Boots – shoes – and leggings
Patent
1996-05-07
1998-09-08
Trammell, James P.
Boots, shoes, and leggings
364556, 364561, 356 5, G04F 1000, G01C 308
Patent
active
058054685
ABSTRACT:
The invention relates to a method for determining the light transit time along a measurement path arranged between a measuring apparatus and a reflecting object, wherein a light transmitter contained in the measuring apparatus sends a modulated light signal s(t) along the measurement path, which is received by a light receiver contained in the measuring apparatus, is converted into a received signal e(t), and is evaluated in the measuring apparatus, wherein the light signal s(t) to be transmitted is stored in the form of digital values in a transmitter memory; wherein the stored digital values are sequentially read out and supplied to a digital/analog converter acted on by a clock signal and controlling the light transmitter; wherein the received signal e(t) is supplied to an analog/digital converter acted on with the identical clock signal; wherein the values delivered by the analog/digital converter are deposited in a receiver memory; wherein a correlation function k(t) is formed between the signals s(t) and e(t) stored in the transmitter memory and in the receiver memory; and wherein the maximum K.sub.max =k(t.sub.max) of the correlation function k(t) is found, with t.sub.max corresponding to the transit time to be determined, and also to an apparatus for carrying out this method.
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Bui Bryan
Erwin Sick GmbH - Optik-Elektronik
Trammell James P.
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