Non-Contact DVRT®
By HBK Microstrain
• LORD Non-Contact DVRT®
• Sub-micron resolution with large stroke/size ratio
• High dynamic range for difficult measurements
• Ease of Use
• Non-contact position measurement
• Plug and play usability
• Easily customized to suit specific requirements
• Signal conditioning options for any application
Description
Ideal for difficult sensing applications, the Non-Contact DVRT® is designed to measure the displacement and proximity of a metal target without physical contact. The measurement is unaffected by interposed nonmetallic, non-conductive materials, such as polymers and biomaterials. The stainless shell of the device houses two coils; one for sensing and the other for temperature compensation. The coils and Teflon® cable are mounted on a stable PEEK substrate. This assembly is potted into the stainless housing using high-grade, vacuum-pumped epoxy and includes integral strain relief. This packaging allows the sensor to be used in applications requiring long-term immersion in water and saline solutions.
Electrical Specifications (Obtained using DEMOD-DVRT® and DVRT® with 800 Hz low pass filter at constant temperature)
| Measurement range NC-DVRT-1.0 NC-DVRT-2.5 |
1.0 mm 2.5 mm |
| Accuracy | ±0.2 to ±1% with polynomial calibration |
| Sensitivity | DEMOD output/sensor range |
| Signal to noise | standard – 1000 to 1with filter 3dB down at 800 Hz |
| Resolution | dependent upon displacement area |
| Frequency response | 800 Hz standard, 20 KHz optional |
| Temperature coefficient | offset 0.0039%/°C (typical) span 0.016%/°C (typical) dependent on target material |
| Hysteresis | ±2 microns (typical) |
| Repeatability | ±2 µm (typical) at constant temperature |
Mechanical Specifications
| Size
NC-DVRT®-1.0 |
diameter x length (thread)
4.83 mm x 19.0 mm (10-32 UNF-2A ) |
| Housing material | 300 series stainless steel |
| Attachment method | threaded stainless nuts |
| Leadouts | 45 cm, shielded, teflon insulated, stainless wire reinforced, multistrand conductors |
| Connector | keyed 4-pin Lemo, polyolefin relief |
| Operating temperature |
-55 to 175 °C |
| Cable diameter | 0.036 “ to 0.070 “ |