What is the principle of pulse sensor?
There are many types of pulse sensors, including pulse sensor, pressure sensor, sound wave sensor, optical sensor, force sensor, and force sensor. This is explained to us one by one by the teacher. The teacher explained the pulse sensor principle to us one by one, and we think that the pulse sensor principle is to give people's pulse to beat. When the teacher came to think that it was a micro-pressure sensor, it tested people's skin, and then tested the signal output of the pulse beat.
The first one to introduce the principle of optical sensors. Fingerprint recognition technology is the most widely used biometric technology today. The collection of fingerprint images is at the forefront of the fingerprint identification system and is one of its key technologies. Based on the analysis and comparison of various fingerprint collection technologies, the performance, structure and working principle of the new generation capacitive fingerprint sensor FPS200 produced by Veridicom of the United States are introduced in detail. The sensor has the advantages of high performance, low power consumption, low price and small size, and has three built-in communication interfaces, which can be easily integrated into various embedded devices. Finally, a set of hardware design scheme and image acquisition program for the fingerprint collector is given, and the key issues in the use and design of the sensor are explained in detail.
The second is the acoustic wave sensor. People can hear the sound due to the vibration of the object. Its frequency is in the range of 20HZ-20KHZ. If it exceeds 20KHZ, it is called ultrasound, and if it is lower than 20HZ, it is called infrasound. Commonly used ultrasonic frequencies are dozens of KHZ-tens of MHZ. Ultrasound is a kind of mechanical oscillation in an elastic medium. There are two forms: transverse oscillation (transverse wave) and longitudinal and oscillation (longitudinal wave). Application in industry mainly uses longitudinal oscillation. Ultrasonic waves can propagate in gases, liquids and solids at different speeds. In addition, it also has refraction and reflection phenomena, and has attenuation during propagation. The frequency of ultrasonic waves propagating in the air is low, generally tens of KHZ, while in solids and liquids, the frequency is higher. The attenuation in air is faster, but in liquid and solid, the attenuation is smaller and the propagation is farther. Using the characteristics of ultrasonic waves, it can be made into various ultrasonic sensors, equipped with different circuits, made into various ultrasonic measuring instruments and devices, and widely used in communication, medical appliances and other aspects.
The third is the load cell. Through the principle of the load cell, the user can clearly understand how the load cell works. At the same time, the force sensor is widely used in winding control equipment and production lines such as printing, compounding, coating, shearing, papermaking, rubber, textile, wire, cable and film, and can be interchanged with similar foreign sensors. The load cell is a bridge circuit composed of one or more elastic bodies that can deform after being stressed, and resistance strain gauges that can sense this deformation amount, and can fix and paste the resistance strain gauges on the elastic body and can The three parts of the adhesive that conducts the strain variable and the sealant that protects the electronic circuit make up the load cell. The measuring principle of the load cell.
If you want to know more, our website has product specifications for pulse sensor, you can go to ALLICDATA ELECTRONICS LIMITED to get more information