Pyroelectric infrared readout circuit

Abstract

The invention provides a pyroelectric infrared readout circuit, comprising: a detector, used to detect the infrared radiation of the target to be measured, and convert the detected infrared radiation into an electrical signal; an amplifier, used to amplify the electrical signal , so as to obtain the infrared radiation of the target to be measured from the output of the amplifier, wherein the detector uses a phase-change pyroelectric material whose dielectric constant changes with temperature to detect the infrared radiation of the target to be measured. The pyroelectric infrared readout circuit of the embodiment of the present invention can read the change of the equivalent capacitance of the phase-change pyroelectric material by adjusting the input bias voltage, thereby reading the infrared radiation of the measured target, so there is no need for a traditional infrared thermometer The chopper in the discharge readout circuit reduces power consumption, volume and quality.

Description

technical field [0001] The invention relates to the field of infrared pyroelectric detectors, in particular to a pyroelectric infrared readout circuit. Background technique [0002] According to Planck's radiation theorem, any object with a temperature higher than absolute zero will have molecular thermal motion inside it, thereby producing infrared radiation with different wavelengths. Infrared radiation has an important feature that its intensity and wavelength are directly related to the surface temperature of the object, providing rich information about the object. However, infrared radiation is an invisible electromagnetic wave. When using infrared radiation to obtain information about objects, it is necessary to convert this infrared radiation into a measurable signal. [0003] At present, traditional pyroelectric materials are generally used to measure infrared radiation. [0004] Traditional pyroelectric materials work by using the characteristic that the spontaneo...

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Problems solved by technology

However, the chopper will consume a large power consumption, and it is not conducive to the miniaturization of the detector. On the other hand, when the temperature difference between the target and the temperature of the chopper is large, it is likely that the output will be saturated because the induced current is too large. Affect image quality

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