A load sensor (often more commonly referred to as a "load sensor") is an electronic device that converts tension and compressive force into corresponding electrical signals. Load sensors are commonly used to determine the weight of an object (e.g., in household or industrial scales), but can also be used to quantify tension (e.g., in pulleys, cables, and ropes).
Although load sensors differ in design and function, they all measure resistance and/or deformation within the sensor to determine the magnitude of tensile and compressive forces. The manufacturing, medical, grocery, and automotive industries all benefit from load sensor technology.
The two simplest load sensor designs are hydraulic load sensors and pneumatic load sensors. Hydraulic sensors use liquids, while pneumatic sensors use gases. When tension or compression is applied, the liquid or gas expands or contracts, generating an electrical signal proportional to the applied force. These sensors are typically connected directly to a pressure gauge; they are examples of pressure sensors.
The most common type of load sensor is the strain gauge load sensor. A strain gauge consists of a flexible diaphragm and a wire. When this load sensor is subjected to compression or tension, the resistance within the strain gauge decreases or increases proportionally. Strain gauge load sensors are typically arranged in a Wheatstone bridge configuration (used to calculate an unknown resistance using three known resistors).
A schematic diagram of a Wheatstone bridge load cell.
Capacitive load sensors are considered the most accurate type of load sensor. They measure capacitance (the sensor's ability to store electrical charge) to quantify compressive force. A capacitive load sensor consists of two conductive plates that move closer to or further apart as the load changes. The capacitance changes with the distance between the plates, and this change in capacitance is detected by a measuring circuit.
In addition, there are piezoelectric load sensors (which utilize the piezoelectric effect) and beam load sensors (which generate electrical signals when bent).
Disclaimer: This article is a reprint. If it involves copyright issues, please contact us promptly for deletion (QQ: 2737591964). We apologize for any inconvenience.
