A Photoelectric Colorimeter with Logarithmic Response*

Müller, Ralph H.; Kinney, Gilbert Ford

doi:10.1364/josa.25.000342

Cited by 16 publications

(4 citation statements)

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“…The measuring circuit consists of the photronic cell, PC, a switch, and two shunting resistors for the microammeter M, which provide for coarse and fine adjustment of the meter reading. Under conditions of low external resistance, the current from the photocell is strictly proportional to the light intensity (3). (Since we desire the complete elimination of arbitrary, empirical relationships, this method is preferred to balanced cell arrangements and other schemes which have been proposed, which may be very sensitive and suited to the problem in hand, but cannot add anything fundamental to precise colorimetry.…”

Section: Photoelectric Colorimetersmentioning

confidence: 99%

Photoelectric Colorimetry in Microanalysis

Müller¹

1935

Ind. Eng. Chem. Anal. Ed.

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Photoelectric methods afford precise means for investigating colorimetric reactions. Most of the methods are in the range of microanalysis. The highest precision is undoubtedly afforded by the vacuum photoelectric cell-amplifier method. Barrier-layer cells are precise but considerably simpler. Either method can be made to yield data of fundamental importance.light Jo incident on both cups, containing solutions of concen-

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Section: Photoelectric Colorimetersmentioning

confidence: 99%

Photoelectric Colorimetry in Microanalysis

Müller¹

1935

Ind. Eng. Chem. Anal. Ed.

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“…[34][35][36] (2) by a device for continuous variation of intensity, such as movable photo-cells or lamp,4. 5.…”

Section: Introductionmentioning

confidence: 99%

A Compensating Circuit for Blocking-Layer Photoelectric Cells

Brice

1937

Review of Scientific Instruments

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A compensating circuit comprisi~g two blocking-layer photoelectric cells in a parallel connection with a galvanometer and potentiometer-rheostat is described. Analysis of the circuit shows that a uniform scale attached to the potentiometer-rheostat may be used to indicate transmission (or reflectance) of light by a sample if the resistance of the potentiometer and the series internal resistances of the photoelectric cells are small in comparison with the

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“…Cystine can be determined colorimetrically by reduction to cysteine and by using reagents which form colors in the presence of free sulfhydryl groups (2,9). Cystine can also be determined polarographically, and studies of this type have been reported (7).…”

Section: Accuracy and Precisionmentioning

confidence: 99%