Method of calibrating a concentration sensor
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United States of America Patent
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Dec 12, 2017
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N/A
app pub date -
May 1, 2015
filing date -
May 1, 2015
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Abstract
A method for calibrating an ultrasonic sensor including a transducer, a reflector spaced a known distance from the transducer, and a memory. A water bath is heated to approximately fifty centigrade and the ultrasonic sensor is at least partially submerged in the water bath. When submerged, an ultrasonic wave is transmitted through a portion of the water bath from the transducer. The ultrasonic wave is transmitted toward the reflector and a reflected ultrasonic wave is received back at the transducer. A time of flight of the ultrasonic wave is measured. A calibration coefficient is determined based on the time of flight of the ultrasonic wave and an expected time of flight of the ultrasonic wave. The calibration coefficient is loaded into the memory of the ultrasonic sensor.
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