Analysis of the Characteristics of Eight Kinds of Sensors Widely Used

Sensors are like the “five senses” of equipment. They are the “necessary” devices for the communication between human and machine. Sensors are generally composed of four parts: sensitive components, conversion components, conversion circuit and auxiliary power supply. With the development of information technology, the application of sensors is more extensive, and a variety of sensors have become the focus of enterprise research.

1. Wireless sensor

With the development of the Internet of things, WIFI and other wireless connectivity is very popular, which gives wireless sensor development a very important opportunity, the prospect is unlimited.Combination module of wireless sensor encapsulated inside a shell, it will be at work by batteries or vibration generators to provide power supply, a wireless sensor network node, the random distribution of integrated with sensors, data processing unit and communication module of tiny nodes, by way of self-organization constitutes a network, wireless sensors can be used in many areas need a wireless connection and data tracking.

2. Photosensitive sensor

There are many types of photosensitive sensors, including infrared sensors, ultraviolet sensors, CCD and CMOS image sensors, etc., which play a very important role in automatic control and non-electric measurement technology. It is a sensor that USES photosensitive elements to convert optical signals into electrical signals.Photosensitive sensors are mainly used in the field of automatic control of solar lawn lights, cameras, monitors, sound-light switches, cameras and other electronic products.

3. Biosensors

It is a sensitive to biomass and its concentration is converted to electrical signals for testing instruments, by immobilized biological sensitive materials as recognition element and signal amplification device consisting of analysis tool or system, it has the following common structures, including one or several related bioactive materials and are able to express biologically active physical or chemical transducer signal is converted to electrical signals.Biosensors are widely used in many fields due to their characteristics of good selectivity, high sensitivity, low cost, high automation, miniaturization and integration.

4. Electromagnetic sensor

It is a kind of sensor that converts the measured physical quantity into the induced electromotive force. It is mainly a power-generating sensor designed for the speed measuring gear. The magnetic flux change induced in the conductor measured will be converted into the change of output signal.In addition to high sensitivity and large output signal, this kind of sensor has a very strong speed detection range, and it plays a very important role in industrial applications.

5. Temperature sensor

It is a sensor that can feel the temperature and convert it into usable output signal. The temperature sensor is the core part of the temperature measuring instrument, which can be divided into two categories of contact type and non-contact type according to the measurement method. According to the characteristics of sensor materials and electronic components, it can be divided into two categories of thermal resistance and thermocouple.Temperature sensor is widely used in color TV, switching power supply, water heater, refrigerator, air conditioner, automobile and other fields.

6. Laser sensor

It is the sensor that USES laser technology to carry on a survey, by laser, laser detector and survey circuit are comprised, advantage is to leave survey, speed is fast, accuracy is high, range is big, kang interference ability is strong etc.The laser sensor is applied in the over-limit detection of vehicle width and height. The laser sensor is used for rapid measurement, and the network kernel of PC ipc and visual programming software VB is used for real-time data transmission and processing with the sensor. The system has good real-time performance, high measurement accuracy and strong practical value.

7. Visual sensor

It is a direct source of information for the entire machine vision system, consisting mainly of one or two graphics sensors, sometimes with optical projectors and other auxiliary equipment.Vision sensors have thousands of pixels that capture light from an entire image, and the clarity and fineness of the image is usually measured in terms of resolution, expressed in pixels.Industrial applications of vision sensors include inspection, metrology, measurement, orientation, defect detection and sorting.

8. Smart sensor

It is a sensor with information processing function, intelligent sensor with microprocessor, has the ability to collect, process, exchange information, is the product of sensor integration and microprocessor, its low cost, programming automation ability, function diversification.Intelligent sensors have been widely used in aerospace, aviation, national defense, industrial and agricultural production and other fields.

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