A sapphire fiber optic temperature sensor using a separate probe

Abstract

The invention provides a sapphire optical fiber temperature sensor using a separate probe, which is manufactured according to the following steps: design and manufacture the sensor's probe temperature-sensing black body cavity, heat-insulating protective sleeve and related installation accessories according to the specific conditions of the temperature-measured medium; assemble Probes; design and manufacture converters, which include optical filters, photoelectric conversion circuits, preamplifier circuits, two-stage amplifier circuits, analog signal conditioning circuits, voltage output circuits, power supply voltage stabilization circuits, and voltage conversion circuits; finally, use quartz transmission A fiber optic bundle connects the probe to the transducer. In the present invention, the blackbody cavity is separated from the sapphire optical fiber, and the sapphire optical fiber is not in direct contact with the temperature-sensitive blackbody cavity. During temperature measurement, the sapphire optical fiber is relatively far away from the high-temperature environment. The temperature is lower than its degradation temperature and still can transmit the blackbody radiation signal normally, so that the upper limit of the temperature measurement of the sensor reaches 2600 ℃.

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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