PRODUCTS
- Vibration related products
- Infrasonic meter
Infrasonic Meter
TYPE 7144/3348D
Infrasonic Meter TYPE 7144/3348D is ultralow-frequency sound pressure level meter to measure infrasonic or aerial vibration generated by explosive eruption of volcanoes.Measurement of ultralow-frequency sound pressure is possible in the range 2Pa～632Pa and 0.1～100Hz.
Reduction of input impedance has been realized by the employment of ceramic sensor, which has then offered an environmental suitability such as long-term outdoor measurement.
Aerial vibration is rapid pulsation of air generated around the crater by the explosive eruption of volcanoes, which thus travels as low-frequency sound pressure.
Due to ultralow-frequency sound pressure, the aerial vibration can not be heard by human ear but easily vibrates the building walls or windows during the propagation, sometimes giving a big damage such as breakdown of windows.
Infrasonic Meter means air vibrations are generated when a rapid change in barometrical pressure happens in the crater because of the eruption of the explosion of the volcano, and the impact spreads as a sound wave.
Volcano SHINMOEDAKE viewed from our Miyazaki factory.
Installation site of Infrasonic Meter
| Frequency range | 0.1～100Hz |
|---|---|
| Sensitivity(including Preamp) | 3.5mV/Pa |
| Dynamic range | 0.0632Pa～632Pa（Effective value) (When each range is full-scale) |
| Sensor | Ceramic type |
| Preamplifier | Charge converter |
| Size | Φ23.77mm × 130mm |
| Input | Channel | 1Channel |
|---|---|---|
| Terminal | 6P connector(R03-R6F made by TAJIMI) | |
| A:+15V B:-15V C:SIG E,F:GND | ||
| Output | Terminal | BNC connector (Digital:USB command) |
| Voltage | Real-time waveform output ±1V/F.S.(632Pa) | |
| Digital | 16Bit (±32767/F.S.) | |
| Noise Level | 2mVrms or less | |
| Measurement Range | 2Pa～632Pa(Effective value) | |
| Range | 2Pa/6.32Pa/20Pa/63.2Pa/200Pa/632Pa 6stages | |
| Gain stability level | Within ±1%(Output terminal) Full-scale | |
| Linearity | Within ±1%(Output terminal) Full-scale | |
| Phase lag | ±2°(Positive aspect) | |
| Indicator | LCD:16 characters,2lines Display cycle:1 second | |
| Display of Measurement value, Low-pass filter, Level range | ||
| Distortion of higher harmonics wave | 1% | |
| Frequency response | 0.1Hz～100Hz ±3dB (when Low-pass filter OFF) | |
| Dynamic response | time constant 1 second (Slow),10 seconds | |
| Low-pass filter | 100Hz -3dB Attenuation feature -12dB/oct | |
| Electric calibration | Electric calibration by built-in oscillator(sine wave of 80Hz) | |
| I/O terminal | Control and digital output (USB1.1) of Infrasonic Meter by PC | |
| Power | DC+12V ±10% Terminal stand M3 or AC adapter | |
| Power consumption | Approx.1.5W(Approx.115mA) or less | |
| Operating temperature limit | -20℃～50℃ / 90％ or less(Dewfall strict prohibition) | |
| Size and Weight | 160(W)×94(H)×230(D) | |
| External calibration | Piston phone 31.6Pa | |
