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DEMOD- DVRT® -TC

DEMOD- DVRT® -TC
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LORD PRODUCT DATASHEET Temperature Compensated Signal Conditioner Designed for ease of use and general versatility, this printed circuit card provides complete temperature compensated conditioning for any sensors. The DEMOD-DVRT® -TC utilizes both alternating current and direct current excitation of the sensor’s inductive bridge to accurately measure position in the face of temperature gradients. Each card contains the requisite components to facilitate plug-and-play use, including active, jumper selectable low pass filters, input supply line filters with reverse input protection, and output line buffers. The DEMOD-DVRT® -TC sine wave excitation and synchronous demodulator provide excellent noise rejection and elimination of thermally induced potentials. Features & Benefits System Overview High Performance Many oscillator/demodulator type signal conditioners for use with half bridge LVDT, LORD MicroStrain® DVRT® and noncontacting variable reluctance/eddy current sensors have relied on the use of two coils arranged in a differential manner to amplify position and to cancel temperature effects. However, this method of compensation is only effective when both coils experience the same temperatures simultaneously. In practice, thermal gradients commonly occur across sensing coils, resulting in a difference in the sensing coil’s resistance as compared to the reference coil. The DEMOD-DVRT® -TC Temperature Compensated Signal Conditioner overcomes this limitation by injecting both AC and DC excitation into the coils, and demodulating the AC component of the bridge signal separately from the DC component. The differential signal produced by the bridge in response to the DC excitation is amplified and subtracted from the demodulated (and amplified) AC response. The resulting output is free from temperature gradient errors. Linear plunger type and noncontacting inductive sensors are now available in very small diameters (<1 mm), and single coil sensors possess nearly 1:1 body length-to-stroke ratios, without sacrificing thermal stability. temperature compensated signal conditioning precision synchronous demodulation rapid warm-up time Ease of Use plug-and-play with LORD MicroStrain® motherboards compatible with all LORD MicroStrain® DVRT sensors adjustable trimmers to set resolution range Applications Used with LORD MicroStrain® DVRT® sensors for: Invivo Strain, Micromotion and deformation in Bone & Tissue Process Control for Production-Line Monitoring Miniature Position Control Elements Linear & Angular Motion Control Measuring Strain and Deflection in Materials and Structures Dimensional Gauging for Quality Control LORD MicroStrain® Motherboard products are designed to house the DEMOD-DVRT® -TC. The Motherboards have a desktop console form factor and provide a plug-and-play chassis. The Motherboard variously provides power, grounding, multiplexing, analog-to-digital conversion, configuration, analog output, RS-232 output and LCD display. Motherboards can support 1 to 8 DEMOD-DVRT® -TC, have a small footprint, and operate within a wide temperature range.

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DEMOD- DVRT® -TC Temperature Compensated Signal Conditioner Compensates for a temperature gradient across the sensor transducer bridge Electrical Block Diagram High Level Analog Output Compensated Stage +Vsupply—I Reverse input diode protection ground plane ©Copyright 2013 LORD Corporation MicroStrain®, S-DVRT®, SG-DVRT®, M-DVRT® MG-DVRT® NC-DVRT®, DEMOD-DC® and □EMOD-DVRT® are trademarks of LORD corporation. Specifications are subject to change without notice. LORD Corporation MicroStrain® Sensing Systems Patent Pending

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