Prism refractometry and certain goniometrical requirements for precision

Tilton, Leroy W.

doi:10.6028/jres.002.030

Cited by 21 publications

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“…The angle of incidence, c, which satisfies the minimum deflection criterion is given by: C/2(8min ) (2) To maximize accuracy, we use an iterative procedure. Assuming the actual prism angle, , has been previously determined using the autocollimating telescope and the goniometer arm, we first rotate the prism to the approximate position for minimum deflection.…”

Section: Fraunhofers Methodsmentioning

confidence: 99%

<title>Goniometer-spectrometer for index of refraction measurements from the near UV through the near IR</title>

Ulbrich

Trede

1990

SPIE Proceedings

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The Möl I erWede Goni ometer-Spectrometer Model 2 is a medi urn-high accuracy instrument for the determination of prism angles and index of refraction in the visible wavelength range (400-700nrn), With its automatic Heidenhain rotary encoder, the instrument is capab'e of absolute accuracy to I ,O arcsec for prism angle measurements, and i x I 05 for index of refraction measurements. Recently, we have developed a modified version of this instrument to provide absolute index of refraction measurements in the wavelength range from the UV through the near IR (254nm-2325 nm). The absolute accuracy for index of refraction measurements in the range isThe classical methods of Rudberg and Fraünhoer are still the most accurate means of determining the absolute index oT refraction or bulk optical materials. Both methods utilize a collimator and telescope pair which are both focused at inflnity. The former is normally flxed, and the latter is mounted on a goniometer arm equipped with a precision graduated circle to provide absolute angular position of the telescope. The collimator is used to project the slit image o various spectral lines through a prism made from the material to be tested Usually, spectral lamps are used for the light sources, but lasers have also been used. The telescope and the sample prism are each rotated about the vertical axis of the goniometer so that each is set at the proper angle to produce a minimum angle of deflection of the projected slit image with the desired wavelength. The goniometer arm and telescope are then fine-adjusted so that the slit image 32 / SPIE Vol. 1327 Properties and Characteristics of Optical Glass II (1990) Downloaded From: http://proceedings.spiedigitallibrary.org/ on 10/09/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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Section: Fraunhofers Methodsmentioning

confidence: 99%

<title>Goniometer-spectrometer for index of refraction measurements from the near UV through the near IR</title>

Ulbrich

Trede

1990

SPIE Proceedings

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“…The prism table, equipped with tangent screw and elamp, rotates on a vertical axis completely independent of the axis of rotation of the telescope. A removable table consisting of two slides that travel in superimposed ways at right angles to each other was constructed and mounted on the prism table to facilitate the proper centering of the prism with respect to the collimator and telescop e [16,17].…”

Section: Pressure Apparatusmentioning

confidence: 99%

Optical and volumetric relaxation effects in glass following removal of high hydrostatic pressures

Weir¹,

Spinner²,

Malitson³

et al. 1957

J. RES. NATL. BUR. STAN.

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Optical a nd ,·olllmC'tric relaxation s in glass we re st udied after compress ing specimens .f hours at \),000 atmospheres and 21 0 C. Following re l ea~e of pressure t he refractiv e index waR hi gher tha n the o ri gin a l val ue a nd decreased with ti m e, re covering its ini tia l valu e wiLhin 12 hour~. Optical-relaxation cun·es for lead and borosilicate glasses ,\·e re complcx, the dcLailed behavior depend in g on composition and the r mal histo ry. No corresponding effects we rp obsel"\·ed in fURed silica after expo~ure to even higher pressures. Volumetric cllanges associated wit h index changes were dC'lermi ned i nterfcrometricall.v and fOll nd to be less than correspo ndin g changp, known to [lccompall!· annpaling. Pos~ible implicat ions of the results are d iscllssc'd.

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“…The results of this test are shown in figure 5. The maximum value of 4.2 sec is uncomfortably large, but as is more or less well known [9], the effect of positional error of the circle markings upon measurements can be sati'lfactorily minimized in the average, provided a systematic program of observations uEing proper orientations of the circle is followed .…”

Section: 1 Watts Spectrometermentioning

confidence: 99%

“…:\t1 easurements at each of the three temperatures failed to demonstrate any temperature dependen ce of the refracting angle. In order to minimize torsional errors of the cone, the procedure recommended by Tilton [9] was followed , one-half the measurements being made on the angle itself and the others on its explem ent. 4 The difference between the average of these two sets of data was observed to be n egligible on bo th sp ectrometers at 22° C and 27° C but amounted to about 1.5 sec on the Gaertner instrumen t at the lower t emperature.…”

mentioning

confidence: 99%

Refractivity of potassium bromide for visible wavelengths

Spindler¹,

Rodney²

1952

J. RES. NATL. BUR. STAN.

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Values of t he index of refraction of potassium bromid e were determined ind ependentl y on t wo high-precis ion spectrometers by the m ethod of minimum deviation for 11 spectral Jin es at te mperat ures neal' 17°, 24°, and 27° C. The instrumen ts are d escribed , and the m ethod s used in obtainin g res ults valid in the sixt h dccimal place of index are di sc ussed. T emperat ure coefficients of index were dctcrmined , and a small lineal' variation wa s found " 'it h respect to wavelength [lp. With t he values of dn/dt so obtained, the experimental dat a were red uced to a common temperatur(', averaged , and a four-co nstant K etteler-Helmholtz di~pe rs ion equat ion fi tted to the da ta and adjusted by least squares. The refractive indices of potassium bromide for t he particular prism used are intermediate between t he values reported by Harting [2] and Forrest [3]. R edu ced to 23° C for co mparison , t he results for sodium light arc Harting, 1.55983 ; National Bureau of Standard s, 1.55978 ; and Forrest, 1.55971. Another pris m m easured at NBS y ield ed 1.55983, and an obviously defective p ri sm gave 1.55889. Smal l differences in di spersio n " 'ere also detected .

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Prism refractometry and certain goniometrical requirements for precision

Cited by 21 publications

References 0 publications

<title>Goniometer-spectrometer for index of refraction measurements from the near UV through the near IR</title>

<title>Goniometer-spectrometer for index of refraction measurements from the near UV through the near IR</title>

Optical and volumetric relaxation effects in glass following removal of high hydrostatic pressures

Refractivity of potassium bromide for visible wavelengths

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