Sapphire optical fiber temperature sensor using separate type probe

Abstract

The invention provides a sapphire optical fiber temperature sensor using a separate type probe. The sapphire optical fiber temperature sensor using the separate type probe is manufactured according to the following steps of: designing and manufacturing a probe temperature sensing black body cavity, a thermal insulation protective casing and relevant mounting accessories of a sensor based on specific conditions of a medium subjected to temperature measurement; assembling a probe; designing and manufacturing a converter which includes a light filter, a photoelectric switching circuit, a preposed amplification electric circuit, a two-stage amplifying circuit, an analog signal conditioning circuit, a voltage output circuit, a power voltage stabilizing circuit and a voltage switching circuit; finally connecting the probe with the converter by using a quartz transmission optical fiber bundle. According to the invention, the black body cavity is separated from the sapphire optical fiber, the sapphire optical fiber has no direct contact with the temperature sensing black body cavity, and the sapphire optical fiber is relatively far away from a high-temperature environment during the temperature measurement, so that the sapphire optical fiber with the temperature lower than a degradation temperature thereof still can transmit black body radiation signals normally when the temperature of the environment where the temperature sensing black body cavity is located is up to 2600 DEG C, and accordingly the upper limit of the temperature measurement of the sensor is up to 2600 DEG C.

Description

technical field [0001] The invention belongs to the technical field of temperature measurement, and in particular relates to an improved sapphire optical fiber temperature sensor. Background technique [0002] The sapphire fiber optic temperature sensor is a contact temperature sensor that collects the thermal radiation of a high-temperature black body cavity for measurement according to Planck's law. The sapphire fiber temperature sensor utilizes the characteristics of high melting point of sapphire fiber and good light transmission characteristics under high temperature conditions. The radiation signal of the balanced black body is transmitted to the low temperature environment. By measuring the intensity of the radiation signal, the temperature of the black body cavity can be converted according to the corresponding relationship between the intensity of the radiation energy and the temperature of the black body cavity, so as to obtain the temperature of the measured mediu...

AI Technical Summary

Problems solved by technology

[0003] Since the sapphire fiber is in a temperature environment above 1700°C, the surface will be degraded due to high temperature, which will affect the temperature measurement accuracy and long-term stability

Even after the relevant anti-deterioration treatment, the upper limit of the sapphire optical fiber's tolerance can only be increased to 1800 °C, which leads to the upper limit of the temperature measurement of the traditional sapphire temperature sensor being limited to 1800

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