CN105136174A - Digitalized photoelectric detection system based on linear modulation and demodulation circuit - Google Patents
Digitalized photoelectric detection system based on linear modulation and demodulation circuit Download PDFInfo
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- CN105136174A CN105136174A CN201510471764.3A CN201510471764A CN105136174A CN 105136174 A CN105136174 A CN 105136174A CN 201510471764 A CN201510471764 A CN 201510471764A CN 105136174 A CN105136174 A CN 105136174A
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Abstract
The invention discloses a digitalized photoelectric detection system based on a linear modulation and demodulation circuit, and the system consists of a light source (1), a digital light-sensing module (4), a filter (2) connected with the light source (1), a receiving module (3) connected with the filter (2), and a CPU (5) connected with the digital light-sensing module (4). The system is characterized in that a linear modulation and demodulation module (6) is disposed between the digital light-sensing module (4) and the receiving module (3); According to the invention, the system achieves the digitalized transmission and processing of a detection signal, so the system can reduce the interference noises, generated during the processing or transmission of the signal, to a great extent, prevents a usable signal from interfering with a noise signal, and effectively improves the detection efficiency. Meanwhile, the system is high in signal transmission linearity, and prevents the transmission interruption of the signal from affecting the detection efficiency of the system.
Description
Technical field
The present invention relates to a kind of photodetector system, specifically refer to the digital photoelectric detection system based on linear modulation demodulator circuit.
Background technology
In automatic on-line detecting system, be divided into Systems for optical inspection and the large class of electrochemical detection system two.Compared with Electrochemical Detection, the method for Photoelectric Detection is non-contact detecting, does not need to contact with corrosive detection liquid, facilitates the maintenance work of instrument, extend the serviceable life of detecting device.Therefore, Photoelectric Detection is widely used in the middle of commercial production.
Photoelectric Detection mainly converts corresponding electrical signal intensity to the signal intensity of light, is calculated the various parameters of object to be detected by the change of photovoltage value.But traditional photodetector system its in use well can not carry out linear transmission and process to detection signal, thus reduce the accuracy of detection of photodetector system.Therefore the linearity how improving photodetector system is then the current task of top priority.
Summary of the invention
The object of the invention is to overcome its detection signal of traditional photodetector system defect that the linearity is low when transmitting and process, a kind of digital photoelectric detection system based on linear modulation demodulator circuit is provided.
Object of the present invention is achieved through the following technical solutions: based on the digital photoelectric detection system of linear modulation demodulator circuit, by light source, numeral illuminant module, the optical filter be connected with light source, the receiver module be connected with optical filter, the CPU be connected with digital illuminant module, and the linear modulation demodulation module be arranged between digital illuminant module and receiver module forms.
Further, described linear modulation demodulation module is by Sheffer stroke gate A1, Sheffer stroke gate A2, Sheffer stroke gate A3, triode VT1, N pole is connected with the base stage of triode VT1, P pole is then in turn through resistance R11, the diode D4 of ground connection after potentiometer R10 and resistance R13, be serially connected in the resistance R16 between the base stage of triode VT1 and the output terminal of Sheffer stroke gate A3, be serially connected in the electric capacity C7 between the output terminal of Sheffer stroke gate A1 and the collector of triode VT1, the diode D3 be in parallel with electric capacity C7, be serially connected in the electric capacity C6 between the positive pole of Sheffer stroke gate A1 and output terminal, the resistance R12 be in parallel with electric capacity C6, one end is connected with the output terminal of Sheffer stroke gate A1, the resistance R14 that the other end is then connected with the positive pole of Sheffer stroke gate A2, and one end is connected with the positive pole of Sheffer stroke gate A2, the potentiometer R15 that the other end then forms the output terminal of this linear modulation demodulation module together with the positive pole of Sheffer stroke gate A3 forms, the negative pole of described Sheffer stroke gate A1 is connected with the control end of potentiometer R10, the positive pole of Sheffer stroke gate A2 is connected with the control end of potentiometer R15, its minus earth, output terminal are then connected with the negative pole of Sheffer stroke gate A3, form the input end of this linear modulation demodulation module together with the tie point of resistance R13 with resistance R10 while the emitter of described triode VT1 is connected with the P pole of diode D4.
Described digital illuminant module is by conversion chip U, be serially connected in the resistance R5 between the VS pin of conversion chip U and R/C pin, be serially connected in the polar capacitor C2 between the F.O pin of conversion chip U and C.O pin, the potentiometer R3, differentiating circuit, bleeder circuit and the amplifying circuit that are connected with conversion chip U, and the rectification filtering voltage stabilizing circuit be connected with amplifying circuit forms.
Described differentiating circuit comprises electric capacity C1 and resistance R1; The negative pole of this electric capacity C1 is connected with the VS pin of conversion chip U after resistance R1; One end of described potentiometer R3 forms the input end of this digital illuminant module together with the positive pole of electric capacity C1, its other end is then connected with the C.R pin of conversion chip U; The VS pin of described conversion chip U connects 12V voltage, and its THRE pin is then connected with the negative pole of electric capacity C1, and its C.R pin is also connected with the control end of potentiometer R3.
Described bleeder circuit comprises resistance R2 and resistance R4; One end ground connection, its other end of this resistance R2 are then connected with the VS pin of conversion chip U after resistance R4; The COMP pin of described conversion chip U is then connected with the tie point of resistance R4 with resistance R2.
Described amplifying circuit is by amplifier P, triode VT, be serially connected in the electric capacity C4 between the positive pole of amplifier P and output terminal, be serially connected in the resistance R6 between the positive pole of amplifier P and the emitter of triode VT, be serially connected in the resistance R7 between the emitter of triode VT and the output terminal of amplifier P, and the polar capacitor C3 that positive pole is connected with the R/C pin of conversion chip U, negative pole is then connected with the collector of triode VT forms; The base stage of described triode VT is connected with the C.O pin of conversion chip U, its collector is then connected with rectification filtering voltage stabilizing circuit; While the negative pole of described amplifier P is connected with the GND pin of conversion chip U, ground connection, its output terminal are then connected with rectification filtering voltage stabilizing circuit.
Described rectification filtering voltage stabilizing circuit is by diode rectifier U1, voltage stabilizing chip U2, one end is connected with the GND pin of voltage stabilizing chip U2, the potentiometer R8 of other end ground connection, negative pole is connected with the cathode output end of diode rectifier U1, positive pole then in turn through the electric capacity C5 that diode D1 is connected with the control end of potentiometer R8 after diode D2, and the resistance R9 that one end is connected with the OUT pin of voltage stabilizing chip U2, the other end is then connected with the cathode output end of diode rectifier U1 forms; Two input poles of described diode rectifier U1 are connected with the output terminal of amplifier P with the negative pole of polar capacitor C3 respectively, and its cathode output end is then connected with the IN pin of voltage stabilizing chip U2; The OUT pin of voltage stabilizing chip U2 is connected with the tie point of diode D2 with diode D1; The cathode output end of this diode rectifier U1 then forms the output terminal of this digital illuminant module together with the OUT pin of voltage stabilizing chip U2.
Described conversion chip U is preferably LM331 integrated chip, and voltage stabilizing chip U2 then preferentially selects W317 integrated chip to realize.
The present invention comparatively prior art compares, and has the following advantages and beneficial effect:
(1) detection signal of the present invention adopts Digital Transmission and process, therefore can reduce to a great extent signal process or transmitting procedure in produce interference noise, avoid useful signal and interference noise to obscure mutually, thus effectively raise accuracy of detection of the present invention.
(2) Signal transmissions of the present invention is linearly spent high, avoids occurring in the process of Signal transmissions interrupting and affecting its accuracy of detection.
(3) structure of the present invention is simple, and volume is little, and applicability is stronger.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention.
Fig. 2 is digital illuminant module electrical block diagram of the present invention.
Fig. 3 is linear modulation demodulation module electrical block diagram of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, digital photoelectric detection system based on linear modulation demodulator circuit of the present invention, by light source 1, numeral illuminant module 4, the optical filter 2 be connected with light source 1, the receiver module 3 be connected with optical filter 2, the CPU5 be connected with digital illuminant module 4, and the linear modulation demodulation module 6 be arranged between digital illuminant module 4 and receiver module 3 forms.
Wherein, light source 1 detects objective emission light beam for continual giving, and it can adopt light emitting diode or laser diode to realize.Receiver module 3 then for receiving the light beam that detected target reflects, and is analyzed light beam, and confirm that whether the light beam that reflects is the light beam that light source 1 sends, it can adopt photodiode or phototriode to realize.In the present embodiment, light source 1 and receiver module 3 are not ground altogether, namely therebetween without the contact of electricity, so then can improve interference free performance of the present invention.
In addition, this optical filter 2 filters for the light beam reflected target, makes it become monochromatic light, and so then make receiver module 3 can better receive the light beam reflected, it can preferentially adopt bandpass-type optical filter to realize.Linear modulation demodulation module 6 can be linear detection signal is processed.Numeral illuminant module 4 for photosignal is converted into digital electric signal, and is transferred to CPU and carries out computing.In the specific implementation, this receiver module 3 and CPU5 all adopt prior art to realize.
As shown in Figure 2, it is by conversion chip U, resistance R5, polar capacitor C2, potentiometer R3, differentiating circuit, bleeder circuit for the structure of described digital illuminant module 4, amplifying circuit and rectification filtering voltage stabilizing circuit composition.
This conversion chip U can become digital electric signal photoelectric signal transformation, it preferentially adopts LM331 integrated chip to realize, this model integrated chip built-in temperature compensates bandgap power supply, there is very high conversion accuracy and temperature stability, and the feature such as frequency adaptation wide ranges, the linearity are good, peripheral circuit is simple.
Wherein, resistance R5 is serially connected between the VS pin of conversion chip U and R/C pin, and polar capacitor C2 is then serially connected between the F.O pin of conversion chip U and C.O pin.
After signal input is come in, this differentiating circuit produces a negative spike pulse and is added on the VS pin of conversion chip U, thus triggers conversion chip U work.This differentiating circuit comprises electric capacity C1 and resistance R1.The negative pole of electric capacity C1 is connected with the VS pin of conversion chip U after resistance R1; Meanwhile, one end of potentiometer R3 forms the input end of this digital illuminant module 4 together with the positive pole of electric capacity C1, its other end is then connected with the C.R pin of conversion chip U.
Described bleeder circuit can carry out dividing potential drop to operating voltage, thus protection conversion chip U is not damaged by superpotential, and it comprises resistance R2 and resistance R4; One end ground connection, its other end of this resistance R2 are then connected with the VS pin of conversion chip U after resistance R4.
In order to make conversion chip U better work, its VS pin connects 12V voltage, and THRE pin is then connected with the negative pole of electric capacity C1, and its C.R pin is also connected with the control end of potentiometer R3, and COMP pin is then connected with the tie point of resistance R4 with resistance R2.
In order to obtain more stable digital electric signal, the digital electric signal exported from conversion chip U need process through amplifying circuit and rectification filtering voltage stabilizing circuit.Therefore, this amplifying circuit need be connected with the output terminal of conversion chip U, and its concrete structure includes amplifier P, triode VT, polar capacitor C3, resistance R6, resistance R7 and electric capacity C4.
During connection, between the positive pole that this electric capacity C4 is serially connected in amplifier P and output terminal, resistance R6 is then serially connected between the positive pole of amplifier P and the emitter of triode VT, resistance R7 is serially connected between the emitter of triode VT and the output terminal of amplifier P, and the positive pole of polar capacitor C3 is connected with the R/C pin of conversion chip U, its negative pole is then connected with the collector of triode VT.
Meanwhile, the base stage of this triode VT need be connected with the C.O pin of conversion chip U, its collector is then connected with rectification filtering voltage stabilizing circuit.While the negative pole of described amplifier P is connected with the GND pin of conversion chip U, ground connection, its output terminal are then connected with rectification filtering voltage stabilizing circuit.Therefore, the digital electric signal after amplifying can be input to rectification filtering voltage stabilizing circuit and process.
This rectification filtering voltage stabilizing circuit is then by diode rectifier U1, voltage stabilizing chip U2, one end is connected with the GND pin of voltage stabilizing chip U2, the potentiometer R8 of other end ground connection, negative pole is connected with the cathode output end of diode rectifier U1, positive pole then in turn through the electric capacity C5 that diode D1 is connected with the control end of potentiometer R8 after diode D2, and the resistance R9 that one end is connected with the OUT pin of voltage stabilizing chip U2, the other end is then connected with the cathode output end of diode rectifier U1 forms.
Concrete, two input poles of this diode rectifier U1 are connected with the output terminal of amplifier P with the negative pole of polar capacitor C3 respectively, and its cathode output end is then connected with the IN pin of voltage stabilizing chip U2.The OUT pin of voltage stabilizing chip U2 is connected with the tie point of diode D2 with diode D1.The cathode output end of this diode rectifier U1 then forms the output terminal of this digital illuminant module 4 together with the OUT pin of voltage stabilizing chip U2.In order to reach better voltage regulation result, described voltage stabilizing chip U2 preferentially adopts W317 integrated chip to realize.
As shown in Figure 3, it comprises Sheffer stroke gate A1 to the structure of linear modulation demodulation module 6, Sheffer stroke gate A2, Sheffer stroke gate A3, triode VT1, potentiometer R10, resistance R11, resistance R12, resistance R13, resistance R14, potentiometer R15, resistance R16, electric capacity C6, electric capacity C7, diode D3 and diode D4 form.
Wherein, electric capacity C6 and resistance R12 forms RC wave filter, and its concrete structure is: electric capacity C6 is serially connected between the positive pole of Sheffer stroke gate A1 and output terminal, and resistance R12 is then in parallel with electric capacity C6.
Sheffer stroke gate A2, Sheffer stroke gate A3, resistance R16 and potentiometer R15 forms a sign-changing amplifier, and it oppositely can amplify process to detection signal.In order to produce a desired effect, the positive pole of this Sheffer stroke gate A2 forms the output terminal of this linear modulation demodulation module 6, its minus earth after potentiometer R15 together with the positive pole of Sheffer stroke gate A3, and its output terminal is then connected with the negative pole of Sheffer stroke gate A3; The positive pole of this Sheffer stroke gate A2 is also connected with the control end of potentiometer R15, and the output terminal of Sheffer stroke gate A3 is then connected with the base stage of triode VT1 after resistance R16.
Simultaneously, the N pole of this diode D4 is connected with the base stage of triode VT1, its P pole then ground connection after resistance R11, potentiometer R10 and resistance R13 in turn, electric capacity C7 is then serially connected between the output terminal of Sheffer stroke gate A1 and the collector of triode VT1, diode D3 is then in parallel with electric capacity C7, and one end of resistance R14 is connected with the output terminal of Sheffer stroke gate A1, its other end is then connected with the positive pole of Sheffer stroke gate A2.The negative pole of described Sheffer stroke gate A1 is connected with the control end of potentiometer R10.Form the input end of this linear modulation demodulation module 6 together with the tie point of resistance R13 with resistance R10 while the emitter of described triode VT1 is connected with the P pole of diode D4.In the present embodiment, this potentiometer R10 is as gamma correction potentiometer, and the resistance of adjustment potentiometer R10 can well bucking-out system non-linear.
As mentioned above, just the present invention can well be realized.
Claims (8)
1. based on the digital photoelectric detection system of linear modulation demodulator circuit, by light source (1), numeral illuminant module (4), the optical filter (2) be connected with light source (1), the receiver module (3) be connected with optical filter (2), and the CPU (5) be connected with digital illuminant module (4) forms, it is characterized in that, between digital illuminant module (4) and receiver module (3), be also provided with linear modulation demodulation module (6), described linear modulation demodulation module (6) is by Sheffer stroke gate A1, Sheffer stroke gate A2, Sheffer stroke gate A3, triode VT1, N pole is connected with the base stage of triode VT1, P pole is then in turn through resistance R11, the diode D4 of ground connection after potentiometer R10 and resistance R13, be serially connected in the resistance R16 between the base stage of triode VT1 and the output terminal of Sheffer stroke gate A3, be serially connected in the electric capacity C7 between the output terminal of Sheffer stroke gate A1 and the collector of triode VT1, the diode D3 be in parallel with electric capacity C7, be serially connected in the electric capacity C6 between the positive pole of Sheffer stroke gate A1 and output terminal, the resistance R12 be in parallel with electric capacity C6, one end is connected with the output terminal of Sheffer stroke gate A1, the resistance R14 that the other end is then connected with the positive pole of Sheffer stroke gate A2, and one end is connected with the positive pole of Sheffer stroke gate A2, the potentiometer R15 that the other end then forms the output terminal of this linear modulation demodulation module (6) together with the positive pole of Sheffer stroke gate A3 forms, the negative pole of described Sheffer stroke gate A1 is connected with the control end of potentiometer R10, the positive pole of Sheffer stroke gate A2 is connected with the control end of potentiometer R15, its minus earth, output terminal are then connected with the negative pole of Sheffer stroke gate A3, form the input end of this linear modulation demodulation module (6) together with the tie point of resistance R13 with resistance R10 while the emitter of described triode VT1 is connected with the P pole of diode D4.
2. the digital photoelectric detection system based on linear modulation demodulator circuit according to claim 1, it is characterized in that: described digital illuminant module (4) is then by conversion chip U, be serially connected in the resistance R5 between the VS pin of conversion chip U and R/C pin, be serially connected in the polar capacitor C2 between the F.O pin of conversion chip U and C.O pin, the potentiometer R3, differentiating circuit, bleeder circuit and the amplifying circuit that are connected with conversion chip U, and the rectification filtering voltage stabilizing circuit be connected with amplifying circuit forms.
3. the digital photoelectric detection system based on linear modulation demodulator circuit according to claim 2, is characterized in that: described differentiating circuit comprises electric capacity C1 and resistance R1; The negative pole of this electric capacity C1 is connected with the VS pin of conversion chip U after resistance R1; One end of described potentiometer R3 forms the input end of this digital illuminant module (4) together with the positive pole of electric capacity C1, its other end is then connected with the C.R pin of conversion chip U; The VS pin of described conversion chip U connects 12V voltage, and its THRE pin is then connected with the negative pole of electric capacity C1, and its C.R pin is also connected with the control end of potentiometer R3.
4. the digital photoelectric detection system based on linear modulation demodulator circuit according to claim 3, is characterized in that: described bleeder circuit comprises resistance R2 and resistance R4; One end ground connection, its other end of this resistance R2 are then connected with the VS pin of conversion chip U after resistance R4; The COMP pin of described conversion chip U is then connected with the tie point of resistance R4 with resistance R2.
5. the digital photoelectric detection system based on linear modulation demodulator circuit according to claim 4, it is characterized in that: described amplifying circuit is by amplifier P, triode VT, be serially connected in the electric capacity C4 between the positive pole of amplifier P and output terminal, be serially connected in the resistance R6 between the positive pole of amplifier P and the emitter of triode VT, be serially connected in the resistance R7 between the emitter of triode VT and the output terminal of amplifier P, and the polar capacitor C3 that positive pole is connected with the R/C pin of conversion chip U, negative pole is then connected with the collector of triode VT forms; The base stage of described triode VT is connected with the C.O pin of conversion chip U, its collector is then connected with rectification filtering voltage stabilizing circuit; While the negative pole of described amplifier P is connected with the GND pin of conversion chip U, ground connection, its output terminal are then connected with rectification filtering voltage stabilizing circuit.
6. the digital photoelectric detection system based on linear modulation demodulator circuit according to claim 5, it is characterized in that: described rectification filtering voltage stabilizing circuit is by diode rectifier U1, voltage stabilizing chip U2, one end is connected with the GND pin of voltage stabilizing chip U2, the potentiometer R8 of other end ground connection, negative pole is connected with the cathode output end of diode rectifier U1, positive pole is then in turn through electric capacity C5 that diode D1 is connected with the control end of potentiometer R8 after diode D2, and one end is connected with the OUT pin of voltage stabilizing chip U2, the resistance R9 that the other end is then connected with the cathode output end of diode rectifier U1 forms, two input poles of described diode rectifier U1 are connected with the output terminal of amplifier P with the negative pole of polar capacitor C3 respectively, and its cathode output end is then connected with the IN pin of voltage stabilizing chip U2, the OUT pin of voltage stabilizing chip U2 is connected with the tie point of diode D2 with diode D1, the cathode output end of this diode rectifier U1 then forms the output terminal of this digital illuminant module (4) together with the OUT pin of voltage stabilizing chip U2.
7. the digital photoelectric detection system based on linear modulation demodulator circuit according to any one of claim 2 ~ 6, is characterized in that: described conversion chip U is LM331 integrated chip.
8. the digital photoelectric detection system based on linear modulation demodulator circuit according to claim 6, is characterized in that: described voltage stabilizing chip U2 is W317 integrated chip.
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