Introduction of sensor technology (4), strain sensor of sensor technology

Sensor technology is developing rapidly, and sensor technology is applied in all aspects of life. In previous articles, the editor introduced sensor technologies, such as visual sensor technology, image sensor technology, and multi-sensor fusion technology. In order to further improve everyone’s understanding of sensor technology, this article will introduce the relevant characteristics of strain gauge sensors and the application of strain gauge sensors.

Introduction of sensor technology (4), strain sensor of sensor technology

1. Characteristics of strain sensor

The use of force sensors is very widely used in our industry. Therefore, we must have a certain understanding of the technical parameters and application characteristics of strain gauge sensors. Next, let’s take a look at the technical characteristics of strain gauge sensors. .

(1) Temperature characteristics

1: Allowable use temperature: specifies the applicable range of this sensor. For example, the normal temperature sensor is generally marked as: -20°C to +70°C; the medium temperature sensor is marked as: -40°C to +250°C.

2: Temperature compensation range: This indicates that the sensor has been compensated within this temperature range during production. For example, the normal temperature sensor is generally marked as -10℃–+55℃.

3: Zero temperature influence (commonly known as zero temperature drift): It characterizes the stability of the zero point of the sensor when the ambient temperature changes; generally, the drift generated in the range of 10°C is used as the calculation unit.Its allowable error corresponds to the accuracy class of the sensor

4: The temperature effect of the output sensitivity coefficient (commonly known as coefficient temperature drift): This parameter represents the stability of the output sensitivity of the sensor when the ambient temperature changes

(2) Electrical characteristics

1: Output impedance: The output impedance of the strain gauge sensor has certain specifications: generally: 350 ohms; 700 ohms; 1000 ohms; also 600 ohms

2: Input impedance: Since the input end of the sensor has elastic modulus compensation resistance and coefficient adjustment resistance, the input resistance of the sensor is larger than the output resistance, but it can be changed by connecting metal film resistance in parallel. The input impedance of each sensor is required to be consistent

3: Insulation resistance: This is an important performance parameter of the sensor; the insulation resistance is equivalent to a resistor with a similar resistance in series between the sensor bridge and the ground. Calculating such a circuit network can prove that the size of the insulation resistance will Affect the performance of the sensor. When the insulation resistance is lower than a certain value, the bridge will not work normally.

4: Recommended excitation voltage: generally 10 volts; there are also 3V, 5V, 8V, 9V, etc.

2. Application of strain sensor

The characteristics of sensors include miniaturization, digitization, intelligence, multi-function, systematization, networking, etc. It not only promotes the transformation and upgrading of traditional industries, but also may establish new industries, thus becoming a new economic growth in the 21st century. point. Miniaturization is based on micro-electromechanical systems (MEMS) technology, which has been successfully applied to silicon devices to make silicon pressure sensors. A resistive sensor is a device that converts physical quantities such as displacement, deformation, force, acceleration, humidity, and temperature into resistance values. There are mainly resistance strain sensor, piezoresistive, thermal resistance, thermal, gas sensor, humidity sensor and other resistive sensor devices. A load cell is a power-to-electricity conversion device that can convert gravity into an electrical signal, and is a key component of an Electronic weighing instrument.

The resistance strain sensor has complex structure, variable performance, convenient use, high sensitivity and fast response speed, and is widely used in aviation, machinery, electric power, chemical industry, construction, and other fields. It mainly includes resistance strain sensors, potentiometer sensors, etc. The foil grid in the foil strain gauge is made of metal foil by photolithography, corrosion and other processes. Most of the foil materials are copper-nickel alloys with high resistivity and good thermal stability. The contact area between the foil strain gauge and the sheet base is much larger, the heat dissipation condition is better, the creep during long time measurement is smaller, and the consistency is better, which is suitable for mass production.

The above is the relevant content of “sensor technology” brought by this editor. Through this article, I hope that everyone has a certain understanding of the characteristics of strain sensors and the application of strain sensors. If you like this article, you may wish to continue to pay attention to our website. The editor will bring more exciting content later. Finally, thank you very much for reading, have a nice day!

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