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Introduction to ultrasonic level sensor

Views:2     Author:Site Editor     Publish Time: 2019-03-30      Origin:Site


Ultrasonic level sensor combines three functions of non-contact switch, controller and transmitter. It is suitable for small storage tanks. The flexible design of ultrasonic liquid level sensor can be applied to integrated systems or replace floating ball switches and conductivity switches. Pressure sensor is also suitable for the comprehensive application of fluid control and chemical feeding system. Ultrasonic liquid level sensor is also a good choice for small tanks of machines, brakes and other equipment. ultrasonic sensor for water flowmeter can be applied to mud and corrosion. Ultrasonic level sensor is widely used in various atmospheric storage tanks, process tanks, small tanks and small containers, pump lifting stations, wastewater storage tanks, etc.


Ultrasonic liquid level sensor principle


The ultrasonic transducers sensor is a sensor that is developed using the characteristics of ultrasonic waves. Ultrasonic wave is a kind of mechanical wave whose vibration frequency is higher than sound wave. It is generated by the vibration of the transducer wafer under the excitation of voltage. It has high frequency, short wavelength, small diffraction phenomenon, especially good directionality, and can be oriented as a ray. Characteristics such as communication. Ultrasonic penetration of liquids and solids is very large, especially in sunlight opaque solids, which can penetrate depths of several tens of meters. When an ultrasonic wave hits an impurity or an interface, it will produce a significant reflection to form a reflection into an echo, which can produce a Doppler effect when it hits a moving object. Therefore, ultrasonic testing is widely used in industrial, national defense, biomedical and other fields. Ultrasound is used as a detection means, and ultrasonic waves and ultrasonic waves must be generated. The device that performs this function is an ultrasonic sensor, which is customarily called an ultrasonic transducer, or an ultrasonic probe. The ultrasonic depth transducer is mainly composed of a piezoelectric wafer, which can emit ultrasonic waves as well as ultrasonic waves. Small power ultrasound probes are used for detection. It has many different structures, which can be divided into straight probe (longitudinal wave), oblique probe (transverse wave), surface wave probe (surface wave), Lamb wave probe (Lamp wave), dual probe (one probe reflection, one probe reception) Wait. The heart of the ultrasonic sensor is a piezoelectric wafer in its plastic jacket or metal jacket. There are many kinds of materials constituting the wafer. The size of the wafer, such as diameter and thickness, is also different, so the performance of each sensor is different, we must know its performance before use.


Main performance indicators of ultrasonic sensors:


(1) Working frequency. The operating frequency of ultrasonic sensor water flow meter is the resonant frequency of the piezoelectric wafer. When the frequency of the alternating voltage applied to both ends thereof is equal to the resonant frequency of the wafer, the output energy is the largest and the sensitivity is also the highest.
(2) Working temperature. Since the curie point of the piezoelectric material is generally high, in particular, the diagnostic ultrasonic probe uses less power, so the operating temperature is relatively low, and it can work for a long time without causing failure. Medical ultrasonic sensors are relatively hot and require separate refrigeration equipment.
(3) Sensitivity. It mainly depends on the manufacture of the wafer itself. The electromechanical coupling coefficient is large and the sensitivity is high; on the contrary, the sensitivity is low. Like an ultrasonic sensor, a composite vibrator is flexibly to the base. The composite vibrator is a resonator and a combination of a bimorph element vibrator composed of a metal piece and a piezoelectric ceramic. The resonator has a flare shape for efficiently radiating ultrasonic waves generated by vibration, and can effectively concentrate the ultrasonic waves at a central portion of the vibrator.

Ultrasonic flow meter transducer must have good sealing to prevent ingress of dew, rain and dust. The piezoelectric ceramic is fixed on the inner side of the top of the metal case. The base is fixed to the open end of the case and covered with a resin. For ultrasonic sensors used in industrial robots, accuracy is required to be 1 mm and strong ultrasonic radiation is required. The ultrasonic level sensor also has the following characteristics, the ultrasonic level sensor has a measuring range of 1.25 meters, and the ultrasonic level sensor DL10 outputs 4 to 20 meters.


Ultrasonic liquid level sensor is a commonly used measuring instrument and is widely used in many industries. The ultrasonic transducer strap on flowmeter is a sensor developed using the characteristics of ultrasonic waves. It has the advantages of accurate measurement, wide detection range, flexible use and easy maintenance. The structure of the ultrasonic liquid level sensor, the ultrasonic sensor is mainly composed of a piezoelectric wafer, and can emit ultrasonic waves as well as ultrasonic waves. Small power ultrasound probes are used for detection. It has many different configurations, which can be divided into straight probe (longitudinal wave), oblique probe (transverse wave), surface wave probe (surface wave), lamb wave probe (Lamp wave), dual probe (one probe reflection, one probe reception) )Wait. The heart of the ultrasonic sensor is a piezoelectric wafer in its plastic jacket or metal sheath. There are many kinds of materials constituting the wafer. The size of the wafer, such as diameter and thickness, it is also different, so the performance of each sensor is different, we must know its performance.


How the ultrasonic level sensor works
Ultrasonic wave is a kind of mechanical wave whose vibration frequency is higher than sound wave. It is generated by the vibration of the transducer wafer under the excitation of voltage. It has high frequency, short wavelength, small diffraction phenomenon, especially good directionality, and can become radiation. Directional propagation and other characteristics. Ultrasonic penetration of liquids and solids is very large, especially in sunlight opaque solids, which can penetrate depths of several tens of meters. When an ultrasonic wave hits an impurity or an interface, it will produce a significant reflection to form a reflection into an echo, which can produce a doppler effect when it hits a moving object. Therefore, ultrasonic testing is widely used in industrial, national defense, biomedical and other fields. Ultrasound is used as a detection means, and ultrasonic waves and ultrasonic waves must be generated. The device that performs this function is an ultrasonic sensor, which is customarily called an ultrasonic transducer, or an ultrasonic probe.


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