CN201910198945.1A CN109883335A (en) | 2019-03-15 | 2019-03-15 | A kind of Minitype digital CMOS laser displacement sensor circuit system |
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| CN201910198945.1A CN109883335A (en) | 2019-03-15 | 2019-03-15 | A kind of Minitype digital CMOS laser displacement sensor circuit system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112097910A (en) * | 2019-06-17 | 2020-12-18 | 广州市合熠电子科技有限公司 | Intelligent RGB digital color sensor circuit system |
| CN114383514A (en) * | 2021-12-30 | 2022-04-22 | 广州市合熠智能科技股份有限公司 | CMOS contact displacement sensor and measuring method |
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