DEMOD-DVRT-TC
DEMOD-DVRT-TC
Carrier Amplifier-Oscillator/Demodulator for DVRTs®; Inductive, Capacitive and Resistive Bridge Circuits.
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.
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.
Many oscillator/demodulator type signal conditioners for use with half bridge LVDT, MicroStrain® DVRT® and non-contacting 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 non-contacting 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.
Used with MicroStrain DVRT® sensors for:
- miniature control elements for automotive and robotic systems
- process control for production-line monitoring
- dimensional gauging for quality control applications
- measuring strain and deflection in materials science and civil structures
- linear/angular positioning of optical components
- miniature force, torque, acceleration sensors
- measuring strain, micromotion and deformation in bone and tissue
- easy plug and play implementation with MicroStrain Motherboards
- compatible with all DVRT® sensors
- temperature compensated signal conditioning
- gain is factory adjustable from 10-10,000
- short warm up time
- demodulation is synchronous, DC output
- operating temperature is -40°C to +85°C
- adjustable trimmers allow user to set resolution range
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Compensates for a temperature gradient across the sensor
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How To Order
To discuss configuration for your specific system requirements, please contact sales at sales@microstrain.com or call 802-862-6629.
For large quantity orders or OEM discussions, please contact mirobinson@
