Attachment 2 - Specifications.pdf
PDF 102 KB Posted
- Attached to
- Nuclear Magnetic Resonance (NMR) System Federal contract opportunity
- Solicitation number
- 12805B23Q0883
About this file
This document outlines specifications for a surface nuclear magnetic resonance instrument being procured by the USDA Agricultural Research Service. The system must be capable of providing high-quality subsurface profiles to depths of at least 50 meters, be relatively compact and transportable to allow for multiple readings in a single day, support long-term monitoring projects, and withstand weather conditions in California's Central Valley. Operationally, the system must be deployable and operable by a two-person crew without specialized equipment and support various loop and pulse sequence configurations. Instrumentally, the system must output at least 2000V and 400A, provide dead-times under one millisecond, incorporate at least one reference coil channel, have a capacitance over 60 mF, include pulse tuning technology, and come with data processing and inversion software. Sufficient electrical cabling to set up two 100-meter diameter loops separated by cable is also required.
The related federal contract opportunity is solicitation number 12805B23Q0883 for a nuclear magnetic resonance system issued by the USDA Agricultural Research Service Field Research Implementation and Information Delivery Plains Area.
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Other files for this federal contract opportunity
| File | Type | Posted |
|---|---|---|
| Clauses and Provisions - 12805B23Q0883.pdf | ||
| Attachment 1 - Pricing Schedule.xlsx | XLSX spreadsheet |
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Text version
Minimum Requirements and Specifications
Surface nuclear magnetic sounding instrument
Background:
The USDA-ARS Sustainable Agricultural Water Systems unit uses a range of geophysical techniques to monitor managed aquifer recharge operations. Nuclear magnetic resonance (NMR) systems are uniquely capable of imaging the water content in the subsurface, offering a high degree of utility for our groundwater mapping and monitoring efforts. NMR systems operate by energizing hydrogen protons in groundwater using a tuned, oscillating electromagnetic pulse and then measuring the time-decaying signal as the protons relax to their equilibrium state. Since the signal strength is proportional to the number of energized protons, we can infer the water content in the subsurface from our signal strength.
In the case of surface NMR systems, the signals are very weak (on the order of nanovolts), so the system needs to be engineered to provide a range of noise-suppression methods including figure-eight loops, reference coils and internal filters. Furthermore, the system needs to be able to emit a range of different types of pulses, in order to better energize the subsurface.
Ultimately, we need a system that is:
• Capable of providing high-quality, high resolution subsurface profiles to depths >=50 meters
• Relatively compact and transportable so multiple soundings can be acquired in a single day
• Capable of supporting long-term monitoring projects
• Sufficiently rugged to handle most weather conditions seen in California’s Central Valley, particularly high temperature conditions.
Operational Specifications
1. The system must be operable by a two-person crew of reasonable physical fitness (able to carry 50 lbs) without the need for specialized equipment to transport the system.
2. The system must be capable of deployment in a range of configurations, from small loops for pre-polarization measurements to large-loops for deeper investigations, as well as figure-eight loops for more robust noise cancellation.
3. The system must be able to support a range of pulse sequences, including FID, Spin-echo and CPMG, and adiabatic pulses.
4. The system must incorporate standard high-voltage safety features, including automatic shutdown protocols and environmentally rated connectors.
Instrument Specifications:
1. The system must be able to output at least 2000V and 400A.
2. The system must be able to provide dead-times of less than one millisecond.
3. The system must support at least one reference coil channel.
4. The system must have a capacitance of at least 60 mF.
5. The system must incorporate pulse tuning technology.
6. The system must come with data processing and inversion software for field data visualization.
7. Enough electrical cable must be provided to set up two 100 meter diameter, single-turn loops (one measurement loop, one reference loop) with enough cable to keep the loops sufficiently separated
File details come from the government source that posted it. Updated .