Tension/compression sensors, also known as strain gauge controllers, can accurately convert mechanical stress into a measurable electrical signal output. They play a vital role in many areas of manufacturing, particularly in weighing systems, electronic scales, and crane scales. This is because tension/compression sensors are favored for their high accuracy, long lifespan, and simple structural design.
A thorough understanding of the operating mechanism of tension and compression sensors is crucial. Several key performance indicators deserve close attention during sensor operation. First, sensitivity directly reflects the sensor's responsiveness to input changes; linearity describes the ideal linear relationship between the sensor's input and output; hysteresis refers to the misalignment of the forward and reverse characteristic curves due to the sensor's internal structure during input changes; repeatability focuses on the stability of multiple measurements under the same input conditions; and drift refers to the random changes in output over time when there are no input changes.
The working principle of a tension/compression sensor is based on the precise detection of force changes by a force-sensitive device, and the accurate conversion of the force signal into an electrical signal through a specific transmission structure. Specifically, when an elastic body undergoes elastic deformation under the action of an external force, this deformation is rapidly transmitted to a resistance strain gauge, resulting in a subtle change in the resistance value. This change is further converted into a measurable electrical signal output, realizing the measurement and transmission of force.
Taking a digital display electronic scale as an example, its internal circuit design is ingenious and sophisticated, comprising two core components: a measurement circuit and a signal amplification circuit. The measurement circuit is responsible for accurately converting changes in resistance into a voltage signal, which, while important, is usually quite weak and difficult to display directly. To solve this problem, a signal amplification circuit is cleverly introduced. It efficiently amplifies this weak signal, enabling the digital display panel to present the measurement results clearly and intuitively.
