Photoelectric detection system
The parallel acquisition and processing technology of the photoelectric detection system solves the problem that the microprocessor cannot simultaneously acquire multiple photoelectric signals, and realizes efficient and accurate real-time acquisition of photoelectric signals, which is suitable for medical instruments such as CT equipment.
Patent Information
- Application Number
- CN202410331285.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-18
- Publication Date
- 2025-09-19
AI Technical Summary
When existing photoelectric detection devices need to quickly collect a large number of light signals, the microprocessor is unable to simultaneously collect the photoelectric converters of multiple different channels, resulting in shortened collection time, signal distortion, and affected collection effects.
A photoelectric detection system is used to connect the signal processing module and the main control module through the serial peripheral interface protocol. A data processing circuit is set to parallelly collect and store the digital voltage signals converted by multiple analog-to-digital conversion circuits, thereby realizing the parallel collection of multiple photoelectric signals and reducing crosstalk and data processing pressure.
While ensuring acquisition accuracy, it improves the real-time acquisition efficiency and precision of photoelectric signals, reduces crosstalk between components, and adapts to the needs of quickly acquiring a large number of optical signals.
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Figure CN120668255A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to a photoelectric detection system. Background Art
[0002] A common photoelectric detection device includes a microprocessor and several photoelectric converters connected to the microprocessor. When a large amount of data needs to be collected, the microprocessor typically switches between photoelectric converters of different channels in sequence through analog switches within a single frame, multiplexing the channels and collecting a large number of signals. However, because the microprocessor cannot simultaneously collect photoelectric converters from multiple channels, as the number of photoelectric signals collected increases and the timing requirements become more stringent, the need to collect a large number of optical signals in real time at a faster speed compresses the frame time. This shortens the acquisition time allocated by the microprocessor to each photoelectric converter, resulting in distortion of the collected signals and, in turn, affecting the acquisition quality. Summary of the Invention
[0003] On one hand, the present application provides a photoelectric detection system, comprising:
[0004] At least one photoelectric detection module, the photoelectric detection module comprising:
[0005] A signal acquisition module, comprising a plurality of acquisition circuits, each of which is used to acquire a beam of light signal and output a channel of the analog voltage signal;
[0006] a signal processing module, comprising a plurality of analog-to-digital conversion circuits, each of the analog-to-digital conversion circuits being electrically connected to one of the acquisition circuits, and configured to receive the analog voltage signal and convert the analog voltage signal into a digital voltage signal; and
[0007] The main control module, the signal processing module is connected to the main control module via a serial peripheral interface protocol, and the main control module includes a data processing circuit for parallel acquisition and storage of the digital voltage signals converted by multiple analog-to-digital conversion circuits.
[0008] The photoelectric detection system provided in the embodiment of the present application, by setting a signal processing module in the photoelectric detection module to be connected to the main control module through a serial peripheral interface protocol, and setting the main control module to include a data processing circuit, can enable the main control module to collect and store the digital voltage signals converted by multiple analog-to-digital conversion circuits in parallel, thereby realizing parallel collection of multiple photoelectric signals, which is beneficial to reducing crosstalk between different components and data processing pressure while ensuring collection accuracy, thereby facilitating real-time collection of a large number of photoelectric signals.
[0009] In one embodiment, the acquisition circuit includes a photoelectric conversion circuit and a transimpedance conversion circuit, wherein the photoelectric conversion circuit is used to convert the optical signal into an analog current signal; the transimpedance conversion circuit is electrically connected to the photoelectric conversion circuit and is used to convert the analog current signal into the analog voltage signal.
[0010] In one embodiment, the photoelectric detection module also includes a driving module, which is electrically connected to the main control module. The driving module includes multiple diode driving circuits, each of which is electrically connected to a laser diode and is used to drive the laser diode to emit a beam of the light signal. The light signal emitted by each laser diode is collected by a corresponding collection circuit.
[0011] In one embodiment, the driving module is connected to the main control module via a serial peripheral interface protocol.
[0012] In one embodiment, the main control module is embedded in a field programmable gate array chip or a complex programmable logic device chip.
[0013] In one embodiment, the main control module further includes a clock control circuit, and the clock control circuit is used to generate a clock signal.
[0014] In one embodiment, the photoelectric detection module further includes a communication module, which is electrically connected to the main control module and is used to send instructions to the main control module and to transmit the multiple digital voltage signals stored in the main control module.
[0015] In one embodiment, the multiple communication modules of the multiple photoelectric detection modules are connected in parallel, and the main control module of one of the photoelectric detection modules is used to send instructions to the other photoelectric detection modules, and to receive and store the multiple digital voltage signals transmitted by the other photoelectric detection modules.
[0016] In one embodiment, the main control module further includes a power supply support circuit, and the power supply support circuit is configured to be electrically connected to an external power supply to supply power to the photoelectric detection module.
[0017] In one embodiment, the data processing circuit includes a parallel acquisition circuit and a storage circuit. The parallel acquisition circuit is used to simultaneously acquire multiple channels of digital voltage signals converted by the analog-to-digital conversion circuit and to store the multiple channels of digital voltage signals in the storage circuit. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a module diagram of a single photoelectric detection module in the photoelectric detection system in an embodiment of the present application.
[0019] Figure 2 This is a module diagram of the acquisition circuit in an embodiment of the present application.
[0020] Figure 3 This is a module diagram of the main control module in an embodiment of the present application.
[0021] Figure 4 This is a module diagram of the photoelectric detection system in an embodiment of the present application.
[0022] Description of main component symbols
[0023] Photoelectric detection system 1
[0024] Photoelectric detection module 100
[0025] Signal acquisition module 10
[0026] Acquisition circuit 11
[0027] Photoelectric conversion circuit 111
[0028] Transimpedance conversion circuit 113
[0029] Signal processing module 30
[0030] Analog-to-digital conversion circuit 31
[0031] Main control module 50
[0032] Data processing circuit 51
[0033] Parallel acquisition circuit 511
[0034] Storage circuit 513
[0035] Conversion control circuit 515
[0036] Drive control circuit 517
[0037] Clock control circuit 53
[0038] Communication connection circuit 55
[0039] Power supply support circuit 57
[0040] Crystal oscillator 60
[0041] Driver module 70
[0042] Diode drive circuit 71
[0043] Power Supply 80
[0044] Communication module 90
[0045] Interface SPI1, SPI2
[0046] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION
[0047] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.
[0048] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.
[0049] In order to further illustrate the technical means and effects adopted by this application to achieve the intended purpose, the following detailed description of this application is made in conjunction with the accompanying drawings and preferred implementation methods.
[0050] See also Figure 1 The photoelectric detection system 1 provided in an embodiment of the present application includes at least one photoelectric detection module 100, and each photoelectric detection module 100 includes a signal acquisition module 10, a signal processing module 30, a main control module 50 and a driving module 70. Among them, the signal acquisition module 10 is connected to the signal processing module 30, and is used to collect multiple light signals, and convert the multiple light signals into multiple analog voltage signals and transmit them to the signal processing module 30. The signal processing module 30 is used to convert the multiple analog voltage signals into multiple digital voltage signals. The signal processing module 30 is connected to the main control module 50 via a serial peripheral interface (SPI) protocol. The main control module 50 includes a data processing circuit 51 for parallel acquisition and storage of the multiple digital voltage signals. The driving module 70 is electrically connected to the main control module 50, and is used to connect multiple laser diodes (not shown) and to drive the multiple laser light emitting diodes to emit light signals. The light signals emitted by the multiple laser light emitting diodes are received by the signal acquisition module 10 after being reflected by the object to be measured.
[0051] Specifically, the signal acquisition module 10 includes a plurality of acquisition circuits 11, each of which is used to acquire a beam of light signal and convert it into an analog voltage signal. Figure 2 Each acquisition circuit 11 includes a photoelectric conversion circuit 111 and a transimpedance conversion circuit 113, wherein the photoelectric conversion circuit 111 is used to convert a beam of light signal into an analog current signal, and the transimpedance conversion circuit 113 is used to convert the analog current signal into an analog voltage signal.
[0052] The photoelectric conversion circuit 111 may include a photodiode and a signal bias access circuit, wherein the photodiode is used to receive an optical signal and generate a photoelectric conversion under the influence of the optical signal. The signal bias access circuit is electrically connected to the photodiode and is used to record the electrical signal converted by the photodiode, thereby converting the waveform of light in the optical signal into an analog current signal of a corresponding waveform.
[0053] The transimpedance conversion circuit 113 is specifically a current-voltage transimpedance conversion circuit, which is used to convert the analog current signal into an analog voltage signal that can be recognized by the signal processing module 30, thereby facilitating the processing and recording of the optical signal.
[0054] Please refer to Figure 1 The signal processing module 30 includes multiple analog-to-digital conversion circuits 31. Each analog-to-digital conversion circuit 31 is electrically connected to a data acquisition circuit 11 and is configured to receive an analog voltage signal and convert the analog voltage signal into a digital voltage signal. Specifically, the analog-to-digital conversion circuit 31 includes an analog-to-digital converter (ADC), which can convert analog electrical signals into digital electrical signals, thereby facilitating the processing and recording of the electrical signals.
[0055] In this embodiment, the multiple analog-to-digital conversion circuits 31 in the signal processing module 30 are synchronous ADCs. That is, the ADCs in the multiple analog-to-digital conversion circuits 31 are of the same model and are connected in parallel to the data processing circuit 51. The multiple optical signals collected by the signal acquisition module 10 can be synchronously collected and processed by the signal processing module 30, thereby improving acquisition efficiency. In other embodiments, the multiple analog-to-digital conversion circuits 31 in the signal processing module 30 can also be asynchronous ADCs. Asynchronous ADCs can also achieve synchronous acquisition, but require time-sequential processing of the optical signals.
[0056] Please also refer to Figure 1 and Figure 3 The data processing circuit 51 includes a parallel acquisition circuit 511, a storage circuit 513, a conversion control circuit 515, and a drive control circuit 517. The parallel acquisition circuit 511 is used to simultaneously acquire digital voltage signals converted by multiple analog-to-digital conversion circuits 31 and to store the multiple digital voltage signals in the storage circuit 513. The conversion control circuit 515 is electrically connected to each analog-to-digital conversion circuit 31 in the signal processing module 30 and is used to set the parameters of the analog-to-digital conversion circuit 31 to obtain a digital voltage signal that meets the requirements. The conversion control circuit 515 is also connected to the storage circuit 513 to read the digital voltage signal stored in the storage circuit 513, thereby facilitating the adjustment of the parameters of the analog-to-digital conversion circuit 31 according to the data stored in the storage circuit 513. The drive control circuit 517 is used to connect to the drive module 70 to set the parameters of the drive module 70.
[0057] The main control module 50 also includes interfaces SPI1 and SPI2, both of which support the SPI protocol. Interface SPI1 is connected to the signal processing module 30 and to the parallel acquisition circuit 511 in the data processing circuit 51, enabling the parallel acquisition circuit 511 to perform parallel acquisition of the multiple analog-to-digital conversion circuits 31 in the signal processing module 30. Interface SPI2 is connected to the driver module 70 and to the drive control circuit 517 in the data processing circuit 51, enabling the drive control circuit 517 to control the emission parameters of the multiple laser diodes connected to the driver module 70 in parallel.
[0058] The photoelectric detection system 1 provided in an embodiment of the present application, by providing a signal processing module 30 in a photoelectric detection module 100 connected to a main control module 50 via an SPI protocol, can enable the main control module 50 to simultaneously read multiple digital voltage signals and synchronously process the multiple digital voltage signals. Since the main control module 50 can simultaneously process digital voltage signals transmitted by multiple data processing circuits 51, the number of data processing circuits 51 connected to the main control module 50 can be set according to actual needs without affecting the efficiency of optical signal acquisition. For example, the number of data processing circuits 51 simultaneously connected to the main control module 50 can be eight, sixteen, or thirty-two, and this application does not impose any restrictions on this.
[0059] The photodetection module 100 further includes a crystal oscillator 60 and a power supply 80, which are electrically connected to the main control module 50. The crystal oscillator 60 is used to work with the main control module 50 to generate a clock signal, and the power supply 80 is used to power the main control module 50 and the signal acquisition module 10, the signal processing module 30, and the drive module 70 electrically connected to the main control module 50.
[0060] The main control module 50 also includes a clock control circuit 53, a communication connection circuit 55, and a power supply support circuit 57. The clock control circuit 53 is connected to a crystal oscillator 60 to generate a clock signal. The clock control circuit 53 is also electrically connected to the data processing circuit 51, thereby facilitating the data processing circuit 51 to unify the timing of multiple analog-to-digital conversion circuits 31. Specifically, the clock control circuit 53 is connected to a parallel acquisition circuit 511, thereby outputting the clock signal to the signal processing module 30 through the parallel acquisition circuit 511. This allows each analog-to-digital conversion circuit 31 to simultaneously read the clock signal via the SPI protocol, thereby achieving timing unification of multiple digital voltage signals.
[0061] The clock control circuit 53 is also connected to the drive control circuit 517, thereby providing a clock signal to the drive module 70 so that the drive module 70 can modulate the frequency of the laser diode's light emission according to the clock signal. Specifically, the drive module 70 includes multiple diode drive circuits 71, each of which is electrically connected to a laser diode. Each diode drive circuit 71 is used to drive the corresponding laser diode to emit a light signal. The light signal emitted by each laser diode is reflected by the object to be detected and then collected by a corresponding acquisition circuit 11. The drive control circuit 517 can simultaneously transmit multiple clock signals to each diode drive circuit 71 via the SPI protocol, and the diode drive circuit 71 can modulate the frequency of the laser diode's light emission according to the clock signal. The drive control circuit 517 can also simultaneously transmit multiple control signals to each diode drive circuit 71 via the SPI protocol. The control signals are used to adjust the duty cycle of the laser diode's light emission, that is, the ratio of the time the laser diode emits light to the time it does not emit light within a cycle. The driving control circuit 517 can modulate the duty cycle and frequency of each laser diode's light emission by transmitting clock signals and control signals to each diode driving circuit 71, thereby modulating the waveform of the laser emitted by the laser diode and generating an optical signal to facilitate the main control module 50 to identify the optical signal.
[0062] The communication connection circuit 55 is connected to the clock control circuit 53 for outputting the clock signal from the main control module 50. The communication connection circuit 55 is also connected to the storage circuit 513 for transmitting external input data to the storage circuit 513 or transmitting data stored in the storage circuit 513 to the outside.
[0063] The photoelectric detection module 100 also includes a communication module 90, which is electrically connected to the main control module 50 and is used to send instructions to the main control module 50 and to transmit multiple digital voltage signals stored in the main control module 50. Specifically, the communication module 90 is connected to the communication connection circuit 55, and can call out the multiple digital voltage signals stored in the storage circuit 513 through the communication connection circuit 55, or transmit external digital voltage signals to the storage circuit 513.
[0064] In this embodiment, the communication module 90 can also transmit an external clock signal, thereby transmitting the clock signal to the clock control circuit 53 through the communication connection circuit 55, so that the clock signal generated by the clock control circuit 53 is consistent with the external clock signal, and thus the clock signal received by the parallel acquisition circuit 511 and the drive control circuit 517 connected to the clock control circuit 53 is consistent with the external clock signal. In other embodiments, the communication connection circuit 55 can also be directly connected to the parallel acquisition circuit 511, the conversion control circuit 515, and the drive control circuit 517. The communication module 90 can also be used to receive external control signals and transmit the control signals to the parallel acquisition circuit 511, the conversion control circuit 515, and the drive control circuit 517, thereby setting the parameters of the signal processing module 30 and the drive module 70.
[0065] See also Figure 4 The multiple communication modules 90 of the multiple photodetection modules 100 are connected in parallel, thereby connecting the multiple photodetection modules 100 in parallel. One of the photodetection modules 100 can be set as a master device, and the other photodetection modules 100 can be set as slave devices. The master control module 50 of the master device is used to send instructions to the other photodetection modules 100 via the communication module 90, thereby controlling the multiple photodetection modules 100 to simultaneously send and collect light signals. The master control module 50 of the master device is also used to receive and store multiple digital voltage signals transmitted by the other photodetection modules 100 via the communication module 90.
[0066] Specifically, the master control module 50 of the master device can send a clock signal to the other photodetection modules 100, thereby unifying the timing of the optical signals collected by the multiple photodetection modules 100. That is, the master control module 50 of the master device can control the master control module 50 of the slave device to drive the corresponding signal processing module 30 and driver module 70, thereby controlling the multiple laser diodes of each photodetection module 100 to emit light and converting the optical signals collected by each signal acquisition module 10 to ultimately obtain multiple digital voltage signals. The multiple digital voltage signals stored in the storage circuit 513 of the slave device can be transmitted to the storage circuit 513 of the master device via the corresponding communication module 90, thereby completing the integration of the optical signals collected by the multiple photodetection modules 100.
[0067] The photoelectric detection system 1 provided in the embodiment of the present application can expand the number of channels of optical signals collected simultaneously by setting up multiple photoelectric detection modules 100 connected in parallel through multiple communication modules 90, thereby improving the efficiency of collection. By setting one of the photoelectric detection modules 100 as a master device and the other photoelectric detection modules 100 as slave devices, the timing of the multiple photoelectric detection modules 100 can be unified, thereby improving the accuracy of collection. In other embodiments, multiple photoelectric detection modules 100 connected in parallel can also be set as multiple master devices, and this application does not limit this.
[0068] The power supply support circuit 57 is connected to the power supply 80 to provide power to the photodetection module 100. Specifically, the power supply support circuit 57 can include multiple voltage supports for adapting to different voltages of the power supply 80 and converting the voltage input by the power supply 80 into a voltage that is suitable for the photodetection module 100, thereby providing power to the photodetection module 100.
[0069] In this embodiment, the main control module 50 is embedded in a Field Programmable Gate Array (FPGA) chip. Specifically, an FPGA chip is a semi-custom circuit that includes a download interface circuit. The internal circuit connections can be adjusted through programming, thereby customizing the corresponding logic circuit according to the user's needs. The data processing circuit 51, clock control circuit 53, communication connection circuit 55, and power supply support circuit 57 within the main control module 50 can be programmed into the FPGA chip through the download interface circuit, allowing the FPGA chip to implement the functions of the main control module 50. In other embodiments, the main control module 50 can also be embedded in a Complex Programmable Logic Device (CPLD) chip.
[0070] The photoelectric detection system 1 provided in the embodiments of the present application can be used in fields such as medical instruments to obtain multiple physiological indicators of the human body. For example, the signals collected by X-ray computed tomography (CT) are generally at medium and low frequencies and have the characteristics of large quantity, variety, and strong parallelism. Therefore, the photoelectric detection system 1 of the embodiments of the present application can quickly acquire CT images of patients.
[0071] The photoelectric detection system 1 provided in the embodiments of the present application can further expand the number of optical signals collected by the photoelectric detection system 1 by connecting multiple photoelectric detection modules 100 in parallel, thereby significantly increasing the signal acquisition rate. By providing multiple photoelectric detection modules 100, including master and slave devices, the synchronization of signals collected by each channel can be ensured, crosstalk between components can be reduced, and the speed of data processing can be improved.
[0072] Those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present application and are not intended to limit the present application. As long as they are within the spirit of the present application, appropriate changes and modifications to the above embodiments are within the scope of protection claimed in the present application.
Claims
1. A photoelectric detection system, characterized in that: include: At least one photoelectric detection module, the photoelectric detection module comprising: The signal acquisition module includes a plurality of acquisition circuits, each of which is used to acquire a beam of light signal and output an analog voltage signal; a signal processing module, comprising a plurality of analog-to-digital conversion circuits, each of the analog-to-digital conversion circuits being electrically connected to one of the acquisition circuits, and configured to receive the analog voltage signal and convert the analog voltage signal into a digital voltage signal; and The main control module, the signal processing module is connected to the main control module via a serial peripheral interface protocol, and the main control module includes a data processing circuit for parallel acquisition and storage of the digital voltage signals converted by multiple analog-to-digital conversion circuits.
2. The photoelectric detection system according to claim 1, wherein: The acquisition circuit includes a photoelectric conversion circuit and a transimpedance conversion circuit. The photoelectric conversion circuit is used to convert the optical signal into an analog current signal. The transimpedance conversion circuit is electrically connected to the photoelectric conversion circuit and is used to convert the analog current signal into the analog voltage signal.
3. The photoelectric detection system according to claim 1, wherein: The photoelectric detection module also includes a driving module, which is electrically connected to the main control module. The driving module includes multiple diode driving circuits, each of which is electrically connected to a laser diode and is used to drive the laser diode to emit a beam of the light signal. The light signal emitted by each laser diode is collected by a corresponding collection circuit.
4. The photoelectric detection system according to claim 3, wherein: The driving module is connected to the main control module via a serial peripheral interface protocol.
5. The photoelectric detection system according to claim 1, wherein: The main control module is embedded in a field programmable logic gate array chip or a complex programmable logic device chip.
6. The photoelectric detection system according to claim 1, wherein: The main control module further includes a clock control circuit, and the clock control circuit is used to generate a clock signal.
7. The photoelectric detection system according to claim 1, wherein: The photoelectric detection module further includes a communication module, which is electrically connected to the main control module and is used to send instructions to the main control module and to transmit the multiple digital voltage signals stored in the main control module.
8. The photoelectric detection system according to claim 7, wherein: The multiple communication modules of the multiple photoelectric detection modules are connected in parallel, wherein the main control module of one of the photoelectric detection modules is used to send instructions to the other photoelectric detection modules, and to receive and store the multiple digital voltage signals transmitted by the other photoelectric detection modules.
9. The photoelectric detection system according to claim 1, wherein: The main control module further includes a power supply support circuit, which is used to be electrically connected to an external power supply to supply power to the photoelectric detection module.
10. The photoelectric detection system according to claim 1, wherein: The data processing circuit includes a parallel acquisition circuit and a storage circuit. The parallel acquisition circuit is used to simultaneously acquire the digital voltage signals converted by the multiple analog-to-digital conversion circuits and to store the multiple digital voltage signals in the storage circuit.