# US 5,335,058 A · Time series signal multichannel frequency analyzer using liquid crystal panel

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- Number: US 5,335,058 A
- Document ID: US5335058A
- Status: Granted
- Kind: A
- Application number: 07/988,481
- Filed: 1992-12-10
- Granted: 1994-08-02
- Earliest claimed: 1991-12-11
- Assignees: Agency of Industrial Science and Technology; Ministry of International Trade & Industry
- Inventors: Tomoaki Eiju; Kiyofumi Matsuda; Thomas H. Barnes; Shigeru Kokaji
- Web page: https://patentgrep.com/patent/US5335058A

## CPC

- G01P 5/26: by measuring the direct influence of the streaming fluid on the properties of a detecting optical wave
- G06E 3/005: {using electro-optical or opto-electronic means}
- G01P: MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT (measuring or recording blood flow A61B5/02, A61B8/06; monitoring speed or deceleration of electrically-propelled vehicles B60L3/00; vehicle lighting systems adapted to indicate speed B60Q1/54; determining position or course in navigation, measuring ground distance in geodesy or surveying G01C; combined measuring devices for measuring two or more variables of movement G01C23/00; measuring velocity of sound G01H; measuring velocity of light G01J7/00; measuring direction or velocity of solid objects by reception or emission of radiowaves or other waves and based on propagation effects, e.g. Doppler effect, propagation time, direction of propagation, G01S; measuring speed of nuclear radiation G01T; measuring acceleration of gravity G01V; {measuring or recording the speed of trains B61L23/00; speed indicators incorporated in motor vehicles B60K35/00; measuring frequency or phase G01R; traffic control G08G})
- G06E: OPTICAL COMPUTING DEVICES (digital storage using optical elements G11C13/04)

## Abstract

A time series signal multichannel frequency analyzer comprises a Fourier transform lens, a liquid crystal panel disposed at the front focal plane of the Fourier transform lens, means for inputting a time signal from a different signal source to each scanning line of the liquid crystal panel, observation means disposed at the rear focal plane of the Fourier transform lens, and a cylindrical lens disposed between the Fourier transform lens and an observation plane of the observation means.

## Claims

### Claim 1

A time series signal multichannel frequency analyzer using a liquid crystal panel, comprising a Fourier transform lens, a liquid crystal panel provided with scanning lines and disposed at a front focal plane of the Fourier transform lens, means for assigning time series signals from different signal sources to the individual lines of the liquid crystal panel, observation means disposed at a rear focal plane of the Fourier transform lens, and a cylindrical lens disposed between the Fourier transform lens and an observation plane of the observation means.

### Claim 2 (depends on 1)

A multichannel frequency analyzer according to claim 1, wherein the cylindrical lens is positioned so as to focus an output from the Fourier transform lens on the panel surface.

### Claim 3 (depends on 1)

A multichannel frequency analyzer according to claim 1, wherein the cylindrical lens has a D-shaped section.

### Claim 4 (depends on 1)

A multichannel frequency analyzer according to claim 1, wherein the cylindrical lens has an O-shaped section.