Terahertz detector NETD intelligent detection system

Abstract

The invention discloses a terahertz detector NETD intelligent detection system in the technical field of terahertz detector performance detection, and the system comprises a controller, and a detector body and an upper computer which are connected with the controller, the intelligent detection system also comprises a black body module, a black body cavity is formed in the black body module, and the black body cavity is connected with the controller. The detector body is embedded in the black body cavity, the black body module comprises a second shell and an electric heating plate arranged on one side of the second shell, and the electric heating plate is provided with a wave absorbing material and a temperature probe. A controller adjusts an electric heating plate according to temperature data measured by a temperature probe and receives voltage data fed back by a detector body, after the controller sends the voltage data and the temperature data to an upper computer, the upper computer calculates NETD parameters of the detector body based on the voltage data and the temperature data, and the NETD parameters of the detector body are calculated according to the NETD parameters. And the shell, the electric heating plate and the wave absorbing material form a black body cavity, so that the cost is saved on the premise of ensuring the NETD measurement precision.

Description

Technical Field

[0001] The present invention relates to the field of terahertz detector performance detection, and in particular to a terahertz detector NETD intelligent detection system. Background Art

[0002] The noise equivalent temperature difference (NETD) of a terahertz detector is a key parameter for measuring its thermal sensitivity. Currently, traditional NETD detection systems rely on professional-grade terahertz blackbody cavities, which utilize a gold-plated oxygen-free copper sealing structure and a liquid-cooled temperature control system. Each system costs hundreds of thousands of yuan and is difficult to automate. During the detection process, the blackbody temperature must be manually adjusted, the detector output voltage must be recorded sequentially, and the NETD value must be calculated offline, resulting in low detection efficiency and poorly consistent results. Existing solutions, particularly for scenarios where batch testing is required on enterprise production lines, suffer from three major drawbacks: excessive cost, low automation, and poor repeatability. Therefore, there is an urgent need for a low-cost, fully automated detection system to perform quality testing on the performance of terahertz detectors. Summary of the Invention

[0003] The object of the present invention is to provide a terahertz detector NETD intelligent detection system, which solves the problem that the existing terahertz detector detection system is difficult to automatically detect the NETD performance parameters of the terahertz detector at low cost.

[0004] The present invention achieves the above-mentioned purpose through the following technical solutions: A terahertz detector (NETD) intelligent detection system includes a controller, a detector body connected to the controller, and a host computer. The intelligent detection system also includes a blackbody module separated from the controller. A temperature-adjustable blackbody cavity is formed inside the blackbody module. A terahertz wave receiving end of the detector body is embedded in the blackbody cavity.

[0005] The blackbody module includes a second shell and a heating plate arranged on one side of the second shell. The heating plate is provided with an absorbing material and a temperature probe. The second shell, the heating plate and the absorbing material form the blackbody cavity.

[0006] The controller adjusts the electric heating plate according to the temperature data measured by the temperature probe and receives the voltage data fed back by the detector body. After the controller sends the voltage data and temperature data to the host computer, the host computer calculates the NETD parameters of the detector body based on the voltage data and temperature data.

[0007] As a further optimization scheme of the present invention, the controller includes a shell one, and a control board arranged inside the shell one, the two ends of the shell one are respectively provided with an air inlet and an air outlet, and the air outlet of the shell one is provided with a device cooling fan, and the device cooling fan is used to provide a constant temperature environment for the control board so that the control board can provide low-noise power supply to the detector body.

[0008] As a further optimization solution of the present invention, an air inlet and an air outlet are respectively provided at both ends of the second shell, and a blackbody cooling fan is provided on the air outlet of the second shell.

[0009] As a further optimization solution of the present invention, protective nets are provided on the air inlets of the housing 1 and the housing 2, as well as the equipment cooling fan and the blackbody cooling fan.

[0010] As a further optimization scheme of the present invention, the control board includes a PCB board and a lower computer and a device thermometer and hygrometer arranged on the PCB board. An environmental thermometer and hygrometer is provided on the outer side of the shell. The lower computer performs PWM control on the device cooling fan according to the temperature data measured by the device thermometer and hygrometer and the environmental thermometer and hygrometer.

[0011] As a further optimization solution of the present invention, the control board also includes an AC power regulation module and a relay module arranged on the PCB board; the control board regulates the electric heating plate through the AC power regulation module, and regulates the detector body and the blackbody cooling fan through the relay module.

[0012] As a further optimization solution of the present invention, a plurality of detector bodies are provided, the terahertz wave receiving end of each detector body is embedded in the blackbody cavity, and the electric heating plate is arranged opposite to the detector body.

[0013] As a further optimization solution of the present invention, the system also includes a base plate and a mounting plate fixed on the base plate. The controller and blackbody module are respectively fixed on both sides of the base plate. The mounting plate is provided with limit grooves corresponding to the detector body.

[0014] A terahertz detector NETD intelligent detection method, based on the above system, comprises the following steps: S1. Separate the controller from the blackbody module and connect the controller to the detector body and the host computer so that the terahertz wave receiving end of the detector body is embedded in the blackbody cavity of the blackbody module.

[0015] S2. The controller adjusts the electric heating plate in combination with the temperature data measured by the temperature probe to heat the blackbody cavity and receives the voltage data fed back by the detector body.

[0016] S3. The controller sends the voltage data and temperature data to a host computer, and the host computer calculates the NETD parameter of the detector body based on the voltage data and temperature data.

[0017] A storage medium stores computer program instructions, which, when executed by a processor, implement the above-mentioned terahertz detector NETD intelligent detection method.

[0018] The beneficial effects of the present invention are: The present invention uses a housing, a heating plate, and an absorbing material to form a blackbody cavity, which can replace expensive professional blackbodies. The temperature of the heating plate is controlled in a closed loop by a PID algorithm. While ensuring the NETD measurement accuracy, the cost is reduced, solving the problem of existing systems that cannot balance accuracy and cost. The present invention adopts a multi-detector parallel measurement architecture to support simultaneous data acquisition by multiple detectors. A single heating process completes all detections of each detector, greatly improving efficiency and meeting the high-throughput requirements of enterprise production lines. The present invention realizes detector power supply noise suppression and temperature adaptive adjustment through the design of a separate controller and a blackbody module, combined with real-time monitoring of ambient temperature and humidity, ensuring the stability of voltage data acquisition. The host computer can automatically calculate the NETD parameter and reduce the repeatability error of the NETD parameter measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a system block diagram of the present invention; Figure 2 Schematic diagram of the overall structure of the intelligent monitoring system of the present invention; Figure 3 Schematic diagram of the internal structure of the intelligent monitoring system of the present invention; Figure 4 Schematic diagram of the top view of the intelligent monitoring system of the present invention; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the control panel structure of the present invention; In the figure: 1. Controller; 2. Detector body; 3. Blackbody module; 4. Protective net; 5. Bottom plate; 6. Mounting plate; 11. Housing 1; 12. Control board; 13. Equipment cooling fan; 14. DC power supply; 31. Housing 2; 32. Heating plate; 33. Absorbing material; 34. Temperature probe; 35. Blackbody cooling fan; 36. Assembly board; 37. Partition; 121. Lower computer; 122. Equipment temperature and humidity meter; 123. AC power regulation module; 124. Relay 1; 125. Relay 2; 126. Serial communication module. DETAILED DESCRIPTION

[0020] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0021] First embodiment like Figure 1-3As shown, this embodiment relates to a terahertz detector NETD intelligent detection system, which includes a controller 1, a detector body 2 connected to the controller 1, and a host computer. The detector body 2 is Figure 1 The controller 1 is fixedly mounted on a base plate 5, on which a blackbody module 3 is also fixed. The blackbody module 3 and the controller 1 are located on either side of the base plate 5 in the longitudinal direction. The blackbody module 3 and the controller 1 are spaced apart from each other so that the temperature control of the blackbody module 3 and the controller 1 are independent of each other, thereby avoiding interference during temperature adjustment.

[0022] Please refer to Figure 3 The blackbody module 3 forms a temperature-adjustable blackbody cavity within which the terahertz wave receiving end of the detector body 2 is embedded. Multiple detector bodies 2 are provided, each with its own terahertz wave receiving end embedded within the blackbody cavity. The base plate 5 is intrinsically connected to the mounting plate 6 via connecting posts. This mounting plate 6 is provided with retaining grooves corresponding to each detector body 2. The ends of the retaining grooves extend through the mounting plate 6 along its width. When the detector body 2 is inserted into the blackbody cavity, it snaps into place within these retaining grooves.

[0023] Specifically, if Figure 3-5 As shown, the blackbody module 3 includes a second housing 31 and a heating plate 32 located on one side of the second housing 31. The heating plate 32 is provided with an absorbing material 33 for absorbing terahertz waves. A temperature probe 34 is provided on the side of the heating plate 32 away from the absorbing material 33. The second housing 31, the heating plate 32, and the absorbing material 33 form a blackbody cavity. The cross-section of the absorbing material 33 is in the shape of a U-shaped triangle. The outer surface of the absorbing material 33 is respectively in contact with the side walls, bottom wall, and top wall of the heating plate 32 and the second housing 31. Figure 2 and Figure 3 In order to show the internal structure of the blackbody cavity, the top wall of the second shell 31 and the top of the absorbing material 33 are removed. The electric heating plate 32 is arranged opposite to the detector body 2, and the terahertz wave receiving end of the detector body 2 passes through the side wall of the electric heating plate 32 away from the absorbing material 33.

[0024] During the NETD detection process, the detector body 2 is powered by the controller 1, and the controller 1 performs PWM control on the electric heating plate 32, thereby controlling the temperature of the blackbody cavity. The temperature probe 34 on the electric heating plate 32 performs real-time temperature detection on the electric heating plate 32 and sends the collected temperature data to the controller 1. The controller 1 adjusts the power of the electric heating plate 32 according to the temperature data measured by the temperature probe 34, and receives the voltage data fed back by the detector body 2. After the controller 1 sends the voltage data and temperature data to the host computer, the host computer calculates the NETD parameters of the detector body 2 based on the voltage data and temperature data. The calculation formula of the NETD parameter is as follows: in, is the noise equivalent temperature difference parameter of the detector body 2, which is also called thermal sensitivity. is the average value of the voltage data fed back by multiple detector bodies 2, It is the slope of the curve between the voltage fed back by a single detector body 2 and the temperature measured by the temperature probe 34.

[0025] Further, such as Figure 2 As shown, in order to improve the measurement accuracy, a device cooling fan 13 is set on the controller 1 and a blackbody cooling fan 35 is set on the blackbody module 3. The controller 1 and the blackbody module 3 are cooled independently to avoid mutual interference in the temperature control of the controller 1 and the blackbody module 3. For details, please refer to Figure 2 and Figure 6 The controller 1 includes a housing 11 and a control board 12, which is located inside the housing 11. A mounting plate 36 is fixedly mounted on one side of the housing 31, and a temperature probe 34 is mounted between the mounting plate 36 and the heating plate 32. Furthermore, a partition 37 is positioned between the heating plate 32 and the absorbing material 33. The absorbing material 33 is adhered to the inside of the partition 37, and the heating plate 32 is fixedly mounted on the outside of the partition 37. The inside of the partition 37 is the side of the partition 37 that is close to the detector body 2, while the outside of the partition 37 is the side of the partition 37 that is away from the detector body 2.

[0026] Housing 1 (11) has an air inlet and outlet at each end, and a cooling fan (13) is installed on the outlet of housing 1 (11). This fan provides a constant temperature for the control board (12), enabling low-noise power supply to the detector body (2). Similarly, housing 2 (31) also has an air inlet and outlet at each end, and a blackbody cooling fan (35) is installed on the outlet of housing 2 (31). Protective nets (4) are installed on the air inlets of housings 1 (11) and 2 (31), as well as the cooling fans (13) and (35). These protect the user's fingers from being cut by the fans and also provide dust protection.

[0027] The control board 12 includes a PCB, a slave computer 121, and a device thermometer and hygrometer 122 mounted on the PCB. An ambient thermometer and hygrometer are located outside the housing 11. The slave computer 121 performs PWM control of the device cooling fan 13 based on temperature data measured by the device thermometer and hygrometer 122 and the ambient thermometer and hygrometer. The control board 12 also includes an AC power modulation module 123 and a relay module mounted on the PCB. The control board 12 uses the AC power modulation module 123 to perform PWM control of the electric heating plate 32, and regulates the detector body 2 and the blackbody cooling fan 35 through the relay module. The temperature probe 34 is preferably a digital high-precision thermometer that accurately measures the temperature of the electric heating plate 32 and implements PID closed-loop control of the blackbody cavity temperature, with a temperature control accuracy of ±0.2°C. A DC power supply 14 is also located within the housing 11 of the controller 1 to provide power to the control board 12. The controller 1 distributes power from the DC power supply 14 to the detector body 2, the device cooling fan 13, the blackbody cooling fan 35, and the electric heating plate 32 through the control board 12.

[0028] The relay module is divided into relay 1 124 and relay 2 125, and relay 1 124 and relay 2 125 are both arranged on the above-mentioned PCB board. The slave computer 121 is preferably an STM32 single-chip microcomputer, which provides a +5V power supply to the detector body 2 through relay 1 124, and provides a +12V power supply to the blackbody cooling fan 35 through relay 2 125. The STM32 single-chip microcomputer supplies power to the blackbody cooling fan 35 and the detector body 2 through the relay module. Relay 1 124 and relay 2 125 protect the detector body 2 and the blackbody cooling fan 35. The PCB board of the control board 12 is also provided with a serial communication module 126, through which the STM32 single-chip microcomputer exchanges data with the host computer. The STM32 microcontroller collects the temperature of the temperature probe 34, provides feedback on the set target temperature, and then calculates based on the PID parameters. The STM32 microcontroller generates a PWM signal to change the AC power output by the AC power regulation module 123, thereby changing the heating power of the electric heating plate 32. In this way, the temperature of the electric heating plate 32 can be accurately controlled.

[0029] During the NETD parameter test of the detector body 2, the internal and external temperature and humidity of the controller 1 are measured using the device thermo-hygrometer 122 and the ambient thermo-hygrometer, respectively. NETD parameter testing is performed in an environment with moderate humidity. During testing, the control board 12 analyzes the temperature difference between the inside and outside of the controller 1 based on the temperature data measured by the device thermo-hygrometer 122 and the ambient thermo-hygrometer. It then adjusts the power of the device cooling fan 13 accordingly, achieving constant temperature control of the controller 1. This prevents unstable power supply voltage to the detector body 2 caused by temperature fluctuations in the controller 1, allowing the control board 12 to provide low-noise power to the detector body 2. This enhances NETD parameter detection accuracy. During NETD parameter measurement, the heating plate 32 must be heated from room temperature to approximately 80°C and then returned to room temperature before the next measurement can be performed. The STM32 microcontroller controls the blackbody cooling fan 35 to rapidly cool the heating plate 32.

[0030] Second embodiment like Figure 1 As shown, this embodiment relates to a terahertz detector NETD intelligent detection method, which is applicable to the terahertz detector NETD intelligent detection system of the previous embodiment. The method specifically includes the following steps: S1. Separate the controller 1 from the blackbody module 3 and connect the controller 1 to the detector body 2 and the host computer so that the terahertz wave receiving end of the detector body 2 is embedded in the blackbody cavity of the blackbody module 3.

[0031] S2. Controller 1, combined with the temperature data measured by temperature probe 34, adjusts electric heating plate 32 to heat the blackbody cavity and receives voltage data fed back from detector body 2. Controller 1 also detects the temperature and humidity inside and outside controller 1 using device thermometer and hygrometer 122 and an ambient thermometer and hygrometer, and maintains a constant temperature through device cooling fan 13. This allows controller 1 to provide low-noise power to detector body 2.

[0032] S3. The controller 1 sends the voltage data and temperature data to the host computer. The host computer calculates the NETD parameter of the detector body 2 based on the voltage data and temperature data. The calculation formula of the NETD parameter is as follows: in, is the noise equivalent temperature difference parameter of the detector body 2, which is also called thermal sensitivity. is the average value of the voltage data fed back by multiple detector bodies 2, It is the slope of the curve between the voltage fed back by the detector body 2 and the temperature measured by the temperature probe 34.

[0033] In addition, after each NETD parameter detection, the controller 1 uses the blackbody cooling fan 35 to dissipate heat from the blackbody module 3, and the temperature of the heating plate 32 is restored to room temperature before the next measurement can be performed. The subsequent measurement repeats the above steps S1-S3.

[0034] Third embodiment This embodiment relates to a storage medium having computer program instructions stored thereon. When the computer program instructions are executed by a processor, the terahertz detector NETD intelligent detection method in the previous embodiment can be implemented, thereby measuring the NETD parameters of the detector body 2.

[0035] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A terahertz detector NETD intelligent detection system, comprising a controller (1), a detector body (2) connected to the controller (1), and a host computer, characterized in that: The intelligent detection system further comprises a blackbody module (3) remote from the controller (1), wherein a temperature-adjustable blackbody cavity is formed inside the blackbody module (3), and the terahertz wave receiving end of the detector body (2) is embedded in the blackbody cavity; The blackbody module (3) includes a second housing (31) and an electric heating plate (32) provided on one side of the second housing (31), wherein the electric heating plate (32) is provided with an absorbing material (33) and a temperature probe (34), and the second housing (31), the electric heating plate (32) and the absorbing material (33) constitute the blackbody cavity; The controller (1) adjusts the electric heating plate (32) according to the temperature data measured by the temperature probe (34), and receives the voltage data fed back by the detector body (2). After the controller (1) sends the voltage data and the temperature data to the host computer, the host computer calculates the NETD parameter of the detector body (2) based on the voltage data and the temperature data.

2. The terahertz detector NETD intelligent detection system according to claim 1, characterized in that: The controller (1) includes a housing (11) and a control board (12) arranged inside the housing (11). An air inlet and an air outlet are respectively provided at both ends of the housing (11), and a device cooling fan (13) is provided on the air outlet of the housing (11). The device cooling fan (13) is used to provide a constant temperature environment for the control board (12) so that the control board (12) can provide low-noise power to the detector body (2).

3. The terahertz detector NETD intelligent detection system according to claim 2, characterized in that: The two ends of the second shell (31) are respectively provided with an air inlet and an air outlet, and a black body heat dissipation fan (35) is provided on the air outlet of the second shell (31).

4. The terahertz detector NETD intelligent detection system according to claim 3, characterized in that: The air inlets of the housing 1 (11) and the housing 2 (31), as well as the equipment cooling fan (13) and the blackbody cooling fan (35) are all provided with protective nets (4).

5. The terahertz detector NETD intelligent detection system according to claim 4, characterized in that: The control board (12) includes a PCB board and a lower computer (121) and a device thermometer and hygrometer (122) arranged on the PCB board. An environmental thermometer and hygrometer is provided on the outside of the housing (11). The lower computer (121) performs PWM control on the device cooling fan (13) according to temperature data measured by the device thermometer and hygrometer (122) and the environmental thermometer and hygrometer.

6. The terahertz detector NETD intelligent detection system according to claim 5, characterized in that: The control board (12) further includes an AC power regulation module (123) and a relay module arranged on the PCB board; the control board (12) regulates the electric heating plate (32) through the AC power regulation module (123), and regulates the detector body (2) and the blackbody cooling fan (35) through the relay module.

7. The terahertz detector NETD intelligent detection system according to claim 1, characterized in that: The detector bodies (2) are provided in plurality, the terahertz wave receiving end of each detector body (2) is embedded in the black body cavity, and the electric heating plate (32) is arranged opposite to the detector body (2).

8. The terahertz detector NETD intelligent detection system according to claim 7, characterized in that: The system further comprises a base plate (5) and a mounting plate (6) fixed on the base plate (5); the controller (1) and the blackbody module (3) are respectively fixed on two sides of the base plate (5); and the mounting plate (6) is provided with limit grooves corresponding one to one with the detector body (2).

9. A terahertz detector NETD intelligent detection method, characterized in that: The method is based on the system according to any one of claims 1 to 8, and comprises the following steps: S1, separating the controller (1) from the blackbody module (3), and connecting the controller (1) to the detector body (2) and the host computer, so that the terahertz wave receiving end of the detector body (2) is embedded in the blackbody cavity of the blackbody module (3); S2, regulating the electric heating plate (32) by combining the temperature data measured by the temperature probe (34) through the controller (1) to heat the blackbody cavity, and receiving the voltage data fed back by the detector body (2); S3, sending the voltage data and temperature data to a host computer via the controller (1), and the host computer calculating the NETD parameters of the detector body (2) based on the voltage data and temperature data.

10. A storage medium having computer program instructions stored thereon, characterized in that: When the computer program instructions are executed by a processor, the terahertz detector NETD intelligent detection method according to claim 9 is implemented.

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