TEMPERATURE MEASUREMENTS USING SMALL QUANTITIES OF CERIUM MAGNESIUM NITRATE

Journal Article · Wed Apr 01 04:00:00 EST 1964 · Rev. Sci. Instr.

DOI:https://doi.org/10.1063/1.1718842· OSTI ID:4031724

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

A study is 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 a commercial version of the electronic bridge originally proposed by Pillinger, Jastram, and Daunt STARev. Sci. Instr. 29, 159 (1958)!. A discussion of the effects of spurious magnetic materials, of nearby paramagnetic salts, and of the vacuum jacket is given. 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. It may be concluded that if solid air can be kept away from the coils, the long term instabilities for a 1-g thermometer lead to errors of about 0.004 deg K/sup - 1/ in 1/T. A comparison between ballistic and 17-cps bridge measurements down to 0.015 deg K showed that 1/T* as determined by the two methods was the same with an error of less than 0.1%. (auth)

• Research Organization: Univ. of Illinois, Urbana
• NSA Number: NSA-18-018159
• OSTI ID: 4031724
• Journal Information: Rev. Sci. Instr., Journal Name: Rev. Sci. Instr. Vol. Vol: 35
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

AIR
BRIDGE CIRCUITS
CERIUM NITRATES
CIRCUITS
COILS
CRYOGENICS
EFFICIENCY
ERRORS
FREQUENCY
INDUCTION
INSTRUMENTATION
MAGNESIUM NITRATES
MAGNETIC MATERIALS
MAGNETISM
MEASURED VALUES
PARAMAGNETISM
SALTS
SOLIDS
STABILITY
THERMOMETERS
VACUUM