SU974113A1

SU974113A1 - Polarimeter

Info

Publication number: SU974113A1
Application number: SU813278497A
Authority: SU
Inventors: Александр Иванович Лебедев; Александр Евгеньевич Макаров; Георгий Дмитриевич Федоровский
Original assignee: Ленинградский Ордена Ленина И Ордена Трудового Красного Знамени Государственный Университет Им.А.А.Жданова
Priority date: 1981-04-20
Filing date: 1981-04-20
Publication date: 1982-11-15

Description

(54; ПОЛЯРИМЕТР(54; POLARIMETER

Изобретение относитс к измерительной технике, а более конкретно к измерению напр жений оптическими методами.The invention relates to a measurement technique, and more specifically to the measurement of stresses by optical methods.

Известно устройство дл измерени напр жений содержащее источник излучени и расположенные по ходу светового пучка пол ризатор, компенсатор и анализатор flj.A device for measuring stresses contains a polarizer, a compensator, and an analyzer flj located along the light beam.

Недостатком этого ус гройства вл етс низка скорость измерений,так : как необходимо измер ть значение вектора пол ризации в нескольких точках.The disadvantage of this arrangement is a low measurement rate, since it is necessary to measure the value of the polarization vector at several points.

Наиболее близким по технической сущности к изобретению вл етс пол риметр/содержащий источник светового излучени и расположенные п6 ходу светового пучка коллиматор, пол ризатор , фазовую пластинку, отражающий элемент, вторую фазовую пластинку, анализатор и телевизионную систему 2,The closest to the technical essence of the invention is a polarimeter / containing a source of light radiation and a collimator, a polarizer, a phase plate, a reflecting element, a second phase plate, an analyzer and a television system 2, which are located on the course of the light beam,

Основными недостатками этого устройства вл ютс низка точность, обусловленна изменением вектора пол ризиции при прохождении световым пучком оптических элементов устройства , и отсутсвие элементов, позвол ющих автоматизировать процесс измерений .The main disadvantages of this device are low accuracy due to a change in the polarization vector when the light beam passes through the optical elements of the device, and the lack of elements allowing automation of the measurement process.

Цель изобретени - повышение точ:ности измерений путем коррекции вектора пол ризации дополнительными фазовыми пластинками.The purpose of the invention is to improve the measurement accuracy by correcting the polarization vector with additional phase plates.

Поставленна цель достигаетс тем, что пол риметр, содержащий источник светового излучени и расположенные по ходу светового пучка коллиматор,по10 л ризатор фазовую пластинку,отражающий элемент,вторую фазовую пластинку ,ананизатор и телевизионную систему, снабжен модул тором светового пучка, двум дополнительными фозовыми пластин15 ками, двум светоделител ми и фотоприемником , модул тор светового пучка расположен между коллиматором и пол ризатором, одна дополнительна фазова пластинка расположена между The goal is achieved by the fact that a polarimeter containing a light source and a collimator located along the light beam, polarizer phase plate, reflecting element, second phase plate, analyzer and television system, are equipped with a light beam modulator, two additional photo plates15 kami , two beam splitters and a photoreceiver, a light beam modulator is located between the collimator and a polarizer, one additional phase plate is located between

20 пол ризатором и первой фазовой пластинкой , друга между второй фазовой пластинкой и анализатором, один светоделитель расположен между первой и второй фазовыми пластинками, второй 25 между анализатором и телевизионной системой, а фотоприемник установлен по ходу .светового пучка, отраженного от светоделител .A polarizer and the first phase plate, the other between the second phase plate and the analyzer, one beam splitter are located between the first and second phase plates, the second 25 between the analyzer and the television system, and the photodetector is mounted along the light beam reflected from the beam splitter.

На чертеже приведена оптическа The drawing shows the optical

Claims

30 floor plan of the rimeter. The field meter consists of a source of light 1 and located along the light beam of the collimator 2, light beam modulator 3, polarizer 4, additional phase plate 5, phase plate b, beam splitter 7, reflecting element Bf of the second phase plate 9, second additional phase plastics 10, analyzer 11 / second beam splitter 12, television system 13 installed in the beam, passing through the beam splitter 12, photodetector 14 with registration circuit 15, mechanisms 16 and 17 of polarizer 4 turning, analyzer 11 and phases O plates 5b, 9 and 10. The calorimeter Paul works as follows. The light radiation from the light source 1 is modulated by the modulator 3 and, using the collimator 2, is formed into a parallel beam of a given aperture. A polarizer 4 installed along the light beam provides flat polarization of the light radiation, and two successively installed phase plates 5 and G, which can rotate relative to each other, provide any given polarization state (for example, ellipse or flat). Next, the light beam passes through the beam splitter 7, onto the reflecting element 8, which is glued on or applied to object 18 and, reflecting from it the back surface, again hits the beam splitter 7, and then two phase plates 9 and 10, which return a flat beam to the beam polarization. After that, the light beam passes through the analyzer 11 which can be rotated with respect to the polarizer by means of the mechanism 16, the beam splitter 12 is directed to the television system 13 and the photodetector 14, if there is a defect or when the mechanical level is exceeded their photodetector voltages 14 register the change in light emission using the detection circuit 15, and measure the size and nature of the defect using a television system 13. The background light compensation is done by rotating the phase plates 5, 6, 9 and 10 relative to each other by a turning mechanism 17. The use of this polarimeter permits the investigation of the stress state and flaw detection remotely and improves the accuracy of stress determination by compensating for background radiation caused by optical electrons. with a floor meter. A polarimeter comprising a light source and a collimator, a polarizer, a phase plate, a reflecting element, a second phase plate, an analyzer and a television system located along the light beam, characterized in that, in order to improve the accuracy of the determination of voltages, it is equipped light beam modulator, two additional phase plates, two beam splitters and a photodetector, the light beam modulator is located between the collimator and the polarizer, one additional phase a plate is disposed between the polarizer and the first phase plate, the other - between the second phase plate and analyzer, a beam splitter located between the first and second phase plates, the other - between the analyzer and the television system, and a photodetector mounted downstream of the light beam reflected from the beamsplitter. Sources of information taken into account in exertiz 1. The author's certificate of the USSR 268723, cl. GOI On 11/16, 1970.

2. Tatarinov AS, Tarasov Yu.N., Ulnov B.A. Investigation of stresses in structures by the method of photoelastic coatings using television systems. Proceedings of the All-Union Conference on the method of photoelasticity. Tallinn, “v.2, p. 170-172 Sprotiotype).

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