Medium-wave infrared optical system

Abstract

The invention provides a medium-wave infrared optical system which solves the problem of temperature field measurement in a nuclear reactor. The medium-wave infrared optical system comprises an anti-pollution protection window, an imaging group, a relay lens group, a correction lens group and a detector assembly. The light emitted by the optical system is imaged through the imaging group, an imageplane of the imaging group is coupled to an object plane of the correction lens group through the relay lens, the imaging quality is adjusted through the correction lens group, and the imaging information is collected by the detector assembly. The wavelength range is 3.7-4.8 microns, the field angle is 50 degrees, the entrance pupil diameter is 6.78 mm, the system F number is 2, the total lengthof the system is 1770 mm. The exit pupil is located on a cold diaphragm surface of the detector, so that the cold diaphragm matching is achieved, and the cold diaphragm efficiency is 100%. Except forthe detector assembly, 12 lenses are used in total, and four surfaces of the 12 lenses use the aspheric surfaces for ten times. The mid-infrared optical system has the advantages of being easy to machin and easy to install and adjust, being small in lens caliber and good in imaging quality and the like.

Description

technical field [0001] The invention belongs to the application field of infrared optics, and in particular relates to a mid-wave infrared optical system. Background technique [0002] In nature, when the temperature of an object is higher than absolute zero, due to the existence of its internal thermal motion, it will continuously radiate electromagnetic waves to the surroundings, including infrared rays with a band of 0.75-100um. Infrared temperature field measurement is made using this principle. Temperature is a physical quantity that measures the degree of coldness and heat of an object. It is a very common and important thermal parameter in industrial production. Many production processes require monitoring and monitoring of temperature. Control, especially in nuclear reactors, needs to accurately reflect the temperature field distribution and gauge size in different regions of the nuclear reactor. Traditional contact thermometers such as thermocouples, thermal resist...

AI Technical Summary

Problems solved by technology

Traditional contact thermometers such as thermocouples, thermal resistances, etc., need a certain period of time to reach thermal equilibrium due to sufficient heat exchange with the measured substance. There is a phenomenon of temperature measurement delay, and at the same time, it cannot directly reflect a certain measurement The temperature field distribution in the region, so there are certain limitations in the use of temperature field detection in nuclear reactors

[0003] Aiming at the limitations of traditional contact thermometers and the fact that the existing infrared thermometers on the market cannot meet the requirements of strong radiation of nuclear reactors, complex space light environment and large field of view temperature field monitoring and measurement, we invented an infrared thermometer that can meet the needs of nuclear reactors. Instruments or optical systems for temperature field monitoring and measurement play a vital role in improving the safety performance of nuclear reactors

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