Accession Number:

AD0163679

Title:

Remotely Sensing Optical Tachometer.

Descriptive Note:

Patent,

Corporate Author:

OFFICE OF THE SECRETARY OF THE ARMY WASHINGTON D C

Personal Author(s):

Report Date:

1972-04-04

Pagination or Media Count:

4.0

Abstract:

The invention relates to a remotely sensing optical tachometer for measuring the spin rate of a rotating member. The invention provides a simple optical system for measuring the spin andor rate of change of spin, of, for example, an artillery shell or test projectile. The system provides a real-time readout of the spin rate, and requires no instrumentation aboard the projectile except for a small plane mirror that is attached obliquely to one end of the spinning projectile. The system directs a collimated beam of light that is reflected off the plane mirror back into the system where it traverses a stationary reticle that has alternating transparent and opaque sectors thereon. The frequency with which the light passes through the transparent portions of the reticle provides a direct indication of the spin rate of the rotating member.

Subject Categories:

  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE