SU127839A1 - Method of measuring logarithm of light flux ratio - Google Patents

Method of measuring logarithm of light flux ratio

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Publication number
SU127839A1
SU127839A1 SU639406A SU639406A SU127839A1 SU 127839 A1 SU127839 A1 SU 127839A1 SU 639406 A SU639406 A SU 639406A SU 639406 A SU639406 A SU 639406A SU 127839 A1 SU127839 A1 SU 127839A1
Authority
SU
USSR - Soviet Union
Prior art keywords
logarithm
measuring
light flux
photodiodes
flux ratio
Prior art date
Application number
SU639406A
Other languages
Russian (ru)
Inventor
К.М. Кролевец
В.С. Янович
Original Assignee
К.М. Кролевец
В.С. Янович
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by К.М. Кролевец, В.С. Янович filed Critical К.М. Кролевец
Priority to SU639406A priority Critical patent/SU127839A1/en
Application granted granted Critical
Publication of SU127839A1 publication Critical patent/SU127839A1/en

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Description

Известны способы измерени  логарифма отношени  величин световых потоков с помощью двух полупроводниковых фотоднодов линейного усилител  логарифмирующей схемы и коммутирующих устройств. Недостатки подобных способов состо т в их сложности, низкой стабильности и сильном вли нии на результаты измерений дестабилизирующих факторов.Methods are known for measuring the logarithm of the ratio of the magnitudes of light fluxes using two semiconductor photo-diodes of a linear amplifier of a logarithmic circuit and switching devices. The disadvantages of such methods are their complexity, low stability and a strong influence on the measurement results of destabilizing factors.

В описываемом сиособе эти недостатки устранеиы введением в одну из ветвей схемы, образованиой двум  встречно включенными фотодиодами , посто нного тока смещени  в провод щем направлении, что дает Еозможность логарифм отношени  величин световых потоков определ ть непосредственно по напр жению на фотодиодах.In the described method, these shortcomings are eliminated by introducing a direct current bias in one of the circuits, formed by two oppositely connected photodiodes, in a conducting direction, which gives Etostvo logarithm of the ratio of light fluxes to be determined directly by the voltage on the photodiodes.

Схема включени  фотодиодов, по сн юща  описываемый способ, изображена на чертеже.The photodiode switching circuit, explaining the described method, is shown in the drawing.

Два встречно включенных фотодиода / и 2 освещаютс  предварительно промодулированными сравниваемыми световыми потоками. В одну из ветЕ.ей этой схемы через сонротивление 3 ввод т посто нный ток смепдени  в провод щем направлении. Величину посто нного тока смещени  регулируют таким образом, чтобы свести к нулю разницу между переменными фото-э.д.с. фотодиодов / и 2, освещенных сравниваемыми световыми потоками. При этом посто нное напр жение на фотодиодах / и 2 будет пропорционально логарифму отношени  величин световых потоков. Величину этого напр жени  измер ют милливольтл етром посто нного тока, подключаемым к 4 и 5.Two counterdiode photodiodes / and 2 are illuminated with previously modulated compared fluxes. A constant mixing current in the conductive direction is introduced into one of the circuits of this circuit through resonance 3. The magnitude of the DC bias current is adjusted in such a way as to reduce to zero the difference between the photo-emf variables. photodiodes / and 2, illuminated by the compared light fluxes. In this case, the constant voltage on the photodiodes / and 2 will be proportional to the logarithm of the ratio of the magnitudes of the light fluxes. The magnitude of this voltage is measured by a millivolt of a direct current motor connected to 4 and 5.

Предмет изобретени Subject invention

Способ измерени  логарифма отношени  величин световых потоков с помощьюПолупроводниковых фотодиодов, от л и ч а юи и и с   тем, что, с целью повышени  стабильности, исключени  вли ни  на результаты измерений внешних факторов и упрощени  процесса измерени , зThe method of measuring the logarithm of the ratio of the magnitudes of the light fluxes using semiconductor photodiodes, from l and h and y and so that, in order to increase stability, eliminate the influence on the results of measurements of external factors and simplify the measurement process,

одну из ветвей схемы, образованной ДЕ.ум  встречно включенными фотодиодами , вводитс  посто нный ток смещени  в провод щем направлении и регулируемый таким, образом, чтобы свасти к нулю разницу между переменными фото-э.д.с. фотодиодов, освещенных сравниваемыми световыми потоками, при этом посто нное напр жение на фотодиодах будет пронорционально логарифму отношени  Е.еличин св.етовЕзгх. потоков..One of the branches of the circuit formed by the DC-opposite photodiodes is fed with a constant bias current in the conductive direction and regulated in such a way as to reduce to zero the difference between the photoelectric variables. photodiodes, illuminated by the compared light fluxes, while the constant voltage on the photodiodes will be proportional to the logarithm of the ratio E.elichin St.Eggs. flows ..

fi---2Lfi --- 2L

5Z5Z

SU639406A 1959-09-21 1959-09-21 Method of measuring logarithm of light flux ratio SU127839A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SU639406A SU127839A1 (en) 1959-09-21 1959-09-21 Method of measuring logarithm of light flux ratio

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU639406A SU127839A1 (en) 1959-09-21 1959-09-21 Method of measuring logarithm of light flux ratio

Publications (1)

Publication Number Publication Date
SU127839A1 true SU127839A1 (en) 1959-11-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
SU639406A SU127839A1 (en) 1959-09-21 1959-09-21 Method of measuring logarithm of light flux ratio

Country Status (1)

Country Link
SU (1) SU127839A1 (en)

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