Spectrophotometer Linearity Testing Using the Double-Aperture Method

Mielenz, Klaus D.; Eckerle, K. L.

doi:10.1364/ao.11.002294

Cited by 83 publications

(48 citation statements)

References 5 publications

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“…Admittedly these are the extreme cases. For some ideas on how to evaluate the possible errors in linearity measurements due to coherence, see Born and Wolf [15], Mielenz and Eckerle [16], and Bures and Delisle [17].…”

Section: N+n2•mentioning

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 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: N+n2•mentioning

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 transmittance measured for three and four filters was found to be: [7,8] 10 mm by 18 mm in the center of the 50.8 mm diameter port. This allows for the complete return of the reflected signal from within most nearly opaque samples without losses caused by the port edge being too close to the area of illumination.…”

Section: Wavelengthmentioning

confidence: 95%

“…The values for Qv are used in eq. (4) The linearity of the detector and electronic system was determined by using the lightaddition method with a double-aperture apparatus [4,10], that is, the output of the detector system when irradiated by two light beams simultaneously is compared to the sum of the outputs obtained when the detector is irradiated by each light beam separately. Measurements were also made of the signal as a function of time.…”

Section: Reflectance Measurement Proceduresmentioning

confidence: 99%

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Optical radiation measurements:

Hsia¹,

Venable²,

Weidner³

1976

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The spectrophotometer consists of a broadband monochromator with optional bandpasses of 2, 5, 10, and 20 nanometers.The exit aperture of the monochromator is provided with special mirror optics to collimate and switch the beam for optional use as a reference or sample beam. These collimated beams are directed into a dark room where a variety of sample mounts, light gathering devices, and detectors can be installed. Measurements for which provisions have been made or are being planned include directionalhemispherical reflectance as a function of angle of incidence, diffuse transmittance, haze, and bidirectional reflectance factor.This Technical Note describes the design of the instrument in detail, and gives the results of the performance tests and detailed error analyses which have been carried out to date.

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“…Since the linearity is, within 1 part in 1()4, not usually a function of wavelength [36], all measurements were performed at A 565.0 nm. A recent study of this parameter at NBS by Mielenz and Eckerle indicates that there may be a relation between wavelength and linearity at the level of 1 part in 1 (» [38].…”

Section: Linearity Controlmentioning

confidence: 98%

An accurate spectrophotometer for measuring the transmittance of solid and liquid materials

Mavrodineanu

1972

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

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The opti cal trans mittance of solids and liquids as well as the molar absorptivity of vari ous chemical species are parameters of fundam eQtal signifi can ce in characterizing these material s. Meaningful transmittance data can be obtained only when the me asurements are performed with well-known accuracy and precision. To perform such measurements, a high accuracy spectrophotometer was designed and assembl ed at NBS , Analytic al Che mi stry Division, and will be described in this paper. This singlebea m in strument is composed of a constant radiation source, a monochromator, a sample carriage, an integrating sph ere-ph otomultiplier asse mbly followed by appropriate electroni cs, and a read out syste m consistin g of a di gital voltm eter and a computer data acqui sition and handling provision. The acc uracy of tra nsmittance measurements is determined by the light-addition principle used in conjunction with a two-aperture arrangement. The spectrophotomete r can be used in manual or automatic modes of ope ration_ A d etailed di sc ussion of the data obtained with thi s instrument, used in both modes, will be prese nted together with its applicati on to th e ce rtification of solid and liquid S tandard Reference Materials for ch ecking the photometric scal es of conventional spectrophotometers.

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Spectrophotometer Linearity Testing Using the Double-Aperture Method

Cited by 83 publications

References 5 publications

Accurate measurements of and corrections for nonlinearities in radiometers

Accurate measurements of and corrections for nonlinearities in radiometers

Optical radiation measurements:

An accurate spectrophotometer for measuring the transmittance of solid and liquid materials

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