SU659894A1

SU659894A1 - Device for measuring the shape and deformation of thin-wall transparent objects

Info

Publication number: SU659894A1
Application number: SU742042469A
Authority: SU
Inventors: Юрий Константинович Щербаков
Original assignee: Московское Ордена Ленина И Ордена Трудового Красного Знамени Высшее Техническое Училище Имени Н.Э.Баумана
Priority date: 1974-07-05
Filing date: 1974-07-05
Publication date: 1979-04-30

Description

1one

Изобретение относитс к оптическим методам исследовани деформаций и может быть использовано при испытании тонкостенных элементов конструкций на статические и динамические нагрузки.The invention relates to optical methods for studying deformations and can be used when testing thin-walled structural elements for static and dynamic loads.

Известно устройство дл измерени формы и деформаций тонкостенных прозрачных объектов, содержащее коллимированный источник света, узел нагружени объекта и наблюдательную систему, фиксирующую отраженное от поверхности объекта излучение 1.A device is known for measuring the shape and deformations of thin-walled transparent objects, comprising a collimated light source, an object loading unit, and an observation system that detects radiation 1 reflected from the object surface.

Недостатком известного устройства вл етс его невысока точность, поскольку изменение направлени отраженного излучени , св занное с формой и деформаци ми объекта, фиксируетс по интенсивности света, прощедшего через входной зрачок наблюдательной системы.A disadvantage of the known device is its low accuracy, since a change in the direction of the reflected radiation, associated with the shape and deformations of the object, is detected by the intensity of the light that has passed through the entrance pupil of the observation system.

Наиболее близким по технической сущности к предложенному техническому решению вл етс устройство дл измерени формы и деформаций тонкостенных прозрачных объектов, содержащее цилиндрический экран с центральным отверстием и нанесенными на нем вдоль образующей полосами линейного растра, фотоаппарат.The closest in technical terms to the proposed technical solution is a device for measuring the shape and deformations of thin-walled transparent objects, comprising a cylindrical screen with a central hole and a camera attached to the forming stripes of a linear raster on it.

размещенный за отверстием экрана, и узел нагружени объекта 2.placed behind the screen opening, and the loading unit of the object 2.

Недостатком данного устройства вл етс невысока скорость обработки картины муаровых полос, определ ема тем, что дл повышени скорости обработки необходим визуальный контроль формы и деформаций объекта.The disadvantage of this device is the low processing speed of the pattern of moire stripes, which is determined by the fact that to increase the processing speed, visual control of the shape and deformation of the object is necessary.

Целью насто щего изобретени вл етс повышение быстродействи устройства.The purpose of the present invention is to increase the speed of the device.

Это достигаетс тем, что оно снабжено дополнительным экраном, выполненным аналогично первому и размещенным на оптической оси устройства симметрично относительно плоскости, перпендикул рной оптической оси и проход п1,ей через место закреплени объекта в узле нагруЛСени .This is achieved by the fact that it is provided with an additional screen, made similar to the first one and placed on the optical axis of the device symmetrically with respect to the plane perpendicular to the optical axis and passage n1, through the fixing point of the object in the loading unit.

Суть изобретени по сн етс чертежом,The invention is illustrated in the drawing.

где на фиг. 1 представлена схема устройства; на фиг. 2 - вид по стрелке А на фиг. 1.where in FIG. 1 shows a diagram of the device; in fig. 2 is a view along arrow A in FIG. one.

Claims

The device contains identical cylindrical screens I and 2 located on the same optical axis, with linear raster stripes applied along them, cameras 3 placed behind the hole in the center of screens 1 and 2 and unit 4 loading the object 5. Screens 1 and 2 are placed symmetrically relative to the plane perpendicular to the optical axis of the device and passing through the fixing point of the object 5 in the loading unit 4. The screens are moved and rotated by the spindle screws 6 and 7 and the rotary device 8. The device operates as follows in a way. The image of the linear screen of screen 1 when reflected from the front surface of a transparent thin-walled object 5 falls on the camera 3 of screen 1. The image of the linear screen of screen 2 after passing through object 5 also falls on the input of the same camera. This creates a picture of moire strips, which determine the shape and deformations of object 5. The camera 3, located behind the hole in the center of the screen 2, allows you to control the shape and deformations of the back surface of the object 5. The presence of an additional screen allows you to visually control the shape and deformation of the object, which allows to increase the processing speed of the pattern of moire stripes. 6598 5 10 15 20 25 4 The formula of the invention A device for measuring the shape and deformation of thin-walled transparent objects, containing a cylindrical screen with a central hole and printed on it along the forming strips of a linear raster, a camera placed behind the screen hole, and the object loading unit, that, in order to increase its speed, it is equipped with an additional screen, made similar to the first one and placed on the optical axis of the device symmetrically with respect to the plane, perpendicular to optical axis and passing through the location of the object in the loaded fixing node. Sources of information taken into account during the examination 1. Theocaris P. Moire bands in the study of deformations. M., “Peace, 1972, p. 217-221.

2. Sukharev I.P., Ushakov B.N. Investigations of the des () of formations and stresses by the method of moirés. M., “Mechanical Engineering, 1969, p. 60-69.

FIG. one