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Low-cost optical telemeter (or range-finder)

05 FR GEFC 0BPY

 

Abstract
 A French laboratory, CNRS-associated, has patented a new lost-cost optical telemetric system for measuring distances. The technology is based on time-of-flight and is using a CW laser diode emitting at 1,55 µm. Simpler than classical systems, it can be used for various applications like devices for geometers, anti-collision devices, systems for guiding robots. The laboratory is looking for license agreement with an industrial partner able to design and manufacture the product.

 

Description
 A French optical laboratory has patented a new and low-cost optical telemetric system based on time-of-flight and using a low-frequency (10-100 kHz) modulated laser diode emitting at 1.55 µm. Compared to classical telemeters, which are very complex and require sophisticated electronic systems, this one uses only standard components already developed for the telecommunication industry. The signal processing is simplified. This system can be easily adapted to the microwave field or to acoustics: so it can be used in various atmospheric conditions or in aquatic environment.
Allowing distance measurements from 1m to 200 m with an accuracy of 2/1000, this telemeter could be used for various applications like:
- Short distance measuring devices: white cane for blind people, optical meter (tools)
- Devices for geometers (specific tools)
- Anti-collision devices (armament, aeronautics, automotive, transport, etc.)
- Guiding and vision devices for robots, distance measurement for table on machine-tools (industrial processes, robotics, machine-tools)
- Telemeters for shooting and for guiding missiles (armament, weapons industry)

The device is still experimental and the laboratory is looking for cooperation with industry. The partner sought should be able to develop a prototype and to be in charge with industrialisation and to manufacture the device. The laboratory is able to make further R&D for the industrial partner if necessary.

Innovative Aspects:
- Use of CW (continuous wave) laser diode
- Use of modulation by low frequency (less than 100 kHz)
- Direct modulation of the forward current of the laser diode without degrading its performance

Main Advantages:
- Simplicity with good relative accuracy
- Low-cost system: standard components, analogical measurement, simple signal processing
- Independence of the source spectrum profile and bandwidth
- Easily adapted to microwave field or acoustics

 

Current Stage of Development
Development phase - Laboratory tested

 

Intellectual Property Rights
Patent(s) applied for but not yet granted

Collaboration details
Technical Co-operation, License agreement

A manufacturer of distance measurement instrumentation is sought to realise a prototype, and to design, manufacture and sell the product


For more information
 Anne-Marie VIEUX

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