LF-24DC震動傳感器

The LF-24/DC (Dual Compartment) Low Frequency Geophone has been designed to accommodate applications where the smallest form factor is required for vibration-monitoring and low-frequency seismic measurements. The device uses a low power electronic circuit to provide an inverse-filter function below the geophone natural frequency to compensate for the 12 dB/oct signal roll-off, extending the recording bandwidth. This compensation circuit permits the use of a higher-natural frequency geophone, allowing for high impact shocks that could seriously damage conventional low frequency geophones. In addition the circuit is fully temperature compensated to maintain its damping and Sensitivity characteristics over the operating range.

Specifications: LF-24 /DC Low Frequency Velocity Sensor FREQUENCY LF-24/DC 1Hz Natural Frequency 1 Hz LF-24/DC 0.3Hz Natural Frequency 0.3 Hz Tolerance ± 10% Maximum tilt angle for specified Fn Vertical type 10° Horizontal type 5° Spurious frequency >240 Hz (typically 280 Hz) DISTORTION Distortion coil with 0,7 in/s p.p. Vertical <0.10% coil to case velocity Horizontal <0.15% Distortion measurement frequency 12 Hz DAMPING Damping 100% SENSITIVITY Sensitivity 15 V/m/s (0.38 V/in/s) Tolerance ± 10% Equivalent input noise 300nm/s. sqrt(Hz) above 10 Hz Power supply voltage ±11 to ±25V DC Supply current ±2mA at 11V ±3mA at 15V ±6mA at 25V LF-24/DC 1Hz Offset 4mV Max. LF-24/DC 0.3Hz Offset 50 mV Max.

The LF-24/DC (Dual Compartment) Low Frequency Geophone has been designed to accommodate applications where the smallest form factor is required for vibration-monitoring and low-frequency seismic measurements. The device uses a low power electronic circuit to provide an inverse-filter function below the geophone natural frequency to compensate for the 12 dB/oct signal roll-off, extending the recording bandwidth. This compensation circuit permits the use of a higher-natural frequency geophone, allowing for high impact shocks that could seriously damage conventional low frequency geophones. In addition the circuit is fully temperature compensated to maintain its damping and Sensitivity characteristics over the operating range.