Current type terahertz pyroelectricity detector reading circuit

A pyroelectric detector and readout circuit technology, applied in the field of terahertz detection and imaging, can solve problems such as weak current, achieve low stability, eliminate power frequency signal interference, and filter power pulsation interference

Inactive Publication Date: 2014-07-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the output signal current of the terahertz pyroelectric detector is very weak, and the readout circuit still needs to be carefully designed

Method used

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  • Current type terahertz pyroelectricity detector reading circuit
  • Current type terahertz pyroelectricity detector reading circuit
  • Current type terahertz pyroelectricity detector reading circuit

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Embodiment Construction

[0025] The present invention will be further introduced below in conjunction with the accompanying drawings and embodiments.

[0026] A current-mode terahertz pyroelectric detector readout circuit, such as figure 1 As shown, it includes a current-voltage converter, a 50Hz trap circuit, a first-order low-pass filter amplifier circuit and a potential raising module. Among them, the signal output by the terahertz pyroelectric detector is input into the current-voltage converter, which is used to convert the current signal into a voltage signal; the signal output by the current-voltage converter is input into the 50Hz trap circuit, which is used to eliminate power frequency interference; 50Hz The signal output by the notch circuit is input into the first-order low-pass filter amplifier circuit for further signal amplification; the signal output by the first-order low-pass filter amplifier circuit is then input into the potential raising module, which is used to raise the voltage s...

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Abstract

The invention discloses a current type terahertz pyroelectricity detector reading circuit, and belongs to the field of terahertz detecting and imaging. The reading circuit comprises a current-voltage converter, a 50Hz trap circuit, a first-order lowpass filtering amplifying circuit and an electric potential raising module. Signals output by the terahertz pyroelectricity detector are input into the current-voltage converter so that the current signals can be converted into voltage signals; the signals output by the current-voltage converter are input into the 50Hz trap circuit so that power frequency interference can be eliminated; the signals output by the 50Hz trap circuit are input into the first-order lowpass filtering amplifying circuit so that the signals can be further amplified; the signals output by the first-order lowpass filtering amplifying circuit are input into the electric potential raising module so that a voltage can be raised and the voltage signals output by the circuit can be matched with a voltage required by a rear digital collecting circuit. The voltage signals output by the circuit are pure, and the circuit is suitable for collecting and outputting a weak current of the terahertz pyroelectricity detector.

Description

technical field [0001] The invention belongs to the field of terahertz detection and imaging, in particular to a readout circuit of a current-type terahertz pyroelectric detector. Background technique [0002] Terahertz (THz) wave is an electromagnetic wave with a frequency in the range of 0.1THz to 10THz, and a wavelength in the range of 30μm to 3mm, which is between microwave and infrared, and is a very important band in the electromagnetic spectrum. Compared with electromagnetic waves in other bands, terahertz radiation has unique and excellent properties such as wide frequency bandwidth, narrow pulse width, good coherence, and low energy. Pay attention to. Compared with other types of terahertz detectors, pyroelectric terahertz detectors have the advantages of miniaturization, wide-spectrum detection, low cost, and fast response, and are currently a widely studied THz detection technology. However, compared with pyroelectric detectors used for infrared imaging, the out...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/02
Inventor 黎威志樊霖李宁亮王军蒋亚东
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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