A few years ago in the field of sensor technology, ultrasonic sensors have always been alternative. Only when other sensing technologies are unable to work, designers will choose ultrasonic technology, which usually occurs in detecting transparent objects, long distance induction, or when the color changes of the target.
The application of new technology enables today's ultrasonic sensors to withstand the test of harsh environments, such as ultrasonic sensors with IP67 and IP69K protection levels, which can be used in a wet environment; a temperature compensation circuit is built in the sensor, when there is a clear temperature change in a normal or changing operating state, from the temperature. The compensation circuit is proofread; the surface of the Teflon type ultrasonic sensor has a special coating that can be used to resist the erosion of harmful chemicals; the advanced filter circuit can allow the ultrasonic sensor to shield the field interference; the new sensor head has a stronger self protection ability, and can resist material damage. We should compare the dirty environment and so on.
Ease of use of ultrasonic sensors
One of the notable features of the new generation of ultrasonic sensors is that it is easier to use, which includes the setting of buttons, DIP switch programming, and the selection of a number of multiple programs.
The switch button is completely embedded in the sensor device, which makes it easy to adjust the distance of the sensor to the distance. It is a simple thing to put the object in front of the sensor and press the button. The sensor can automatically control the size and distance of the window. Easy installation means that the same sensor can adapt to many different applications.
The programming approach of the DIP switch means that a simple sensor can be customized for some special applications, which include response time, output type, switch quantity and analog selection, and special settings for location / level control.
Ultrasonic sensors generally contain a variety of output types in a single sensor, with a two switch output model capable of sensing two different distances with one sensor at the same time, while a sensor with a single switch output and one analog output can be used to measure the alarm output.
These characteristics make ultrasonic sensors more flexible and selective than other sensors.
Basic principles for the use of ultrasonic sensors
The ultrasonic sensor uses the vibration of the vibratory ceramics on the head of the sensor to produce high frequency acoustic waves that can not be heard by the ear. If the sound wave hits an object, the sensor can receive the return wave. The sensor can determine the distance of the object by the wavelength of the acoustic wave and the time difference between the transmitted sound wave and the returned acoustic wave. More representative, a sensor can have two settings of close range and distance through the setting of a button. No matter what the object is in that line, the sensor can detect it. For example, an ultrasonic sensor can be mounted on a liquid tank, or on a box with a small ball, to send a sound wave to the container, and the container is full, empty, or partially full by receiving the return time.
Ultrasonic sensors are also used by independent launchers and receivers. When detecting slow moving objects or applying in a wet environment, this kind of ultrasonic sensor is very applicable. Ultrasonic sensors are the first choice to detect transparent objects and liquids, to detect surfaces of smooth, rough, glossy, translucent materials, and to detect irregular objects. The ultrasonic sensor not applicable: container outdoor, extreme heat, pressure and foam objects.
Selection of ultrasonic sensors
Scope and size
The size of the detected object affects the maximum effective range of the ultrasonic sensor. The sensor must detect a certain level of sound waves to be stimulated to output signals, and a larger object can reflect most of the sound waves to the sensor, so the sensor can be induced to the maximum extent of the sensor. A small object can only reflect very little sound waves, which obviously reduces the range of induction.
The most ideal objects that can be detected by ultrasonic sensors should be large, flat and high-density objects, placed vertically against the sensor's sensing surface. The most difficult to detect are those that are very small, or materials that can absorb acoustic waves, such as foam plastics, or facing the sensors. Some objects that are difficult to detect can first teach the background surface of the object, and then respond to objects placed between the sensor and the background.
When used for liquid measurement, the surface of the liquid needs to be perpendicular to the ultrasonic sensor. If the surface of the liquid is very uneven, the response time of the sensor should be adjusted longer. It will make these changes average and can be read in a fixed way.
The use of ultrasonic sensors in the Retrosonic mode makes it possible to detect irregular objects. In the Retrosonic mode, the ultrasonic sensor can first detect a flat background, such as a wall, when any object passes between the sensor and the wall, the sound wave is hindered, the sensor is induced to interrupt. You will be aware of the appearance of an object.
Whether the sensor itself or the vibration of the surrounding machinery will affect the accuracy of distance measurement. You can take the exam at this time
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