The NBS Photoelectric Pyrometer and its Use in realizing the International Practical Temperature Scale above 1063 °C

Lee, R D

doi:10.1088/0026-1394/2/4/004

Cited by 35 publications

(13 citation statements)

References 6 publications

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“…Null Method-Lee [29], in establishing the NBS pyrometric te mpe rature scale, used Erminy's method with three strip filament lamps to calibrate a fourth lamp at 14 c urre nts , so the radiances we re in the proportion 0.007812 : 0.015625 : 0.03125 : 0.0625 : 0.125 : 0.25 : 0.5: 0.67 : 1.0: 1.5 : 2.0: 3.0: 4.0 : 6.0. Using 1= P (Tr), where P (Tr) is a power fun ction of Tr , he found seven coefficie nts to fit the 14 radiance te mperatures Tr correspondin g to the 14 c urre nts.…”

Section: Measurement Of Radiant Fluxes To Testmentioning

confidence: 99%

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Accurate measurements of and corrections for nonlinearities in radiometers

Sanders¹

1972

J. RES. NATL. BUR. STAN. SECT. A.

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The methods desc ribed in the lite rature for acc urately meas urin g photocell linea rity are surveyed and assessed. The effect of not meas uring photocell linearity under th e condition s used in the final appa ratu s are cons idered. So me of the conditions necessa ry for accurate assess ment of the non· lin earity under working conditions are specifi ed. The use of the NRC " Photocell Lin earit y Teste r" to meas ure and correct for the nonlinea rity of various receiv ers is desc ribed.

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Section: Measurement Of Radiant Fluxes To Testmentioning

confidence: 99%

“…It tak es seco nd s for the lamp to sta bilize at eac h te mperature, but there may be some circumstan ces whe re this me thod should be used. The paper by Lee [29] describes the be haviour of strip filam e nt lamps. Vacuum lamps are more stable than gas filled lamps, provided th e temperature is kept low.…”

Section: Measurement Of Radiant Fluxes To Testmentioning

confidence: 99%

Accurate measurements of and corrections for nonlinearities in radiometers

Sanders¹

1972

J. RES. NATL. BUR. STAN. SECT. A.

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“…The photoelectric pyrometer is not a new innovation in temperature measurement, but only recently has it come of age as a precision piece of equipment. Since descriptions of this type of device are given elsewhere [11,12] , only pertinent details will be outlined here. Basically, the automatic pyrom· e ter operates on th e same general principle as the well-known visual optical pyrometer with a photo· tube performing the same function as the eye.…”

Section: 2mentioning

confidence: 99%

Effect of environment upon the melting point of Al2O3

Schneider

McDaniel

1967

J. RES. NATL. BUR. STAN. SECT. A.

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The me ltin g point of AI, O" has bee n d e termined in vac uum . a ir. a rgon. a nd he lium utilizin)': iridium or tun ),:s te n co ntain ers. A ll me ltin g po int expe rim e nt s we re conduc ted in indu c ti on furna ces capab le of hea ti ng s ma ll sa mpl es und er b lackbody co ndition s to 3000 °C in vacuum. 2600 °C in inert at mosp he res. a nd 2400 °C in air. Temperatures we re co ntinu ous ly mo nit o red wit h a reco rding phutoe lec tri c pyrome ter whi c h has a se n sitivity of±0.2° at 1063 °C and ± 10 at 2000 0c. Meltin g points were determ in ed on s pec im ens having a purity in excess of 99.9 pe rce nt. T he data indi c at e d that th e me ltin g poin t of AI ,O" d e te rmin ed in vac uum (-6.5 X 10 -5 torr) is 2051 °C OPTS). T he overa ll maximum un ce rt a int y was es tim ate d to be ± 6 0c. Th e mea s ure me nt s th e m se lves we re prec ise within ± 1.5 0c. Vacuum trea tm e nt had leas t de t rimenta l e ffec t upon th e AI,03 spec im e ns. Eac h of the gaseous a tmo s ph e res in c lu ding air yie lded lower me lti ng point s for AI,O", p res umably d ue to a premeltin g p he nom e no n.Key Word s : A I,O". di ss ocia tion. e nvironm e nt a l e ffec ts . me ltin g po int. prc mc ltin g:.

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“…(4) where R" is the spectral responsivity of the instrument and includes the spectral transmittance of the wavelength-limiting element (e.g., interference filter or monochromator), the spectral transmittance of all other optical elements, and the spectral responsivity of the detector. A determination of R" allows a calculation of T from eqs (2 and 4).…”

Section: Basic Theorymentioning

confidence: 99%

“…Photoelectric Pyrometer [4]. A new version of this instrument is under development, which will employ interference filters (1 nm bandpass) and refractive optics.…”

Section: Gas-filled Lampsmentioning

confidence: 99%

The NBS scale of radiance temperature

Waters¹,

Walker²,

Hattenburg³

1987

J. RES. NATL. BUR. STAN.

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This paper describes the measurement methods and instrumentation used in the realization and transfer of the International Practical Temperature Scale (lPTS-68) above the temperature of. freezing gold. The determination of the ratios of spectral radiance of tungsten-strip lamps to a gold-point blackbody at a wavelength of 654.6 nm is detailed. The response linearity, spectral responsivity, scattering error, and polarization properties of the instrumentation are described. The analysis of sources of error and estimates of uncertainty are presented. The assigned uncertainties (three standard deviations) in radiance temperature range from ±2 K at 2573 K to ±O.5 Kat 1073 K.

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The NBS Photoelectric Pyrometer and its Use in realizing the International Practical Temperature Scale above 1063 °C

Abstract: apportera un gain appreciable de pr&&ion, en &tendant qu,elle soit a son tour autre mBthode par exemple le comptage des franges d'inter-f6rence d'un laser, m6thode pour laquelle notre inter-

Cited by 35 publications

References 6 publications

Accurate measurements of and corrections for nonlinearities in radiometers

Accurate measurements of and corrections for nonlinearities in radiometers

Effect of environment upon the melting point of Al2O3

The NBS scale of radiance temperature

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