# US 5,703,679 A · Transceiver head for longitudinal doppler speed indicator

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- Number: US 5,703,679 A
- Document ID: US5703679A
- Status: Granted
- Kind: A
- Application number: 08/532,323
- Filed: 1995-09-22
- Granted: 1997-12-30
- Earliest claimed: 1994-09-22
- Assignees: Sextant Avionique
- Inventors: Bertrand Morbieu
- Web page: https://patentgrep.com/patent/US5703679A

## CPC

- G01S 7/499: using polarisation effects
- G01S 17/58: Velocity or trajectory determination systems; Sense-of-movement determination systems
- Y02A 90/10: Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE

## Abstract

Transceiver head for a longitudinal Doppler speed indicator. Transceiver head for a longitudinal Doppler speed indicator with at least one pair of measuring axes. It comprises: a laser (1); polarization switching means (4) on the path of the laser beam; polarization separating means (5) on the path of the polarized beam that comes from the switching means; control means (5) for switching the switching means alternately from one state to another to direct the beam alternately to one measuring axis and then to another depending on its polarization state.

## Claims

### Claim 1

A transceiver head for a longitudinal laser speed indicator with at least one pair of measuring axes, comprising:
a laser;
a polarization switching means on the path of the laser beam that comes from said polarization switching means, wherein said polarization separating means are arranged such that said beam which comes from said separating means is moved parallel to itself during switching, with output optics being arranged to direct said beam to one of said measuring axes depending upon its movement; and
control means for switching said switching means from one state to another to direct said beam alternately to one measuring axis and then to another depending upon its polarization state.

### Claim 2 (depends on 1)

A transceiver head according to claim 1, wherein said polarization separation means comprise a Glan prism.

### Claim 3 (depends on 1)

A transceiver head according to claim 1, wherein said polarization switching means comprises a electrooptic effect means.

### Claim 4 (depends on 1)

A transceiver head according to claim 1, wherein said polarization switching means comprises a elastooptic effect means.

### Claim 5 (depends on 1)

A transceiver head according to claim 1, further comprising a telescope that forms output optics.

### Claim 6

A transceiver head for a longitudinal laser speed indicator with at least one pair of measuring axes, comprising:
a laser;
a polarization switching means on the path of the laser beam that comes from said polarization switching means,
control means for switching said switching means from one state to another to direct said beam alternately to one measuring axis and then to another depending upon its polarization state; and
a quarterwave plate at the output of said polarization separation means.

### Claim 7 (depends on 6)

A transceiver head according to claim 6, wherein said polarization separation means comprise a Glan prism.

### Claim 8 (depends on 6)

A transceiver head according to claim 6, wherein said polarization switching means comprises a electrooptic effect means.

### Claim 9 (depends on 6)

A transceiver head according to claim 6, wherein said polarization switching means comprises a elastooptic effect means.

### Claim 10 (depends on 6)

A transceiver head according to claim 6, further comprising a telescope that forms output optics.

### Claim 11 (depends on 6)

A transceiver head according to claim 6, wherein said separating means are arranged such that the beam which comes from them is moved parallel to itself during the switching, with output optics being arranged to direct the beam to one of the measuring axes depending on it movement.