KR20000053759A - Potable Nondestructive and Noncontact Optical Measurement System - Google Patents

Abstract

PURPOSE: A portable non-destructive non-contact optical measuring instrument is provided to promote convenience in use and move for an user as well as to measure transformation or defect data of an object in a non-destructive non-contact method. CONSTITUTION: Rays of light are induced from a optical induction cable(100) and divided into two by an optical distributor(200). Straight rays of the two are diffused primarily through a mirror(220') and an optical diffusion lens(230'), then diffused secondarily through a concave mirror and radiated to an object. The other rays are distributed secondarily through a mirror(220) and an optical distributor(200'), and a phase change data is inputted to a computer from a mirror(300). On measuring displacement in a surface, the rays are measured in its amount by an optical detector(320) while the other one is radiated to the object through the mirror(220'), the optical diffusion lens(230') and the concave mirror. On measuring displacement out of the surface, the rays of the third optical distributor(200') are diffused through a needle hole of an optical diffuser(310). All of the rays are combined each other and transmitted to a CCD(charge coupled device) camera(330). An image thereof is stored in the computer.

Description

Portable Non-Destructive Non-Contact Photometer {Potable Nondestructive and Noncontact Optical Measurement System}

TECHNICAL FIELD The present invention relates to a photometer, and more particularly, to a portable non-destructive non-contact photometer as a method of detecting the degree of deformation or a defect of an object and obtaining a more accurate result and moving it.

Current trends in science and technology development are largely classified into miniaturization and high precision, and require equipment with user convenience. Equipment for this purpose is continuously developed. Radiography, magnetic particle inspection, penetration inspection, etc., can cause fatal damage to the human body or the object without careful attention, and to determine the degree of defects and deformations in the pressure vessel or composite. The detection method can be performed by conventional inspection methods, but it can be applied to fine pores and cracks in the reactor pressure vessel, to delamination, which is a phenomenon in which the composite used in the fuselage or wing of the aircraft is broken into thin pieces, and to the impact of a soft object such as a bird. There is a difficulty in the detection of the degree of damage and the like, and the accuracy of the measurement is also limited in millimeters. For this reason, a method using laser light has been developed. According to US Pat. No. 5,920,017, a method of measuring residual stress using a flow temperature indicating coating has been developed. This method can easily visualize the residual stress of the object, but this method has the disadvantage of coating the object. In addition, according to US Pat. No. 5,419,405, a method of analyzing vibration characteristics of an object using a pulse laser has been developed, which can accurately measure vibration characteristics, but an expensive pulse laser must be used. Therefore, there is a need for a non-contact method that can be used to measure the degree of deformation of an object with a high precision in micrometers and can be easily understood by a user using a continuous laser. .

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above problems, and its object is to carry out non-destructive contactless measurement of deformation information or defect information of an object, and to allow a user to use and move a non-destructive contactless light. To provide a meter.

According to the characteristics of the present invention, as a method of using photons, it uses coherence, straightness, and the like among various characteristics of the laser, and furthermore, the development of computer technology enables real-time processing of the image, which enables real-time output of the result in the field. Do. A light guide cable and a cable anchor for guiding light from the laser; An optical separator for distributing the light into the object light and the reference light; A light diffuser for diffusing light; A concave mirror mounting arm for direct irradiation while diffusing light onto the object; A camera with a lens for receiving displacement information of the object light and the reference light; A portable non-destructive non-contact photometer is provided that includes a control unit for adjusting the photographing of the camera.

1 is a perspective view showing a portable non-destructive non-contact photometer of the present invention

Figure 2 is a plan view of the light diffusion concave mirror and the arm of the present invention

3 is a block diagram of a measuring device, an image processing device, and a phase shift control device;

<Explanation of symbols for the main parts of the drawings>

100: light guide cable 110: light guide cable fixing device

120: input / output terminal and cable 120 ': input / output terminal and cable

200: polarization function optical splitter 200 ': polarization function optical splitter

210: optical coupler 220: mirror

220 ': Mirror 230: Lens for light diffusion

230 ': Light diffusion lens 240: Reflected light receiving window

300: piezoelectric element mirror 310: light diffuser

320: light detector 330: CD camera

400: light irradiation direction adjustment screw 410: light diffusion concave mirror

420: arm for external bonding

Hereinafter, the portable non-destructive non-contact photometer of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing a portable non-destructive non-contact photometer of the present invention,

2 is a plan view of a light diffusion concave mirror and an arm, which is an essential part of the present invention.

As shown, the portable non-wavelength non-contact photometer according to the embodiment of the present invention includes a light guide cable 100 through which laser light is guided, a light guide cable fixing device 110 that couples the light guide cable to the exterior, and guidance. A light splitter (200, 200 ') for distributing the laser light, a mirror (220) (220') for reflecting the distributed light, and a light diffusion lens (230) for diffusing the light reflected from the mirror ( 230 '), a light diffusion concave mirror 410 for second-diffusion of the diffused light, a light irradiation direction adjusting screw 400 for adjusting the irradiation direction of the diffused tube, and a concave mirror 410 to the main body. An arm 420 to be fixed, a piezoelectric element mirror 300 for adjusting a change in the phase of the laser light, a light diffuser 310 for diffusing light inside the body during out-of-plane displacement measurement, and a light detector for detecting the amount of laser light And an image of the light coupled by the optical coupler 210 through the reflected light receiving window 240. It consists of a CD camera 330, the light diffusing concave mirror 410 is irradiated with light to the non-destructive and non-destructive contact information of the object without damaging the object to reflect the light receiving window 240 Through this, the image formed in the CD camera 330 is configured to be obtained in real time through image processing.

The optical induction cable 100 is fixed to the main body by the optical induction cable fixing device 110, optical distributors 200, 200 'and mirrors 220, 220', light diffusion lens 230 ( 230 ') is fixed to coincide with the height and center of the light induction cable 100, the piezoelectric element mirror 300 and the photodetector 320 is fixed so that the center of the light receiving unit coincides with the center of the light, the light diffuser 310 Is configured to be exactly matched to the center so that light passes through the needle hole, the light diffusion concave mirror 410 attached to the arm 420 is fixed to the main body can be adjusted by the light irradiation direction adjustment screw 400 Reflected light receiving window 240 that is received by reflecting light to the object is made of a transparent material that does not reduce the amount of reflected light and is adhered to the main body to prevent the penetration of dust and foreign objects, the image by the received light CD camera 330 to form an image is placed in the external vibration To consist.

The portable non-wavelength non-contact photometer of the present invention configured as described above has the following functions. The light guided by the light guide cable 100 is distributed in two in the optical splitter 200, and the light traveling straight through the light split in two is first diffused through the mirror 220 'and the light diffusion lens 230'. Secondary diffusion through the light diffusion concave mirror 410 is irradiated to the object. The other of the light divided into two is secondly distributed through the mirror 220 and the optical splitter 200 'and the information about the phase change in the piezoelectric element mirror 300 to the computer through the input / output cable and the terminal 120'. The other split light measures the amount of light from the photodetector 320 through the tertiary light splitter in the in-plane displacement measurement, and the other is the mirror 220 ', the light diffusing lens 230' and the light diffusing concave. The object is irradiated through the mirror 410. When measuring the out-of-plane displacement, the light passes through the third optical splitter 200 'and the light diffuses through the needle hole of the light diffuser 310 through the fourth splitter 200' and the optical combiner through the mirror 220 '. Inputted at 210. Both in-plane displacement information and out-of-plane displacement information are received by the CD camera 330 in the state in which light is combined, and an image formed by the image is stored in the computer.

EXAMPLE

FIG. 5 shows the strain of the welded part during the mechanical behavior of the butt welded part as shown in FIG. 4 by the portable non-destructive non-contact photometer of the present invention, and the stripes of FIG. 7 and 8 show the results of the mechanical behavior analysis of the bolt fastening as shown in Figure 6 by the present invention in a quantified three-dimensional strain graph, Figure 7 shows the quantified three-dimensional strain of Figure 6 and Figure 8 shows the strain Synthesize and show real photos before distribution.

By directly using the photon of the present invention, it is excellent in coherence, straightness, and focusing properties, so that it can be applied to an object in a harsh environment such as ultra high temperature, ultra low temperature, high humidity, radiation, high voltage, high current, etc. Soft objects that cannot be measured can also be measured. In addition, with the development of computer technology and the improvement of image processing technique, the measurement results can be output in real time in the field. In addition, no preprocessing is required for inspection or measurement, and the output of the test results is displayed as an image so that non-experts can easily understand the results. The precision of the inspection result can be measured in micro units, and unlike the method of partially measuring the object and using the entire area, the entire object area can be measured and measured simultaneously. In addition, the inspection measurement was performed by contacting the object without the need for post-processing on the object itself.

These portable non-contact, non-destructive photometers have a wide range of applications throughout the industry of metrology. It can be used to improve the quality of products on the manufacturing line of electronic products, to measure and predict the life of structures such as steel bridges and steel towers, to analyze the deformation of machine tools and to diagnose safety.

In addition, the shape of the manufactured prototype is measured and compared with the prototype product, and used for quality inspection of new products in the production process line of the product, enabling efficient use of time and economic human resources in the production of the product. It is possible to construct a measurement system that can be used by non-experts because of its simple processing, and to operate a constant safety diagnosis monitoring system for large structures (bridges, steel towers). Currently, application measurement technology using laser is combined with laser processing technology, which greatly improves the reliability of joining and cutting compared to conventional methods, and improves component analysis of new materials and defect detection of products composed of composite materials. To facilitate new technological innovations in the field of production.

Claims (3)

Irradiating the illumination light to the object, input the reflected light generated on the surface of the object by the illumination light through the light receiving window 240, the basic information by the first input image before the deformation of the object and the second input after the deformation of the object Using a pair of light diffusing lenses 230 and 230 'and a light diffusing concave mirror 410 capable of measuring in-plane displacement information as a method of detecting displacement information of an object by comparing and arranging images, out-of-plane Portable non-destructive non-contact photometer, which uses an internal light diffuser 310 capable of measuring displacement information and incorporates the use of a piezoelectric element mirror 300 and a mirror 220 'to detect defects. The portable non-destructive non-contact photometer according to claim 1, wherein a light diffusing adjustment screw (400) for adjusting the direction of the light diffusing concave mirror (410) is used as a method of irradiating illumination light onto the object. The portable non-destructive non-contact photometer according to claim 1, wherein a light diffusing lens is used as a method of measuring in-plane displacement information to replace illumination light of the object.