JP2019095320A - Flaw detector - Google Patents

Abstract

To enable a discharge tube to be effectively cooled with water in a nondestructive inspection by thermography.SOLUTION: Provided is a flaw detector comprising a heating device 3 equipped with a discharge tube 4 for heating the surface of a test object m by light emission and an image acquisition device 1 for making it possible to observe the movement of heat generated by heating inside the test object m, and designed to examine a defect of the test object m by observation, the heating device 3 including a trigger line 6 connected to a trigger electrode, the trigger line 6 performing a trigger discharge to induce a discharge of the discharge tube 4, wherein a cooling unit 8 causes a coolant to be moved on the outside of the discharge tube 4 and thereby cools the discharge tube 4 with water, and the trigger line 6 is arranged at a position where the water-cooling of the discharge tube 4 is not obstructed.SELECTED DRAWING: Figure 2

Description

The present invention relates to a flaw detection apparatus.

The surface of the test material, ie, the object to be inspected, is instantaneously heated by the discharge tube, and the movement of heat generated by the heating is visualized and observed by an infrared camera or the like, and defects such as scratches and density unevenness inside the test material. In recent years, nondestructive inspection by infrared thermography which detects defects and measures defects is being used.
In general, thermography refers to an image that analyzes infrared radiation emitted from an object and graphically represents a heat distribution.
The flaw detection method using infrared thermography does not require ultrasonic fluid such as water or oil as in the flaw detection method using ultrasonic waves, so it is necessary to perform flaw detection on a test material to which the media fluid does not want to be attached. In the manufacturing process of (1), the use is widely used when it is desired to quickly and easily conduct online flaw detection. For example, a flaw detection method using infrared thermography is attracting attention as an effective means for detecting defects of CFRP (carbon fiber reinforced plastic) as well as metal materials.

Specifically, in nondestructive inspection by infrared thermography, heat is applied to the surface to be inspected with a xenon lamp or the like, and the heat diffuses inside and detects a temporal change of the temperature of the surface which changes according to the internal condition. And analyze the internal condition of the inspection object.
When there is a defect inside the inspection object, the speed of heat flow propagating to the inside of the inspection object changes, so that a local temperature change occurs on the inspection object surface. By detecting this temperature change, it is possible to detect a defect occurring inside the flaw detection target.
Patent Document 1 shows an example of an infrared thermography flaw detection method and an apparatus therefor.

The apparatus disclosed in Patent Document 1 measures the temperature of the heated inspection object 01 using the temperature measurement means 03 such as an infrared camera together with the heating means 02, and acquires data indicating the relationship between time and temperature (Paragraph 0014 and FIG. 1). Then, by appropriately analyzing the acquired data using the computer into which the data analysis software 05 has been introduced and the display means 06 for result image display, defect detection is reliably performed (paragraphs 0015 to 0029).

In the above-mentioned non-destructive inspection by infrared thermography, the lamp energy by the irradiation of the xenon lamp applies thermal energy to the inspection object. The heat energy propagates into the substance. In the nondestructive inspection by the above-mentioned infrared thermography, since the inside of the inspection object is inspected by measuring the state of the propagation with the infrared camera, the heat energy heats the surface of the object as uniformly as possible. Is required.
On the premise of the above requirement, in the nondestructive inspection by the infrared thermography, the size, the intensity and the type of the light source are selected according to the size, the material and the time interval required for the inspection.
In non-destructive inspection by infrared thermography, one or more of the above-mentioned xenon lamps (xenon flash lamps) are used as a heating device, that is, a discharge tube which is a light source for normal heating.

The discharge tube serving as the light source can emit heat instantaneously to generate heat and heat the object to be inspected instantaneously, but the exhaustion is also intense due to the generated heat.
Specifically, for a discharge tube such as the xenon lamp, heating energy required in nondestructive inspection by infrared thermography is secured by light emission for a short time, and the light emission time interval is also short, Furthermore, when the inspection is carried out continuously for a long time, the heat dissipation of the lamp is extremely large, and it is necessary to cool the lamp for maintaining the performance of the lamp and protecting it.
Cooling of the discharge tube is generally performed by air cooling such as blowing air to the discharge tube with a fan or using a heat sink, including when using the discharge tube other than the heating device for nondestructive inspection by infrared thermography.
However, in the above non-destructive inspection by infrared thermography, as described above, a xenon lamp is used to perform light emission accompanied by a large amount of heat generation instantaneously and repeatedly. Therefore, a cooling means having a higher cooling capacity has been desired.
In fields other than nondestructive inspection, it is well known that xenon lamps are used as excitation light sources for YAG lasers. That is, in YAG laser oscillation, a xenon lamp is used as an excitation source. In particular, a YAG laser used for ophthalmologic treatment, skin treatment, etc., is required to have rapid light emission repetition and stable output, so a cooling method by water cooling is generally adopted.
In the YAG laser, unlike the nondestructive inspection described above, in which the light from the light source is diffused and irradiated to the object, the light is emitted in the optical fiber without emitting the xenon lamp in the closed space and diffusing it to the outside. The energy is applied to the laser material that emits the directing laser. In the above-described YAG laser, the lamp and the YAG rod of the laser are put together in the stored cooling water and immersed in water for cooling. In the YAG laser, a trigger voltage required for light emission of the lamp is applied with the housing of the transmitter as an electrode, and the entire inside of the housing is insulated from the outside of the housing.
The fundamental difference between the case of using the above-mentioned laser oscillation and the case of using it for nondestructive inspection regarding the xenon lamp is that the purpose of the laser is to irradiate light energy to the lasing material and concentrate the energy. On the other hand, in the case of nondestructive inspection, the purpose is to irradiate energy as uniformly as possible to the surface of the inspection object, and in the case of nondestructive inspection, therefore, the light of the lamp is opened and exposed to the outside as in the above. It differs from the case of the laser in that it emits
As for the irradiation distance, the laser is a close distance, but in the case of nondestructive inspection by infrared thermography, it is not limited to the close distance depending on the size of the inspection object and the like. Therefore, in nondestructive inspection by infrared thermography, the diffusion of heat from the discharge tube is greater than in the case of the above laser, and it is necessary to perform water cooling of the discharge tube more effectively.
In view of the above, the inventor of the present invention performs cooling by passing water using a water cooling pipe like a water cooling unit in a high pressure discharge lamp shown in Patent Document 2 as a water cooling method suitable for nondestructive inspection by infrared thermography We focused on water cooling.

Patent No. 5574261 JP, 2016-103413, A

A discharge tube such as the above-mentioned xenon lamp causes the enclosed gas to emit light from the discharge. In order to generate the discharge, a trigger that triggers the discharge is first required, and a trigger line for performing the trigger discharge needs to be disposed in the vicinity of the discharge tube.
Specifically, as shown in FIG. 1 of Patent Document 2, the water cooling unit 20 has a double structure including an inner pipe 21 and an outer pipe 22 formed cylindrically as a water cooling pipe. A discharge tube (discharge tube lamp 10) is accommodated in the internal space, and cooling water is passed between the inner tube 21 and the outer tube 22. In order to dispose the trigger wire (wire 14) in the vicinity of the discharge tube, a gap (space) through which the trigger wire passes is provided between the discharge tube and the inner tube 21.
Therefore, in the case of water cooling, a dedicated space for arranging the trigger wire of the above-mentioned gap is provided in the vicinity of the discharge tube, in particular, outside the diameter (direction) of the discharge tube. The tube lamp 10 is separated by the air layer accommodating the trigger line, and the cooling effect due to water flow is reduced.
The present invention solves the above problems and enables effective water cooling of a discharge tube in nondestructive inspection by thermography.

The present invention includes a heating device provided with a discharge tube that heats the surface of the test material by emitting light, and an image acquisition device capable of observing a change in heat inside the test material caused by the heating. In the observation, a defect in the test material is checked, and the heating device includes a trigger conductive unit connected to a trigger power source, and the trigger conductive unit generates a trigger voltage that induces discharge of the light emission of the discharge tube. Regarding the flaw detection apparatus to be supplied, one having the following configuration could be provided.
That is, the heating device includes a cooling unit that cools the discharge tube, and the cooling unit water-cools the discharge tube by moving a cooling liquid outside the diameter of the discharge tube. The trigger conductive portion is disposed at a position not disturbing the water cooling with respect to the discharge tube.
Investigating defects in the test material means checking whether or not the test material is in a desired state, or how the test material is different from the desired state, for example, the inside Detecting the presence or absence of a defect, the size of the defect, the position of the defect, the shape of the defect, or the type of the defect for defects or surface defects. Types of defects include scratches, voids, peeling, uneven density, and the like, and include the presence of foreign matter and burrs. The above detection includes measuring the position and size of the detected defect as well as the case of simply detecting the defect by examining the temperature of the inspection object.
Further, in the present invention, the cooling unit includes a hollow cylindrical portion that transmits light emitted by the discharge tube, the discharge tube is disposed to a hollow portion of the cylindrical portion, and the cooling unit is the cylinder. The space between the inner peripheral surface of the ring-shaped portion and the outer peripheral surface of the discharge tube is used as a flow path for the cooling fluid, and the cooling fluid is allowed to flow to the hollow portion. It is possible to provide a flaw detection apparatus in which the trigger conductive portion is disposed in the flow path.
Furthermore, in the present invention, the cooling unit includes a hollow cylindrical portion that does not shield the dielectric caused by the trigger voltage and transmits light emitted by the discharge tube, and the discharge tube extends to the hollow portion of the cylindrical portion. The cooling unit has a flow path for flowing the cooling fluid to the hollow portion, and the trigger conductive unit can provide a flaw detection apparatus disposed radially outside the cylindrical portion.
Furthermore, in the present invention, the heating device includes a reflecting member, and the reflecting member is a sub-reflecting portion disposed on the opposite side of the test material with the tubular portion interposed therebetween, and the sub-reflecting portion A main reflection portion disposed closer to the test material, and the sub reflection portion includes a reflection surface that reflects light received from the discharge tube toward the test material and the main reflection portion. The main reflection portion includes a reflection surface that reflects the light directly received from the discharge tube and the light reflected by the sub reflection portion toward the test material, and the main reflection portion is A first main reflection portion and a second main reflection portion, and the first main reflection portion and the second main reflection portion face each other's reflection surfaces, and the first main reflection portion and the second main reflection Light passing from the discharge tube toward the test material between the parts, and the reflection surface of the first main reflection part and the opposite of the second main reflection part The spacing between the surface, was able to provide flaw detector is intended to widen gradually toward the material being tested side from the sub-reflecting portion.
Further, in the present invention, the sub-reflecting portion is formed separately from the main reflecting portion, and at least the reflecting surface of each of the first main reflecting portion and the second main reflecting portion, the longitudinal direction of the discharge tube It has been possible to provide a flaw detection apparatus in which the contour projected onto a plane (virtual plane) orthogonal to the direction exhibits a portion of a parabola.
Furthermore, in the present invention, the first main reflection portion is extended from one end of the sub reflection portion and is continuous with the sub reflection portion, and the second main reflection portion is from the other end of the sub reflection portion. It is extended and is continuous with the sub-reflecting portion, and a plane orthogonal to the longitudinal direction of the discharge tube for the reflecting surface of each of the first main reflecting portion and the second main reflecting portion and the reflecting surface of the sub-reflecting portion It has been possible to provide a flaw detection apparatus in which the contour projected onto the (virtual surface) exhibits a continuous parabola.
Furthermore, in the present invention, the image acquisition device acquires an image by infrared thermography with an infrared camera, the trigger conductive portion is a trigger wire formed of a metal wire, and the discharge tube is A xenon lamp, the cylindrical portion is a quartz tube, the cooling portion includes a chiller for circulating the cooling liquid, and the heating device holds the cylindrical portion and both ends of the discharge tube The heating device includes a base on which the holding portion and the main reflection portion are attached, the heating device includes a housing, and the housing supports the main reflection portion and the housing The base is detachably attached to the housing, and the housing accommodates at least the discharge tube, the cylindrical portion, the trigger conductive portion, the holding portion, and the sub-reflecting portion. Said base from the body By leaving the main reflection portion in the housing by disengaging, the discharge tube, the cylindrical portion, the trigger conductive portion, the holding portion, and the sub reflection portion may be integrally taken out from the housing. It was possible to provide a flaw detection device that can

In the present invention, a heating device provided with a discharge tube for heating the surface of the test material, and an image acquisition device capable of observing the movement of heat inside the test material are provided. With regard to a flaw detection apparatus for inspecting defects, in which the discharge tube is water-cooled, the trigger conductive portion for inducing discharge of the discharge tube is not disturbed by the water cooling, and cooling of the discharge tube by water cooling is made effective. That is, according to the present invention, more effective cooling of the discharge tube by water cooling is realized by eliminating the need for securing a space dedicated to the arrangement of the trigger wire (trigger conductive portion) in the heating device. The present invention does not provide an air layer which separates the coolant from the discharge tube for the arrangement of the trigger conductive portion particularly in the inward and outward directions of the diameter of the discharge tube which is the light emission direction.
Further, the present invention prevents the structure of the heating device from being complicated by eliminating the space dedicated for the placement from the heating device.
In addition, by arranging the trigger conductive portion in the coolant flow path and directly bringing the trigger conductive portion along the surface of the discharge tube, the above-mentioned arrangement space dedicated to the trigger conductive portion is not necessary, and In this case, it is possible to arrange the trigger conductive part at a position closest to the discharge tube, and it is easier to perform discharge as compared with the case where the trigger conductive part is arranged at another position outside the discharge tube diameter.
Furthermore, in the present invention, the trigger conductive portion can be easily provided to the discharge tube by arranging the trigger conductive portion outside the flow path of the coolant, that is, outside the diameter of the cylindrical portion.
In particular, as in the inventions of the present application, a) the trigger conductive portion is disposed in the flow path of the coolant, and b) the trigger conductive portion is disposed outside the cylindrical portion located outside the flow path of the coolant. In the one shown in Patent Document 2, an inner tube 21 including a discharge tube (high-pressure discharge lamp 10) is provided and a trigger conductive portion (conductive wire 14) is disposed in a space between the inner tube 21 and the discharge tube. As described above (paragraphs 0023 and 0024 and FIG. 1), it is not necessary to arrange the inner pipe 21 between the coolant flow paths and to separate the space from the above. Therefore, in each of the above inventions of the present application, unlike the one in which the discharge tube is separated from the flow path of the coolant to disturb the water cooling as in Patent Document 2, the arrangement for the arrangement of the trigger conductive portion does not disturb the water cooling, The coolant can be brought into direct contact with the discharge tube, and more effective cooling of the discharge tube can be achieved.
Further, in the case of the above b), it is not necessary to involve the holding part in the arrangement of the trigger conductive part, and the arrangement of the trigger conductive part is made easy.
Furthermore, the reflection member for efficiently directing the light emitted from the discharge tube to the test material is configured by including the main reflection portion and the sub reflection portion separately formed from the main reflection portion, thereby including the discharge tube Setting of the distance between each of the cylindrical portions) and each position of the reflecting surface of the reflecting member is easy, and in particular, the trigger conductive portion is disposed outside the cylindrical portion positioned outside the flow path of the coolant in b) Even in this case, it is easy to design to secure an appropriate distance not to discharge the reflective member.
In addition, since the discharge tube, the cylindrical portion, the trigger conductive portion, the holding portion, and the sub-reflecting portion can be taken out of the housing as a unit integral with the base by removing the base from the housing, Maintenance and replacement of main parts are easy.

(A) is explanatory drawing of the outline | summary of the flaw detection apparatus by infrared thermography which concerns on this invention, (B) is explanatory drawing of the outline of the flaw detection apparatus by infrared thermography which concerns on other embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS Whole explanatory drawing which shows one Embodiment of the flaw detector which concerns on this invention. (A) is a schematic longitudinal cross-sectional view which shows one Embodiment of the heating apparatus with which the flaw detection apparatus which concerns on this invention is equipped, (B) is a principal part expanded sectional view of (A). (A) is a schematic longitudinal cross-sectional view which shows further another embodiment of the heating apparatus with which the flaw detection apparatus which concerns on this invention is equipped, (B) is a principal part expanded sectional view of (A). The top view of the reflective member shown to FIG. 2, (B) is a front view of the reflective member of (A). XX sectional drawing of FIG. 5 (B). (A) is sectional drawing which shows the state which removed the discharge tube unit from the main reflection part of FIG. 6, (B) is a top view of the main reflection part of (A). Sectional drawing of the reflective member of the flaw detector shown to FIG. Sectional drawing which shows the further another embodiment of the reflection member of the flaw detector which concerns on this invention.

(Outline of flaw detection equipment)
The present invention heats a test material by irradiating light with a metal material or plastic, a composite material containing CFRP (carbon fiber reinforced plastic), ceramic, and other materials as an inspection target, ie, a test material, The defects in the test material are examined by observing the change in heat conducted in the test material caused by Here, in particular, CFRP is taken as an example of the test material, and a preferred embodiment of the present invention will be described based on the drawings.
As shown to FIG. 1 (A), this example analyzes the thermography of the radiant heat from the test material m by the light irradiated to the test material m.
As shown in FIG. 1A and FIG. 2, the flaw detection apparatus includes an image acquisition device 1 and a heating device 3.

(Image acquisition device 1)
The image acquisition device 1 includes an infrared camera 10 and an image processing device 11.
The infrared camera 10 is directed to the test material m and captures a thermography of the test material m. In FIG. 2, white arrows indicate light emitted toward the test material m, and thick solid arrows indicate infrared rays emitted from the test material m toward the infrared camera 10.
When the test material m is fixed to a predetermined place such as a wall of a building or when the weight of the test material m is large and movement is difficult, the image acquisition device 1 and the heating device 3 are tested. The position of the image acquisition device 1 and the heating device 3 are adjusted so as to be disposed at a place where the material m is present and to take necessary spacing and orientation with respect to the test material m.
On the other hand, when the test material m has portability, the position of the test material m may be adjusted with respect to the image acquisition device 1 and the heating device 3 set in a predetermined place (FIG. 2). It is good also as what adjusts each position of acquisition device 1, heating device 3, and test material m.
When the test material m is lightweight, the test material m is fixed in position by an appropriate fixing means so that the position does not change with respect to the infrared camera 10 and the heating device 3 (discharge tube 4). For example, the test material m may be fixed to the table (not illustrated) by holding the test material m with a holder fixed to the table so as not to damage the test material m. However, it does not limit to what installs test material m in a fixed position and performs flaw detection. For example, the present invention includes one that performs flaw detection on a test material m on a production line. When flaw detection is performed on the test material m on the manufacturing line, the light emission of the discharge tube 4 of the heating device 3 is performed on the test material m moving on the manufacturing line, and the test material m of the infrared camera 10 When reaching the front, it is sufficient to stop the test material m while shooting in front of the infrared camera 10 by stopping the line. The infrared camera 10 may be moved in synchronization with the movement of the line, and the flaw detection may be performed without stopping the production line. Furthermore, it can be implemented as one that shoots only when passing, without stopping the line while the infrared camera 10 is fixed.

The image processing device 11 visualizes the image captured by the infrared camera 10 and displays it on a monitor so that the operator can analyze it. The display on the monitor may be one that displays the thermal image captured by the infrared camera 10 as it is, or one that records the thermal image captured by the infrared camera 10 as data and reproduces and displays the recorded data. Good.
In this example, the flaw detection apparatus includes the analysis device 2 constructed by a computer (hereinafter referred to as a PC) into which analysis software is introduced, and the PC analyzes the movement of heat from the image data acquired by the image processing device 11 The determination of the presence or absence of the defect of the inspection material and the size of the defect is performed, or the PC assists the above determination by the operator.

The image processing apparatus 11 can also be constructed by the PC. Specifically, in this example, the infrared camera 10 is connected to the PC via an image capture board or other known interface, and the thermography can be displayed on the monitor 12 of the PC. Further, the image processing apparatus 11 stores the captured image data in a storage device provided in the PC, can display the stored image data on the monitor 12, and can display the analysis result on the monitor 12. As the analysis software, one that supports the acquisition of the image data may be used.

When the principle of determining the presence or absence of a defect is simply mentioned, if there is a defect F1, F2, F3 such as a flaw, peeling, or void (void) in the test material m, it is given to the test material m by the heating device 1. The heat (a1, a2, a3 in FIG. 1A) is blocked by the air in the defects F1, F2, F3, and the movement is delayed. Therefore, the time of temperature change and temperature change at a certain position of the defects F1, F2 and F3 (the surface of the test material m irradiated with light) and the temperature at the position without defects (the surface of the test material m irradiated with light) Comparing the time of change and temperature change, the time of temperature change and temperature change are different. By analyzing the temperature change and the time of the temperature change, it is possible to detect a defect in the test material m and the size and position of the defect. In the PC monitor of FIG. 1A, g1 is the thermal image of the defect F1 located at the shallowest position, g2 is the thermal image of the defect F2 located at a position deeper than the defect F1, and g3 is deeper than the defect F2 The thermal image of the defect F3 in position is shown.

(Heating device 3)
The first embodiment of the heating device 3 will be described.
As shown in FIG. 2, the heating device 3 includes a discharge tube 4, a holding unit 30, a power supply (hereinafter referred to as a light emission power supply 5), a trigger conductive unit 6, a trigger power supply 7, a cooling unit 8, and a reflecting member 9. , And the housing 13.

The discharge tube 4 is a sealing tube in which a luminescent gas that emits light by discharge is sealed. Both ends of the discharge tube 4, that is, both positive and negative electrodes 40 of the discharge tube 4 are connected to respective electrodes of the light emission power supply 5 of the discharge. The enclosed tube is a transparent quartz tube. In this example, the discharge tube 4 is a xenon lamp filled with xenon gas. Particularly suitable for the discharge tube 4 is a xenon flash lamp which has a short light emission time and can repeat light emission with a short time interval.
The positive and negative electrodes 40 of the discharge tube 4 include an exposed portion 40 a exposed from the discharge tube 4 (quartz tube) and an inclusion portion 40 b included in the discharge tube 4.

The holding portion 30 is disposed in a pair at both ends of the cylindrical discharge tube 4 and holds the both ends of the discharge tube 4. The holding portion 30 is formed of a material having insulation and heat resistance. Specifically, it is desirable that the holding portion 30 be formed of a material having heat resistance that insulates the current flowing at the time of discharge and light emission of the discharge tube 4 and withstands high heat instantaneously generated at the time of discharge and light emission.
The entire holder 30 can be formed of an insulating material such as Teflon (registered trademark), acrylic, or other thermoplastic engineering plastic.
For example, it is desirable that the heat-affected portion of the holding portion 30 be formed of heat-resistant ceramic. Further, the whole of the holding portion 30 may be formed of ceramic having heat resistance. About the said ceramic used for the holding | maintenance part 30, an alumina ceramic is preferable. However, as long as the heat resistance suitable for the heat radiation of the discharge tube 4 is provided, it is possible to adopt and carry out other ceramics other than the alumina ceramic and materials other than the ceramic.
Examples of the material that can be used as the holding unit 30 include zirconia, silicon carbide, and quartz other than alumina in the heat-resistant material fine ceramic, for example.
As shown to FIG. 3A, the inside of the holding | maintenance part 30 is equipped with the insertion space 30a which inserts the edge part of the discharge tube 4, and the water flow connection part 30b. The end of the discharge tube 4 is fitted into the insertion space 30a.
In this example, a packing 34 for preventing liquid leakage of the cooling fluid b formed of a heat resistant material such as a silicon-based material, specifically silicon, is attached to the portion of the discharge tube 4 inserted into the insertion space 30a, The discharge tube 4 is fitted in the insertion space 30a.
In FIG. 3A, the reflecting member 9 and the housing 13 of the heating device 3 are omitted for the sake of simplicity.
The exposed portion 40 a of the electrode 40 of the discharge tube 4 is passed through each of the insertion spaces 30 a of the two holding portions 30. Wires 51, 52 connected to the light emission power source 5 to the exposed portions 40a of the electrodes 40 which project from the insertion space 30a and are exposed to the outside of the holding portions 30, ie, input cables for discharge (input wires for light emission) ) Is connected.
Specifically, sockets 51a and 52a are detachably mounted on exposed portions 40a of the electrodes 40 on the left and right of the discharge tube 4 (FIG. 3A). One socket 51 a is provided at the end of the one electric wire 51. The other end of the wire 51 is connected to one of the positive and negative poles of the light emission power source 5.
Another socket 52 a is provided at the end of the other electric wire 52. The other end of the wire 52 is connected to the positive and negative other poles of the light emission power source 5.
The discharge tube 4 can be electrically connected to the light emission power supply 5 by being mounted on the both sockets 51a and 52a as described above.
The light emission power supply 5 includes a capacitor. The light emission power source 5 is connected to a commercial power source to perform storage required for light emission of the discharge tube 4.

Further, the water flow communication unit 30 b is a space in which one end communicates with the insertion space 30 a and the other end communicates with the outside of the holding unit 30.
In this example, a leader insertion portion 30c is provided in the holder 30. The one end communicates with the water flow communication unit 30b and the other end communicates with the outside of the holder 30.
The pair of holding portions 30 disposed on the left and right of the discharge tube 4 shown in FIG. 2 is fixed to the base 31 via the jig 32. Reference numeral 33 in FIG. 2 denotes a positioning member which fastens the left and right holding portions 30 and determines the position of the holding portion 30 with respect to the discharge tube 4. The pair of positioning members 33 disposed to the outside of the left and right holding portions 30 are plate-like members, respectively, and have holes h through which the exposed portions 40a of the electrodes 40 pass (FIG. 3). The diameter of the hole h is smaller than that of the portion other than the exposed portion 40 of the electrode 40 of the discharge tube 4.
Fastening members 33a are pierced through the positioning members 33 at positions other than the holes h (FIG. 2). The fastening member 33a is a bolt having a head providing a seat surface, and a male screw is formed on the outer peripheral surface of the fastening member 33a.
In FIG. 2, only the head of the left and right fastening members 33a appears. The positioning portion 33 is provided with a hole through which the fastening member 33a is passed, and the tip end side of the fastening member 33a that has passed through the hole is screwed into a screw hole provided in the holding portion 30. A female screw is formed in the screw hole, and the male screw of the fastening member 33a is screwed.
The head seat surface of the fastening member 33 a sandwiches the positioning member 33 with the holding unit 30 and fastens the holding unit 30 and the positioning member 33. The positioning portion 33 fixed to the holding portion 30 positions the discharge tube 4 with respect to the holding portion 30.
Further, the base 31 is a plate material which is detachably fixed to the housing 13 directly or indirectly by known mounting means such as screwing and bolting. The base 31 constitutes a part of the housing 13 by being attached to the housing 13. For example, in the example shown to FIG. 2, the housing | casing 13 equips the downward direction with the opening, and has closed the said opening by said attachment of the base | substrate 31. As shown in FIG.
The discharge tube 4, the tubular portion 81, the trigger conductive portion 6 and the holding portion 30 are provided on the upper surface of the base 31, ie, the surface facing the housing 13, and the base 31 is attached to the housing 13. The shape portion 81, the trigger conductive portion 6, the holding portion 30, and the base 31 can be accommodated together in the housing 13.
At the time of replacement of the discharge tube 4, the discharge tube 4, the tubular portion 81, the trigger conductive portion 6 and the holding portion 30 can be removed together with the base 31 by removing the base 31 from the housing 13. That is, the discharge tube 4, the cylindrical portion 81, the trigger conductive portion 6, the holding portion 30, the jig 32, the positioning member 33, and the base 31 can be integrally attached to and detached from the housing 13 as one unit.
In the example shown in FIG. 2, the trigger power supply 7 is accommodated in the housing 13 separately from the above unit. However, the trigger power supply 7 may be disposed outside the housing 13.

The trigger conductive part 6 is a conducting wire which provides a trigger voltage in this example (hereinafter referred to as the trigger wire 6 as required).
The proximal end of the trigger wire 6 is connected to the output electrode of the trigger power supply 7. The trigger wire 6 receives a voltage from the trigger power supply 7 to induce a discharge when the discharge tube 4 emits light.
The trigger wire 6 is a bare metal wire not coated with an insulating material, and the base end of the trigger wire 6 is connected to the trigger power supply 7 via a wire 61 (hereinafter referred to as a conductive wire 61) coated with an insulating material. It is connected. Specifically, the trigger wire 6 (trigger conductive portion 6) is connected to the conductive wire 61 via the lead wire 60. The trigger wire 6 and the lead wire 60 are integrally formed metal wires. That is, the trigger wire 6 and the lead wire 60 are one wire, and in this wire, the section disposed to the discharge tube 4 and involved in the discharge is called the trigger wire 6 and is separated from the discharge tube 4 to discharge A section not involved is called a leader 60.
In the example shown in FIG. 2, the leader 60 is passed through the leader insertion portion 30c.
As the trigger power supply 7, one capable of supplying a necessary trigger voltage is employed. Specifically, the trigger power source 7 adopts one having a capability of supplying a trigger voltage of 20 to 30 KV.
The trigger power source 7 is a transformer (trigger transformer), and the primary side of the transformer is connected to the light source 5 for light emission.
In this example, the trigger wire 6 is a nickel wire. However, if the trigger wire 6 is a conducting wire capable of performing trigger discharge, it is also possible to adopt and implement a metal wire other than nickel.
The trigger wire 6 may be located at a position where a stable discharge is induced toward the discharge tube 4. The trigger wire 6 avoids the exposed portion 40 a of the electrode 40 of the discharge tube 4, and is disposed only between the positive electrode of the discharge tube 4 and the exposed portion 40 a of the negative electrode in the longitudinal direction of the discharge tube 4. In other words, if the trigger wire 6 is disposed only in the section sandwiched by the exposed portions 40 a of the positive and negative electrodes 40 in the longitudinal direction of the discharge tube 4, the inclusion portion 40 b of the positive and negative electrodes 40 of the discharge tube 4 It may overlap somewhat with the position of the direction. In the wire providing the trigger wire 6, the lead wire 60 is separated from the outer peripheral surface of the exposed portion 40a to the outside of the exposed portion 40a so as not to discharge.
The light emission power source 5 is connected to the PC by a signal line. The light emission power source 5 receives a command from the PC at the time of image acquisition by the image acquisition device 1 and discharges the accumulated charge to the discharge tube 4. The trigger power supply 7 connected to the light emission power supply 5 supplies a necessary voltage to the trigger line 6 in accordance with the discharge operation of the charge of the light emission power supply 5.

The trigger wire 6 is directly wound around the outer peripheral surface of the discharge tube 4 in this example, as shown in FIGS. 3 (A) and 3 (B). That is, the trigger wire 6 is spirally wound around the discharge tube 4.
The trigger wire 6 is loosely wound around the outer periphery of the discharge tube 4 so as not to inhibit the light emission of the discharge tube 4 and is not tightly wound to block light. The length of the trigger wire 6 can be appropriately changed according to the diameter and length of the discharge tube 4, the type, the calorific value, and the like.
As described above, the trigger wire 6 is not limited to being wound around the discharge tube 4, and it is not excluded that the trigger wire 6 simply follows the outer peripheral surface of the discharge tube 4 without being wound. For example, it may extend straight along the longitudinal direction of the discharge tube 4. Further, the trigger wire 6 is not limited to one in contact with the discharge tube 4, and the trigger wire 6 may be disposed only in the flow path r of the coolant b described later but not in contact with the discharge tube 4.
Aside from the one in which the entire section of the trigger wire 6 contacts the discharge tube 4 or the one in which the entire section of the trigger wire 6 does not contact the discharge tube 4, a part of the trigger wire 6 contacts the surface of the discharge tube 4 The other part of 6 can also be implemented as one not in contact with the discharge tube 4. For example, the trigger wire 6 wound around the surface of the discharge tube 4 may be partially lifted from the surface of the discharge tube 4 and separated from the discharge tube 4.
In this example, the tip of the trigger wire 6 is formed into a ring 6 a and is fastened to the outer periphery of the discharge tube 4.

In the case where a wide area of the test material m is inspected by the above-mentioned infrared thermography, the discharge tube 4 has an ability to heat a wide surface by light emission. There is no particular limitation on the power consumption, but depending on the condition of the test material m and the flaw detection, it is considered to adopt a discharge tube 4 that consumes 500 J to 20000 J of electric power per light emission, in particular. It is conceivable to adopt a discharge tube 4 that consumes 1000 J to 12000 J of electric power per light emission.
In the case of detecting exfoliation in the surface layer of CFRP, it has been confirmed that it can be implemented with a power consumption of 2000 J to 4000 J.
However, it does not exclude that the discharge tube 4 employ | adopts and implements the thing of the capability except the said numerical range with the to-be-tested material m. That is, the use of the discharge tube 4 having a power consumption of less than 500 J and the discharge tube 4 having a power consumption exceeding 20000 J per one light emission is not excluded.
The cooling unit 8 has a cooling capacity of the discharge tube 4 heated by the light emission.
The cooling unit 8 will be specifically described.
The cooling unit 8 includes a cylindrical portion 81 that forms the flow path r of the above-described coolant b, a tank T that supplies the coolant b, and a pump P that circulates the coolant b. Specifically, the cylindrical portion 81 is a hollow transparent quartz tube, and the inner diameter of the cylindrical portion 81 is larger than the outer diameter of the discharge tube 4. The cylindrical portion 81 is disposed to the outside of the discharge tube 4. That is, the discharge tube 4 is disposed in the hollow portion of the cylindrical portion 81. A gap between the outer circumferential surface of the discharge tube 4 and the inner circumferential surface of the cylindrical portion 81 constitutes the flow passage r of the cooling fluid b. The cooling fluid b is flowed into the above-mentioned gap which is the flow passage r, and the cooling fluid b directly contacts the surface of the discharge tube 4 during movement. As described above, the cylindrical portion 81 is a water cooling pipe which forms the flow path of the cooling fluid b outside the diameter of the discharge pipe 4.
The cylindrical portion 81 is fitted into the insertion space 30 a of the holding portion 30 together with the discharge tube 4. The cylindrical portion 81 is shorter than the discharge tube 4 as shown in FIG. 3A, and both ends (exposed portions 40a and 40b of the electrode 40) of the discharge tube 4 are cylindrical in the insertion space 30a of the holding portion 30. It protrudes from the both ends of the rod-like portion 81. As for the diameter of the insertion space 30a, the section into which the cylindrical portion 81 is inserted is a large diameter section larger than the small diameter section that accommodates the exposed portions 40a and 40b. The small diameter section and the large diameter section are concentric, and the cylindrical portion 81 is fitted to the large diameter section, and the discharge tube 4 is fitted to the small diameter section, thereby each position of the discharge tube 4 and the cylindrical portion 81 in the circumferential direction There can be provided a gap which becomes the flow passage r evenly.
Further, the packing 34 for preventing water leakage is attached to the exposed portions 40a and 40b of the discharge tube 4 fitted in the small diameter section. A packing 35 made of the same material as the packing 34 for preventing water leakage of the discharge tube 4 is also attached to a portion of the cylindrical portion 81 fitted in the insertion space 30 a.
With respect to the coolant b, the packings 34 and 35 prevent the holding portion 30 from leaking to the outside, and the coolant b can reliably remove the heat from the discharge tube 4.
In this example, the gap around the lead wire 60 in the lead wire insertion portion 30c is closed with a known adhesive or putty having heat resistance to endure the heat dissipation of the discharge tube 4.
The above-mentioned cylindrical portion 81, that is, the water-cooled tube emits the light to the outside by passing the light emitted from the discharge tube 4 and heats the test material m.

A hose 83 for introduction is connected to the water communication portion 30b of the holding portion 30 on one side (the left side in FIGS. 2 and 3A), and the hose 83 for introduction is connected to the tank T via the pump P. It is connected. A hose 84 for discharge is connected to the water communication portion 30b of the holding portion 30 on the other side (right side in FIG. 2 and FIG. 3A), and the collected coolant b is stored in the tank T again.
The cooling fluid b introduced into the water cooling pipe from the water flow communicating portion 30b of one holding portion 30 flows along the longitudinal direction of the discharge pipe 4 and the water cooling pipe (white arrow in FIG. 3B) The water is discharged from the water flow communication unit 30b of the unit 30, passes through the tank T, and is again introduced into the water cooling pipe from the water flow communication unit 30b of the one holding unit 30.
In addition, the coolant b needs to be a liquid having an insulating property. Pure water may be employed as the coolant b as a liquid having an insulating property.
Although not shown, the tank T or hoses 83 and 84 are provided with a temperature sensor and a conductivity meter. The temperature sensor and the conductivity meter are connected to the PC, and an alarm is issued from the PC if a rise in temperature above a predetermined level or a change in the purity of the coolant b above the predetermined level occurs. The operator can check the monitor 12 to see if the coolant b is at a temperature required for cooling and whether it is maintaining the purity with insulation.
If the insulation of the cooling fluid b is lowered, the cooling fluid b of the tank T may be replaced with one having high insulation. Even when the temperature of the cooling fluid b becomes high, it can be coped with by replacing the cooling fluid b, but here, the cooling unit 8 is provided with a chiller (not shown) and is automatically detected by detecting the temperature of the temperature sensor. The cooling device is operated to adjust the temperature of the coolant b. Therefore, only the change in the purity of the cooling water b may be performed, and the conductivity meter may be connected to the PC.
Specifically, the tank T is provided with the above-described cooling device such as a heat exchanger that cools the contained cooling fluid. The cooling device may be disposed in the circulation path of the cooling water b by providing the hoses 83 and 84 separately from the tank T.
As described above, the coolant b can be maintained at a constant water temperature and can be maintained to be pure water with respect to the water quality.
The flow rate of the coolant b and its flow rate are selected to correspond to the lamp characteristics and the heating energy. That is, a pump having an ability according to the selection of the value is adopted for the pump p. However, instead of providing the separate pump p, the coolant b may be circulated by a pump provided in the chiller.
In addition, an ion exchanger may be provided in the middle of the circulation path of the coolant b, and the insulation of the coolant b may be automatically recovered in response to the decrease in the insulation of the coolant b.
Although the temperature sensor and the conductivity meter are connected to a PC in the above, the temperature sensor and the conductivity meter may be connected to a programmable logic controller (PLC) to perform sequence control.

An example of the reflecting member 9 is shown in FIGS. 5 to 7.
The reflecting member 9 efficiently directs the light emitted by the discharge tube 4 to the test material m.
The reflecting member 9 is a curved plate-like body. The reflecting member 9 is disposed outside the cylindrical portion 81 at an interval from the cylindrical portion 81 and surrounds the cylindrical portion 81. The inner surface of the curved reflecting member 9 is a reflecting surface 90 that reflects the light of the discharge tube 4.
Specifically, the reflection member 9 includes a main reflection portion 92 and a sub reflection portion 91 (FIG. 6).
The sub reflection portion 91 is disposed on the opposite side of the test material m with the cylindrical portion 81 interposed therebetween, and the main reflection portion 92 is disposed closer to the test material m than the sub reflection portion 91.
The inner surfaces of the main reflection portion 92 and the sub reflection portion 91 form the reflection surface 90.
The reflection surface 90 of the sub reflection portion 91 reflects the light received from the discharge tube toward the test material m and the main reflection portion 92, and the reflection surface 90 of the main reflection portion 92 directly receives the light and the sub light received from the discharge tube 4. The light reflected by the reflection unit 91 is reflected toward the test material m.
Further, the main reflection portion 92 includes a first main reflection portion 92a and a second main reflection portion 92b. The first main reflection portion 92 a and the second main reflection portion 92 b make their reflection surfaces 90 face each other. The first main reflection portion 92a and the second main reflection portion 92b respectively extend from the discharge tube 4 (cylindrical portion 81) side to the test material m side, and between the first main reflection portion 92a and the second main reflection portion 92b The light traveling from the discharge tube 4 to the test material m is passed. In a side view of the reflecting member 9, the first main reflecting portion 92a and the second main reflecting portion 92b gradually increase the distance between the reflecting surfaces 90 from the sub-reflecting portion 91 side to the test material m side.

As shown in FIG. 5A and FIG. 6, the sub-reflecting portion 91 is formed in a bowl shape.
The side surface side of the main reflection portion 92 is covered by a side plate 95. The inner side surface of the side plate 95 is a surface having a reflectance lower than that of the reflection surface 90 of the main reflection portion 92 in this example. However, the inner side surface of the side plate 95 is not limited to a surface having a lower reflectance than the reflection surface 90 of the main reflection portion 92, and the reflectance of the inner side surface of the side plate 95 is the same as that of the reflection surface 90 of the main reflection portion 92. It may be the same as the reflectance or larger than the reflectance of the reflecting surface 90 of the main reflecting portion 92.
Further, in the main reflection portion 92 composed of the first main reflection portion 92a and the second main reflection portion 92b, the side plate 95 provides a connection surface for connecting the first main reflection portion 92a and the second main reflection portion 92b (see FIG. Fig. 5 (B) and Fig. 6).
For example, the test material m is disposed above the discharge tube 4 and light is emitted from the lower side toward the upper test material m, and the first main reflection portion 92a is a second main reflection member in the front-rear direction of the heating device 3 Assuming that the side plates 95 are disposed on the left and right sides of the main reflection portion 92, the side plates 95 are disposed on the left and right sides of the main reflection portion 92a, and the left and right sides of the second main reflection portion 92b. Connect with each other. However, the side plate 95 may not be connected to the first main reflection part 92 a and the second main reflection part 92 b as long as it covers the left and right of the main reflection part 92. The side plate 95 need not be integral with the main reflector 92.
The bottom of the main reflection part 92 is closed by the sub reflection part 91. In this example, the sub-reflection part 91 is formed separately from the main reflection part 92 and can be separated from the main reflection part 92 (FIGS. 6 and 7). The upper end of the main reflection portion 92 is opened as a light emission port 93.
Although not shown, the main reflection portion 92 is fixed to the aforementioned housing 13 by a known fixing means such as a screw, a bolt, a pin or welding.

In the example shown in FIGS. 5 to 7, the sub-reflecting portion 91 is provided to the base 31 together with the discharge tube 4, the tubular portion 81, the trigger conductive portion 6, the holding portion 30, the jig 32 and the positioning member 33. It can be removed from the housing 13 as part of the unit (FIGS. 2, 5-7). By removing the unit from the housing 13, the sub-reflection portion 91 can be separated from the main reflection portion 92 fixed to the housing 13 and removed from the housing 13.
As shown in FIGS. 7A and 7B, the bottom of the main reflection portion 92 from which the sub reflection portion 91 is removed opens as an opening 94.

As shown in FIG. 6, in this example, the reflection surface 90 of each of the sub reflection portion 91 and the main reflection portion 92 is projected on a plane (virtual surface) orthogonal to the longitudinal direction of the discharge tube 4 (cylindrical portion 81). The contour has a parabola.
It is preferable to arrange the discharge tube 4 and the cylindrical portion 81 with respect to the reflecting member 9 so that the focal point of the parabola coincides with the central axis (virtual line) of the discharge tube 4. However, even if the central axis of the discharge tube 4 is slightly deviated from the focal point, it may be in a range that does not affect the reflection.
The xenon lamp which is the discharge tube 4 is disposed on the focal point of the paraboloid of the reflection surface of the reflection member 9 to diffusely reflect the light emitted from the discharge tube 4, and the heating device 3 is Emit light towards material m.

For at least the reflection surface 90 of the reflection member 9, a metal plate with high reflectance can be employed. In this example, aluminum is employed as the reflecting member 9. In addition, by distributing the plurality of irregularities on the reflection surface of the reflection member 9, the received light can be irregularly reflected to be uniform light.
In addition to the example shown in FIGS. 6 and 7, the above-mentioned outline of the main reflection part 92, that is, the above-mentioned outlines of the first main reflection part 92a and the second main reflection part 92b assume a part of a parabola. Alternatively, the sub-reflecting portion 91 may be formed in a shape other than the bowl shape shown in FIGS. 6 and 7. Further, the contour of the sub-reflecting portion 91 is not limited to a strict parabola, and may be slightly different from the parabola if appropriate reflection can be performed.

Next, a second embodiment of the heating device 3 will be described using FIGS. 4 (A) and 4 (B).
In the second embodiment, the trigger wire 6 is disposed on the outer peripheral surface of the cylindrical portion 81 constituting the cooling unit 4.
In this example, particularly, the trigger wire 6 is spirally wound around the outer peripheral surface of the cylindrical portion 81. However, the trigger wire 6 may simply be along the outer peripheral surface of the cylindrical portion 81 without being wound.
In the second embodiment shown in FIG. 4, since the trigger wire 6 is disposed on the outer peripheral surface of the cylindrical portion 81 constituting the cooling portion 4, the trigger wire 6 has the structure of the discharge tube 4 or the cylindrical portion 81. It can be installed without affecting it.
Also in the second embodiment, it is preferable that the cooling fluid b be provided with an insulating property. In the second embodiment, the trigger wire 6 is not in direct contact with the cooling fluid b, but when a voltage is applied to the trigger wire 6, the cooling water b is energized and discharge of light emission is appropriately induced. It is to avoid the situation that it is not

In the second embodiment, since there is a risk that the trigger wire 6 discharges to the reflecting member 9 formed of aluminum, the discharge between the trigger wire 6 and each portion of the reflecting member 9 is not generated. It is necessary to make it a size. The size is suitably 3 mm or more when applying a voltage of 10 to 30 kv to the trigger wire 6. The magnitude may be changed according to the voltage supplied by the trigger line 6.

Further, in the example shown in FIG. 4A, the trigger power supply 7 is attached to the housing 13 by the bracket 14. The bracket 14 is a plate material formed in a shelf shape.
The bracket 14 is disposed on the right and left sides of the discharge tube 4 extending leftward and rightward, and is fixed to the housing 13. Forceps 62 are provided on each of the left and right brackets 14. The insulators 62 are disposed on the upper right side and the left side of the discharge tube 4 by being provided on each of the shelf portions at the top of the bracket 14.
The other end of the conductive wire 61 whose one end is connected to the trigger power source 7 is screwed to the forceps 62 of one of the brackets 14. The other end of the lead wire 60 extending from one end of the trigger wire 6 wound around the outer peripheral surface of the cylindrical portion 81 is fastened to the insulator 62 together with the conductive wire 61, and the lead wire 60 and the conductive wire 61 are Electrically connected. The side plate 95 is provided with a through portion 96 (FIG. 8). The lead wire 60 connects one end of the trigger wire 6 and the conductive wire 61 fixed to the insulator 62 through the penetrating portion 96.

Further, as shown in FIG. 4A, the other end of the trigger wire 6 wound around the outer peripheral surface of the cylindrical portion 81 also sandwiches the bracket 14 of the trigger power source 7 and the discharge tube 4 (cylindrical portion 81). It is screwed to the forceps 62 of the bracket 14 located on the opposite side. The penetrating portions 96 are formed on the left and right side plates 95 of the main reflection portion 92, respectively. The other one lead wire 60 screwed to the forceps 62 of the opposite side bracket 14 is also passed to the through portion 96 of the other side plate 95 (FIGS. 4A and 8). In this example, both penetration parts 96 are notched parts provided in the side plate 95, but holes may be provided in the side plate 95 to form penetration parts 96.
The left and right lead wires 60 are stretched between the trigger wire 6 and the forceps 62 so as to pull both ends of the trigger wire 6 wound around the tubular portion 81. The lead wire 60 is preferably stretched so as not to be slack.
In the penetrating portion 96, the lead wire 60 stretched between the trigger wire 6 and the insulator 62 is in contact with the reflection member 9 (main reflection member 92) in order to ensure insulation between the lead wire 60 and the reflection member 9. Do not have enough size. The penetrating portion 96 is not limited to the one having the spindle-shaped contour shown in FIG. 8 but may have another shape. Further, the arrangement of the lead wire 60, the conductive wire 61, the insulator 62, the trigger power source 7, and the bracket 14 is not limited to that illustrated, and can be appropriately changed. Furthermore, the shape of the bracket 14 is not limited to that illustrated either, but can be changed as appropriate.

FIG. 9 shows a modification suitable for securing the size which does not cause the above discharge with respect to the distance between the trigger wire 6 and each part of the reflecting member 9.
The example shown in FIG. 9 is the same as the example shown in FIGS. 7 and 8 in that the sub-reflecting portion 91 is formed separately from the main reflecting portion 92 for the reflecting member 9, but the opening of the main reflecting portion 92 Instead of aligning the edge of the auxiliary reflection portion 91 with the upper end of the auxiliary reflection portion 91, the auxiliary reflection portion 91 is disposed at a distance from the opening 94 of the main reflection portion 92. That is, in a state where the base 31 is attached to the housing 13, as shown in FIG. 9, the sub-reflecting portion 91 is disposed apart from the main reflecting portion 92 together with the discharge tube 4 (and the tubular portion 81). Do. Due to the arrangement, the contours of the sub-reflecting portion 91 and the main reflecting portion 92 each represent a part of a parabola, but the entire parabola is slightly interrupted. However, it is easy to design a space between the trigger wire 6 outside the cylindrical portion 81 and the main reflection portion 92.
The matters not particularly mentioned in the second embodiment and the modification shown in FIG. 9 are similar to those of the first embodiment.

(Other example of change of device)
In each of the embodiments shown in FIGS. 3 and 4, the trigger conductive portion 6 is a wire or trigger wire 6. However, in each of the embodiments of FIGS. 3 and 4, the trigger conductive portion 6 is a plate-like member (Metal plate) may be used, and further, a metal plating layer may be formed on the surface of the discharge tube 4, the inner peripheral surface of the cylindrical portion 81, or the outer peripheral surface of the cylindrical portion 81 by plating.
The cooling unit 8 may have an air cooling configuration such as a cooling fan in addition to the above-described water cooling configuration.

In addition, although the above-described unit is attached to and detached from the housing 13 at the time of replacement of the discharge tube 4 or the like, the discharge tube 4 may be directly removed from the base 31 together with the cylindrical portion 81. Specifically, the cylindrical portion 81 including the discharge tube 4 may be taken out from the radiation port 93 of the main reflection portion 92 of the housing 13 shown in FIG. When taking out the cylindrical portion 81 from the radiation port 93, the side surfaces 95 of the reflection member 9 do not disturb the vicinity of both ends of the discharge tube 4 (the exposed portion 40a of the electrode 40). The size and shape may be determined.
Further, when the cylindrical portion 81 is taken out from the radiation port 93, not only the cylindrical portion 81 but also the sub-reflection portion 91 may be formed along with the cylindrical portion 81 so as to be able to be taken out from the radiation port 93.
Furthermore, the main reflection portion 92 may be removable together with the sub reflection portion 91 from the housing 13 shown in FIG. When the main reflection portion 92 is to be removed from the housing 13 together with the sub reflection portion 91, the main reflection portion 92 is included in the unit, and the main reflection is performed together with other constituent members of the unit by removing the base 31 from the housing 13. The portion 92 may be removable.
In the example shown in FIG. 2, the base 31 closes the opening at the bottom of the housing 13, but an opening for inserting and removing the unit may be provided in addition to the bottom of the housing 31. When the unit is taken in and out from an opening other than the bottom of the housing 31, the opening may not be closed by the base 31, but may be closed by a separate lid.

The sub reflection part 91 may be integrally formed with the main reflection part 92 and may not be separated from the main reflection part 92 (not shown). That is, the first main reflection portion 92 a is extended from one upper end of the sub reflection portion 91 to be continuous with the sub reflection portion 91, and the second main reflection portion 92 b is from the other upper end of the sub reflection portion 91. It may be extended to be continuous with the sub-reflecting portion 91.
When the sub-reflecting portion 91 is integrated with the main reflecting portion 92 or when it is separable from the main reflecting portion 92, the contour projected on a plane orthogonal to the longitudinal direction of the discharge tube 4 draws the parabola. Is preferred. However, it does not exclude that the said contour is made into another curve which approximates a parabola.
In the above description of the reflecting member 9, the test material m is disposed above the discharge tube 4, but for convenience of describing the relative positional relationship of each part, the upper side of the discharge tube 4 There is no limitation to the arrangement of the test material m.

(Example of change in flaw detection method)
In each embodiment described above, the infrared camera 10 is disposed on the same side as the heating device 3 (discharge tube 4) with respect to the test material m to acquire an image.
In addition to this, as shown in FIG. 1 (B), an infrared camera may be disposed on the opposite side to the heating device 3 (discharge tube 4) with the test material m in between to obtain an image.
In the example shown to FIG. 1 (B), unlike the example shown to FIG. 1 (A), the test material m is arrange | positioned between the heating apparatus 3 (discharge tube) and the infrared camera 10, The heat conducted through the test material m is observed from the opposite side of the heating device 3 with the test material m interposed. In the example shown to FIG. 1 (B), the test material m is mounted in the top part c1 of the casing c which covers the circumference | surroundings of the infrared camera 10. FIG. The top portion c1 of the casing c on which the test material m is placed has a penetrating portion c2 penetrating vertically. The test material m is placed on the top portion of the casing c so as to close the penetration portion c1. The infrared camera 10 directed to the through portion c in the casing c can capture a thermography of heat conducted to the test material m through the through portion c2.
Also in the example shown to FIG. 1 (B), about the matter which is not mentioned in particular, it is the same as that of embodiment mentioned above.
Moreover, the heating device 3 is not limited to what is used for the said flaw detection apparatus, It is good also as what is used for uses other than the said flaw detection apparatus.

(Summary)
The discharge tube 4 such as a xenon lamp used in nondestructive inspection by infrared thermography is different from one for laser, and in order to irradiate the light of the discharge tube 4 toward the test material, a part of the discharge tube 4 is outside Needs to be open. That is, light is projected from the radiation port 93 provided in the reflecting member 9 toward the test material m. Further, in the above nondestructive inspection, even in the case of cooling, as in the case of laser application, the lamp (discharge tube), the laser rod, and the entire reflecting surface can not be submerged in structure.
And in nondestructive inspection by infrared thermography, (1) cooling and (2) irradiation of light are performed simultaneously. Further, in order to discharge the lamp (discharge tube), it is required that (3) a high voltage trigger pulse of 10 to 30 kV be emitted from the outside at a required timing.
In the present invention, the cooling liquid 8 is moved on the outer side of the discharge tube 4 with respect to the cooling unit 8, and the discharge tube 4 is water-cooled, and the trigger wire 6 is cooled by the cooling unit 8 with respect to the discharge tube 4. The infrared thermography flaw detection apparatus which satisfies the requirements of the above (1) to (3) can be provided by arranging the position to an unobstructed position.

1 image acquisition device 2 analysis device 3 heating device 4 discharge tube 5 (light emission) power source 6 trigger wire (trigger conductive portion)
Reference Signs List 6 a (trigger wire 6) wheel 7 trigger power supply 8 cooling unit 9 reflection member 10 infrared camera 11 image processing device 12 monitor 13 housing 14 bracket 30 holding unit 30 a insertion space 30 b water communication portion 30 c leader line insertion portion 31 base 32 Jig 33 Positioning member 33a Fastening member 34 Packing 35 Packing 40 Electrode 40a (of discharge tube 4) Exposed portion 40b (of electrode 40) Containment portion 51 Wire 51a (of wire 51) Socket 52 Wire 52a (wire 52) ) Socket 60 Lead wire 61 Conductive wire 62 Ladder 81 Tubular part 83 Hose for introduction 84 Hose for discharge 90 Reflective surface 91 Secondary reflector 92 Main reflector 92a First main reflector 92b Second main reflector 93 Radiation Port 94 Opening 95 Side plate 96 Penetration part a1 heat a2 heat a3 heat b cooling fluid c ke Thing m (the positioning member 33) material being tested r flow path F1 defect F2 defect F3 defect g1 thermal image h of thermal image g3 defects F3 thermal image g2 defect F2 defect F1 holes P Pump T Tank

Claims (7)

A heating device provided with a discharge tube for heating the surface of the test material by emitting light; and an image acquisition device capable of observing a change in heat inside the test material caused by the heating; A flaw detection apparatus for examining defects in the test material, the heating device including a trigger conductive unit connected to a trigger power supply, the trigger conductive unit supplying a trigger voltage for inducing discharge of the light emission of a discharge tube In
The heating device includes a cooling unit that cools the discharge tube.
The cooling unit water-cools the discharge tube by moving a cooling liquid outside the diameter of the discharge tube,
The flaw detection apparatus characterized in that the trigger conductive part is disposed at a position not disturbing the water cooling with respect to the discharge tube. The cooling unit includes a hollow cylindrical portion that transmits light emitted from the discharge tube, and the discharge tube is disposed to a hollow portion of the cylindrical portion.
The cooling unit flows the cooling fluid to the hollow portion, with a space between an inner circumferential surface of the cylindrical portion and an outer circumferential surface of the discharge tube as a flow passage of the cooling fluid.
The coolant has insulation to the trigger voltage,
The flaw detection device according to claim 1, wherein the trigger conductive portion is disposed in the flow path. The cooling unit includes a hollow cylindrical portion that does not shield the dielectric caused by the trigger voltage and transmits light emitted from the discharge tube, and the discharge tube is disposed to the hollow portion of the cylindrical portion.
The cooling unit has a flow path for flowing the cooling fluid to the hollow portion,
The flaw detection device according to claim 1, wherein the trigger conductive portion is disposed radially outward of the cylindrical portion. The heating device comprises a reflective member,
The reflecting member includes a sub-reflecting portion disposed on the opposite side of the test material with respect to the tubular portion, and a main reflecting portion disposed closer to the test material than the sub-reflection portion.
The sub-reflecting portion includes a reflecting surface that reflects light received from the discharge tube toward the test material and the main reflecting portion,
The main reflection portion includes a reflection surface that reflects the light directly received from the discharge tube and the light reflected by the sub reflection portion toward the test material,
The main reflection portion includes a first main reflection portion and a second main reflection portion.
The first main reflection portion and the second main reflection portion face each other's reflection surfaces, and light traveling from the discharge tube to the test material between the first main reflection portion and the second main reflection portion Through
The distance between the reflection surface of the first main reflection portion and the reflection surface of the second main reflection portion is gradually expanded from the sub-reflection portion side toward the test material side. The flaw detection device described. The sub-reflecting portion is formed separately from the main reflecting portion,
The outline projected on a plane orthogonal to the longitudinal direction of the discharge tube exhibits at least a portion of a parabola on the reflection surfaces of at least the first main reflection portion and the second main reflection portion. Flaw detection equipment. The first main reflection portion is extended from one end of the sub reflection portion and is continuous with the sub reflection portion,
The second main reflection portion is extended from the other end of the sub reflection portion and is continuous with the sub reflection portion,
The reflecting surface of each of the first main reflecting portion and the second main reflecting portion and the reflecting surface of the sub-reflecting portion exhibit a parabola in which the contours projected onto a plane orthogonal to the longitudinal direction of the discharge tube are continuous. The flaw detection apparatus according to claim 4. The image acquisition device is for acquiring an infrared thermography image with an infrared camera,
The trigger conductive portion is a trigger wire formed of a metal wire,
The discharge tube is a xenon lamp,
The cylindrical portion is a quartz tube,
The cooling unit includes a chiller for circulating the coolant.
The heating device includes a holding unit that holds both ends of the discharge tube together with the cylindrical portion,
The heating device includes a base on which the holding unit and the main reflection unit are attached,
The heating device comprises a housing;
The housing supports the main reflection portion and the base is detachably attached to the housing.
The housing accommodates at least the discharge tube, the cylindrical portion, the trigger conductive portion, the holding portion, and the sub-reflecting portion.
By removing the base from the housing, the main reflection portion is left in the housing, and the discharge tube, the cylindrical portion, the trigger conductive portion, the holding portion, and the sub-reflection portion are integrated. The flaw detector according to claim 5, which can be taken out of the case.