The technology of torque sensor has become more and more mature. But in fact its development has gone through three stages.

The first stage is the generation of measurement technology. In 1678, Robert Hooke described Hooke's law of proportionality between material elongation and associated material tension. Moreover, the advent of bridge circuits enables small changes in voltage to be measured.

The second stage is the birth of rotary torque sensor. In 1945, rotary torque sensor was introduced on the market. If the axial torque of the loaded shaft is twisted by an angle, the torque will change proportionally. The Angle of this twist can be measured using a measuring system.

The third stage is the birth of modern torque sensor. Modern torque sensors typically have analog outputs, and in these interfaces, adjacent drivers may interfere. Then the emergence of digital electronic sensors enhanced the anti-interference ability.

So far, torque sensor with more variety and performance is developing rapidly. The test system from static testing to dynamic online detection also develops toward miniaturization, digitalization, intelligence, virtualization and network direction.