10m-10cm distance measurement with 1cm accuracy at a rate of 50Hz

 · 2005-03-24T11:23:57+00:00

Do you know any small size, light weight distance sensor with the following specs; * Range : 10cm to 1000cm (10meter ) * Rate : 50 Hz (50 measurements/sec) * Accuracy : 1cm * Must operate on any surface (except transparent surfaces like glass) * Power requirement : Less than 5W * Weight : Lighter than 500grams * Vibrartion sensitivity : Must operate 0-500Hz

Mar 24, 2005 23 Replies

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Acceed See 21 years ago

=========== The Leica DISTOT plus is the only device in the world that offers the highest accuracy, attractive design and wireless data transfer by means of BLUETOOTH® in one package. Even if you are currently still working with paper and pencil, integrated BLUETOOTH® technology allows you to make the change at any time and to record your values electronically. The data can be transferred on site wireless to a PDA (Pocket PC) or directly to a laptop and easily used for other purposes.

Range of measurement: 0.2 up to 200 m (0.7 up to 650ft). Accuracy: ±1.5mm (0.06in) ===========

What is the theory behind laser ranging?

Thanks.

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Thread Ender 21 years ago

Time of flight. Just like sonar, but MUCH faster.

--TE

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Gordon McComb 21 years ago

Not always. A cheaper approach is to modulate the light beam, and then compare the phase of the return beam with an internal reference beam (or clock). Sometimes referred to as tone ranging. Yet another type, more suitable for shorter distances (say, up to 50-60 feet), uses interferometric methods, and are accurate to a quarter wavelength.

Leica's DISTO transits use phase measurement. They'd be much more expensive if they used time-of-flight.

File this under the "FWIW" and "who the heck cares?" departments!

-- Gordon

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Thread Ender 21 years ago

Gordon,

I thought the DISTO was time of flight. When using the phase technique or the interferometric method, is it still possible to use a servo mounted

45degree mirror to "pan" the beam around or does it mess up the measurement? I have been planning to use a DISTO on a future robot project.

--TE

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