Pyroelectric detector

Abstract

The invention provides a pyroelectric detector which comprises a shell, a response element and a signal output interface, wherein the response element comprises a conductive substrate, a polarized CaCu3Ti4O12 film and a conductive transparent material film which are sequentially stacked; the response element is positioned in the shell; the shell is provided with a transparent window used for collecting outside electromagnetic radiation; the conductive substrate is used as a lower electrode, the conductive transparent material film is used as an upper electrode; the upper electrode and the lower electrode are electrically connected with the signal output interface; and the upper electrode faces to the transparent window. The response element has higher pyroelectric coefficient, thereby being capable of improving the sensitivity and the detectivity of the detector. Compared with other pyroelectric detectors, a power supply is connected in parallel with two electrodes of the response element, the invention ensures that the response speed of the detector is greatly improved, is beneficial to maintaining the polarization characteristic of a pyroelectric material, and prolongs the service life of elements.

Description

technical field [0001] The invention relates to the technical field of pyroelectric detection, in particular, the invention relates to a pyroelectric detector. Background technique [0002] Pyroelectric detectors are usually packaged by a combination of single or double response elements. If the pyroelectric coefficient of the response element is low, a signal amplification circuit can be connected, and the incident window is made of transparent materials within a specific wavelength range. The working principle of the pyroelectric detector is that after the pyroelectric element absorbs the external radiation, its temperature changes to generate a pyroelectric current, which is converted into a voltage signal by the amplifying circuit, and the information of the external radiation can be obtained by measuring the voltage signal. [0003] Pyroelectric detectors belong to uncooled infrared detection technology. This type of detector can work at room temperature, with low cost,...

AI Technical Summary

Problems solved by technology

However, due to the low pyroelectric coefficient of the currently used thin film materials, the sensitivity and signal-to-noise ratio are low, which in turn limits the responsivity and detectability of the detector.

In addition, the response speed of pyroelectric detectors based on thin-film pyroelectric materials is on the order of microseconds to milliseconds, which needs to be further improved

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