Máy đo độ rung Aco 7144/3348D Infrasonic Meter

Ngày đăng: 21/35/2019 - 666 lượt xem

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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

【Specification】Infrasonic Meter TYPE 7144

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

【Specification】Amplifier TYPE 3348D

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