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Underwater Sensors


INTRODUCTION

PCB® has extensive experience with underwater vibration and unsteady, rapid fluctuating, pressure measurements. Our experience with underwater testing can be used in specific applications for measuring and identifying:

  • Noise and vibration
  • Cavitation caused by unsteady pressure
  • Dynamic pressure from waves

Highlights:

  • Waterproof, pressure tested cables can be over-molded directly to the sensor
  • ICP® voltage output or constant voltage line driver (CVLD) current output operates through long cables with low noise
  • Electrical case isolation for the lowest possible noise
  • Corrosion resistant construction

RAPIDLY FLUCTUATING PRESSURE, UNSTEADY FLOW,
CAVITATION & WAVE SLAP

Unsteady pressures must be measured and identified, including water flow and cavitation.

High Resolution ICP® Pressure Probe

Model S112A22

  • 100 mV/psi, 50 psi
  • Stainless steel

High Frequency CVLD Pressure Sensor

Model 113M231

  • 50 psi, 100 uA/psi
  • Emralon coated
  • Integral waterproof cable
  • Acceleration compensated
  • Ground isolated

VIBRATION

Shear mode accelerometers isolate the sensing crystals from the base and housing, lowering thermal transients and signal noise resulting from base bending effects. This is a very important feature when attaching them to relatively thin walled vessel hull models during wave slap applications.

ICP® Underwater Accelerometer

Model 352M221

  • 10 mV/g, ±500 g
  • 2nd order LP filter
  • Frequency response from 1 Hz to 10 kHz
  • Integral waterproof cable

Miniature Ring-style, Ceramic Shear CVLD Accelerometer

Model 355M87A

  • 100 μA/g, ±50 g
  • Frequency response from 7 Hz to 9 kHz
  • Integral waterproof cable
  • Case isolated

Miniature Ring-style, Ceramic Shear ICP® Accelerometer

Model 355M73

  • 100 mV/g, ±50 g range
  • Frequency response 7 Hz to 10 kHz
  • Integral waterproof cable
  • Case isolated

Teardrop ICP® Accelerometer With Flexible, Integral Cable

Model 352A74

  • 100 mV/g, ±50 g range
  • Frequency response 1 Hz to 8 kHz
  • Hermetic housing

Precision Quartz Industrial ICP® Accelerometer

Model 624B11

  • 100 mV/g, ±50 g range
  • Frequency response 0.8 Hz to 10 kHz
  • Integral waterproof cable
  • Case isolated

The Swiveler® Low Cost Industrial ICP® Accelerometer

Model 607A11

  • 100 mV/g, ±50 g range
  • Frequency response from 0.5 Hz to 10 kHz
  • Integral waterproof cable
  • Patented 360º cable orientation
  • Case isolated

Ring-Style Seismic Shear CVLD Accelerometer

Model 631M21

  • 1000 μA/g, ±2.5 g range
  • Frequency response from 1 Hz to 4 kHz
  • Integral waterproof cable
  • Case isolated

FORCE

ICP® Quartz Force Rings

Model 202M44

  • ± 100 lbs. (0.4 kN)
  • Measures dynamic excitation or reaction forces
  • Integral waterproof cable

UNDERWATER BLAST

Piezoelectric pressure sensors also measure shock waves and bubble energy associated with underwater explosion testing. Sensors structured with volumetrically sensitive, omnidirectional tourmaline crystal and ICP® microelectronics provide a high frequency, low impedance output in underwater test environments. Waterproof cables of customer requested lengths are factory installed.

Tourmaline ICP® Underwater Blast Sensor

Series 138A

  • ICP® underwater blast pressure probes
  • Ranges from 1000 to 50k psi (6894 to 344,740 kPa)
  • Rise time 1.5 μ sec
  • Resonant frequency ≥ 1 MHz