Speed ​​sensor concept

The electronic tachometer is a more general concept: based on modern electronic technology, the rotational speed measurement tool is designed and manufactured. It usually has sensors and displays, and there are signal outputs and controls. Because of the variety of sensors and display devices, as well as the diversity of measurement methods, it is difficult to classify them as the first five. Here, electronic tachometers are classified separately from sensors and secondary instruments. If you choose from the installation and use methods, there are local installation, desktop, cabinet-mounted and portable and handheld. The notice on the role of industry websites and the promotion of industry information work.

Speed ​​sensor from the principle (or device) to points, there are magnetic induction, photoelectric effect, Hall effect, magnetoresistive effect, dielectric electromagnetic induction and so on. There are also rotational speed sensors that indirectly measure the speed: such as the acceleration sensor (through integral calculation, indirect derivation of the speed), the displacement sensor through differential operation, indirect derivation of speed, and so on. Speed-measuring generators and certain magnetoelectric sensors in the linear region can be directly exchanged with AC RMS rotating speed meters to measure the speed; most of them output pulse signals (approximate sine wave or rectangular wave). Speed ​​measurement methods for pulse signals include: frequency integration (F/V conversion method, whose direct result is voltage or current), and frequency calculation (its direct result is digital).