How to overcome the ultrasonic thermometer blind spots

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like people's eyes, blind area when the object is near the eyes is very close, but can't see clearly, this distance is called the blind area, ultrasonic thermometer is a blind area.

ultrasonic the blind spot of the thermometer, according to different range, the blind area is also different. Small range, the blind area, range is big, the blind area. On special occasions, will ask blind area is small, this time can consider small blind spot ultrasonic thermometer, its only 4 - blind area in general 6cm。 But its range is very small, only 0. 6m。 In the field of many level measurement, because of the limitation of space, constraint of installation and need blind area small ultrasonic thermometer.

the highest level must not enter the measurement/area; Instrument from the tank wall must keep a certain distance; The installation of instrument as far as possible the launch of the transducer and liquid surface vertical direction. Installation of instrument must abide by the countries in the area of the explosion-proof explosion-proof of danger of installation, can be installed in places that have requirements of explosion-proof requirements, instrument must pick up the earth.

(1) ultrasonic thermometer can spread in a variety of patterns, Longitudinal wave and transverse wave, surface wave, etc. ) In gas, liquid and solid, can also be in the light can travel through the metal, biological, is an effective method for detecting material inside.

2. When the sound wave propagation direction with acoustic frequency stronger, with the rising of the launch of the beam are more acute. Ultrasound can approximate to linear transmission, has the very good directivity.

3. When sound waves transmitted by a medium to another medium, because of two different kinds of medium density and sound wave in the transmission speed is different, sound waves will produce reflection and refraction on the boundary, the sound waves straight incidence, if the acoustic impedance difference of two kinds of medium. 1 pet. Almost all is reflected, such as sound waves spread from the liquid or solid Hugh to gas, or transmitted by gas into a liquid or a solid sound wave type level detection method using the characteristic of the sound waves, by measuring the sound waves from transmitting to receiving to level of interface reflection wave between the time interval to determine the level of high and low.