Frosting and dewing preventing device special for low-temperature blackbody radiation source

Abstract

The invention relates to a frosting and dewing preventing device special for a low-temperature blackbody radiation source. A heating device, a three-way electromagnetic valve, a refrigerating device,a solid-state relay and the like are installed in a shell, moisture in air is evaporated through a furnace body, a humidity sensor measures the humidity value in gas and then sends the humidity valueto the three-way electromagnetic valve, when the humidity value is greater than a set value, the electromagnetic valve is in a closed state, and the gas is exhausted into the environment through an exhaust pipe; when the humidity value reaches a set value, the electromagnetic valve is switched on to enable gas to enter the condenser for cooling; the obtained dry gas is enabled to pass through a filter; impurity particles in the dry gas are removed and then the dry gas enters the low-temperature blackbody radiation source cavity. The pressure of dry gas in the cavity space is greater than the ambient pressure, gas containing moisture is effectively prevented from entering the cavity to be condensed into frost and dew, and the device is safe, reliable, good in temperature stability, low in cost, high in working efficiency, beneficial to measurement of infrared optical instrument and meter equipment and more beneficial to use in narrow and small space.

Description

Technical field [0001] The invention relates to the technical field of optical characteristics, in particular to a special anti-frosting and dew device for a low-temperature black body radiation source. Background technique [0002] In the use of a low-temperature blackbody radiation source, its low-temperature characteristics will condense the moisture in the air into frost in the blackbody cavity, which will block the observation of infrared instruments and equipment, thereby affecting the accuracy of its measurement. [0003] At present, the commonly used method to prevent frost and condensation is to deliver dry compressed air or compressed nitrogen into the cavity of the low-temperature blackbody radiation source, so that the pressure of the dry gas is greater than that of the environment to prevent the gas containing moisture from entering the cavity to condense. Frost dew. [0004] Its disadvantages are: On the one hand, this method requires canned gas or air compressor to pr...

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Problems solved by technology

[0004] The disadvantages are: on the one hand, this method needs to use canned gas or an air compressor to provide dry gas, which is heavy and noisy, and the use time of the canned gas is limited. Usually, the continuous delivery of gas will not exceed three hours. It needs to be refilled every time it is used. It is difficult to transport, and every time it needs to be filled, it will cost a lot for long-term use. If there is no spare canned gas, the low-temperature blackbody radiation source will not work normally, which will affect the work efficiency.

On the other hand, being bulky, the device cannot be used in tight spaces

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