Johnson infraBSU Infrasound Sensor Responses

infraBSU Sensitivity and Low-frequency Corner

The infraBSU uses a MEMS analog differential transducer whose sensitivity within the passband is measured using hydrostatic pressure:

MEMS water level Sensitivity
0.5 inches 46 microV/Pa
1.0 inches 23 microV/Pa
5.0 inches 9.1 microV/Pa

This instrument also includes a color-coded capillary attachment that determines the low-frequency corner of the passband:

Color Capillary diameter Corner frequency
Pink 25 microns 0.016 Hz
White 50 microns 0.031 Hz
Yellow 50 microns 0.035 Hz
Blue 62.5 microns 0.048 Hz

Manufacturer Model Frequency / Period Sensitivity RESP Filename Source Comments
Johnson infraBSU 0.016 Hz / 64.5 s 0.000046 V/Pa RESP.XX.IS011..BDF.INFRABSU.0_016.0_000046 Johnson
Johnson infraBSU 0.016 Hz / 64.5 s 0.000023 V/Pa RESP.XX.IS012..BDF.INFRABSU.0_016.0_000023 Johnson
Johnson infraBSU 0.016 Hz / 64.5 s 0.0000091 V/Pa RESP.XX.IS013..BDF.INFRABSU.0_016.0_0000091 Johnson
Johnson infraBSU 0.031 Hz / 32.5 s 0.000046 V/Pa RESP.XX.IS014..BDF.INFRABSU.0_031.0_000046 Johnson
Johnson infraBSU 0.031 Hz / 32.5 s 0.000023 V/Pa RESP.XX.IS015..BDF.INFRABSU.0_031.0_000023 Johnson
Johnson infraBSU 0.031 Hz / 32.5 s 0.0000091 V/Pa RESP.XX.IS016..BDF.INFRABSU.0_031.0_0000091 Johnson
Johnson infraBSU 0.035 Hz / 29 s 0.000046 V/Pa RESP.XX.IS017..BDF.INFRABSU.0_035.0_000046 Johnson
Johnson infraBSU 0.035 Hz / 29 s 0.000023 V/Pa RESP.XX.IS018..BDF.INFRABSU.0_035.0_000023 Johnson
Johnson infraBSU 0.035 Hz / 29 s 0.0000091 V/Pa RESP.XX.IS019..BDF.INFRABSU.0_035.0_0000091 Johnson
Johnson infraBSU 0.048 Hz / 21 s 0.000046 V/Pa RESP.XX.IS020..BDF.INFRABSU.0_048.0_000046 Johnson
Johnson infraBSU 0.048 Hz / 21 s 0.000023 V/Pa RESP.XX.IS021..BDF.INFRABSU.0_048.0_000023 Johnson
Johnson infraBSU 0.048 Hz / 21 s 0.0000091 V/Pa RESP.XX.IS022..BDF.INFRABSU.0_048.0_0000091 Johnson

Mary Templeton 10/21/2019