Optical sensor

April 26, 2024

Optical sensor I have a new statement

An optical sensor is a sensor that measures on the basis of optical principles. It has many advantages such as non-contact and non-destructive measurement, almost no interference, high-speed transmission, telemetry, and remote control.

Mainly include optical measuring instruments, laser interferometers, gratings, encoders, optical fiber optical sensors and instruments. It is primarily designed to detect the presence of objects, or to perform various industrial, automotive, electronics, and retail automated motion detection.

1 working principle

The finger is pressed on one side of the glass plane, and an LED light source and a CCD camera are mounted on the other side of the glass. The light beam emitted by the LED illuminates the glass at a certain angle, and the camera is used to receive the light reflected from the glass surface. The ridge line on the finger is in contact with the glass surface, and the valley line is not in contact with the glass surface. Therefore, the light irradiated on the surface of the glass where the fingerprint ridge line contacts is diffusely reflected, and the light irradiated on the glass surface corresponding to the fingerprint valley line is It is totally reflected so that in the image captured by the CCD camera, the portion corresponding to the fingerprint ridgeline is darker, and the portion corresponding to the fingerprint valley line is lighter in color. [1]

2 Features

1, mining low-power architecture [2]

2, can be surface mount technology production

3, automatic adjustment of power saving mode can extend battery life

4, high-speed mobile detection up to 20ips and 8G

5, can automatically adjust the frame read rate to obtain optimal performance

6, mobile detection pin output

7, built-in oscillator circuit, no clock input

8, can choose 500 or 1,000 cpi resolution

9, the working voltage range: 2.7V to 3.6V rated

10, four-wire serial connection port

11, adopt Pb-Free environmental lead-free package and meet RoHS standards

Category 3

Optical sensors include optical image sensors, transmissive optical sensors, optical measurement sensors, optical mouse sensors, and reflective optical sensors.

4 functions

Uses: Optical sensors are widely used in aerospace, aviation, national defense scientific research, information industry, machinery, electricity, energy, transportation, metallurgy, petroleum, construction, telecommunications, biology, medicine, environmental protection and other fields.

Reference materials

1. Fingerprint sensor working principle and methods to improve matching performance Sensor Application Network [Cite Date 2016-03-10] 2. Instrumentation World Net explains the optical sensor for you. Instrumentation World Net [Cite Date 2012-11-06]

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