1.contact temperature sensor

The characteristics of the contact temperature sensor: the sensor directly contacts the measured object to measure the temperature. The heat of the measured object is transmitted to the sensor, which reduces the temperature of the measured object. Especially when the measured heat capacity is small, the measurement accuracy is low. .

In this way, the true temperature of the object is measured, provided that the heat capacity of the object to be measured is sufficiently large.

2, non-contact temperature sensor

The non-contact temperature sensor mainly performs the telemetry by using the heat radiation of the object to be measured and emitting infrared rays to measure the temperature of the object. The manufacturing cost is high and the measurement accuracy is low. The advantage is that it does not absorb heat from the measured object; it does not interfere with the temperature field of the measured object; continuous measurement does not cause consumption; the reaction is fast.

In addition, there are microwave temperature measurement temperature sensor, noise temperature measurement temperature sensor, temperature map temperature measurement temperature sensor, heat flow meter, jet thermometer, nuclear magnetic resonance thermometer, Moose Paul effect thermometer, Josephson effect test Temperature meter, low temperature superconducting conversion thermometer, fiber temperature sensor, etc.

(-) contact temperature sensor

1. Common thermal resistance

Range: -260 ~ +850 ° C;

Accuracy: 0.001 °C. After improvement, it can work continuously for 2000h, the failure rate is less than 1%, and the service period is 10 years.

2. Cable thermal resistance

The temperature range is -20 ~ +500 ° C, the upper limit is 1000 ° C, the accuracy is 0.5.

3. Ceramic thermal resistance

The measurement range is from –200 to +500 °C with an accuracy of 0.3 and 0.15.

4. Ultra low temperature thermal resistance

Two carbon resistors can measure temperatures from –268.8 to 253 °C-272.9 to 272.99 °C.

5. Thermistor

Suitable for use in high sensitivity and small temperature measurement applications. Good economy and cheap price.

(2) Non-contact temperature sensing

l. Radiation pyrometer

It is used to measure high temperatures above 1000 °C. There are four types: optical pyrometers, colorimetric pyrometers, radiant pyrometers, and photoelectric pyrometers.

2. Spectral pyrometer

Henan Minghai Optoelectronics Technology Co., Ltd. (www.hnminghai.cn) developed by the former Soviet Union YCI-I automatic temperature measurement general spectrum pyrometer, its measurement range is 400 ~ 6000 ° C, it is using electronic automatic tracking system, to ensure that there is enough Automatic measurement with accurate accuracy.

3. Ultrasonic temperature sensor

It is characterized by fast response (about 10ms) and strong directionality. At present, there are 5,000 °F products that can be measured abroad.

4. Laser temperature sensor

Suitable for temperature measurement in remote and special environments. For example, NBS uses a laser with a holmium laser source as a light reflectometer to measure very high temperatures with an accuracy of 1%.