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Physical Measurement Laboratory / Sensor Science Division

Temperature & Humidity Group

Projects/Programs

Displaying 1 - 7 of 7
Acoustic Thermometer

Acoustic Thermometry

Completed
By measuring the speed of sound in argon gas, we have determined thermodynamic temperature with unprecedented accuracy in the range 0 °C to 552 °C. Our results
prototype system

Fixed Point Development : Non-Metals

Ongoing
We are developing new fixed points and new maintenance systems for use with Standard Platinum Resistance Thermometers (SPRTs) below the triple point of water
GH_gascollectionsys

Humidity

Ongoing
The NIST Thermodynamic Metrology Group maintains and develops national standards of humidity (in the range 1 nmol/mol to 0.6 mol/mol of water concentration)

Humidity Calibration Services at NIST

Ongoing
Humidity calibrations at NIST are performed using its state-of-the art primary standard humidity generator. Calibrations are performed on instruments that
NIST Shielded Room

Johnson Noise Thermometry

Completed
Johnson noise thermometry (JNT) is a primary temperature measurement technique based on the fundamental properties of thermal fluctuations in conductors. We
triple point cell

Thermometry

Ongoing
The NIST Thermodynamic Metrology Group maintains and develops national standards of temperature (in the range 0.65 K to 2011 K), and supports calibration of all