PEOPLE CAN HEAR THE SOUND DUE TO THE OSCILLATION OF THE OBJECT, ITS FREQUENCY IS IN THE RANGE OF 20HZ-20KHZ, BEYOND 20KHZ IS CALLED ULTRASOUND, BELOW 20HZ IS CALLED INFRASOUND. THE COMMONLY USED ULTRASONIC FREQUENCY IS TENS OF KHZ-TENS OF MHZ.
Ultrasonic waves are a type of mechanical oscillation in an elastic medium that oscillates in two ways: transverse (transverse waves) and longitudinal oscillations (longitudinal waves). Longitudinal oscillation is the primary choice for industrial use. Ultrasonic waves can be transmitted in gases, liquids and solids at different speeds. In addition, it also has refractive and reflective phenomena and attenuation in the transmission process. THE FREQUENCY OF ULTRASONIC WAVES TRANSMITTED IN THE AIR IS LOW, GENERALLY TENS OF KHZ, WHILE THE FREQUENCY CAN BE USED HIGHER IN SOLIDS AND LIQUIDS. It decays faster in air, while it is conveyed in liquids and solids, with less attenuation and farther transmission. Using the characteristics of ultrasound, it can be made into a variety of ultrasonic sensors, equipped with different circuits, made into a variety of ultrasonic measuring instruments and devices, and is widely used in communications, medical appliances and other aspects.
There are two main types of ultrasonic sensors: piezoelectric crystals (electroelastic) and nickel-iron-aluminum alloys (magnetoelastic). Electroelastic materials include lead zirconate titanate (PZT) and so on. The ultrasonic sensor composed of piezoelectric crystals is a reversible sensor, which can convert electrical energy into mechanical oscillation and generate ultrasonic waves, and at the same time, when it receives ultrasonic waves, it can also be converted into electrical energy, so it can distribute dividends to transmitters or acceptors. Some ultrasonic sensors can be used for both transmission and reception. HERE WE WILL ONLY INTRODUCE SMALL ULTRASONIC SENSORS, WHICH ARE SLIGHTLY DIFFERENT FROM TRANSMITTING AND RECEIVING, AND THEY ARE SUITABLE FOR TRANSMISSION IN THE AIR, AND THE OPERATING FREQUENCY IS GENERALLY 23-25KHZ AND 40-45KHZ. This type of sensor is suitable for distance measurement, remote control, anti-theft and other purposes. This species has T/R-40-16, T/R-40-12, etc. (among which T indicates transmission, R indicates acceptance, 40 indicates frequency of 40KHZ, and 16 and 12 indicate its outer diameter scale, measured in millimeters). There is also a hermetically sealed ultrasonic sensor (MA40EI type). It is characterized by waterproof effect (but can not be put into water), can be used as a material level and close to the switch, its function is better. There are three basic types of ultrasonic use, the transmissive type is used for remote controls, burglar alarms, automatic doors, proximity switches, etc.; Split reflective type for distance measurement, level or level; The reflective type is used for data flaw detection, thickness measurement, etc.
It is composed of a transmitting sensor (or wave transmitter), an receiving sensor (or wave receiver), a control part and a power supply part. The transmitter sensor is composed of a transmitter and a ceramic oscillator transducer with a diameter of about 15mm, and the transducer is used to convert the electrical oscillation energy of the ceramic oscillator into super energy and radiate it to the air; The receiver sensor is composed of a ceramic oscillator transducer and an amplification circuit, and the receiver wave of the transducer undergoes mechanical oscillation, converts it into electrical energy, and acts as the output of the sensor receiver, so as to detect the ultrasonic signal sent. In practice, the ceramic oscillator used as a transmitting sensor can also be used as a ceramic oscillator for the receiver sensor company. The control part mainly controls the pulse chain frequency, duty cycle, scarcity modulation and counting and exploration interval emitted by the transmitter.
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Banner Sensors - Introduction to the classification of infrared sensors
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The thermal sensor is the use of incident infrared radiation to cause the temperature change of the sensor, and then make the relevant physical parameters change accordingly, by measuring the change of the relevant physical parameters to determine the ...
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Banner Sensors – Routine maintenance methods for pressure sensors
1. Prevent the debris from being deposited in the catheter and the sensor from coming into contact with corrosive or overheated media.
2. When measuring gas pressure, the pressure intake should be opened at the top of the process pipeline, and the sensor should also be installed in the upper part of the process pipeline, so that the accumulated liquid can be easily injected into the process pipeline.
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Banner E-STOP Button – The reason why E-STOP buttons use normally closed contacts
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The time from closed to open of normally closed contact is much shorter than the time of normally open contact from natural state to closed, which is particularly important when emergency stop is required in the event of danger.
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Banner Sensors – An introduction to the application of fiber optic sensors
1. Detection of temperature
The optical fiber temperature sensor uses a polymer temperature-sensitive material that matches the refractive index of the optical fiber to coat the outside of two optical fibers that are fused together, so that the light energy is input from one optical fiber to the reflective surface and output from the other optical fiber.
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Banner Sensors - Classification of Displacement Sensors and Their Introduction
Depending on the mode of exercise
Linear Position Sensor:
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Banner Sensor – How to use the color sensor
Method 1:
Put the color sensor on the white object, turn on the red filter, at this time the sensor will emit the frequency, count the emitted frequency, when the count reaches 255, there is a time, this time is recorded as T1.
Turn on the green filter, at this point the sensor will ...
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Banner Sensors – Causes and solutions for sensors that always alarm
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Features of Banner laser distance sensors
(1) The Ultimate Problem Solver: Solve the most challenging applications by reducing sensor inventory with reliable, durable sensors
(2) Regardless of the reflectivity of the target surface, the solution is difficult distance-based applications, including black foam on black plastic, black rubber in front of metal, multi-packing, etc.
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Banner - Talking about the differences between RTU, ASCII, and TCP in the Modbus protocol
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Banner ABR3000 barcode reader helps to read 2D codes on car window glass
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How to adjust Banner's sensors
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2. Set the range (when stationary)
1. Adjust the sensor with a reflector;
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Banner E-STOP Button - Introduction to the types of E-STOP pushbutton switches
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Banner Sensors – Application Descriptions of Four Laser Sensors
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Banner Sensors - An introduction to the classification of fiber optic sensors
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Banner Sensors – What are the main classifications of displacement sensors?
Depending on the mode of exercise
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Banner Sensor – A calibration method for temperature sensors
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An introduction to the working principle of Banner photoelectric sensors
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Banner Sensors - Introduction to the main classifications and uses of temperature sensors
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Banner Sensor - Introduction to the advantages of fiber optic sensors
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Banner Sensors – Wiring methods for photoelectric switch sensors
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