LOGO

transducer (English name: transducer/sensor) is a detection device that can feel the information being measured, and can transform the felt information into an
electrical signal or other required form of information output according to a certain law to meet the requirements of information transmission, processing,
storage, display, recording and control.

The existence and development of sensors, so that the object has the sense of touch, taste and smell, so that the object becomes alive, the sensor is the
extension of human features.

The sensor has the characteristics of miniaturization, digitalization, intelligence, multi-function, systematization, networking, etc. It is the primary
link to realize automatic detection and automatic control.

The new aluminum nitride sensor can operate at high temperatures up to 900 ° C.

Feature

Light sensor - Vision

Acoustic sensors - Hearing

Gas sensor - Smell

Chemical sensor - Taste

Pressure sensitive, temperature sensitive, fluid sensor - touch

Classification of sensitive elements:

Physics, based on physical effects such as force, heat, light, electricity, magnetism and sound.

Chemistry, based on the principles of chemical reactions.

Biological, based on molecular recognition functions such as enzymes, antibodies, and hormones.

Generally, according to its basic sensing function, it can be divided into ten categories such as thermal elements, photosensitive elements, gas sensitive
elements, force sensitive elements, magnetic sensitive elements, humidity sensitive elements, acoustic sensitive elements, radiation sensitive elements,
color sensitive elements and taste sensitive elements

sort

By purpose

Pressure and force sensors, position sensors, liquid level sensors, energy consumption sensors, speed sensors, acceleration sensors,
radiation sensors, thermal sensors.

In principle

Vibration sensor, humidity sensor, magnetic sensor, gas sensor, vacuum sensor, biological sensor, etc.

Per output

Analog sensor: Converts the measured non-electrical quantity into an analog electrical signal.

Digital sensor: Converts the measured non-electrical quantity into a digital output signal (including direct and indirect conversion).

Pseudo digital sensor: The output of the measured semaphore into a frequency signal or a short-period signal (including direct or indirect conversion).

Switch sensor: When a measured signal reaches a certain threshold, the sensor outputs a set low or high level signal accordingly.

According to its manufacturing process

Integrated sensors are manufactured using standard process techniques for the production of silicon-based semiconductor integrated circuits.
Typically, part of the circuit used for the initial processing of the signal under test is also integrated on the same chip.

Thin film sensors are formed by depositing a thin film of the corresponding sensitive material on a dielectric substrate (substrate). When the hybrid
process is used, part of the circuit can also be manufactured on this substrate.

The thick film sensor is made of a slurry of the corresponding material coated on a ceramic substrate, which is usually made of Al2O3, and then
heat treated to form the thick film.

Ceramic sensors are produced by standard ceramic processes or some variant of them (sol, gel, etc.).

After the appropriate preparatory operation is completed, the formed components are sintered at high temperatures. There are many common
characteristics between the two processes of thick film and ceramic sensor, and in some respects, the thick film process can be considered as a
variant of the ceramic process.

Each process technology has its own advantages and disadvantages. Due to the low capital investment required for research, development
and production, as well as the high stability of sensor parameters, the use of ceramic and thick film sensors is more reasonable.

By measurement

Physical sensors are made using the properties of certain physical properties of the substance being measured to change significantly.

Chemical sensors are made of sensitive elements that can convert chemical quantities such as composition and concentration of
chemical substances into electrical quantities.

Biosensors are sensors that use the characteristics of various organisms or biological substances to detect and identify chemical components
in organisms.

In its composition

Basic sensor: It is the most basic single conversion device.

Combined sensor: It is a sensor composed of different individual conversion devices.

Application sensor: It is a sensor composed of a basic sensor or a combined sensor and other mechanisms.

In action form

According to the form of action can be divided into active and passive sensors.

The active sensor has an action type and a reaction type, which can emit a certain detection signal to the tested object, and can detect the change
of the detection signal in the tested object, or the signal is formed by the detection signal in the tested object. The mode of detecting the change of the
detection signal is called the action type, and the mode of detecting the response and forming the signal is called the reaction type. Radar and
radio frequency range detectors are examples of action, while photoacoustic effect analysis devices and laser analyzers are examples of reaction.

Passive sensors only receive signals generated by the measured object itself, such as infrared radiation thermometers and infrared camera devices.