Instruments | Deep-Sea Differential Pressure Gauges (DPGs)
The Marine EM Lab serves as a facility for the design, construction
and calibration of deep-sea differential pressure gauges (Cox
et al., 1984).
DPG sensors are capable of accurate measurements of pressures generated directly
by long surface gravity waves, tsunami, and microseisms.
For more information contact: Jacques
Lemire, jlemire@ucsd.edu.
Click the reference below to download a PDF document of the original
DPG publication:
Charles Cox, Thomas Deaton,
and Spahr Webb. A Deep-Sea Differential Pressure Gauge. Journal of Atmospheric
and Oceanic Technology: Vol. 1, No. 3, pp. 237–246, 1984. (PDF, 688
KB)
DPG Specifications
| Pass Band |
2 Hz to 500 seconds |
| Nominal Gain |
1 mV/Pa at 1 Hz |
| Noise |
5 x 10-3 Pa2 / Hz at 100 seconds |
| Dimensions |
152.5 mm diameter x 200 mm long, not including connector. |
| Internal Media |
dimethylpolysiloxane (silicone oil), UV sensitive |
| Weight in air |
5 kg |
| Weight in seawater |
1.5 kg at 15°C |
| Operating Temperature |
-2 to +35°C |
| Depth Rating |
6000 m |
| Operation Orientation |
any |
| Hardware Options |
Metric or US |
| Connector |
4 pin Impulse or custom |
Photographs of the SIO DPGs
Below we show two photographs of the Scripps Institution of Oceanography differential
pressure gauge (DPG).
Noise Spectra of DPGs
The figure below shows the power spectral density (PSD),
noise spectrum and magnitude-squared coherence for two DPG data sets collected
in a temperature controlled vault at IGPP. 120 minutes of data were used.
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