Contactless air range finding method on the basis of P89LPC932


Posted on Feb 5, 2014

The defect that can`t be overcome exists in some special occasions in some traditional distance measuring ways. For example, the measurement of liquid level is a kind of range measurement, the traditional electrode law is to adopt the location of difference and is distributed the electrode, measure the liquid level by for the electricity or pulsin


Contactless air range finding method on the basis of P89LPC932
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g, the electrode is soaked in underwater or other liquid for a long time, it is extremely easy to be corroded, electrolyzed, lose the sensibility. Can solve these problems while utilizing the ultrasonic measurement distance. The ultrasonic ranger that this text designs uses three kinds of range finding mode selection jumper wires J1 short-range, middle distance, but regulating distance. Its whole scheme will be in order to produce the echo signal when push and measure the key, the probe sends supersonic wave, as supersonic wave meets obstacles; The system sends the back wave signal amplification that the probe receives into the control device; The measurement circuit of temperature measures the temperature, through calculating the distance examined, reveal on the nixie display, the distance of display of the last 4, the top 2 reveals the temperature. Utilize the principle such as Fig. 1 of the ultrasonic measurement distance to show and show, describe as briefly: The supersonic wave sent regularly is reflected while encountering obstacles, the backward wave receives and turns into the electric signal via the receiver, so only examine the mistiming of setting out and giving and receiving T, then according to formula 1 Can find the distance: In the type: C is a propagation velocity of the supersonic wave in the air, C is 331 m/s at 0, C is 347 m/s at 25, it and ambient temperature T unit: Relation such as formula 2 :...




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