CN221594100U - Photoelectric detection module - Google Patents
Photoelectric detection module Download PDFInfo
- Publication number
- CN221594100U CN221594100U CN202323631932.XU CN202323631932U CN221594100U CN 221594100 U CN221594100 U CN 221594100U CN 202323631932 U CN202323631932 U CN 202323631932U CN 221594100 U CN221594100 U CN 221594100U
- Authority
- CN
- China
- Prior art keywords
- unit
- control circuit
- photoelectric detection
- circuit
- self
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 59
- 238000004891 communication Methods 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims abstract description 10
- 230000003287 optical effect Effects 0.000 claims description 22
- 229910005540 GaP Inorganic materials 0.000 claims description 7
- HZXMRANICFIONG-UHFFFAOYSA-N gallium phosphide Chemical compound [Ga]#P HZXMRANICFIONG-UHFFFAOYSA-N 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 238000010892 electric spark Methods 0.000 abstract description 8
- 230000008859 change Effects 0.000 abstract description 3
- 230000005622 photoelectricity Effects 0.000 abstract description 2
- 230000008054 signal transmission Effects 0.000 abstract 1
- 239000013307 optical fiber Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 6
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000523 sample Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Landscapes
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The utility model relates to the technical field of photoelectric detection, and discloses a photoelectric detection module which comprises three main parts: a photoelectric detection part, a self-detection part and a power supply. The photoelectric detection part consists of a photoelectric detection unit, an amplifying circuit unit, a comparator unit, a monostable trigger unit and a TTL level processing judging unit, and the units are electrically connected to realize signal transmission and processing. The self-checking part is designed to ensure the performance and stability of the photoelectric detection module and comprises a self-checking light source, a control circuit and a pulse driving circuit. The control circuit comprises an automatic power control circuit and an automatic temperature control circuit so as to ensure the working stability of the self-checking light source and ensure that the output power and the wavelength are not changed along with the change of the ambient temperature. The utility model detects the electric spark by photoelectricity and detects the signal, thus realizing the early warning and communication of large industrial equipment.
Description
Technical Field
The utility model relates to the technical field of photoelectric detection, in particular to a photoelectric detection module.
Background
With the increase of the demand for large-scale industrial production and the mass production of large-scale equipment, the demand for high-voltage equipment is increasing, and the high-voltage equipment plays an indispensable role in the large-scale industrial production.
The high-voltage equipment can generate electric sparks on a generation path in the starting process or the working process, the electric sparks have the characteristics of divergence, wide spectrum and the like, the light intensity has uncertainty, the wavelength is 300-500 nm, the high-voltage generation path is a visible light source, the generated signals are pulse or irregular signals in a closed environment in general, the existing detection means are mainly concentrated in electric detection and the like, and the electromagnetic environment is complex in application scene and easy to generate interference.
Disclosure of utility model
The photoelectric detection module provided by the utility model has the advantage of electromagnetic interference resistance, does not introduce electric sparks into the detection unit, has low power consumption and safety, and also has a self-checking function, so that the normal operation of the module is ensured.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a photoelectric detection module comprises a photoelectric detection part, a self-detection part and a power supply; the photoelectric detection part comprises a photoelectric detection unit, an amplifying circuit unit, a comparator unit, a monostable trigger unit and a TTL level processing judging unit;
The photoelectric detection unit, the amplifying circuit unit, the comparator unit, the monostable trigger unit and the TTL level processing judging unit are electrically connected; the self-checking part comprises a self-checking light source, a control circuit and a pulse driving circuit, and the control circuit comprises an automatic power control circuit and an automatic temperature control circuit.
Further, the self-checking light source is a blue laser.
Further, the photodetection section further includes a communication interface for connecting with an external device, the communication interface supporting an RS422 communication protocol.
Further, the photoelectric detection unit adopts a gallium phosphide detector; the gallium phosphide detector is packaged in a TO-16 metal tube shell, an optical window is arranged at the top of the TO-16 metal tube shell, and a guide pin is arranged at the tail of the tube shell.
Further, the amplifying circuit unit employs a transimpedance amplifier to amplify the signal output by the photodetector.
Further, the automatic power control circuit includes an optical power detection circuit; the automatic temperature control circuit comprises a temperature detection circuit; the pulse driving circuit is configured with a logic circuit clock of 25 MHz; the optical power detection circuit and the temperature detection circuit are electrically connected with the logic control circuit.
The principle and beneficial effect of this scheme are: the gallium phosphide detector of the photoelectric detection unit converts the optical signal into an electric signal, and after the electric signal is enhanced by the amplifying circuit unit, the comparator unit compares the electric signal with a set threshold value and judges whether arc light is generated or not. The monostable trigger eliminates interference and prevents false triggering. The TTL level is judged through processing, and the protection optical signal is driven and output.
The blue laser provides a stable light source, and combines an automatic power control circuit and an automatic temperature control circuit to ensure that the power and the wavelength output by the light source are not influenced by the ambient temperature, and meanwhile, a pulse driving circuit is used for converting a stable pulse electric signal into a pulse optical signal.
Drawings
FIG. 1 is a schematic diagram of the electrical principle of a photodetection module according to the present utility model;
FIG. 2 is a schematic diagram of a photo-detection design of a photo-detection module according to the present utility model;
FIG. 3 is a schematic diagram of the output light protection of the photo-detection module according to the present utility model;
FIG. 4 is a schematic diagram of a self-test portion of a photodetection module according to the present utility model;
FIG. 5 is a schematic diagram of optical fiber coupling of a photodetection module according to the present utility model;
Fig. 6 is a timing chart of signal detection and judgment of the photoelectric detection module in the present utility model.
Detailed Description
The embodiment provides a detailed description of a photoelectric detection module, and the photoelectric detection module detects electric sparks through photoelectricity and detects signals so as to realize early warning and communication of large-scale industrial equipment.
The schematic diagram of the principle architecture of the photodetection module shown in fig. 1 includes a photodetection portion, a self-detection portion and a power supply.
The power supply in the present embodiment can provide a low-noise operation power supply for each functional portion and ensure a constant output voltage and current. The input voltage was 220V (allowing for + -15% deviation) for single phase ac and the frequency range was 50Hz (allowing for + -3 Hz deviation). The power supply can adapt to the offset requirement, and ensures stable voltage output under the condition of power supply offset so as to meet the power supply requirement of photoelectric detection. In the embodiment, a linear power supply is used, so that the manufacturing cost is low, high stability can be achieved, the ripple is small, and the interference and noise of the device are small.
As shown in fig. 2, the photodetection section includes a photodetection unit, an amplifying circuit unit, a comparator unit, a monostable flip-flop unit, and a TTL level processing judgment unit; the photoelectric detection unit, the amplifying circuit unit, the comparator unit, the monostable trigger unit and the TTL level processing judging unit are electrically connected; the photoelectric detection part also comprises a communication interface connected with external equipment, the communication interface supports an RS422 communication protocol, and can set related parameters and read the running state of the equipment.
The photoelectric detection function collects and transmits arc light signals through optical fibers, the signals reach the photoelectric module after passing through sensing optical fibers of 10 meters, and the signals are received by a high-sensitivity gallium phosphide detector in the module, and the detector can convert the optical signals into current signals. The spectral response curve of the gallium phosphide detector covers the range of 190nm to 570nm, and the peak wavelength is 440nm, so that the spectral response curve can fully cover the wavelength range of 300nm to 500nm where the electric spark generated by air breakdown discharge is located. The photoelectric detector in the embodiment is packaged in a TO-16 metal tube shell, an optical window is designed at the top of the tube shell, light rays transmitted from the end face of the optical fiber enter the detector, and three guide pins are led out from the tail part and used for transmitting detected electric signals.
Subsequently, the converted current signal is amplified by the front-stage and rear-stage amplifying circuits and converted into a voltage signal. A transimpedance amplifier is employed in this embodiment to amplify the signal output by the photodetector. The transimpedance amplifier adopts the processes of a ceramic substrate, a thick film circuit and the like, so that the transimpedance amplifier has the characteristics of high input impedance, high gain, high bandwidth, low noise and the like, and is packaged in a sealed box body by adopting a micro-assembly process and a detector.
The comparator compares the amplified voltage signal with a set reference voltage to determine whether arc light is generated. Meanwhile, in order to avoid false triggering caused by noise or other interference, the monostable trigger stabilizes the output of the comparator, and the output TTL level signal indicates the existence of arc light.
As shown in fig. 3, the TTL level signal is input to the FPGA, and the laser converts the protection electrical signal into an optical signal with a wavelength of 850nm through timing and logic processing. Under the normal state of the high-voltage source, the red light signal is continuously output to represent no arc light; once an arc is detected, the red light signal will disappear immediately, thus providing a visual indication of the change and achieving effective protection of the high voltage equipment.
Before the photoelectric module works, the power-on self-checking function is provided, and the working state can be reported.
The self-checking part of the photoelectric detection module shown in fig. 4 is composed of a blue laser, a control circuit and a pulse driving circuit. And verifying whether the whole link connection and the photoelectric module work normally or not by carrying out closed loop detection on the whole photoelectric link.
The control circuit comprises an Automatic Power Control (APC) circuit and an Automatic Temperature Control (ATC) circuit, the automatic power control circuit comprises an optical power detection circuit, the automatic temperature control circuit comprises a temperature detection circuit, and the optical power detection circuit and the temperature detection circuit are electrically connected with the logic control circuit.
The blue laser, as a light emitting device, has a typical output light wavelength of 411nm and is responsible for electro-optic conversion. The control circuit is used for keeping the working stability of the self-checking light source and ensuring that the output power and the wavelength of the laser are not changed due to the change of the ambient temperature.
The specific implementation mode is that the automatic power control senses the output optical power of the laser through the optical power detection circuit and compares the output optical power with the set reference optical power. According to the comparison result, the logic control chip adjusts the bias current of the laser LD to maintain the constant optical power so as to achieve the purpose of automatic power control. In addition, the automatic temperature control senses the working temperature inside the laser through the temperature detection circuit, the current of the refrigerator is regulated according to the set reference temperature difference value, and the logic control chip enables the working temperature inside the laser to be constant through detecting the temperature and controlling the current of the refrigerator, so that the purpose of automatic temperature control is achieved.
The pulse driving circuit is provided with a logic circuit clock of 25MHz, and generates a pulse electric signal of 10+ -1 kHz and 5% duty cycle in a frequency division manner. The pulse electric signal is directly modulated on the bias current and transmitted to the transmitting end of the laser, and the conversion from the pulse electric signal to the pulse optical signal can be completed.
In this embodiment, an optical fiber probe is made of an optical fiber having a diameter of 1mm to improve lighting efficiency. As shown in fig. 5, the fiber core is an effective part for coupling optical radiation, and the larger the core area, the higher the coupling efficiency, so that an optical fiber with a fiber core diameter of 1mm is selected to manufacture the optical fiber probe. Meanwhile, in order to further improve the coupling efficiency, grinding, polishing and coating treatment are required to be carried out on the end face of the optical fiber. In addition, the optical fiber is fragile and has no rigidity, and the optical fiber probe is partially arranged in the stainless steel sleeve, so that the reliability of the optical fiber is enhanced, and the optical fiber probe has high temperature resistance (150 ℃).
In addition, in this embodiment, when the detected signal pulse width is greater than 100ns, it is determined that an effective electric spark generates a signal, and a high level is output at the same time, so as to generate a spark protection, and the original optical path is cut off to be no light output until the system is reset. The signal detection judgment timing is shown in fig. 6.
The photoelectric detection module in the embodiment has high sensitivity of-40 dBm, can convert an analog electric spark signal into a quantifiable digital signal, and has good electromagnetic interference resistance and low power consumption.
The foregoing is merely exemplary of the present utility model, and specific technical solutions and/or features that are well known in the art have not been described in detail herein. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the technical solution of the present utility model, and these should also be regarded as the protection scope of the present utility model, which does not affect the effect of the implementation of the present utility model and the practical applicability of the patent. The protection scope of the present utility model is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (6)
1. The photoelectric detection module is characterized by comprising a photoelectric detection part, a self-detection part and a power supply; the photoelectric detection part comprises a photoelectric detection unit, an amplifying circuit unit, a comparator unit, a monostable trigger unit and a TTL level processing judging unit;
The photoelectric detection unit, the amplifying circuit unit, the comparator unit, the monostable trigger unit and the TTL level processing judging unit are electrically connected; the self-checking part comprises a self-checking light source, a control circuit and a pulse driving circuit, and the control circuit comprises an automatic power control circuit and an automatic temperature control circuit.
2. The photodetection module according to claim 1, wherein the self-checking light source is a blue laser.
3. The photodetection module according to claim 1, wherein the photodetection portion further comprises a communication interface connected to an external device, the communication interface supporting an RS422 communication protocol.
4. The photodetection module according to claim 1, wherein the photodetection unit employs a gallium phosphide detector; the gallium phosphide detector is packaged in a TO-16 metal tube shell, an optical window is arranged at the top of the TO-16 metal tube shell, and a guide pin is arranged at the tail of the tube shell.
5. The photodetection module according to claim 1, wherein the amplifying circuit unit employs a transimpedance amplifier to amplify the signal output by the photodetector.
6. The photodetection module according to claim 1, wherein the automatic power control circuit comprises an optical power detection circuit; the automatic temperature control circuit comprises a temperature detection circuit; the optical power detection circuit and the temperature detection circuit are electrically connected with the logic control circuit; the pulse drive circuit is configured with a 25MHz logic circuit clock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323631932.XU CN221594100U (en) | 2023-12-29 | 2023-12-29 | Photoelectric detection module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323631932.XU CN221594100U (en) | 2023-12-29 | 2023-12-29 | Photoelectric detection module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221594100U true CN221594100U (en) | 2024-08-23 |
Family
ID=92418057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323631932.XU Active CN221594100U (en) | 2023-12-29 | 2023-12-29 | Photoelectric detection module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221594100U (en) |
-
2023
- 2023-12-29 CN CN202323631932.XU patent/CN221594100U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202735549U (en) | Integral receiving and transmitting device | |
| CN106059554A (en) | Diffuse reflection photoelectric switch | |
| US10069574B2 (en) | Optocoupler with indication of light source power supply failure | |
| CN112414583A (en) | Optical fiber temperature measurement method and device integrating arc light detection | |
| CN104792409A (en) | High-power microwave ignition detecting system and high-power microwave ignition detecting method | |
| CN221594100U (en) | Photoelectric detection module | |
| CN102244511A (en) | Application-specific integrated circuit for remote infrared photoelectric switch and remote infrared photoelectric switch using same | |
| CN205280837U (en) | Arc light detection sensor | |
| CN117991395A (en) | Photoelectric sensor detection circuit and detection equipment | |
| CN206330869U (en) | A kind of circuit for flue dust on-line computing model | |
| CN216670775U (en) | Device based on reflective photosensitive automatic identification filter | |
| CN105897237B (en) | A kind of retroreflecting optoelectronic switch | |
| CN204719274U (en) | A kind of optical fiber transceiver module | |
| CN115426049A (en) | Low-power consumption optical module | |
| CN209134380U (en) | A kind of Photoelectric infrared switch being convenient for installation | |
| CN201765337U (en) | Laser cold and hot metal detector | |
| CN205647484U (en) | Diffuse reflection photoelectric switch | |
| CN218958258U (en) | Laser control device | |
| CN110118598B (en) | Delay circuit for avalanche photodiode and integrated single photon detection circuit | |
| CN215910651U (en) | Miniature intelligent PIN diode bundle loss detector | |
| CN1987519A (en) | Infrared cold/hot metal detector | |
| CN116660604B (en) | Quantum transformer based on optical energy supply and communication technology and current detection method | |
| CN205545280U (en) | Two SFP optical modules of receiving of 32Kbps~80Mbps low rate | |
| CN208522759U (en) | A kind of novel optical module | |
| CN216774749U (en) | Anti-interference photosensitive tube and photosensitive system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |