 |
MP-18
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 Specifications |
| |
MP-18-200 |
MP-18-500 |
MP-18-1000 |
| Nominal Capacitance ± 20% |
—————17,000 Picofarads
————— |
| Voltage Sensitivity ± 1.5 dB |
42
Volts/Bar |
28
Volts/Bar |
14.5
Volts/Bar |
| Charge Sensitivity |
714,000
pC/bar |
476,000
pC/bar |
210,250
pC/bar |
| Maximum Working Depth (Sensitivity change < 1
dB) |
200
ft |
500
ft |
1000
ft |
| Frequency Response ± 1 dB (into 22 Megohm
load) |
—————8-1000 Hz
————— |
| Operating Temperature Range |
—————0-35°C
————— |
| 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 |
|
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