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Time-sharing power supply and data acquisition system for photoconductive infrared detector array

A technology of data acquisition system and infrared detector, which is applied in the direction of using electric radiation detectors for photometry, etc., can solve the problems of baseline drift of the detector driving circuit, affecting the dynamic range of the measurement system, and being sensitive to the ambient temperature. Accuracy, satisfying long-term work, ensuring the effect of dynamic range

Active Publication Date: 2015-08-12
NORTHWEST INST OF NUCLEAR TECH
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Problems solved by technology

However, when the measurement takes a long time, such as tens of seconds or even several minutes, since the n-way detector and the bridge amplifier drive unit are powered for a long time at the same time, a large amount of heat generated by the circuit will cause the internal temperature of the measurement system to rise, while the infrared Photoconductive detectors are not only sensitive to the input mid-infrared optical power, but also to the ambient temperature, which causes the baseline of the detector drive circuit to drift, seriously affecting the dynamic range of the measurement system

Method used

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  • Time-sharing power supply and data acquisition system for photoconductive infrared detector array
  • Time-sharing power supply and data acquisition system for photoconductive infrared detector array
  • Time-sharing power supply and data acquisition system for photoconductive infrared detector array

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Embodiment

[0079] 16-channel photoconductive mid-infrared HgCdTe detector is used to measure the circular laser spot, the spot size is φ40mm, and the photosensitive surface of the unit detector is 2*2mm. We designed a detector board of 52*52mm to install and fix the 16-channel detector. In order to prevent the photodetector from being saturated or even damaged due to strong light irradiation, an attenuation sheet is fixed in front of the detector of each unit to adjust the incident laser power to the range of the detector.

[0080] Assuming that the dark resistance R2 of the photoconductive HgCdTe detector is 100Ω at a room temperature of 23°C, and the bias resistance R1 of the measuring arm is set at 2kΩ, even under strong optical power irradiation, the internal resistance of the detector reaches 80Ω , the total resistance Rmea of ​​the measuring arm changes from 2.1kΩ to 2.08kΩ, and basically remains unchanged. In the reference arm, in order to reduce the shunt as much as possible, the...

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Abstract

The invention discloses a time-sharing power supply and data acquisition system used for a photoconductive type infrared detector array. The time-sharing power supply and data acquisition system comprises a constant-current source, an input multi-channel analog switch, an output multi-channel analog switch, a data acquisition and processing unit and n bridge type amplification drive units corresponding to photoconductive type infrared detectors one to one, wherein the gating end of the input multi-channel analog switch and the gating end of the output multi-channel analog switch can conduct synchronous gating on the same bridge type amplification drive unit under the action of a drive level so that synchronous power supply and data acquisition can be conducted on measuring units. The time-sharing power supply and data acquisition system effectively solves the problem that the photoconductive type infrared detectors and drive circuits give out heat in the continuous working process, the baseline drift caused by temperature rising of the detectors is avoided, the dynamic range is ensured, and the requirement of a measuring system for long-time working is met.

Description

technical field [0001] The invention relates to the field of detectors and data acquisition, in particular to a time-sharing power supply and data acquisition method and device for a mid-infrared photoconductive detector array. Background technique [0002] Mid-infrared photoconductive detectors such as mercury cadmium telluride (HgCdTe), indium antimonide (InSb), lead sulfide (pbS), etc. play an important role in mid-infrared laser detection. These detectors form an array and can be used to measure the spatial and temporal distribution of the mid-infrared laser with a large spot. [0003] Existing photodetector arrays for measuring mid-infrared laser spots usually use such as figure 1 The bridge-type amplifying drive unit 6 shown with a stabilized voltage supply includes an amplifier 5 and a balanced bridge composed of a measurement arm 22 and a reference arm 21. The measurement arm 22 is composed of a bias resistor 1 and a detector 2. The reference arm 21 is composed of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/42
Inventor 赵军卫冯刚王振宝杨鹏翎陈绍武冯国斌陶蒙蒙闫燕张磊
Owner NORTHWEST INST OF NUCLEAR TECH
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