A white light interference sapphire high temperature sensor

Abstract

The invention provides a white-light interference sapphire high-temperature sensor, which comprises a protecting sleeve, a collimation lens, a polarizer, a sapphire wafer and a reflector, wherein the collimation lens, the polarizer, the sapphire wafer and the reflector are positioned in the protecting sleeve and are sequentially arranged at intervals; the sapphire wafer and the reflector are positioned at the front end of the protecting sleeve; the sapphire wafer is used as a temperature sensing component; incident white light passes through the collimation lens to be collimated to become parallel light; the parallel light passes through the polarizer to be divided into o light and e light which pass through the sapphire wafer and are further reflected by the reflector; the o light and the e light which are reflected back pass through the sapphire wafer again and further pass through an analyzer to be interfered to obtain interfered light; and the interfered light passes through the collimation lens, and then is converged at a focal point of the collimation lens. The high-temperature sensor can be used in a corrosive environment at a temperature of 1800 DEG C, has the advantages of high temperature resistance, stable chemical performance and the like, is not influenced by water vapor and gas components in high-temperature gas, and has a wide application range; a high-temperature measuring head is a high-precision optical element; the measurement precision is high; the mounting is convenient; and the cost is low.

Description

[technical field] [0001] The invention relates to the technical field of high temperature measurement, in particular to a white light interference sapphire high temperature sensor. [Background technique] [0002] At present, there are mainly two types of high temperature gas temperature measurement: contact type and non-contact type. The contact type is mainly a thermocouple, and the non-contact type includes infrared temperature measurement, flame image temperature measurement, acoustic wave temperature measurement technology, sapphire fiber optic temperature measurement, etc. These technologies all have some shortcomings and shortcomings. Thermocouples made of precious metals such as platinum and rhodium have poor oxidation resistance at high temperatures, and large errors will occur in long-term use. Especially when working in some special and corrosive atmospheres, corrosion and poisoning will occur. Use Life expectancy is drastically shortened. In addition, thermocoup...

AI Technical Summary

Problems solved by technology

Thermocouples made of precious metals such as platinum and rhodium have poor oxidation resistance at high temperatures, and large errors will occur when used for a long time. Especially when working in some special and corrosive atmosphere environments, corrosion and poisoning will occur. Lifespan is drastically shortened

In addition, thermocouples have poor resistance to electromagnetic interference and cannot be used in some occasions

The water-cooled gun extraction thermocouple measurement equipment is cumbersome, the workload during the test is heavy, and the test is difficult; and it cannot be fixed for a long time to measure the flue gas temperature at a certain point, and it needs to exit after the test is completed

The measured area of ​​infrared temperature measurement is uncertain, and the measurement error is large; the influence of flame image temperature measurement lens pollution and complex image processing algorithms, etc., the measurement error is large, the resolution is not high, and "peeking" is easy to occur, the lighting system is complicated, and the CCD camera installation There are many points, coking or dust accumulation make lens maintenance difficult, poor reliability, and expensive; the principle of sound wave temperature measurement is based on ideal gas, and it is difficult to accurately determine various thermal parameters of flue gas, resulting in measurement errors. High-frequency noise affects the normal operation of the sound wave temperature measurement system. The ambient temperature of the sound wave generation and the installation location of the receiving device is high, and reliable cooling is required to avoid damage to the measurement device.

The existing sapphire high-temperature optical fiber temperature measurement technology combines contact and non-contact temperature measurement methods. Although some shortcomings of the aforementioned temperature measurement technology have been partially overcome, due to factors such as the high price of sapphire optical fiber and the complexity of ordinary optical fiber connection technology, its industrial application subject to certain restrictions

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