Required_Specifications_1.pdf
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- Attached to
- infrasound acoustic monitors
- Solicitation number
- 140G0326Q0133
About this file
This document contains technical specifications for infrasound acoustic monitoring sensors required by the USGS Volcano Science Center for volcano monitoring purposes. The sensors must be delivered by September 30, 2026, and must be existing products currently in production with established performance histories; units modified or developed solely to meet these requirements are unacceptable.
The specified sensors must meet strict technical parameters including nominal sensitivity of 0.0275V/Pa@1Hz or greater, a full-scale range of 720Pa peak-to-peak or greater, and differential output with a maximum signal output of 20VPP. Operational requirements include flat frequency response within ±3dB from 0.02Hz to 240Hz or wider, band-limited self-noise of 5mPa RMS from 0.05 to 200Hz or less, and dynamic range of 110dB or greater. Power requirements specify a DC supply range of 11.5V to 18V or wider with reverse polarity protection and current consumption of 150mW or less. Physical characteristics require a maximum diameter of 4 inches, maximum height of 3.5 inches, minimum of three acoustic entry points, operating temperature range of -40°C to +65°C, and 90% or greater humidity tolerance. Individual sensor calibration must be within ±5% of acceptable nominal values with calibration traceability to a nationally accredited external laboratory calibration chamber.
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Technical Specifications for Acoustic Monitoring Sensor
The USGS Volcano Science Center (VSC) requires infrasound acoustic monitors for the purposes of volcano monitoring. These sensors must meet the following specifications:
Deliver:
• Must be delivered by September 30, 2026
General:
- Individual sensor calibration must be within +-5% of acceptable nominal values
- Nominal calibration values must be traceable to a nationally accredited external laboratory calibration chamber and shown to meet requirements
- Sensor must be in current production and have an established, proven, and acceptable performance history o This acquisition is directed at existing products only, not at product design and development o Units that have been modified or developed solely to meet the requirements of this acquisition are not acceptable
Signal Characteristics:
- Nominal Sensitivity: .0275V/Pa@1Hz or greater
- Full Scale Range: 720Pa peak to peak full scale input range or greater
Sensor Output Specifications:
- Output type: Differential
- Maximum signal output: 20VPP
Operational frequency band and self-noise
- Frequency response: Flat to within +-3dB from .02Hz to 240Hz or wider band
- Band-limited Self Noise: 5mPa RMS from 0.05 to 200Hz or less
- Dynamic Range: 110dB or greater
Power requirements:
- DC supply range: 11.5V to 18V or wider with reverse polarity protection
- DC current consumption: 150mW or less
Physical Characteristics:
- 4” diameter or smaller
- 3.5” tall or shorter
- Acoustic entry points: minimum of three
- Operating temperature: -40C to +65C
- Humidity tolerance: 90% or greater immunity to humidity
- Housing must be of corrosion resistant material(s) that are isolated from ground.
| Technical Specifications for Acoustic Monitoring Sensor |
| General: |
| Signal Characteristics: |
| Sensor Output Specifications: |
| Operational frequency band and self-noise |
| Power requirements: |
| Physical Characteristics: |
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