White-light interference high-temperature measuring sensor and application measuring device thereof

Abstract

The invention provides a white-light interference high-temperature measuring device, which comprises a sensor, a white-light light source, a spectrograph and a data processor, wherein the sensor comprises a collimation lens, a polarizer and a sapphire right-angle prism, and the sapphire right-angle prism is used as a temperature sensing component. Light emitted from the white-light light source passes through an incident optical fiber to enter the collimation lens, and then becomes parallel light; the parallel light is divided into o light and e light by the polarizer; the o light and the e light are further transmitted to the sapphire right-angle prism; the sapphire right-angle prism reflects the o light and the e light back; the o light and the e light which are reflected back pass through the polarizer again to be interfered to obtain interfered light; the interfered light passes through the collimation lens, then is converged at a receiving optical fiber, and enters the spectrograph; the spectrograph carries out stripe detection on the interfered light, and conveys the detected spectral interfered stripe data to the data processor; and the data processor processes the interfered stripe data conveyed from the spectrograph and calculates out a temperature. The high-temperature measuring device has the advantages of high temperature resistance, corrosion resistance, high measurement precision, convenience in mounting, low cost and wide application aspect.

Description

[technical field] [0001] The invention relates to the technical field of temperature detection, in particular to an optical fiber sensing high temperature measurement sensor based on white light interference and an application measurement device thereof. [Background technique] [0002] In various industrial production processes, such as electric power, metallurgy, ceramics, glass, chemical industry, cement and other industries, the accurate measurement and monitoring of high temperature is of great significance. At present, there are mainly two types of high 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, and sound wave temperature measurement technology, etc. These technologies all have some shortcomings. Thermocouples made of precious metals such as platinum and rhodium have poor oxidation resistance at high temper...

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, the blackness of the measured area has a great influence on the measurement result, the space stray light affects the measurement accuracy, and the measurement environment atmosphere (such as water vapor, etc.) causes errors due to the uneven absorption of light waves; Due to the pollution of the flame image temperature measurement lens and the complex image processing algorithm, the measurement error is large, the resolution is not high, and "peeking" is easy to occur, the lighting system is complex, and there are many installation points of the CCD camera. Coking or dust accumulation makes the maintenance of the lens difficult. The reliability is poor and the price is 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. The high-frequency noise generated during boiler soot blowing affects the normal operation of the sound wave temperature measurement system The ambient temperature at the installation location of the generating and receiving device is high, and reliable cooling is required to avoid damage to the measuring device

The sapphire high-temperature optical fiber temperature measurement technology that has emerged in recent years combines contact and non-contact temperature measurement methods. Although some shortcomings of non-contact temperature measurement have been partially overcome, due to the high price of sapphire optical fiber, limited fiber length, and common Due to factors such as the complexity of optical fiber connection technology, its industrial application is subject to certain restrictions

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