The load cell is a force-to-electrical conversion device that converts gravity into an electrical signal and is a key component of the electronic scale.
There are many kinds of sensors that can realize force→electrical conversion, and common ones are resistance strain type, electromagnetic force type and capacitive type. The electromagnetic force type is mainly used for electronic balances, and the capacitive type is used for some electronic crane scales, and most of the scale products use resistance strain gauge load cells. The resistance strain gauge load cell has a simple structure, high accuracy, wide application range, and can be used in a relatively poor environment. Therefore, the resistance strain type load cell is widely used in the scale.
Piezoresistive sensors are devices that are fabricated by diffusion resistance on a substrate of a semiconductor material in accordance with the piezoresistive effect of the semiconductor material. The substrate can be directly used as a measuring sensor element, and the diffusion resistor is connected in the form of a bridge in the substrate. When the substrate is deformed by an external force, the resistance values will change, and the bridge will produce a corresponding unbalanced output.
The substrate (or diaphragm) used as a piezoresistive sensor is mainly a silicon wafer and a silicon wafer, and the silicon piezoresistive sensor made of a sensitive material is more and more popular, especially in measuring pressure. And speed solid state piezoresistive sensors are most commonly used.
Biosensors are an interdisciplinary combination of bioactive materials (enzymes, proteins, DNA, antibodies, antigens, biofilms, etc.) and physicochemical transducers. They are an advanced detection method essential for the development of biotechnology. And monitoring methods are also rapid, micro-analytical methods for the molecular level of matter. Various biosensors have the following common structures: one or several related bioactive materials (biofilms) and physical or chemical transducers (sensors) capable of converting biologically active signals into electrical signals, a combination of the two Together, modern microelectronics and automated instrumentation technology are used to reprocess biosignals to form a variety of biosensor analysis devices, instruments, and systems that can be used.