Cryogenic Radiometer Electronic Control System Combined Tender

• Country: USA
• Summary: Cryogenic Radiometer Electronic Control System Combined Sources Soughtnotice of Intent to Sole Source
• UST Ref No: 138501946
• Deadline: 08 Apr 2026
• Financier: Self Financed
• Purchaser Ownership: Government
• Tender Value: Refer Document
• Notice Type: Tender
• Document Ref. No.: NIST-SS26-94
• Purchaser's Detail:
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• Description:
• ***THIS IS A COMBINED SOURCES SOUGHT NOTICE AND NOTICE OF INTENT TO SOLE SOURCE***
  The National Institute of Standards and Technology (NIST), The NIST critical mission includes establishing and disseminating the SI units through physical measurement standards. For optical power measurements, the NIST Primary Optical Watt Radiometer (POWR) serves as the Nation-s standard. POWR performs low-noise optical power calibrations using an instrument called an absolute cryogenic radiometer (ACR), a type of primary optical standard detector which allows optical power measurements to be traced directly to calibrated electrical power. The control electronics for these devices are rather specialized, requiring two low-noise temperature control circuits monitored by alternating current (AC) resistance bridges.
  The purpose of this acquisition is to procure a modern, commercial-off-the-shelf control electronics system to replace an outdated system for the POWR absolute cryogenic radiometer (ACR). The new system must provide high-precision temperature control and accurate electrical substitution power measurements to prevent system failure and improve data collection efficiency through modern interfaces and control algorithms.
  NIST is seeking information from sources that may be capable of providing a solution that will achieve the objectives described above, in addition to the following essential requirements:
  General requirements of all components:
  Should include two independent, low-noise 4-wire AC resistance bridges with automatic phase compensation for the POWR ACR receiver and heat sink:
  usable with resistive sensors (Germanium Resistance Thermometers) from 10 Ω to 100 kΩ
  sensor excitation frequency should be in the range from 100 Hz to 500 Hz
  excitation currents from 200 nA to 1 mA
  
  Two independent electrical substation heater outputs (one for the heat sink and one for the receiver):
  for temperature adjustment, control, and measuremen...
• Documents:

 Tender Notice