Method for increasing signal-to-noise ratio of infrared radiometer by using internal temperature control technology

Abstract

The invention provides a method for increasing the signal-to-noise ratio of an infrared radiometer by using an internal temperature control technology. An optical system, a light filter, a field-of-view light barrier, a chopper, an ellipsoid reflector, a low background source and an infrared detector which constitute an infrared radiometer are encapsulated in a sealed chamber, a semiconductor cooler is mounted and fixed on the inner wall of the sealed chamber, and a temperature measuring platinum resistor is installed on one side of the infrared detector in the sealed chamber. A temperature controller is installed on the wall surface of the sealed chamber. The semiconductor cooler is connected with the temperature measuring platinum resistor and the temperature controller. The temperaturemeasuring platinum resistor collects the temperature of the space around the infrared detector in real time and feeds back the temperature to the temperature controller. The temperature controller makes the semiconductor cooler adjust the internal temperature of the infrared radiometer so as to keep the internal temperature of the infrared radiometer at a set temperature and increase the signal-to-noise ratio of the infrared radiometer. The problem of stray signal change caused by heating of components in a system can be solved by controlling the internal temperature of the system.

Description

technical field [0001] The invention belongs to the field of optical metrology, and relates to a method for improving the signal-to-noise ratio of an infrared radiometer, in particular to a method for improving the signal-to-noise ratio of an infrared radiometer by adopting an internal temperature control technology. Background technique [0002] Infrared radiation detection technology is widely used in many fields such as industry, medical treatment, national defense, information science, biotechnology, etc., such as temperature measurement of molten steel and steel ingots, hot junction detection, aircraft landing aids, high-voltage circuit temperature detection, thermal leak detection, human body temperature Non-contact measurement, small temperature difference detection of loose rocks in coal mines, etc., various infrared radiometers are the basic means to obtain infrared radiation characteristics. The existing infrared radiometer is composed of an optical system, an opti...

AI Technical Summary

Problems solved by technology

[0003] In the actual detection of infrared radiation, at present, the internal temperature of the infrared radiometer reaches thermal equilibrium through a long warm-up time, and then the measurement is started. The problem brought about is that the measurement efficiency is reduced, and it is greatly affected by the external ambient temperature. , when the external environment temperature changes greatly, it will cause a large change in the temperature inside the infrared radiometer, resulting in a large change in the stray radiation. The greater the change in the stray radiation, the greater the impact on the detection results, even Due to excessive noise, the signal of the detection equipment is saturated or severely distorted, resulting in measurement failure

Moreover, the continuously changing temperature in the infrared radiometer will also continuously change the signal-to-noise ratio of the measurement system. This change is irregular and difficult to eliminate in the measurement results by data processing.

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