Noise reduction circuit and temperature measuring apparatus equipped with the same

Abstract

The output signal value exported by a thermopile being composed of a light-absorption unit is very small, and the output signal value is displayed on a display device after being amplified by an amplifier. The output signal is a factor which is easily affected by noise and measurement errors. If the noise and the measurement errors are interfused, the problem that aberrance is generated in the self-temperature distribution, and displayed objects can not be identified can occur. A temperature measurement and processing device of the invention is provided with a light-absorption part which measures relative temperature difference between each monitoring field in a noncontact way, a temperature measurement circuit which measures the self temperature of the light-absorption part, and a calculation circuit which uses the temperature measurement circuit to calculate the temperature and the relative temperature difference, calculate the temperature in each monitoring field and export calculated results. The calculation circuit is provided with a wave filtering processing part and an average processing part, and the average processing operation is performed after performing the wave filtering processing operation.

Description

technical field [0001] The present invention relates to a temperature measurement processing device for detecting a fire or the presence of a person or the temperature of an object by performing thermal image detection using heat radiated from an object, such as far infrared rays. Background technique [0002] A thermocouple is a device that generates DC voltage by using the Seebeck effect that converts incident far-infrared rays into heat even with tiny far-infrared rays generated by the human body, and converts heat directly into electricity. [0003] The above-mentioned so-called Seebeck effect is that when two ends of metal wires of different types are connected, if the junction at one end is heated and the other end is cooled, thermoelectromotive force is generated. It is called the characteristic of generating this thermal electromotive force. The sensor that uses this effect to measure the temperature difference between the junctions from the magnitude of the thermoe...

AI Technical Summary

Problems solved by technology

[0013] However, in the above-mentioned background art, there arises a problem that the temperature distribution in the detected area is displayed on the display using the light receiving unit arranged in each area divided into the detected area.

[0014] If noise or measurement error is mixed, there is a problem that distortion occurs in the temperature distribution itself, and the displayed object cannot be recognized

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