Trend lead the development of ultrasonic thermometer

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radar pulse time, and the electromagnetic wave transmission speed is constant, can calculate the surface to the radar antenna spacing, so they know on the surface of the liquid level. Radar antenna thermometer emit electromagnetic wave, the wave reflected by the measured object surface, again by the antenna, the electromagnetic wave from transmitting to receiving time is proportional to the interval to the liquid surface.

we generally call for more than 20 KHZ ultrasonic frequency acoustic ultrasound, ultrasound is a kind of mechanical wave, is equal to the mechanical vibration in elastic medium, a kind of communication process, it is characterized by high frequency and wave is small, the diffraction phenomenon, additional directional well, to be ray and directional transmission. Ultrasonic attenuation in liquid and solid is very small, so penetrating ability, especially in light of opaque solid, the length of the ultrasonic wave can penetrate tens of meters, does not have obvious impurity or interface, ultrasonic measurement of material level is the use of the characteristics of it. If principle of ultrasonic wave propagation in the medium, the medium pressure, temperature, density, humidity premise must, the propagation velocity of ultrasonic wave in the medium is a constant. So when measured ultrasonic from launch to meet liquid surface reflection the time required to be received, ultrasonic wave through, can figure out a quick to the data level.

in the ultrasonic testing technology, regardless of the ultrasonic instrument, must transform electricity ultrasonic launch out, can be converted to electrical signals, receive return to finish the function of the device is called ultrasonic transducer, also known as the probe.

ultrasonic using sound waves, radar using electromagnetic waves, this is the biggest difference. And ultrasonic penetrating power and direction are much stronger than the electromagnetic wave, this is why ultrasonic detection of the more popular now.