Measuring apparatus having a diffraction grating for receiving a

Details Measuring apparatus having a diffraction grating for receiving a Measuring apparatus having a diffraction grating for receiving a

1994-12-27

1996-09-17

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356 285, G01B 902

Patent

active

055574076

ABSTRACT:
A speed measuring apparatus includes a light source unit for generating a diverged light beam, a diffraction grating for generating diffracted light when the diverged light beam from the light source unit is made to enter the diffraction grating, an optical device for converting the diffracted light into a collimated light beam, and an optical detecting device for receiving interference light formed by projecting the collimated light on the object to be measured. The speed measuring apparatus measures the speed of the object by using signals corresponding to the frequency shift of the light obtained by the optical detecting device.

REFERENCES:
patent: 5216478 (1993-06-01), Kadowaki et al.
patent: 5229830 (1993-07-01), Ishida et al.
patent: 5256885 (1993-10-01), Takamiya et al.
patent: 5272512 (1993-12-01), Kadowaki et al.
patent: 5355220 (1994-10-01), Kabayashi et al.

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