RU2372604C1 - Self-contained system for collecting information on fatigue changes in structures - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: device is a self-contained system for collecting information on fatigue changes in structures and has a device for picking up data, optically connected to the analysed object, and an image analysing system, which is a computer. The device for picking up data is portable and includes a sensor unit, a control unit, a memory module, an imaging module and a module for connection to the computer. The sensor unit includes a self-contained light source, a unit for adjusting light, unit for adjusting image sharpness, a prism system which is placed in such a way that, the analysed surface is illuminated perpendicular to it, a lens system which is designed for obtaining a magnified image of the analysed object, and a self-contained power supply.

EFFECT: increased accuracy of obtaining information, increased information content of results, reduced labour input.

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Description

The invention relates to a measurement technique and can be used to collect information about fatigue structural changes from strain gauges of an integral type (hereinafter referred to as DDIT).

The principle of operation of DDIT is that the structure of the sensor material undergoes changes under the action of cyclic deformations and a reaction in the form of “dark spots” occurs on its surface. The moment of appearance of the first "dark spots", as well as their density and size, correlate with the number of cycles and the amplitude of cyclic deformations. Details of DDIT are given in patent 2209412 C2, G01N 3/32, publ. 07/27/2003.

A device is known "Optoelectronic fiber guide" (OSB) (Syzrantsev VN, Golofast SL. Measurement of cyclic deformations and prediction of the durability of parts according to the readings of strain gauges of the integral type. Novosibirsk: Nauka, 2004. - S.38-45). The principle of operation of this device is to measure the reflection coefficient of the DDIT surface. This is done by recording the changes in the infrared radiation flux reflected from the surface of the DDIT.

The disadvantage of this device is the complete exclusion from the measurement process of visual observation of the effect on the sensor, as a result of which an uncontrolled spread of the measurement data is possible due to external factors such as dust particles, poor-quality washing of the DDIT surface before measurement, orientation of the constituent elements of the devices.

A device is known "Autonomous biochemical digital optical complex", RU 2006101898A, S12M 1/00, publ. 07/27/2007, including a transparent measuring cell, a measuring unit containing a microscope optically coupled to a measuring cell, and an image analysis system optically coupled to the microscope and containing a computer.

The disadvantage of this device is the lack of an autonomous source of uniform scattered light. In addition, to obtain reliable information about fatigue changes with DDIT, it is necessary that light be incident perpendicular to its surface.

The task to which the claimed technical solution is directed is to develop an autonomous complex that allows collecting data from DDIT with the possibility of visual control of obtaining results and having high accuracy of data collection by providing illumination of the investigated surface with the necessary intensity and uniformity, and reducing the influence of interference.

In the implementation of the invention, the task is solved by achieving a technical result, which consists in increasing the accuracy and information content when receiving information from DDIT due to the fact that when using this complex of information retrieval, the influence of factors such as the presence or absence of stationary lighting of the object of study, defects surface, as well as the human factor (subjective image assessment).

The indicated technical result is achieved in that an autonomous complex for collecting information about fatigue structural changes, comprising a device for data collection connected optically to the object under study and an image analysis system provided by an electronic computer, is designed so that the device for data collection is portable and includes includes a sensor unit having optical communication with the object under study, a control unit, a memory module, a visualization module, and a communication module with electronic computing an automatic machine, in this case, the sensor unit includes an autonomous light source, a light leveling unit, designed to obtain uniform scattered light, an image clarity control unit, a prism system located so that the illumination of the surface under investigation occurs perpendicular to it, a lens system designed to obtain an enlarged image of the investigated object, and an autonomous power source.

Reducing the influence of the presence or absence of stationary lighting is achieved through the use of its own autonomous light source, a light alignment unit that provides uniform diffused light, and a system of optical prisms that make it possible to illuminate the surface under investigation perpendicular to it. Reducing the effect of defects of the investigated surface on the result is achieved due to the possibility of visual control using the visualization unit obtained using the sensor image element of the surface, enlarged using a lens system and corrected by the image clarity adjustment unit. The influence of the human factor (subjective image assessment) is reduced due to the automation of the measurement process performed by the control unit.

Figure 1 presents a block diagram of the proposed autonomous complex.

Figure 2 is a block diagram of a sensor unit.

The proposed autonomous complex includes a portable device for collecting data 2, which is in optical communication with DDIT, mounted on the studied object 1, and associated with the image analysis system provided by an electronic computer 3, which can be used as a personal computer, laptop or pocket personal computer. A portable device for collecting data 2 consists of a sensor unit (SB) 4, which can be used, for example, the matrix of a digital camera, control unit (BU) 5, which can be used as a microprocessor module, communication module (MS) 6 , memory module 7, visualization module 8. Under the studied object 1 is understood a structure on which at least one DDIT is fixed and which fatigue changes are to be obtained. As the communication module 6 can be used both wired and wireless means of pairing, for example a Wi-Fi transceiver. The visualization module 8 may be represented by a liquid crystal display.

In turn, the sensor unit 4 consists of a sensor element 9, a prism system 10, a lens system 11 consisting of at least two lenses, a light alignment unit 12, a light source 13, and an image clarity adjustment unit 14. The light source 13 is connected optically through the unit aligning the light 12 with a system of prisms 10, which, in turn, has an optical connection with the lens system 11 and the sensor element 9. The light aligning unit 12 is designed to obtain uniform scattered light, and the lens system 11 to obtain an enlarged image the object under study. The image clarity control unit 14 is in electrical communication with the control unit 5 and in mechanical communication with the lens system 11. By mechanical communication is meant the ability to move the lenses inside the lens system 11 relative to each other in order to change the focal length.

The principle of the complex:

DDIT, mounted directly on the test object 1, is connected optically to the sensor unit 4. Moreover, the sensor unit 4 is constructed in such a way that the light from the light source 13, passing through the light alignment unit 12, the prism system 10 and the lens system 11, falls on the surface of the DDIT perpendicularly, and the reflected light, also passing through the prism system 10 and the lens system 11, is perceived by the sensor element 9, placed parallel to the surface of the DDIT, and converted into electrical form, thus obtaining a frontal enlarged image of erhnosti. Next, the electrical signal is read from the sensor element 9 by the control unit 5, converted into digital form and stored in the memory module 7. The control unit 5 performs the initial data processing and displays the result using the visualization module 8. If the result meets the requirements, transmission information through the communication module 6 on the computer 3 for further processing.

Thus, the claimed complex allows the collection and primary processing of data from DDIT, on the basis of which the assessment and calculation of fatigue structural changes is carried out.

Claims (1)

An autonomous complex for collecting information on fatigue structural changes, comprising at least one integral type deformation sensor mounted on the surface under investigation and optically coupled to a data acquisition device, and an image analysis system provided by an electronic computer, characterized in that the device for data acquisition is portable and includes a sensor unit, a control unit that converts the electrical signal of the sensor unit into a digital form stored in the module mint, and performing primary data processing, the result of which is displayed in the visualization module, the communication module of the control unit with an electronic computer and an autonomous power source, while the sensor unit includes an autonomous light source connected optically through a light alignment unit, designed to obtain uniform scattered light, with a prism system optically coupled to a lens system and a sensor element arranged parallel to the surface of the strain gauge, as well as an adjustment unit ki-definition images having electrical connection with operating and mechanical connection with the lens system unit, wherein the prism system is arranged so that the investigated surface lighting is perpendicular thereto.

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