CN220170355U - Program controlled gain type photoelectric detector - Google Patents
Program controlled gain type photoelectric detector Download PDFInfo
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- CN220170355U CN220170355U CN202321080919.7U CN202321080919U CN220170355U CN 220170355 U CN220170355 U CN 220170355U CN 202321080919 U CN202321080919 U CN 202321080919U CN 220170355 U CN220170355 U CN 220170355U
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Abstract
The program-controlled gain type photoelectric detector is characterized in that a front-end bias voltage detector is arranged in the light emergent direction of a laser, the output end of the front-end bias voltage detector is electrically connected with the input end of a transimpedance circuit module, the output end of the transimpedance circuit module is electrically connected with the input end of a lower computer, and the lower computer and an upper computer are in communication through a USB serial port; the device has the advantages of high cost performance, large dynamic range, simple and convenient use method, convenient transformation and the like, and can be used in various photoelectric detection fields.
Description
Technical Field
The utility model belongs to the technical field of optics, and particularly relates to a program-controlled gain type photoelectric detector.
Background
Photodetectors are widely used in various fields of photodetection. In particular, in the field of visible light detection, such a photodetection instrument is very important, since the dynamic range and volume of the photodetection directly determine the dynamic range and applicable scene of the instrument.
The types of photodetectors currently in common use in the market can be broadly divided into: bias detector + fixed gain transimpedance amplifier, photodiode probe + dedicated amplifier, fixed gain detector, balanced detector and optical power meter etc.. These products are generally expensive and have a relatively single applicable scenario, such as fixed gain detectors and balanced detectors, which are typically used for optical communications, but have a small dynamic range and cannot be used for large dynamic range photo-electric sensing. The photodiode with large dynamic range, the special amplifier and the optical power meter cannot overcome the problem that the large volume has requirements on application scenes. There is a need for a photodetection product that balances the price volume and the contradictory relationship between dynamic range and accuracy.
Disclosure of Invention
The utility model aims to solve the technical problem of overcoming the defects of the prior art and providing the program-controlled gain type photoelectric detector which has the advantages of reasonable design, simple structure, large dynamic range and high precision.
The technical scheme adopted for solving the technical problems is as follows: a program-controlled gain type photoelectric detector is characterized in that a front-end bias voltage detector is arranged in the light emergent direction of a laser, the output end of the front-end bias voltage detector is electrically connected with the input end of a transimpedance circuit module, the output end of the transimpedance circuit module is electrically connected with the input end of a lower computer, and the lower computer and an upper computer are in communication through a USB serial port.
The transimpedance circuit module is formed by connecting a switch circuit, a negative feedback gain circuit and a transimpedance amplifying circuit.
The switching circuit of the utility model is as follows: the 1 foot, the 2 foot, the 15 foot and the 16 foot of the analog switch U1 are respectively connected with the 1 foot, the 2 foot, the 4 foot and the 3 foot of the connector H1, the 3 foot and the 14 foot of the analog switch U1 are grounded, the 4-7 foot and the 9-12 foot are connected with a negative feedback gain circuit, the 8 foot is connected with a transimpedance amplifying circuit and the 13 foot is connected with a power supply, and the model of the analog switch U1 is ADG1408YRUZ-REEL.
The negative feedback gain circuit of the utility model is as follows: one end of the resistor R1 and one end of the resistor R3 are connected with one end of the resistor R2, the other end of the resistor R3 is connected with the 4 pin of the analog switch U1, the other end of the resistor R1 is connected with one end of the resistor R5, the other end of the resistor R5 is connected with one end of the resistor R4 and one end of the resistor R6, the other end of the resistor R6 is connected with the 5 pin of the analog switch U1 after being connected in parallel, one end of the resistor R7-resistor R12 is connected with the 2 pin of the connector H2, the other end of the resistor R2 and the other end of the resistor R4 are respectively connected with the 6 pin and the 7 pin of the analog switch U1 and the 12-9 pin, the other end of the resistor R1 and one end of the resistor R5 are connected with the 2 pin of the connector H2, and the 1 pin of the connector H2 is grounded, and the 2 pin is connected with the transimpedance amplifying circuit.
The transimpedance amplifying circuit of the utility model is as follows: one end of a 2-pin capacitor C2 of the integrated circuit U2 is grounded through a resistor R13, the 4-pin capacitor C2 is grounded through a resistor R14, the 1-pin capacitor C2 is connected with the negative electrode of a diode ZD1 in parallel, the 8-pin capacitor C1 is connected with the other end of the power supply in parallel, the other end of the capacitor C2 is connected with the 8-pin of an analog switch U1, the other end of the capacitor C1 is grounded, the positive electrode of the diode ZD1 is grounded and connected with the 2-pin of a connector H3, the 1-pin of the connector H1 is connected with the 1-pin of the integrated circuit U2, and the model of the integrated circuit U2 is OPA2380AIDGKR.
The relation between the transimpedance gain and the output voltage in the transimpedance circuit module is as follows:
wherein Gain is the transimpedance Gain factor, P (λ) is the input optical power, and R (λ) is the bias detector current responsivity.
The effective range of the input optical power P (λ) of the present utility model is: 3 nW-10 mW.
The acceptable voltage range of the output voltage of the transimpedance circuit module 3 collected by the A/D collection module of the lower computer is 0.10V-3.30V.
The transimpedance circuit module is electrically connected with the universal meter for verification.
Compared with the prior art, the utility model has the following advantages:
1. compared with the products such as the photodiode, the special amplifier, the optical power meter and the like, the cost of the utility model is lower.
2. Compared with products such as a bias voltage detector, a fixed gain transimpedance amplifier, a fixed gain detector and the like, the dynamic range of the utility model is larger, and the application scene is more.
3. Compared with the above-mentioned several types of detectors, the utility model is simpler and more convenient to use and can measure in a smaller space.
4. The front bias voltage detector can also be replaced by a photoelectric detector with other wave bands, so that the wave band based on the light to be detected can be modified.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Fig. 2 is a schematic diagram of the present utility model.
Fig. 3 is a schematic diagram of the electronic circuitry of the transimpedance circuit module 3 of fig. 1.
Fig. 4 is a verification circuit of one embodiment of the utility model.
FIG. 5 is a flow chart of the lower computer of the present utility model.
FIG. 6 is a graph of the experimental results of example 2.
In the figure: 1. a laser; 2. a front-end bias detector; 3. a transimpedance circuit module; 4. a lower computer; 5. a multimeter.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, but the present utility model is not limited to these examples.
Example 1
In fig. 1, 2, 3 and 5, the programmable gain type photoelectric detector according to the present utility model is provided with a front bias voltage detector 2 in the light emitting direction of a laser 1, specifically, a semiconductor laser with a visible light band is first placed on an optical platform, so that the output light of the laser 1 is ensured to be normally incident on a light sensing surface of the front bias voltage detector 2, an output end of the front bias voltage detector 2 is electrically connected with an input end of a transimpedance circuit module 3, an output end of the transimpedance circuit module 3 is electrically connected with an input end of a lower computer 4, and the lower computer 4 and an upper computer realize communication through a USB serial port.
After all experiment preparations are completed, the lower computer 4 and the upper computer power supply are turned on, the wavelength of laser is input in the upper computer program, the laser 1 is turned on, and the optical power is adjusted from low to high. The display module of the lower computer 4 displays the corresponding voltage value and gain value, and the lower computer 4 in this embodiment is an MCU, and the model is STM32f103 zet. The corresponding optical power is displayed in the upper computer program.
The transimpedance circuit module 3 is formed by connecting a switch circuit, a negative feedback gain circuit and a transimpedance amplifying circuit.
Specifically, the switch circuit is formed by connecting an analog switch U1 and a connector H1, and the model of the analog switch U1 is ADG1408YRUZ-REEL. The 1 foot, the 2 foot, the 15 foot and the 16 foot of the analog switch U1 are respectively connected with the 1 foot, the 2 foot, the 4 foot and the 3 foot of the connector H1, the 3 foot and the 14 foot of the analog switch U1 are grounded, the 4 foot to 7 foot and the 9 foot to 12 foot are connected with a negative feedback gain circuit, the 8 foot is connected with a transimpedance amplifying circuit and the 13 foot is connected with a power supply. The connector H1 is connected to the front bias detector 2.
The negative feedback gain circuit is formed by connecting resistors R1-R12 and a connector H2, wherein one ends of the resistors R1 and R3 are connected with one end of the resistor R2, the other end of the resistor R3 is connected with the 4 pin of the analog switch U1, the other end of the resistor R1 is connected with one end of the resistor R5, the other end of the resistor R5 is connected with one end of the resistor R4 and one end of the resistor R6, the other end of the resistor R6 is connected with the 5 pin of the analog switch U1 after the resistors R7-R12 are connected in parallel, one end of the resistor R7 is connected with the 2 pin of the connector H2, the other end of the resistor R2 and the other end of the resistor R4 are respectively connected with the 6 pin and the 7 pin of the analog switch U1 and the 12-9 pin, the other end of the resistor R1 and one end of the resistor R5 are connected with the 2 pin of the connector H2, and the 1 pin of the connector H2 is grounded, and the 2 pin is connected with the trans-impedance amplifying circuit. The connector H2 is connected to the output of the front bias detector 2.
The transimpedance amplifier circuit is formed by connecting an integrated circuit U2, a resistor R13, a resistor R14, a capacitor C1, a capacitor C2, a diode ZD1 and a connector H1, wherein the model of the integrated circuit U2 is OPA2380AIDGKR. One end of a 2-pin capacitor C2 of the integrated circuit U2 is grounded through a resistor R13, the 4-pin capacitor C2 is grounded through a resistor R14, the 1-pin capacitor C2 is connected with the negative electrode of a diode ZD1 in parallel, the 8-pin capacitor C1 is connected with the power supply in parallel, the other end of the capacitor C2 is connected with the 8-pin of the analog switch U1, the other end of the capacitor C1 is grounded, the positive electrode of the diode ZD1 is grounded and connected with the 2-pin of a connector H3 in parallel, and the 1-pin of the connector H1 is connected with the 1-pin of the integrated circuit U2. The connector H1 is connected to the I/O port of the lower computer 4.
The using method of the device is as follows:
(1) Placing a system on an optical platform
Placing the laser 1 with adjustable power on an optical platform, connecting a front-end bias voltage detector 2 with the input end of a transimpedance circuit module 3, connecting the output end of the transimpedance circuit module 3 with an A/D acquisition module of a lower computer 4, connecting a control port of the lower computer 4 with the transimpedance circuit module 3, and connecting the lower computer 4 with an upper computer serial port;
(2) Setting an optical path
The output light of the power-adjustable laser 1 is normally incident on the photosensitive surface of the bias voltage detector 2;
(3) Initial measurement
Inputting the wavelength of laser to be detected in the upper computer, transmitting information to the serial port of the lower computer 4 by the serial port of the upper computer, transmitting an initial command to a control pin of the transimpedance circuit module 3 through a program control pin of the MCU after the MCU obtains the wavelength of the laser to be detected, and gating an initial negative feedback gain by the analog switch ADG1408 after the transimpedance circuit module 3 receives the transmitted command;
the power control knob of the laser 1 is adjusted to output different power to be measured.
The laser light spots irradiate on a light sensitive surface of the front bias voltage detector 2, the front bias voltage detector 2 generates corresponding photocurrent, the photocurrent is input to the transimpedance circuit module 3 to generate corresponding voltage, and the A/D acquisition module acquires the output voltage generated by the transimpedance circuit module 3;
(4) MCU automatic adjustment
The voltage signal acquired by the A/D acquisition module is transmitted to the lower computer MCU, the lower computer MCU judges whether the acquired voltage value is saturated or too weak, judges whether the acquired voltage value is within the range of 0.10V-3.30V, if not, the adjustment command is resent to the transimpedance circuit module 3, the analog switch ADG1408 selects the corresponding negative feedback gain, the A/D acquisition module acquires the output voltage of the transimpedance circuit module 3 again, the whole process is continuously circulated, and the aim of automatic adjustment of the whole system is fulfilled;
(5) Data transmission
The lower computer MCU transmits the acquired data and the corresponding gain value to the upper computer serial port through the lower computer serial port, and the optical power is displayed in the upper computer.
The relationship between the transimpedance gain and the output voltage in the step 4 is as follows:
where Vout is the transimpedance Gain, gain is the transimpedance Gain coefficient, P (λ) is the input optical power, and R (λ) is the current responsivity of the bias detector. Further, the effective range of the input optical power P (λ) is: 3 nW-10 mW. The transimpedance Gain coefficients Gain are respectively:
9.84mV/nA,1.02mV/nA,100mV/uA,10mV/uA,5mV/uA
1mV/uA,500mV/mA,100mV/mA。
example 2
In the above embodiment 1, in order to ensure the effective feasibility of the present utility model, the verification circuit as shown in fig. 4 is used for verification, and the Gain coefficients Gain in this embodiment are respectively:
13mV/uA，10mV/uA，5.1mV/uA，2.5V/mA，1V/mA，
820mV/mA，680mV/mA，620mV/mA。
firstly, a semiconductor laser with a visible light wave band is placed on an optical platform, the output light of the laser 4 is ensured to be normally incident on a light sensitive surface of a front bias voltage detector 5, the output end of the front bias voltage detector 5 is connected to the input end of a transimpedance circuit module 3, the output end of the transimpedance circuit module 3 is directly connected to a voltage gear of a universal meter 5, and the control end of the transimpedance circuit module 3 is connected to a lower computer 4. And directly adjusting the laser power to observe the corresponding reading change of the voltmeter.
To verify the benefits of the present utility model, a verification experiment was performed using the apparatus and method of example 2.
The experimental conditions were as follows:
1. experimental conditions
The laser in the experiment adopts a semiconductor laser with the wavelength of 520nm of vincrist industry photoelectric technology limited company, and the lower computer chip is STM32f103 zet. To ensure accuracy of the data, the experiment was performed with the laboratory illumination turned off.
2. Experimental results
The experimental results are shown in FIG. 6.
In FIG. 6 (a), when the laser power was 1.054mW, the photodiode output current was 0.35mA (photodiode responsivity at 520nm wavelength was 0.332 mA/mW). The transimpedance gain factor we choose is 5.1 kmV/mA. Therefore, we need to adjust A0, A1, A2 of the program gain module to 0,1,0. The theoretical output should be 1.785V and the actual measured voltage 1.803V. The error was 0.018V.
Fig. 6 (b), the optical power was adjusted to 10.03mW, and the theoretical photocurrent was calculated to be 3.33mA based on our responsivity. It is necessary to adjust the transimpedance gain to 680mV/mA, so at this time, we need to adjust A0, A1, A2 of the program controlled gain module to 0, 1. The voltage value theoretically generated is 2.264V, the value actually tested is 2.227V, and the error is 0.037V.
In FIG. 6 (c), at maximum gain (13 kmV/mA), the minimum effective optical power value was detected to be 16.68uW. At 16.68uW, the theoretically generated current was 5.53uA, the theoretically output voltage was 71.89mV, the output voltage value i actually measured was 72.8mV, and the error was 0.91mV.
Experimental results further demonstrate the feasibility and effectiveness of using the device and corresponding methods of use.
Claims (9)
1. A program-controlled gain type photoelectric detector is characterized in that: the light emergent direction of the laser (1) is provided with a front-end bias voltage detector (2), the output end of the front-end bias voltage detector (2) is electrically connected with the input end of the transimpedance circuit module (3), the output end of the transimpedance circuit module (3) is electrically connected with the input end of the lower computer (4), and the lower computer (4) and the upper computer are communicated through a USB serial port.
2. The programmable gain photodetector of claim 1, wherein: the transimpedance circuit module (3) is formed by connecting a switch circuit, a negative feedback gain circuit and a transimpedance amplifying circuit.
3. The programmable gain photodetector of claim 2, wherein the switching circuit is: the 1 foot, the 2 foot, the 15 foot and the 16 foot of the analog switch U1 are respectively connected with the 1 foot, the 2 foot, the 4 foot and the 3 foot of the connector H1, the 3 foot and the 14 foot of the analog switch U1 are grounded, the 4-7 foot and the 9-12 foot are connected with a negative feedback gain circuit, the 8 foot is connected with a transimpedance amplifying circuit and the 13 foot is connected with a power supply, and the model of the analog switch U1 is ADG1408YRUZ-REEL.
4. A programmable gain photodetector according to claim 3, wherein said negative feedback gain circuit is: one end of the resistor R1 and one end of the resistor R3 are connected with one end of the resistor R2, the other end of the resistor R3 is connected with the 4 pin of the analog switch U1, the other end of the resistor R1 is connected with one end of the resistor R5, the other end of the resistor R5 is connected with one end of the resistor R4 and one end of the resistor R6, the other end of the resistor R6 is connected with the 5 pin of the analog switch U1 after being connected in parallel, one end of the resistor R7-resistor R12 is connected with the 2 pin of the connector H2, the other end of the resistor R2 and the other end of the resistor R4 are respectively connected with the 6 pin and the 7 pin of the analog switch U1 and the 12-9 pin, the other end of the resistor R1 and one end of the resistor R5 are connected with the 2 pin of the connector H2, and the 1 pin of the connector H2 is grounded, and the 2 pin is connected with the transimpedance amplifying circuit.
5. The programmable gain photodetector of claim 4, wherein the transimpedance amplifier circuit is: one end of a 2-pin capacitor C2 of the integrated circuit U2 is grounded through a resistor R13, the 4-pin capacitor C2 is grounded through a resistor R14, the 1-pin capacitor C2 is connected with the negative electrode of a diode ZD1 in parallel, the 8-pin capacitor C1 is connected with the other end of the power supply in parallel, the other end of the capacitor C2 is connected with the 8-pin of an analog switch U1, the other end of the capacitor C1 is grounded, the positive electrode of the diode ZD1 is grounded and connected with the 2-pin of a connector H3, the 1-pin of the connector H1 is connected with the 1-pin of the integrated circuit U2, and the model of the integrated circuit U2 is OPA2380AIDGKR.
6. The programmable gain photodetector of claim 1, wherein: the relation between the transimpedance gain and the output voltage in the transimpedance circuit module (3) is as follows:
wherein Gain is the transimpedance Gain factor, P (λ) is the input optical power, and R (λ) is the bias detector current responsivity.
7. The programmable gain photodetector of claim 6, wherein: the effective range of the input optical power P (lambda) is as follows: 3 nW-10 mW.
8. The programmable gain photodetector of claim 1, wherein: the acceptable voltage range of the output voltage of the transimpedance circuit module (3) collected by the A/D collection module of the lower computer (4) is 0.10V-3.30V.
9. The programmable gain photodetector of claim 1, wherein: and the transimpedance circuit module (3) is electrically connected with the universal meter (5) for verification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321080919.7U CN220170355U (en) | 2023-05-08 | 2023-05-08 | Program controlled gain type photoelectric detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321080919.7U CN220170355U (en) | 2023-05-08 | 2023-05-08 | Program controlled gain type photoelectric detector |
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| CN220170355U true CN220170355U (en) | 2023-12-12 |
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| CN202321080919.7U Active CN220170355U (en) | 2023-05-08 | 2023-05-08 | Program controlled gain type photoelectric detector |
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