TEMPERATURE MEASUREMENTS USING SMALL QUANTITIES OF CERIUM MAGNESIUM NITRATE

Technical Report · Tue Jan 01 04:00:00 EST 1963

OSTI ID:4689249

Abel, W R; Anderson, A C; Wheatley, J C

A study was made of the requirements of a mutual inductance system suitable for precise temperature measurements using about one gram of cerium magnesium nitrate. The mutual inductance is measured by an electronic bridge originally proposed by Pillinger, Jastram, and Daunt. The effects of spurious magnetic materials, of nearby paramagnetic salts, and of the vacuum jacket are discussed. The linearity and stability of the electronic bridge as well as the effects of external circuitry are also discussed. Results are given for the properties of two coil sets with cerium magnesium nitrate thermometers used to test the stability of the bridge and the validity of expressions for mutual inductance obtained in the test. It may be concluded that if solid air can be kept away from the coils the long term instabilities for a 1 gm thermometer lead to errors of about 0.004 deg K/dup -1/ in 1/T. A comparison between ballistic and 17 cps bridge measurements down to 0.015 deg K showed that 1/T1 as determined by the two methods was the same with an error of less than 0.1%. (auth)

• Research Organization: Illinois. Univ., Urbana
• NSA Number: NSA-17-041194
• OSTI ID: 4689249
• Report Number(s): TID-19533
• Country of Publication: United States
• Language: English

Related Subjects

BRIDGE CIRCUITS
CERIUM NITRATES
CIRCUITS
COILS
EFFICIENCY
ELECTRONICS
ERRORS
INDUCTION
INSTRUMENTS AND INSTRUMENTATION
MAGNESIUM NITRATES
MAGNETIC MATERIALS
MAGNETISM
MEASURED VALUES
PARAMAGNETISM
SALTS
STABILITY
TASTE
TEMPERATURE
THERMOMETERS
VACUUM