LVR vs LVDT: comparing two approaches to non-contact linear position sensing.
LVDTs are widely used for non-contact linear position sensing, especially in demanding environments. LVR — Linear Variable Resonance — is a patented alternative that uses a frequency-based measurement approach instead of relying on analog signal amplitude.
A published comparison of LVR and LVDT parameters.
The table below is adapted from the LRT Sensors white paper and should be treated as a technology comparison for engineering review, not as a substitute for application-specific testing.
| Parameter | LVR | LVDT |
|---|---|---|
| Fundamental output signal | Digital / frequency-based | Analog |
| Operating temperature range | -70°C to 200°C; optional to 450°C; potential above 1000°C | -55°C to 200°C |
| Stroke-to-length ratio | 2:1 | 3:1 |
| Resolution | 0.001% full scale | 0.1% full scale |
| Wires to electronics | 2 | 4 or 6 |
| Accuracy | 0.01% full scale | 0.25% full scale |
| Temperature sensitivity | <3 ppm/°C | >50 ppm/°C |
| Requires shielding from external magnetic fields | No | Yes |
LVR avoids relying on analog amplitude as the primary measurement.
LVDTs rely on analog signals and compensation for voltage, resistance, and phase effects. LVR measures a resonant frequency, which is converted into a digital value and then into the final position output.
LVR may be worth evaluating when an application requires non-contact linear position sensing but is constrained by high temperature, magnetic fields, electrical noise, remote electronics, or harsh-environment packaging.
Evaluating an LVDT alternative?
Send the application details and LRT Sensors can help determine whether LVR is worth reviewing for your linear sensing challenge.