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Article #17359Re: Ultrasonic Distance Measurement
From: commgrp
Date: Sat, 14 Mar 1987 17:24
Date: Sat, 14 Mar 1987 17:24
27 lines
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1526 bytes
Re: Ultrasonic Rangefinders Simple sonic/ultrasonic rangefinder-- Requires two units, transmitter and receiver: Transmitter simultaneously emits flash of light and pulse of sound. Reciever starts timer when it detects light, stops timer when sound arrives. Time is proportional to distance between transmitter and receiver. Since the first sound to reach the receiver will be that which has travelled in a straight line between them, there will be no problem with echoes. Sound travels ~1100 feet per second, or about an inch in 1/10 ms. The wavelength of sound should be a fraction of the unit's resolution; about 40 kHz should be suitable for a unit which indicates the nearest inch. -- from "How to make an ultrasonic rangefinder" by Bill Mixon, reprinted in SPELEONICS 4 (v.1 no.4 winter-spring 1985-86) --- Frank Reid reid@gold.bacs.indiana.edu
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!utgpu!water!watnot!watmath!clyde!cbatt!ihnp4!inuxc!iuvax!iucs!silver!commgrp From: commgrp@silver.UUCP Newsgroups: sci.electronics Subject: Re: Ultrasonic Distance Measurement Message-ID: <24300005@silver> Date: Sat, 14-Mar-87 12:24:00 EST Article-I.D.: silver.24300005 Posted: Sat Mar 14 12:24:00 1987 Date-Received: Sun, 15-Mar-87 04:52:29 EST References: <8455@aero.ARPA> Organization: Indiana University BACS, Bloomington Lines: 27 Nf-ID: #R:aero.ARPA:-845500:silver:24300005:000:863 Nf-From: silver.bacs.indiana.edu!commgrp Mar 14 12:24:00 1987