CN209399932U - A kind of Minitype digital CMOS laser displacement sensor circuit system - Google Patents

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.The Minitype digital CMOS laser displacement sensor circuit system of the utility model, 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

A kind of Minitype digital CMOS laser displacement sensor circuit system

Technical field

The utility model relates to displacement sensor circuit systems technology field, specifically a kind of Minitype digital CMOS laser position Displacement 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.

Utility model content

Purpose of the utility model is to solve the above problems and provide a kind of Minitype digital CMOS laser displacement sensors Circuit system can be realized on photosensitive element by the cooperation of semiconductor laser diode constant-current drive circuit and feedback unit The automatic gain control of brightness, it is ensured that the stability of light improves measurement accuracy and testing result accuracy.

To achieve the above object, the utility model provides a kind of Minitype digital CMOS laser displacement sensor circuit system System, including processor module, cmos image sensing module, constant-current control module, input/output module and be above each module The power module of power supply, the cmos image sensing module and the constant-current control module are electrically connected, the current constant control mould Block, the input/output module are electrically connected with the processor module respectively, and the constant-current control module includes and the place Semiconductor laser diode constant-current drive circuit and feedback unit that device module is electrically connected are managed, the cmos image senses mould Block, the semiconductor laser diode constant-current control circuit are 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 utility model, passes through semiconductor laser Diode constant-current drive circuit and feedback unit realize constant-current source, the Constant-power drive of laser diode, and then automatic gain tune The brightness of light is saved, so that sensor keeps the consistency of LED lightness under long-term work, it is ensured that the stability of light improves measurement Precision, 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, output is stablized Voltage, thus be other all reliable working powers of circuit with stable, it is ensured that sensor circuit is not at work by outer The influence of boundary's fluctuation interference, improves measurement stability；

Further, setting analog output unit realizes the output of bimodulus analog quantity and setting human-machine interface module, passes through 32 high speed processors with high-speed computation ability and real-time disposal of multi-tasks ability carry out data processing, realize user's operation Key change sets the control that analog quantity can be completed, and provides convenience for the use of user, and realizes in use, user Without the output equipment of additional single analog quantity, use cost is reduced.

Detailed description of the invention

The attached drawing constituted part of this application is used to provide a further understanding of the present invention, the utility model Illustrative embodiments and their description are not constituteed improper limits to the present invention for explaining the utility model.In attached drawing In:

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 Piece, f- receive object lens, g- photosensitive element, h- reflecting mirror.

Specific embodiment

The utility model 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 above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.

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.