Ultrasonic liquid level sensor with reflector and a method for calibrating the ultrasonic transducer
A liquid level sensor, ultrasonic technology, applied in the direction of sound wave re-radiation, liquid level indicator, test/calibration device, etc., can solve the problems of ultrasonic signal travel length distortion, trouble and other problems
Active Publication Date: 2021-07-13
FLOWLINE
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Problems solved by technology
[0003] Some conventional transducers contain several mirrors, however, these mirrored transducers suffer from two main factors
First, the mirror is not flat, which distorts the travel length of the ultrasonic signal, and second, the structure creates an undesirable surface in which the ultrasonic signal reflects and thus leads to false echoes
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[0022] In some embodiments, the disclosed sensors are ultrasonic liquid level sensors comprising one or more planar reflectors, such as mirrors, that deflect to measure, for example, liquid or solid material (e.g., powder particles) in a container. and particles) ultrasonic signal of the liquid level of materials such as.
[0023] In some embodiments, the transducer front faces are positioned vertically relative to the liquid surface, and thus large droplets of liquid cannot form on the front face, as the droplets will fall from the front face due to gravity. In some embodiments, the flat reflector is placed at an angle (eg, about 45 degrees) relative to the front face of the transducer to provide a path for the ultrasonic signal having an equal distance across the front face of the receiving transducer. In some embodiments, the disclosed invention incorporates a structure that eliminates the possibility of creating a flat face that would reflect the ultrasonic signal back to ...
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An ultrasonic liquid level sensor comprises: a housing (204); an ultrasonic transducer (206), which has a front surface for emitting ultrasonic signals; a reflector (209), which has a The front surface is an angled flat surface for reflecting and directing the ultrasonic signal to the surface of the material in the container; and a scattering structure (213) for reflecting the undesired scattered ultrasonic signal away from the surface of the liquid , wherein the ultrasonic signal is reflected from the surface of the material and reflected from the planar surface of the reflector and received by the ultrasonic transducer. The invention also discloses a method for calibrating the ultrasonic transducer to determine the working frequency for generating the echo signal with the maximum amplitude.
Description
technical field [0001] The present invention relates generally to liquid level detectors, and more particularly to an ultrasonic liquid level sensor having one or more reflectors. Background technique [0002] Ultrasonic liquid level sensors monitor and detect liquid levels in containers by using ultrasonic signals. Such ultrasonic level sensors measure the time it takes for an ultrasonic signal to travel from the transducer to the liquid surface and back to the sensor, and then determine the level of the fluid based on the known sound velocity and time. That is, ultrasonic waves are reflected from the surface of the liquid, and the time at which the reflected (echoed) ultrasonic waves are detected back at the transducer is determined. Since the velocity of the ultrasound waves is known, the measured travel time of the waves provides a measure of the distance to the liquid surface. With knowledge of the geometry (e.g., the height of the tank and where the sensor is mounted...
Claims
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IPC IPC(8): G01F23/296G01F25/00G01S7/52
CPCG01F23/2968G01S7/52004G01S7/521G01S15/10G01S15/88G01S7/52G01F23/2962G01F25/20
Inventor 赖瑞·E·卡特麦可·R·艾勒特麦可·J·拉菲堤
Owner FLOWLINE