JP2008089395A - Photocatalyst meter, optical power measuring method and sensor head used therein - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photocatalyst meter for precisely measuring the concentration of titanium dioxide by hermetically closing an indicator in a light transmissible container without coloring a measuring target to prevent the oxidation of the indicator. <P>SOLUTION: The photocatalyst meter is constituted using a sensor head composed of an indicator housing container for hermetically closing the indicator, the housing part for holding the indicator housing container, a holder having a first through-hole for permitting a UV fiber to pass, a second through-hole for permitting a laser beam to pass and a third through-hole for permitting a light detection fiber detecting the reflected beam of a laser to pass and a contact member provided with a window and coming into contact with the measuring target at the time of measurement. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a photocatalyst meter for measuring the titanium dioxide concentration in a paint or the like in which titanium dioxide (TiO2) is added to, mixed with, or combined with a paint, a photocatalytic ability evaluation method for measuring the photocatalytic (sterilization) ability of titanium dioxide, and The present invention relates to a sensor head used therefor.

As a conventional photocatalyst meter, Patent Document 1 discloses a base having a layer of a photocatalytic functional film and a through-hole formed in a mounting portion of a material to be measured in which the surface of the film is colored, and a base for the material to be measured. A case having a black light lamp arranged at a position opposite to the base and detachably receiving a light emitting element or a light receiving element is disposed on an axis perpendicular to the surface of the material to be measured and on the front and back of the material to be measured A photocatalyst function evaluation apparatus is disclosed in which a pair is provided so as to be opposed to each other and a pair is provided so as to be opposed to the reflected optical axis of the surface of the material to be measured.
Japanese Unexamined Patent Publication No. 000-62120

As a method for measuring the photocatalytic ability, Patent Document 2 discloses an evaluation test method for photocatalyst applied materials, in which methylene blue 4 is mixed in an adhesive 3 made of a jelly-like substance or a jelly-like tape to constitute an indicator 2, and this indicator 2 is adhered to the surface of the evaluation object 1 made of a photocatalyst-applied material, and the photocatalytic reactivity of the evaluation object 1 is evaluated by a change in coloration of methylene blue 4 of the indicator 2. The photocatalytic reaction can be evaluated regardless of whether the evaluation object 1 is porous, has high water absorption, or is inclined. Since it is only necessary to stick the indicator 2 to the surface of the evaluation object 1, it is not necessary to cut out the specimen from the evaluation object 1, and the photocatalyst application material that can evaluate the photocatalytic performance of the evaluation object 1 in a non-destructive state The evaluation test method is published.
JP 2006-3105 A

  However, in the photocatalyst function evaluation apparatus and the photocatalyst application material evaluation test method described in Patent Documents 1 and 2, the indicator is directly colored with the indicator, and the indicator touches the air and oxidizes with high accuracy. Concentration and photocatalytic ability could not be measured.

  Therefore, the present invention provides a photocatalyst meter and a photocatalyst that accurately measure the titanium dioxide concentration and the photocatalytic ability by preventing the indicator from being oxidized without coloring the measurement object and sealing the indicator in a light-transmitting container. It is an object of the present invention to provide a capability measuring method and a sensor head used therefor.

In order to solve the above-mentioned problem, the present invention comprises an indicator storage container 3 comprising a permeable cell 3a having a slit 3c into which an indicator 7 is inserted, and a plug 3b for sealing the permeable cell 3a, and the indicator storage container 3. To the holding portion 2f to be held, the indicator 7, the first through hole 2b through which the UV fiber 4a for irradiating the ultraviolet ray 4f is inserted to the storage portion 2f, and the laser fiber 4b for irradiating the laser 4g to the storage portion 2f. The second through hole 2c, the holder 2a having a third through hole 2d for inserting the light receiving fiber 4c for receiving the reflected light 4h of the laser 4g to the housing portion 2f, and the measurement object 8a side of the holder 2a are attached and irradiated. A sensor head 2 comprising a contact member 2h that comes into contact with the measuring object 8a during measurement, provided with a window 2i through which the ultraviolet ray 4f and laser 4g pass. An ultraviolet light generator 5p that generates ultraviolet light 4f that passes through the indicator container 3 and is irradiated to the measurement target 8a, a laser generator 5q that generates a laser 4g that is irradiated to the indicator 7, and a reflected light reflected from the indicator 7 A light detection unit 5r for detecting 4h, a control unit 5s for calculating the concentration of titanium dioxide in the measurement object 8a from the light intensity and calibration curve data detected by the light detection unit 5r, and controlling the operation of each component, the control UV that transmits the measurement main body 5 including the display unit 5b that displays the measurement value obtained by the unit 5s, the ultraviolet ray generation unit 5p, the ultraviolet ray 4f from the laser generation unit 5q, the laser 4g, and the reflected light 4h from the indicator 7. The configuration of the photocatalyst meter 1 is characterized by comprising a cable 4 comprising a fiber 4a, a laser fiber 4b, and a light receiving fiber 4c.
The permeable cell 3a is a quartz cell, and has a configuration of the photocatalyst meter,
The structure of the photocatalyst meter 1 is characterized in that the support 6 is attached to the screw hole 2j provided in the holder 2a, and the sensor head 2 is fixed during measurement.
The indicator 7 is injected into the measuring object 8a mixed with titanium dioxide, the sealed quartz cell is brought into contact therewith, the quartz cell containing the indicator 7 is transmitted, the measuring object 8a is irradiated with the ultraviolet rays 4f, and the laser 4g is used as the indicator. 7, the reflected light 4 h of the laser 4 g from the indicator 7 is detected, and the measurement value obtained from the reflected light 4 h is collated with a reference value which is a photocatalytic ability of titanium dioxide having a known concentration, and the measurement object 8 a The photocatalytic ability measuring method is characterized by measuring the concentration of titanium dioxide,
The quartz cell is an indicator storage container 3 having a slit 3c for inserting the indicator 7 and sealed from the stopper 3b. The storage portion 2f for holding the indicator storage container 3 and the indicator 7 are irradiated with ultraviolet rays 4f. The first through-hole 2b through which the UV fiber 4a is inserted to the housing part 2f, the second through-hole 2c through which the laser fiber 4b for irradiating the laser 4g to the housing part 2f is received, and the received light that receives the reflected light 4h of the laser 4g Measured at the time of measurement with a holder 2a having a third through hole 2d through which the fiber 4c is inserted to the housing portion 2f and a window 2i through which the irradiated ultraviolet light 4f and laser 4g are attached, attached to the measurement object 8a side of the holder 2a. It is housed in a sensor head 2 made of a contact member 2h that comes into contact with the object 8a, irradiated with ultraviolet rays 4f from the UV fiber 4a, and Irradiating a laser to 4g over Heather fiber 4b, receives reflected light 4h from the indicator 7 by the receiving fiber 4c, a structure of the photocatalyst ability measuring method characterized by obtaining a measured value from the reflected light 4h,
The housing 2f for holding the indicator storage container 3, the UV fiber 4a for irradiating the ultraviolet rays 4f toward the indicator 7, the first through hole 2b for inserting the UV fiber 4a to the housing 2f, and the laser fiber 4b for irradiating the laser 4g are stored. A holder 2a having a second through-hole 2c inserted through the portion 2f, a third through-hole 2d through which the light-receiving fiber 4c receiving the reflected light 4h of the laser 4g is received up to the storage portion 2f, and the measurement object 8a side of the holder 2a The sensor head 2 is used for the measurement of the photocatalytic ability measurement, which includes the contact member 2h that comes into contact with the measurement target 8a at the time of measurement provided with the window 2i through which the attached ultraviolet light 4f and laser 4g are passed.

  Since this invention is the above structure, the following effects are acquired. 1stly, since the indicator storage container which consists of a permeable cell which has a slit which puts an indicator, and the stopper which seals the said permeable cell is employ | adopted, the oxidation of an indicator can be prevented. Further, since the sensor head and the main body are connected and separated by a cable, measurement at the measurement site is easy.

  Second, by making the permeable cell a quartz cell, the transmittance is improved, the measurement accuracy is improved, and the titanium dioxide concentration and the photocatalytic ability are accurately obtained even in a short time with a lower energy level of ultraviolet rays. Can be measured. Therefore, the photocatalyst meter can be manufactured in a compact and inexpensive manner.

  Third, since the sensor head can be attached to a support such as a camera or a video tripod, the measurement point can be fixed and the measurement accuracy is high.

  Fourthly, the indicator container is housed in the sensor head, and ultraviolet light and laser are irradiated by the optical fiber, so that it is possible to block light such as external sunlight and fluorescent light, and suppress the influence of external light, It is possible to accurately measure the titanium dioxide concentration and the photocatalytic ability of the measurement target. In addition, by creating the contact member 2h in contact with the measurement target with a material having elasticity such as rubber, measurement is possible even if the measurement target is not flat and has unevenness.

  For the purpose of proposing a photocatalyst meter, an indicator storage container 3 comprising a quartz cell having a slit 3c for inserting an indicator 7 and a plug 3b for sealing the quartz cell, a storage portion 2f for holding the indicator storage container 3, and the indicator 7, the first through hole 2b through which the UV fiber 4a for irradiating the ultraviolet ray 4f is inserted to the housing part 2f, the second through hole 2c through which the laser fiber 4b for irradiating the laser 4g to the housing part 2f, and the laser 4g. The light receiving fiber 4c that receives the reflected light 4h is inserted into the third through hole 2d through which the receiving portion 2f is inserted, the holder 2a having the screw hole 2j for attaching the support 6 and the measurement object 8a side of the holder 2a. The window 2i through which the ultraviolet ray 4f and the laser 4g are passed is provided with a contact member 2h that comes into contact with the measurement object 8a at the time of measurement. From the head 2, the ultraviolet ray generation unit 5 p that generates the ultraviolet ray 4 f that passes through the indicator storage container 3 and is irradiated to the measurement target 8 a, the laser generation unit 5 q that generates the laser 4 g that is irradiated to the indicator 7, and the indicator 7 A light detection unit 5r that detects the reflected light 4h that has been reflected, and a control unit that calculates the concentration of titanium dioxide in the measurement object 8a from the light intensity and calibration curve data detected by the light detection unit 5r, and controls the operation of each component. 5s, a measurement main body 5 comprising a display unit 5b for displaying the measurement value obtained by the control unit 5s, the ultraviolet ray generation unit 5p, the ultraviolet ray 4f from the laser generation unit 5q, the laser 4g, and the reflected light 4h from the indicator 7. A configuration of the photocatalyst meter 1 including a cable 4 including a UV fiber 4a, a laser fiber 4b, and a light receiving fiber 4c, It was realized in Rukoto.

  Hereinafter, a photocatalyst meter, a photocatalytic ability measuring method, and a sensor head according to the present invention will be described in detail with reference to the accompanying drawings.

  First, the photocatalyst meter according to the present invention will be described in detail. FIG. 1 is an overall schematic diagram of a photocatalyst meter according to the present invention.

  The photocatalyst meter 1 includes a permeable cell 3a having a slit 3c for inserting an indicator 7 and an indicator storage container 3 comprising a plug 3b for sealing the permeable cell 3a, a sensor head 2, a measurement main body 5, and the inside of the sensor head 2. The cable 4 is composed of a UV fiber 4a, a laser fiber 4b, and a light receiving fiber 4c.

  The sensor head 2 has a substantially cylindrical shape, a storage part 2f for holding the indicator storage container 3, a first through hole 2b for inserting a UV fiber 4a for irradiating ultraviolet light 4f toward the indicator 7 to the storage part 2f, A holder having a second through hole 2c through which the laser fiber 4b for irradiating the laser 4g is inserted to the housing portion 2f, and a third through hole 2d through which the light receiving fiber 4c for receiving the reflected light 4h of the laser 4g is inserted to the housing portion 2f. 2a and a contact member 2h that is attached to the measurement object 8a side of the holder 2a and that is provided with a window 2i through which the irradiated ultraviolet ray 4f and laser 4g pass, and that contacts the measurement object 8a during measurement. The measurement main body 5 connects the plug 5a to a household 100V and receives power supply.

  In order to make the indicator storage container 3 protrude slightly from the holder 2a, if the cutout portion 2e cut in part is provided, the indicator storage container 3 can be easily put in and out. Further, the housing portion 2f can be easily created by shaving up and down as shown in FIG. 1 of the sensor head 2 and attaching the stopper 2g. The holder 2a may be made of aluminum.

  When the contact member 2h is made of a material having elasticity such as rubber, even if the measurement object is uneven, the external light is blocked and the photocatalytic ability can be measured with high accuracy.

  The support 6 may be a tripod generally used for cameras, videos, and the like. By screwing the screw 6a into the screw hole 2j provided in the holder 2a and fixing the sensor head 2, it is possible to fix and measure one point of the measurement object.

  The measurement main body 5 includes an ultraviolet ray generation unit 5p that generates ultraviolet rays 4f that pass through the indicator storage container 3 and irradiate the measurement target 8a, a laser generation unit 5q that generates a laser 4g that irradiates the indicator 7, and the indicator 7 A light detection unit 5r that detects the reflected light 4h that has been reflected, and a control unit that calculates the concentration of titanium dioxide in the measurement target 8a from the light intensity and calibration curve data detected by the light detection unit 5r, and controls the operation of each component. 5s, and a display unit 5b for displaying the measurement value obtained by the control unit 5s. Moreover, the measurement main body 5 can be connected to a household 100V outlet and can be supplied with power. As a result, the measurement can be easily performed at the measurement place, and since it has a compact configuration, it can be easily moved down.

  The cable 4 includes a UV fiber 4a, a laser fiber 4b, and a light receiving fiber 4c through which the ultraviolet ray 4f, laser 4g, and reflected light 4h from the indicator 7 pass, respectively. By connecting the sensor head 2 and the measurement main body 5 with the cable 4, the measurement point can be easily measured by hand and fixed to a tripod without being limited to the measurement position.

  FIG. 2 is a front view of a sensor head constituting the photocatalyst meter according to the present invention. The first to third through holes 2b to 2d are visible, and a window 2i narrower than the permeable cell 3a is provided in the contact member 2h. Note that the holder 2a, the contact member 2h, and the stopper 2g may be integrally molded to provide the storage portion 2f. A dashed line AA represents the cross-sectional position shown in FIG.

  FIG. 3 is a plan view when the indicator storage container is stored in the sensor head. The dotted line indicates the UV fiber 4a, the laser fiber 4b, and the light receiving fiber 4c. In addition, although the 1st-3rd through-holes 2b-2d penetrated toward the accommodating part 2f here from the back, you may provide from the side to the accommodating part 2f. However, it is desirable to irradiate the measurement object 8a vertically with ultraviolet rays and a laser.

  FIG. 4 is a side view of the sensor head. A dashed line BB represents the cross-sectional position shown in FIG. FIG. 5 is a bottom view of the sensor head. On the bottom surface of the holder 2a, a screw hole 2j for connecting and fixing to a support 6 such as a tripod is provided. Further, a notch 2k may be provided on the bottom surface so that a tripod or the like can be stably fixed. FIG. 6 is a rear view of the sensor head.

  FIG. 7 is a partially exploded front view of the sensor head when the indicator storage container is stored in the sensor head. FIG. 7A is a front view of the sensor head 2 excluding the contact member 2h. FIG. 7B is a front view of the sensor head 2 (holder 2a) when the contact member 2h and the indicator storage container 3 are removed. The contact member 2h and the stopper 2g are adhesives and are affixed to the holder 2a to form a storage portion 2f and hold the indicator storage container 3.

  FIG. 8 is a cross-sectional view of the sensor head. 8A is a cross-sectional view taken along the dashed line AA shown in FIG. 2, and FIG. 8B is a cross-sectional view taken along the dashed line BB shown in FIG. In the permeable cell 3a, a slit 3c for inserting the indicator 7 is formed, and the indicator 7 is sealed by the stopper 3b. The indicator is optimally methylene blue, but any indicator that changes color by ultraviolet rays may be used. The UV fiber 4a, the laser fiber 4b, and the light receiving fiber 4c are covered with a covering material 4e.

  FIG. 9 is a front view of a main body constituting the photocatalyst meter according to the present invention. The photocatalyst meter 1 is activated by the main power source 5c, and the measurement start switch 5d irradiates the laser and counts the reflected light reflected on the indicator 7. The ultraviolet ray irradiation start switch 5f irradiates the measurement object 8a with ultraviolet rays, and the ultraviolet ray intensity can be changed by the ultraviolet ray intensity changeover switch 5g. Further, irradiation and counting can be interrupted by the interruption switch 5e.

  The ultraviolet ray that is generated in the measurement main body 5 and irradiates the measurement object 8a is extracted, and the ultraviolet irradiation port 5h to which the UV fiber 4a is connected, the laser that irradiates the indicator 7, and the light receiving fiber 4c that receives the reflected light are connected. There is a laser irradiation receiving portion 5i.

  In addition, there is a display unit 5b that displays the counted reflected light of the laser or compares it with the photocatalytic ability of titanium dioxide input in advance and displays the calculated concentration of titanium dioxide.

  FIG. 10 is a rear view of the main body constituting the photocatalyst meter according to the present invention. Since a power source from a 12 VAC adapter and a household 100 V power source can be used as the power source, there are a DC 12 V plug-in portion 5 n into which a power source from a DC 12 VAC adapter is plugged in and a 100 V plug-in portion 5 m into which a home 100 V power source is plugged.

  There are a lamp for generating ultraviolet rays and a laser generator inside, and a ventilation fan 5k and an air outlet are provided in order to cool the temperature inside the measurement main body 5. The measured data can be sent from the USB port to the personal computer, and the measured values can be calculated and managed.

  Next, the photocatalytic ability measuring method according to the present invention will be described in detail. FIG. 11 is a cross-sectional view of the sensor head when the titanium dioxide concentration is measured with the photocatalyst meter according to the present invention. The photocatalytic ability measuring method according to the present invention includes a measuring object 8a mixed with titanium dioxide, for example, a paint, glass, an inner coating of a building material, an outer wall material of a building, wood, a resin applied to a material to be coated 8 such as a wall. The indicator 7 is injected into the measurement object 8a on the surface of each panel, concrete material, magnetism, tile, etc. used for automobiles, and the sealed permeable cell 3a is brought into contact with the permeable cell 3a containing the indicator 7. The measurement object 8a is irradiated with ultraviolet light 4f, the laser 4g is irradiated onto the indicator 7, the reflected light 4h of the laser 4g from the indicator 7 is detected, and the measurement value obtained from the reflected light 4h is obtained with a known concentration. It is characterized in that the concentration of titanium dioxide in the measurement object 8a is measured by collating with a reference value that is the photocatalytic ability of titanium dioxide.

   FIG. 11 is a diagram showing the measurement principle of the photocatalyst meter according to the present invention. The control unit installed inside the measurement main body 5 controls the display unit 5b, the ultraviolet ray generation unit 5p, the laser generation unit 5q, and the light detection unit 5r that receives the reflected light 4h, and the measured reflected light 4h. Is displayed on the display unit 5b. Further, the concentration of titanium dioxide in the measurement target can be calculated from the light intensity (count number) detected by the light detection unit 5r and the calibration curve data, and can be displayed on the display unit 5b. Furthermore, the count number of the reflected light 4h representing the color change of the indicator due to the photocatalytic action for a predetermined time from the USB port 5o can be transmitted to the PC 5t (personal computer), and the titanium dioxide concentration can be calculated by the PC 5t.

  FIG. 13 is an example of a calibration curve used for measuring the titanium dioxide concentration. FIG. 13A shows data obtained by measuring the reflected light of the laser from the indicator 7 when a known titanium dioxide is dissolved in the indicator 7 such as methylene blue at a constant concentration and irradiated with a certain amount of ultraviolet rays for a certain period of time. FIG. 13B is a graph (calibration curve graph) at that time. The horizontal axis represents the titanium dioxide concentration (g / ml) in the indicator 7, and the vertical axis or the number of reflected light counted by the photodetector.

  Therefore, the titanium dioxide concentration in the measurement object 8a is calculated by comparing the calibration curve graph of FIG. 11B with the count number of the reflected light 4h measured by the photocatalyst meter according to the present invention and the photocatalytic ability measurement method. Can do. These may be compared with the measurement result as a reference value of the photocatalytic capacity, or input in advance into the basic database of the control unit 5s and calculated by the control unit 5s, and the titanium dioxide concentration of the measurement target 8a is displayed on the display unit 5b. May be displayed.

It is a whole schematic diagram of the photocatalyst meter which is the present invention. It is a front view of the sensor head which comprises the photocatalyst meter which is this invention. It is a top view when the indicator storage container is stored in the sensor head. It is a side view of a sensor head. It is a bottom view of a sensor head. It is a rear view of a sensor head. It is a partial exploded front view of a sensor head when the indicator storage container is stored in the sensor head. It is sectional drawing of a sensor head. It is a front view of the main body which comprises the photocatalyst meter which is this invention. It is a rear view of the main body which comprises the photocatalyst meter which is this invention. It is sectional drawing of a sensor head part when measuring a titanium dioxide density | concentration with the photocatalyst meter which is this invention. It is a figure which shows the measurement principle of the photocatalyst meter which is this invention. It is an example of the calibration curve used in order to measure a titanium dioxide density | concentration.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Photocatalyst meter 2 Sensor head 2a Holder 2b 1st through-hole 2c 2nd through-hole 2d 3rd through-hole 2e Notch part 2f Storage part 2g Stopper 2h Contact member 2i Window 2j Screw hole 2k Notch part 3 Indicator storage container 3a Permeability cell 3b Plug 4 Cable 4a UV fiber 4b Laser fiber 4c Light receiving fiber 4e Coating material 4f Ultraviolet 4g Laser 4h Reflected light 5 Measurement body 5a Plug 5b Display unit 5c Main power supply 5d Measurement start switch 5e Interrupt switch 5f UV irradiation start switch 5g UV intensity switch Switch 5h Ultraviolet irradiation port 5i Laser irradiation light receiving port 5j Standby lamp 5k Ventilation fan 5l Fuse
5m 100V insertion part 5n DC 12V insertion part 5o USB port 5p UV generation part 5q Laser generation part 5r Light detection part 5s Control part 5t PC
6 Support body 6a Screw 7 Indicator 8 Material to be coated 8a Measurement object

Claims (6)

An indicator storage container comprising a permeable cell having a slit for inserting an indicator and a stopper for sealing the permeable cell;
A storage part for holding the indicator storage container, a first through hole for inserting a UV fiber for irradiating ultraviolet rays toward the indicator toward the storage part, a second through hole for inserting a laser fiber for irradiating a laser to the storage part Measured at the time of measurement provided with a holder having a third through-hole through which a receiving fiber for receiving the reflected light of the laser is inserted to the housing and a measurement target side of the holder, and a window through which the irradiated ultraviolet light and laser are passed. A sensor head comprising a contact member that contacts the object;
An ultraviolet ray generator that generates ultraviolet rays that pass through the indicator storage container and irradiate a measurement target; a laser generator that generates a laser that is applied to the indicator; a light detector that detects reflected light reflected from the indicator; From the light intensity detected by the light detection unit and the calibration curve data, the concentration of titanium dioxide in the measurement target is calculated, and the control unit that controls the operation of each component, from the display unit that displays the measurement value obtained by the control unit Measuring body,
A UV fiber, a laser fiber, a cable made of a light receiving fiber, each of which passes the reflected light from the ultraviolet ray generation unit, the laser generation unit, the ultraviolet ray, the laser, and the indicator;
A photocatalyst meter comprising:   The photocatalytic meter according to claim 1, wherein the permeable cell is a quartz cell.   The photocatalyst meter according to claim 1 or 2, wherein a support is attached to a screw hole provided in the holder, and the sensor head is fixed during measurement.   An indicator is injected into the measurement target mixed with titanium dioxide, the sealed quartz cell is brought into contact, the quartz cell containing the indicator is transmitted, the measurement target is irradiated with ultraviolet light, and the indicator is irradiated with a laser. It is characterized by detecting the reflected light of the laser and comparing the measured value obtained from the reflected light with a reference value which is the photocatalytic ability of titanium dioxide of known concentration, and measuring the concentration of titanium dioxide in the measurement object Photocatalytic ability measurement method. The quartz cell is an indicator storage container having a slit for inserting an indicator and sealed from a stopper,
A storage part for holding the indicator storage container, a first through hole for inserting a UV fiber for irradiating ultraviolet rays toward the indicator toward the storage part, a second through hole for inserting a laser fiber for irradiating a laser to the storage part Measured at the time of measurement provided with a holder having a third through-hole through which a receiving fiber for receiving the reflected light of the laser is inserted to the housing and a measurement target side of the holder, and a window through which the irradiated ultraviolet light and laser are passed. It is housed in a sensor head made of a contact member that comes into contact with the object,
5. The photocatalyst according to claim 4, wherein ultraviolet light is emitted from the UV fiber, laser is emitted from the laser fiber, reflected light from the indicator is received by the light receiving fiber, and a measurement value is obtained from the reflected light. Ability measurement method.   A storage part for holding an indicator storage container, a first through hole through which a UV fiber for irradiating ultraviolet rays is directed to the storage part toward the indicator, a second through hole through which a laser fiber for irradiating a laser is inserted to the storage part, Measurement target at the time of measurement provided with a holder having a third through-hole through which a light receiving fiber for receiving the reflected light of the laser is inserted to the housing part and a measurement target side of the holder, and a window through which the irradiated ultraviolet light and laser are passed A sensor head used for measurement of photocatalytic ability measurement comprising a contact member in contact with.

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