Instrument and method for measuring a periodic motion

Details Instrument and method for measuring a periodic motion Instrument and method for measuring a periodic motion

1998-10-19

2000-01-04

Rosenberger, Richard A.

Optics: measuring and testing

Motion stopping

G01P 340

Patent

active

060116145

ABSTRACT:
The invention concerns an instrument (50) and a method for measuring an essentially periodic motion, which has a first average frequency, of an object (10). An image of the object (10) is produced by means of an optical window (30), which comprises liquid crystals (31) to be electrically controllable between different states of transmission. A periodic transmission change, corresponding to the periodic motion, of the optical window (30) between a state with relatively low transmission and a state with relatively high transmission is accomplished, such that the motion of the image (B) obtains a second average frequency, which is lower than the first average frequency. By means of an electronic image-analysing means (20), the image (B) of the periodic motion of the object (10) is received via the optical window (30), and an indication is made to show when the second average frequency falls below a predetermined value.

REFERENCES:
patent: 4498868 (1985-02-01), Schuss
patent: 4600300 (1986-07-01), Rotello
patent: 5029987 (1991-07-01), Shinomiya
patent: 5267067 (1993-11-01), Wiget
patent: 5341435 (1994-08-01), Corbett et al.

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