Discussion on High Sensitivity NTC Temperature Sensor for Temperature Measurement on the Surface of Pipe Body.Pyroelectric infrared sensor lens

　　Thermistor components and NTC temperature sensors, composed of NTC thermistor chips as core electronic components and packaged in different forms, are widely used in various temperature detection, compensation, and control circuits. It plays a core role in converting temperature variables into the required electronic signals in the circuit.

　　With the development of electronic technology, various electronic devices have become more multifunctional and intelligent. NTC thermal chips are gradually increasing in various applications that require temperature detection, control, compensation, etc. At the same time, higher requirements are put forward for the structure of temperature sensors. In order to achieve high-precision, high sensitivity, high reliability, and fast detection, the structure design of temperature sensors must comply with the structural requirements of the tested object.

　　However, existing tube temperature sensors generally come into contact with the convex surface of their shrapnel and the arc-shaped surface of the tube, resulting in a relatively small contact area between the two. The heat transfer causes the heat to be very slow, resulting in a slower temperature sensing speed of the temperature sensor. The transfer of temperature from the tube to the core thermosensitive chip inside the temperature sensor takes a longer time, and the thermal time constant is generally 10-20 seconds, This reaction speed cannot meet the high sensitivity requirements for temperature detection and may result in inaccurate temperature measurement.

　　In addition, the existing shell structure of the tube temperature sensor can only adapt to single size pipeline temperature measurement, and cannot be used for various sizes of pipelines. Its universality is poor, and it needs to be customized for specific pipelines, and its installation is complex and inconvenient to operate.

　　Based on this, a universal tube surface temperature sensor is provided, which has the advantages of convenient use, strong universality, fast response speed, sensitive detection, and high mechanical strength.

　　The sensor utilizes a conventional structure clamp and shrapnel as the casing, and places at least one NTC thermistor in the cavity between the clamp and the shrapnel; By setting adjustable clamps, temperature sensors can be clamped outside various pipe sizes, making operation convenient, fast, and versatile; And when the shrapnel compresses the tested tube body, it can undergo deformation to fit with the outer wall surface of the tested tube. At the same time, the tension of the spring in the clamp makes the shrapnel closely fit with the outer wall surface of the tested tube body and has a large contact area, achieving full contact. Therefore, the thermistor in contact with the shrapnel can quickly receive the temperature transmitted from the fluid inside the tested tube body, and its response speed is very fast, which can achieve highly sensitive detection, The thermal time constant of a highly sensitive temperature sensor is 2-3 seconds, which is only one-fifth of that of existing sensors, and its thermal conductivity rate is much higher than that of existing temperature sensors; In addition, clips and shrapnel can protect the thermistor, so the temperature sensor has high mechanical strength.

　　The production method of a universal tube surface temperature sensor for temperature measurement is as follows:

　　(1) Make two clips 10 and spring 11 respectively, and then assemble them into clip 1 using shaft 13, and make spring 2;

　　(2) Glue at least one thermistor 3 with packaging material 4 and encapsulate it on the clip 2. At the same time, connect one end of the electronic wire 5 to the thermistor 3, and use an insulating sleeve 50 to insulate and protect the connection between the electronic wire 5 and the thermistor 3. Then, connect the other end of the electronic wire 5 to the connector 6 through the small hole opened on the clip 10;

　　(3) Connect the shrapnel 2 bonded with the thermistor 3 to the clip 10, so that the thermistor 3 is placed in the cavity formed between the shrapnel 2 and the clip 10;

　　(4) Cure and solidify the packaging material 4 in the packaged temperature sensor to complete the production;

　　(5) Perform resistance and insulation withstand voltage tests on the prepared temperature sensor.

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