Pulsed remote gauge

A method for measuring the separation between two spaced light-reflecting surfaces by means of a single laser pulse. The reflected light is divided into two beams which are then projected at the same angle theta onto the same area on a photographic film to form interference fringes. The film is deve...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	PATTEN, RAYMOND A, BLODGETT, JERRY A
Format:	Patent
Sprache:	eng
Schlagworte:	MEASURING MEASURING ANGLES MEASURING AREAS MEASURING IRREGULARITIES OF SURFACES OR CONTOURS MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS PHYSICS TESTING
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Beschreibung
Zusammenfassung:	A method for measuring the separation between two spaced light-reflecting surfaces by means of a single laser pulse. The reflected light is divided into two beams which are then projected at the same angle theta onto the same area on a photographic film to form interference fringes. The film is developed, placed on a translating platform, and passed through the beam of a CW laser, a portion of the beam being diffracted by the interference fringes recorded on the film. The distance chi between the high-intensity points of adjacent interference regions is measured and the separation of the two light reflecting surfaces is calculated from the formula d= chi sin theta .