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PicoQ® Sensor Technology
Ultra-low Position Noise
Outstanding Accuracy
>>Extended Cable Lengths without Performance Loss
No Performance Loss in Vacuum

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Measuring Atomic Steps
Sub-Nanometer Motion
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Nanopositioning Accuracy

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Extended Cable Lengths without Performance Loss


An unpublicized problem with capacitive position sensors is that their calibration and resolution are dependent on cable length. This problem limits the versatility of any nanopositioner that contains a capacitive sensor, and can be a major drawback for both research and OEM applications. PicoQ® sensor technology, used exclusively by Mad City Labs, is not affected by cable length. Mad City Labs nanopositioning systems can have custom cable lengths and the cables can easily be extended by adding standard, well-shielded extension cables. Mad City Labs nanopositioning systems with PicoQ® sensor technology also do not require costly signal conditioning boxes.

The following measurement confirms that nanopositioning systems with PicoQ® sensor technology maintain low position noise after the addition of extension cables. In the experiment, the position noise of the nanopositioning system was measured with the standard cable length of 6 feet [1.8 m]. Noise measurements were repeated after adding 9 foot [2.8 m] commercially available cables to extend the cable length to a total of 24 feet [7.3 m] and 42 feet [12.8 m]. The difference between the measurements at different cable lengths was negligible, showing that cable length does not affect the performance of nanopositoining systems with PicoQ® sensor technology.

position noise spectrum of 200um nanopositioning system with various cable lengths

Position noise spectrum of a 200 micron range nanopositioning system with PicoQ® sensors. Three experiments were performed with the standard cable length of 6 ft [1.8 m] and with additional extension cables adding up to total cable lengths of 24 feet [7.3 m] and 42 feet [12.8 m].
mclgen@madcitylabs.com       phone: 608.298.0855       fax: 608.298.9525

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