Microminiature DVRT®
By HBK Microstrain
• LORD Microminiature DVRT®
• Micron resolution with large stroke/size ratio
• Frictionless design for robust use over millions of cycles
• Suitable for use in harsh fluids and environments
• Ease of Use
• World’s smallest linear displacement sensor
• Plug and play usability
• Easily customized to suit specific requirements
• Signal conditioning options for any application
Description
Ideal for critical linear displacement measurements, the Microminiature DVRT® delivers high performance in a tiny package. Advanced materials and electronics have resulted in a rugged, fast, and sensitive instrument, capable of submersion in aqueous environments. The Microminiature DVRT® features micron- to-sub-micron resolution, linear analog output, flat dynamic response to kHz levels, and very low temperature coefficients. Its free-sliding cores are extremely lightweight and utilize flexible, elastic, bio-compatible alloys to provide resistance to kinking and permanent deformation.
Electrical Specifications Obtained using DEMOD-DVRT® and DVRT® with 800 Hz low pass filter at constant temperature
| Linear Stroke Lengths | 3, 6 & 9 mm (standard version) 1.5 mm (high resolution version) |
| Accuracy | ± 1.5% using straight line ± 0.1% using polynomial |
| Sensitivity | DEMOD output/sensor range |
| Signal to noise | 2000 to 1 (with filter 3 dB down at 800 Hz, standard); 600 to 1 (unfiltered) noise measured peak to peak |
| Resolution | 1.5 µm for 3 mm stroke 3.0 µm for 6 mm stroke 4.5 µm for 9 mm stroke 300 nm for high resolution version |
| Frequency response | 800 Hz standard, 20 kHz optional |
| Temperature coefficient | offset 0.0029%/ °C (typical) span 0.030%/ °C (typical) |
| Hysteresis | ±1 micron |
| Repeatability | ± 1 micron |
Mechanical Specifications
| Overall body length | 11.3 mm for 3 mm stroke 18.7 mm for 6 mm stroke 26.8 mm for 9 mm stroke 11.3 mm for high resolution version |
| Outside diameter | 1.5 mm (standard version) 1.8 mm (high resolution) |
| Housing material | smooth 316 stainless steel;
4-40, 6-32 & 8-32 400 series stainless steel imperial threaded body options M3x0.5-6g, M3.5×0.6-6g, & M4x0.7-6g 400 series stainless steel metric threaded body options |
| Attachment method | threaded body |
| Leadouts | 45 cm, multi stranded, shielded, stainless steel reinforced, Teflon insulated |
| Connector | keyed 4-pin Lemo, polyolefin relief |
| Operating temperature | -55 to 175 °C |
| Core weight | 3 mm: 0.06 g, 6 mm: 0.07 g, 9 mm: 0.07 g, 1.5 mm: 0.06 g |
| Core material | 0.020” diameter super elastic NiTi alloy, 00-90 thread optional |
| Cable diameter | 0.036 “ |