High resolution measuring device for time difference

Details High resolution measuring device for time difference High resolution measuring device for time difference

1991-04-18

1991-12-24

Dixon, Joseph L.

Boots, shoes, and leggings

3281291, 342127, 356 5, 364561, G01C 308, G01S 1308

Patent

active

050758780

ABSTRACT:
High resolution measuring systems use a continuous series of laser pulses in measuring distance to an object. An approximate time difference between transmitted and reflected pulses is derived. A second, more accurate, time difference is derived through use of a reference signal sampled in correlation to the pulse signal in order to derive a sampled waveform signal having a period which is long relative to the period of the pulse signal. Phase difference measurements of this sampled waveform provide delay time measurements of high accuracy. The high accuracy and approximate time difference signals are combined to determine time difference between measurement pulses with increased resolution. Time difference is converted to precision distance measurments, with greater accuracy available by averaging several measurements. Several embodiments are described.

REFERENCES:
patent: 4053888 (1977-10-01), Robin et al
patent: 4413904 (1983-11-01), Hamada et al.
patent: 4455556 (1984-06-01), Koshio et al.
patent: 4531833 (1985-07-01), Ohtomo
patent: 4560271 (1985-12-01), Fumio
patent: 4715706 (1987-12-01), Wang
patent: 4744653 (1988-05-01), Sano et al.
patent: 4818100 (1989-04-01), Breen
patent: 4855585 (1989-08-01), Nonaka
patent: 4856893 (1989-08-01), Breen
patent: 4861158 (1989-08-01), Breen
patent: 4861159 (1989-08-01), Breen
patent: 4895441 (1990-01-01), Allen, Jr.
patent: 4908784 (1990-03-01), Box et al.

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