Procedures for precise determination of thermal radiation properties, November 1963 to October 1964

Richmond, Joseph C.; Dunn, S. Thomas; DeWitt, D P.; Hayes, Warren D

doi:10.6028/nbs.tn.267

Cited by 3 publications

(3 citation statements)

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“…Preliminary results, using a 2 -inch-diameter sphere mounted over the detector, with a white velvet diffusing paint coating (MMM), indicated that this approach seemed feasible, at least at short wavelengths where known diffusers are available [22]. It is known from the theory of integrating spheres [23] that for sphere efficiency to be high, it is necessary for (1) the wall reflectance to be close to unity, (2) the diameter of the sphere to be a minimum, and (3) the area of the entrance and exit ports to be a minimum.…”

Section: Averaging Spheresmentioning

confidence: 99%

Thermal radiation property measurement techniques

Dunn¹

1967

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Section: Averaging Spheresmentioning

confidence: 99%

Thermal radiation property measurement techniques

Dunn¹

1967

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“…Ash-A" (13) The ass umption of uniform radian ce over the small solid angle s ubte nd ed by As" is more reaso nable and accurate than th e ass umpti on of uniform radiance over a he mi s ph e re made by pre viou s inves ti gators.…”

Section: Analysis Of the Emrmentioning

confidence: 99%

“…However, because of serious detector problems [13] and general secondary priority of the work , progress was slow, and the desired res ults were not achieved until late in 1964.…”

Section: Design Of the Ellipsoidal Mirror Reflectometermentioning

confidence: 99%

Ellipsoidal mirror reflectometer

Dunn¹,

Richmond²,

Wiebelt³

1966

J. RES. NATL. BUR. STAN. SECT. C. ENG. INSTR.

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A new e llip soidal mirror re Aec to me te r is d esc rib ed, in whi c h radi a nt Au x from a n infrared mo noc hro lll a t (>I-is fo c use d on a specimen placed a t th e firs t foca l po int of th e ell ip so id a nd a th e rm o pil e d e tec tor is pla cet! at th e seco nd. Errors assoc iat ed with a n gul ar a nd a rea l variation s in se ns iti vity of th e det ector a nd wi th aberra ti o ns in th e opt ics we re largely e limin a te d thro ugh use of a s ma ll ave ragin g s ph e re pl aced ove r th e d e tector. Losses ca used by th e presc nce of th e e nt ra nee ho le in th c el lipsoidal m ir ror a nd frolll mirror abso rption we re e va lu a ted both th eoreti ca ll y a nd ex pe rim e nt a ll y. Co rrecti o ns for th ese losses pe rmitt ed abso lute re Acc ta nce to be o btain ed for bo th d iffu se and parti a ll y diffu se re Aec tin g s pecim e ns. In additi on, th e uniqu e op ti cs of th e e lli pso id a l mirro r provid e more ve rsa tilit y th an is ava il able in Ilrcv iou s re Hec to me te rs. Thi s ve rsa tilit y in c lu d es th e ab ilit y to acc ura te ly meas ure direc ti o na l-he mi s p he ri ca l, s pec ul ar, nons llec ular , and direc ti o na l-a nnul a r co ne re Aec tan ce. An a nal ys is of the acc uracy of th e in s trum e nt indi ca tes th a t an acc uracy of be tt e r th a n one pe r ce nt is poss ibl e fo r a ll e ng in ee rin g materia ls. Th e li se of th e s ulfur ave rag in g s ph e re a lso allowed the cons tru c ti o n of a s impl e acc u ra te s pec ul a r re Aec tome te r for ca li bration of th e mirror re fe re nce stand a rd s use d in th ese meas urement s.Key Words : Avera gin g sp heres, bidirect ional re fl ec t ali ce, diffu se re fl ec tance , e llipso ida l re Aee to me te r, infrared, infra re d det ec tors , re Hec tan ce . re Aee tollle te r, s pat ia l se ns itivit y, s pec tral refle c ta nce, spee ular re Aec tanc e.

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Theory, Estimation, and Measurement

Touloukian¹,

DeWitt²

1970

Thermal Radiative Properties

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Procedures for precise determination of thermal radiation properties, November 1963 to October 1964

Cited by 3 publications

References 0 publications

Thermal radiation property measurement techniques

Thermal radiation property measurement techniques

Ellipsoidal mirror reflectometer

Theory, Estimation, and Measurement

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