What are the advantages and disadvantages of ultrasonic sensors?

Ultrasonic sensors are widely used in manufacturing, electric power, and metallurgy to measure building materials, chemicals, food, automobiles, warehousing, ships, textiles, transportation, prospecting, liquid level, due to their high measurement accuracy, stable operation, and temperature compensation. In industries such as level monitoring, open channel flow detection, and robotics food processing, it can measure liquid materials as well as liquid level measurement in the solid material industry.

First of all, let's talk about the working principle of ultrasonic module distance measuring sensor: ultrasonic sensors are developed by using the characteristics of ultrasonic waves. Ultrasonic probes are mainly composed of piezoelectric chips, which can transmit and receive ultrasonic waves. The piezoelectric ultrasonic generator actually uses the resonance of a piezoelectric crystal to work. It has two piezoelectric wafers and a resonance plate. When the frequency of the pulse signal is equal to the natural oscillation frequency of the piezoelectric wafer, the piezoelectric wafer will resonate and drive the resonance plate to vibrate to generate ultrasonic waves. On the contrary, if no voltage is applied between the two electrodes, when the resonance plate receives ultrasonic waves, it will press the piezoelectric chip to vibrate and convert the mechanical energy into electrical signals, and then it becomes an ultrasonic receiver. Low-power ultrasonic probes are mostly used for detection. They have many different structures. They can be divided into straight probes (longitudinal waves), oblique probes (transverse waves), surface probes (surface waves), Lamb wave probes (Lamb wave), and double probes ( One probe receiving, one probe receiving).

Secondly, there are many advantages of using ultrasonic distance sensor characteristics to measure objects. That is because ultrasonic waves have the characteristics of high frequency, short wavelength, small diffraction phenomenon, especially good directionality, and can become rays and propagate directionally. Ultrasound has a great ability to penetrate liquids and solids, especially in solids that are opaque to sunlight. It can penetrate to a depth of tens of meters. When the ultrasonic wave hits the impurity or the interface, it will produce a significant reflection to form an echo, and it can produce a doppler effect when it hits a moving object. Ultrasonic sensors developed based on ultrasonic characteristics are called "ultrasonic sensors" and are widely used in the national defense and biomedicine industry.

However, because the curie point of piezoelectric materials is generally relatively high, especially the ultrasonic sensor used in diagnostic ultrasonic probes has low power and low operating temperature, and can work for a long time without failure. The temperature of medical ultrasound probes is relatively high and requires separate refrigeration equipment. The sensitivity mainly depends on the manufacturing wafer itself. The electromechanical coupling coefficient is large and the sensitivity is high; on the contrary, the sensitivity is low. There are three reasons:

1. The frequency of current ultrasonic sensors is relatively fixed. For example, 40KHz sensors can only be used at 38-42KHz, and other frequencies are similar. At present, there are almost no sensors with a wide frequency range, such as 40KHz~500KHz. 

2. The driving voltage is relatively high, generally between 100Vp-p and 1500Vpp. In many low-voltage equipment, pulse transformers are required to boost the voltage, but it will also bring some complicated problems. It would be better if there are 3~5V low voltage drive (higher power) sensors;

3. The sensitivity should be higher:

It can be seen that the industrial ultrasonic level sensor can emit, receive and analyze the sound that our human ears cannot detect. In terms of detection, the use of ultrasonic sensors can achieve ultrasonic ranging, ultrasonic flaw detection and other functions, which can be used to detect submarine sunken ships, enemy submarines and display metal internal injuries. These can be applied to various technical fields such as industry, agriculture, light industry, and medical treatment, and are closely related to our lives. As for the analysis of some advantages and disadvantages of ultrasonic sensors. If you are still very interested in the advantages and disadvantages of ultrasonic sensors, you may as well use the ultrasonic sensors yourself. Learn the advantages and disadvantages of ultrasonic sensors within a period of time. If you find out how to solve the shortcomings of ultrasonic sensors during the process of using ultrasonic sensors, you can also consult the professional researchers of related ultrasonic sensors on the website.