In the rapid development of modern technology, sensors play a crucial role as the "tentacles" of the information age. Among them, force sensitive sensors, as a device capable of converting physical forces into electrical signals, are widely used in various fields such as industrial automation, medical equipment, and robotics. This article will delve into the definition, working principle, application areas, selection and calibration methods of force sensitive sensors, leading readers to explore the mysteries of this technological product.

1、 Definition of force sensitive sensor

A force sensitive sensor, also known as a pressure sensor or load sensor, is a device that can measure the magnitude of pressure or tension on an object and convert these forces into electrical signals for output. This conversion enables physical quantities (i.e. force or pressure) to be recorded, controlled, or analyzed, thereby achieving precise monitoring and control of objects.

2、 Working principle of force sensitive sensor

The working principle of force sensitive sensors is mainly based on the piezoresistive effect, strain gauge effect, or piezoelectric effect. Among them, piezoresistive effect and strain gauge effect are two common principles.

Piezoresistive effect: Some materials experience a change in their resistance when subjected to external forces. The force sensitive sensor uses this principle to calculate the magnitude of the force applied by measuring the change in resistance value.

Strain gauge effect: When an object is subjected to external forces, it undergoes deformation, which causes a change in the resistance value of the strain gauges attached to the surface of the object. A force sensitive sensor senses changes in external force by measuring the resistance value of strain gauges.

Piezoelectric effect: Some materials will experience a potential shift when subjected to external forces, resulting in the generation of charges. Force sensitive sensors use components made of piezoelectric materials to sense changes in external force by measuring changes in the amount of charge.

3、 Application fields of force sensitive sensors

The application fields of force sensitive sensors are wide, including but not limited to the following aspects:

Industrial automation: In the production line, force sensitive sensors can be used to measure the cutting force of machine tools, the dynamic performance of machine tools, etc., to ensure the stability and safety of the production process.

Medical equipment: In medical equipment, force sensors can be used to measure the pressure distribution and changes in various parts of the human body, providing a basis for the diagnosis and treatment of diseases. For example, in the intelligent mattress monitoring system, force sensors can sense the posture and weight distribution of the human body in real time, providing support for health monitoring and rehabilitation.

Robotics technology: In robot arms, force sensitive sensors can help robots more accurately perceive and grasp objects, achieving precise operations.

Automotive industry: Force sensitive sensors can be used to measure brake pedal pressure, vehicle weight, and axle load, ensuring the safety and stability of automobiles.

4、 Selection and Calibration of Force Sensitive Sensors

When selecting force sensitive sensors, the following factors need to be considered:

Measurement range and accuracy: Choose the appropriate measurement range and accuracy according to actual needs. For example, if measuring small changes in force, a high-sensitivity sensor needs to be selected.

Work environment: Consider the working environment of sensors, including temperature, humidity, corrosiveness, and other factors, and choose sensors with strong adaptability and good stability.

Cost and cost-effectiveness: Choose products with higher cost-effectiveness while meeting measurement accuracy and range requirements.

In addition, to ensure the accuracy and stability of the force sensitive sensor, it is necessary to calibrate it regularly. The calibration process includes setting standard values, applying standard forces and recording measurement results, calculating error values and drawing error curves. If the error exceeds the allowable range, correction work is required.

5、 Conclusion

As an important component of modern technology, force sensitive sensors have brought great convenience to our lives and work with their unique sensing capabilities and wide application fields. By delving into the definition, working principle, application areas, and selection and calibration methods of force sensitive sensors, we can better utilize this technological product and promote technological progress and development. In the future, with the continuous development of materials science, electronic technology, and information technology, force sensitive sensors will have broader application prospects and more accurate performance.

Source: Sensor Expert Network