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technical article
Explanation of Ultrasonic Principle
2011-12-12 10:44:39


的特点 Characteristics of ultrasound

When installing the instrument, pay attention: the highest material level must not enter the measurement blind zone, the instrument must be kept a certain distance from the tank wall, and the installation of the instrument should make the emission direction of the transducer perpendicular to the liquid level as much as possible

Complicated working conditions; the built-in temperature sensor of the transducer can achieve temperature compensation of measured values;

换能器采用最佳声学匹配之专利技术、使其发射功率能更有效地辐射出去、提高信号强度、从而实现准确测量! The ultrasonic transducer adopts the patented technology of the best acoustic matching, so that its transmission power can be radiated more effectively, the signal strength is increased, and accurate measurement is achieved!

安装要求 Ultrasonic installation requirements

It is important to note that the ultrasonic beam must not intersect the feed stream. When the transducer emits ultrasonic pulses, it has a certain emission opening angle. From the lower edge of the transducer to the surface of the measured medium, in the area radiated by the emitted ultrasonic beam,

There must be no obstacles, so installations should be avoided as far as possible, such as: people ladders, limit switches, heating equipment, brackets, etc.

Measurement principle


Because the transmitted ultrasonic pulse has a certain width, the reflected wave and the transmitted wave in a small area close to the transducer overlap and cannot be identified, and the distance value cannot be measured. This area is called the measurement dead zone.

The size of the dead zone depends on the model of the ultrasonic level gauge

物位计的工作原理是由换能器(探头)发出高频超声波脉冲遇到被测介质表面被反射回来,部分反射回波被同一换能器接收,转换成电信号。 The working principle of the ultrasonic level meter is that the transducer (probe) sends out high-frequency ultrasonic pulses and is reflected back on the surface of the measured medium. Part of the reflected echo is received by the same transducer and converted into electrical signals. Ultrasonic pulses travel at the speed of sound waves.

The time interval required to shoot the ultrasonic pulse is proportional to the distance from the transducer to the surface of the measured medium. The relationship between this distance value S and the speed of sound C and the transmission time T can be expressed by the formula: S = CxT / 2.