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Primary Examiner: Nelms, David C.
Assistant Examiner: Hostetter, Darwin R.
Attorney: Hume, Clement, Brinks, Willian & Olds, Ltd.

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Title: Apparatus for measuring projectile velocity

Abstract: An apparatus for detecting the passage of a moving object such as a truncated stern projectile includes a laser light screen, a photo sensor, and a signal processor. The intensity signal produced by the photo sensor is processed to generate an output pulse at the instant when the first time derivative of the intensity is greatest. For truncated stern projectiles this occurs when the projectile exits the light screen.

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Inventors: Michel, Dieter (Traunstein, DE, US)
Schmitt, Walter (Sondermoning, DE, US)

Application Number: 966365
Filing Date: 1978-12-04
Publication_date: 1981-02-24
Assignee: Dr. Johannes Heidenhain GmbH (Traunreut, DE)
Primary Class(es): 250/222.1 356/28
Other Classes:
US Patent Ref:

2409672	Oct, 1946	Fischer et al.
2769492	Nov, 1956	Ostergren.
3495893	Feb, 1970	Geusic et al.
3524354	Aug, 1970	Frank et al.
3675030	Jul, 1972	Tanenhaus.
3695749	Oct, 1972	Stapleton.
3830568	Aug, 1974	Allen.
3865487	Feb, 1975	Andermo.
3989378	Nov, 1976	Heitmann et al.
4155647	May, 1979	Michel.

Other Refs: 216323426107082259371

Jun, 1973	DE.
Sep, 1978	DE.
Aug, 1975	FR.

Other References: Jenkins et al., "Fundamentals of Optics", 3rd Ed., McGraw-Hill, 1957, pp. 239-240.