A fast-response armored resistance temperature sensor and its packaging method

Abstract

The invention discloses a rapid response armoured resistance-type temperature sensor and a packaging method thereof. According to the sensor, a metal silver material with a highest heat conduction coefficient and low heat specific volume is selected as a material of a temperature sensing portion, a non-metal insulation nanometer aluminum nitride material with superhigh heat conduction coefficient and quite low heat specific volume is selected as a filling material, so small heat resistance and rapid temperature rising speed are realized under same conditions. The sensor is advantaged in that small heat resistance, low heat volume and rapid response speed are realized, a thermistor is directly attached to an inner end face of a silver sheath into one body, heat is transmitted from a detected medium to the thermistor only through the metal sheath, a heat conduction path is shortened, the heat conduction coefficient of the sheath material is quite high, so the thermistor can be heated to the temperature same as the detected medium in a short time, and the temperature response time is shortened.

Description

technical field [0001] The invention belongs to the field of sensors, and in particular relates to a fast-response armored resistance temperature sensor and a packaging method thereof. Background technique [0002] The temperature sensor is a very widely used sensor at present. It has many structures, principles and methods. Due to its small size, simple structure, stable and reliable performance, and easy maintenance, the armored resistive temperature sensor is suitable for measuring the temperature of liquid and gas in the tube. Has been widely used. However, due to structural limitations, the traditional armored thermal resistance temperature sensor has a relatively long temperature response time, and there are relatively large deficiencies in the application of rapid temperature changes and the need to use the temperature measurement results as closed-loop control, especially in the application of In terms of temperature measurement of gases, the reaction speed is parti...

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Problems solved by technology

Due to the relatively small thermal conductivity of stainless steel materials and packaging materials, the transmission from the measured medium to the thermistor must go through the sheath and filling materials, and the thermal resistance from the shell to the thermistor is relatively large, and the thermal specific capacity of the above two materials is relatively large. Larger, the heat required to raise or lower the same temperature under the same conditions will be more and the time will be longer, and when the measured medium is gas, due to the small gas density and relatively small thermal specific capacity, the above materials are used The thermal response is slower

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