Infrared signal detection circuit

A technology for detecting circuits and infrared signals, applied in signal transmission systems, non-electrical signal transmission systems, instruments, etc., can solve problems such as dynamic response errors, achieve good signal-to-noise ratio, high sensitivity and stability, and compact circuit structure Effect

Inactive Publication Date: 2017-06-20
韩会义
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  • Abstract
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  • Application Information

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Problems solved by technology

In the field of weapons, the transient temperature changes quickly with time, often on the order of microseconds. The thermal inertia and

Method used

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  • Infrared signal detection circuit
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  • Infrared signal detection circuit

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[0016] The present invention will be further described below with reference to the drawings and embodiments.

[0017] Such as figure 1 , The power circuit adopts a DC-DC converter chip, LTC3260 can convert +15V voltage into ±12V to supply power to the amplifier. In the preamplifier circuit, the DC power supply will produce clutter and ripple, and the common mode voltage that may be coupled to the power supply. These pulsating noises are in the order of microvolts and will affect useful signals.

[0018] Such as figure 2 In the bias circuit, electronic crosstalk can be eliminated by increasing the bias resistance. The output signal and noise of the infrared detector will change with the magnitude of the bias current. It has an optimal bias range, so that the output signal-to-noise ratio reaches the maximum. The optimal bias current of the infrared detector in the system is 2mA~4mA. The circuit uses the transistor's collector-emitter equivalent AC resistance to be very large when t...

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Abstract

An infrared signal detection circuit relates to an infrared signal detection circuit, which is suitable for the field of temperature sensor calibration. The infrared signal detection circuit is composed of a power supply circuit, a bias circuit and an amplifier circuit. The circuit utilizes the characteristics of the transistor to realize the constant current bias and form the transistor constant current bias circuit by utilizing the characteristic that the equivalent AC resistance of the transistor is very large when it works in the linear region, and it is similar to the characteristics of a constant current source. The circuit structure is compact, has good signal-to-noise ratio, can amplify weak signals, and has high sensitivity and stability.

Description

[0001] Technical field [0002] The invention relates to an infrared signal detection circuit, which is suitable for the field of temperature sensor calibration. Background technique [0003] With the increasing demand for transient temperature testing, the dynamic characteristics of temperature sensors have become the focus of researchers. In the field of weapons, the transient temperature changes rapidly with time, often on the order of microseconds. The thermal inertia and limited heat conduction of the temperature sensor cause a dynamic response error between the measured temperature and the actual temperature. In order to reduce this kind of error, the temperature sensor needs to be calibrated dynamically to compensate for the existing dynamic error. The HgCdTe photoconductive infrared detector is a key component of the traceable dynamic calibration system. Its peak detection rate is not less than 5x109 cmHz1 / 2 W-1, and its response rate is 1us faster than the temperatur...

Claims

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Application Information

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IPC IPC(8): G08C23/04G08C25/00
CPCG08C23/04G08C25/00
Inventor 韩会义
Owner 韩会义
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