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Analysis of the advantages and limitations of radar thermocouple

2020-11-12

JVTIA

189

Very low energy is emitted by a radar thermocouple extremely short microwave pulse by transmitting and receiving antenna system, microprocessor to signal processing, identify the micro pulse produced by the echo in the material surface. Suitable for liquid, paste, and granular material a non-contact continuous measurement.

thermocouple as a kind of widely used radar thing location detection instrument, there are a lot of advantages. Even if the environment temperature, pressure is very big, presence of inert gas and volatile, radar thermocouple can also be applied. Because use microwave pulse measurement, so the ability to work within the scope of industrial frequency band. Thermocouple radar beam energy is low, so will not cause harm to human body and environment. Radar thermocouple

but there are still some limitations. Mainly embodies the influence of the dielectric constant of the radar. Although radar in a vacuum attenuation, but it will be affected in the air. Especially when the air contains high dielectric properties of dust powder ( Graphite, ferroalloy, etc. ) , water vapor is very big, and so on and so forth, will cause a certain degree of attenuation to radar, affect the measurement results.

in addition, the radar thermocouple of measured medium dielectric constant cannot too small, at the same time, if the medium to be measured on the antenna of volatile coalescence effect to return to the launch of the radar wave. Although minimal temperature and pressure influence on radar, the radar antenna materials are influenced by environmental temperature and pressure.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure thermocouple sensor, digital temperature thermocouple sensor

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