Capacitive displacement sensor: high precision in tiny spaces

Designing machines that require embedded, high-precision position sensing can be a frustration for engineers and designers. Non-contact sensing with resolutions in the nanometer range often means a large rack-mount or modular bench-top style design. Machinery may not have the space available for such a system. In addition, the sensor electronics may have front panel adjustments which are not easily accessible once installed in a machine. These larger precision systems can also be challenging to the design's cost controls.

Lion Precision's new CPL350 now provides a better option. The single-channel system provides measurement performance approaching that of their top-of-the-line Elite Series modular systems. Resolutions as high as 0.0007 per cent at 100Hz or 0.004 per cent at 15kHz. It does all this in 2×2×4 inch package (50×50×200mm). A BNC single-ended output is provided, or for maximum resolution with longer cable runs, a differential output is also available.

With no user adjustments or displays, the CPL350 electronics can be installed in out-of-the-way places. Sensors typically ship with 15kHz bandwidth. Users can access an internal dip-switch to set the bandwidth to 15kHz, 10kHz, 1kHz, 100Hz. The bandwidth selection allows users to opt for higher resolutions or higher speeds.

The sensor is easier on designers' budgets at approximately 35 per cent lower cost than a single-channel Elite Series system.

CPL350 specifications:

• Measurement Ranges: 10um to 12.5mm (0.0004 to 0.5 inches)
• Maximum Bandwidth: 15 kHz
• Typical Linearity: 0.5 per cent F.S.
• Thermal Stability: 0.04 per cent F.S./degC
• Differential Output: +/-10 V
• Single Ended Output: +/-10 V
• Operating Temperature: 4-50degC
• Power Requirements: +/-15V DC (External power supply included with device)

More information is available on the CPL350 Capacitive Displacement Sensor web page.