Introducing new technology to develop new functions of load cells becomes inevitable
Traditionally, load sensor is the general name of load cell and load cell. Generally, we use a single parameter to evaluate its measurement characteristics. This article briefly introduces the principle of load cell and its new technology, and analyzes in detail the principle of resistance strain load cell and its three important components: resistance strain gauge, elastomer and detection circuit.
Introduce new technology and develop new functions
As people deepen their understanding of nature, they will continue to discover new physical effects, chemical effects, and biological effects. These new effects can be used to develop corresponding new sensors, thereby providing new possibilities for improving sensor performance and expanding the range of sensor applications. Yang Deyou, product manager and technical support director of Turck's market technology department, told reporters that "the biggest feature of the sensor industry is the continuous introduction of new technologies and new functions." For example, an inductive proximity switch that detects the position of metal products uses metal objects The eddy current effect formed on the metal to be measured when the oscillation induction head capable of generating an electromagnetic field detects the position of the metal product. Due to the different eddy current effects of different metals, the detection distance of different metals is different, especially when facing various alloys, ordinary inductive proximity switches seem to be inadequate, which requires manufacturers to work hard to improve product functions . Due to the internal structure of the inductive proximity switch, the coil is wound on the ferrite core as the inductance coil, and the limitations of the ferrite core itself make it impossible for the inductive sensor to develop under the existing design concept. Technically develop products that can replace ferrite coils to improve product performance. Turck's inductive proximity switches abandon the ferrite core, thereby removing the limitation of the core. In this way, when detecting different metals, the detection distance of the product can be improved through circuit adjustment, and the detection distance of all metals is not attenuated, and the anti-interference ability is also improved.
He Guangjun, the product manager of the Shanghai Representative Office of Bonner Engineering International Co., Ltd. in the United States, also said that how to use new technologies in products has become the key to breakthroughs for sensor manufacturers. Such as radar sensors, although this technology was developed in the United States, but it has a huge market in China, Banner timely introduced this technology to the Chinese market, and developed the R-Gage QT50R radar sensor. The R-Gage QT50R radar sensor was developed for conditions where optical and ultrasonic sensors cannot function, and can be used to detect fixed objects that cannot be detected by Doppler radar. The detection range can be set easily through the DIP switch, and objects beyond the set distance can be ignored. Manager He Guangjun added, "The characteristics of the 24GHz radar wave determine that it can be used outdoors to detect the presence or absence of large ferromagnetic objects or anti-collision applications for port machinery."
Use new materials to develop new products
Sensor materials are an important foundation for sensor technology. With the advancement of materials science, people can produce a variety of new sensors. For example, the temperature sensor is made of a polymer film, the optical fiber can be made into various sensors such as pressure, flow, temperature, displacement, etc., and the pressure sensor is made of ceramics.
Polymers can adsorb and release water molecules in proportion to the relative humidity of the surrounding environment. The polymer dielectric is made into a capacitor, and the change in capacitance is measured to obtain the relative humidity. The plasma polymerization polystyrene film temperature sensor made by this principle has the characteristics of wide humidity measurement range, wide temperature range, fast response speed, small size, can be used for small space humidity measurement, small temperature coefficient and so on.
Ceramic capacitive pressure sensor is a dry pressure sensor without intermediary liquid. Using advanced ceramic technology and thick film electronic technology, its technical performance is stable, the full-scale error of annual drift does not exceed 0.1%, the temperature drift is small, and the overload resistance can reach hundreds of times of the range.
The application of optical fiber is a major breakthrough in sensing materials. Compared with traditional sensors, optical fiber sensors have many characteristics: high sensitivity, simple structure, small size, corrosion resistance, good electrical insulation, flexible optical path, and easy telemetry. The combination of fiber optic sensor and integrated optical path technology has accelerated the development of fiber optic sensor technology. The integrated optical path device replaces the original optical components and passive optical devices. The fiber optic sensor has the characteristics of high bandwidth, low signal processing voltage, high reliability and low cost.
