Piezoelectric Transducer
Small size, light weight
High output, high capacitance
Sensitivity change less than 1 dB
with depth (to 200,500, or 1000 feet)
Acceleration cancelling balanced
crystal configuration
Hydrocarbon resistant polyurethane case
with optional aluminum cover
Ideal for geotechnical
environmental studies
The MP-18 is a small, piezoelectric crystal transducer for use in shallow borehole studies and VSP applications. The MP-18 has high output and high capacitance, and negligible change of sensitivity with depth. Maximum working depths are from 200 to 1000 feet. Operating temperature is from 0 - 35 deg. C.
The MP-18 has an acceleration cancelling, balanced crystal configuration. The crystals are in a molded polyurethane case, with an optional protective aluminum cover.
MP-18-200 MP-18-500 MP-18-1000
Nominal Capacitance } 20% : 17,000 Picofarads
Voltage Sensitivity } 1.5 dB : 42 Volts/Bar(MP-18-2000), 28 Volts/Bar (MP-18-500), 14.5 Volts/Bar (MP-18-1000)
Charge Sensitivity : 714,000 pC/bar (MP-18-200), 476,000 pC/bar (MP-18-500), 210,250 pC/bar (MP-18-1000)
Maximum Working Depth (Sensitivity change < 1 dB) : 200 ft (MP-18-200), 500 ft (MP-18-500), 1000 ft (MP-18-1000)
Frequency Response } 1 dB (into 22 Megohm load): 8-1000 Hz
Operating Temperature Range : 0-35C
Dimensions :
Length: 2.03 in (5.16 cm)
Width: 2.00 in (5.08 cm)
Thickness: 0.21 in (0.53 cm)
Volume: 6.05 cubic centimeters
Weight: .52 lbs (236 g)
Basic Unit 9.85 g
With Optional Cover: 16.62 g