JP5296034B2 - Photodetector and sample holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photodetector which uses a sample holder suitable when a sample is irradiated with excitation light at different angles using an identical integrating sphere. <P>SOLUTION: The sample holder 40, which is attachably/detachably mounted to the integrating sphere 20 which observes light to be measured reflected by the sample S irradiated with excitation light, includes a sample stand 41 which extends inside the integrating sphere 20 from a sample introducing hole 202 which introduces the sample S in the integrating sphere 20, and a mounting flange 44 for latching the sample holder 40 together onto the integrating sphere 20. A placement surface 411, on which the sample S is placed, is formed on the sample stand 41 so as to incline from a surface perpendicular to the optical axis L of the excitation light. The mounting flange 44 latches the sample holder 40 together onto the integrating sphere 20 so that the placement surface 411 is oriented in a predetermined direction inside the integrating sphere 20. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a light detection apparatus using a sample holder that is detachably attached to an integrating sphere for observing light to be measured reflected by a sample irradiated with excitation light.

  An integrating sphere is used to measure the intensity of the light to be measured when the light to be measured is emitted radially. The integrating sphere is coated with a high diffuse reflection powder on the inner wall of the spherical body, and when the light to be measured is emitted radially from the sample, it is multiple diffusely reflected by the high diffuse reflection powder. The diffusely reflected light is incident on the photodetector, the output signal thereof is guided to the optical intensity meter, and the intensity of the light to be measured emitted can be measured. An example of such an integrating sphere is disclosed in FIG.

JP 2004-309323 A

  In the integrating sphere disclosed in FIG. 5 of Patent Document 1, the angle formed by the stage on which the sample is placed and the optical axis of the excitation light is fixed. In such an integrating sphere, for example, when it is necessary to change the angle according to the type of the sample, the position and angle of the hole for introducing the excitation light must be changed. Therefore, it is necessary to prepare an optimal integrating sphere for each sample, and it is practically extremely difficult to use the optimal integrating sphere for all samples in consideration of cost and labor.

  Therefore, an object of the present invention is to provide a light detection apparatus using a sample holder suitable for irradiating a sample with excitation light at different angles using the same integrating sphere.

An optical detection apparatus according to the present invention is mounted on an integrating sphere for observing light to be measured reflected by a sample irradiated with excitation light, a sample holder that is detachably attached to the integrating sphere, and a sample holder An excitation light source for supplying excitation light to be irradiated on the sample and a photodetector for detecting light to be measured from the sample are provided. The sample holder is inserted into the integrating sphere from the sample introduction hole for introducing the sample into the integrating sphere. extending a sample stage, the sample stage are made form the mounting surface for placing the sample, so that the mounting surface is oriented in a predetermined direction in the integrating sphere, the sample holder integrating sphere The sample stage has a positioning part for positioning the sample on the mounting surface, and the positioning part is composed of a plurality of convex parts, and is mounted on the sample. as a gap between the surface, Turkey to position the sample The features. The sample holder according to the present invention is a sample holder that is detachably attached to an integrating sphere for observing the light to be measured reflected by the sample irradiated with excitation light, and the sample is introduced into the integrating sphere. A sample stage extending into the integrating sphere from the introduction hole, and a locking portion for locking the sample holder to the integrating sphere, and a mounting surface for mounting the sample is formed on the sample stage, The locking part is configured to lock the sample holder to the integrating sphere so that the mounting surface is oriented in a predetermined direction in the integrating sphere, and the sample stage holds the sample on the mounting surface. The positioning portion includes a plurality of convex portions, and the sample is positioned so that a gap is formed between the sample and the mounting surface. . In such a light detection apparatus and sample holder, a configuration may be adopted in which the mounting surface on which the sample is mounted is formed on the sample stage so as to be inclined from a plane perpendicular to the optical axis of the excitation light.

  According to the present invention, the integrating sphere is provided with a sample stage having a mounting surface formed so as to be inclined from a plane perpendicular to the optical axis of the excitation light, and the mounting surface is oriented in a predetermined direction. Therefore, the sample placed on the placement surface can be arranged at a predetermined angle with respect to the optical axis of the excitation light. Since the predetermined angle depends on the inclination of the mounting surface, for example, when measuring a plurality of types of samples by changing the predetermined angle, it can be handled by changing the sample stage. The sample holder is locked to the integrating sphere in order to lock the sample holder to the integrating sphere so that the mounting surface of the sample stage is oriented in a predetermined direction in the integrating sphere. It is preferable to have a locking part.

  In the light detection apparatus according to the present invention, the sample stage has a positioning part for positioning the sample on the placement surface, and the positioning part preferably includes a plurality of convex parts. Since it has the positioning part which consists of a some convex part, the sample arrange | positioned on the inclined mounting surface can be hold | maintained in an appropriate position.

  In the light detection apparatus according to the present invention, it is also preferable that the plurality of convex portions have a structure capable of positioning a rectangular sample and a circular holding member that holds the sample. The sample to be measured may have a rectangular shape, and may be arranged on a circular holding member. Therefore, more types of samples can be obtained by using a structure that can position both of them. It can correspond to.

  In the light detection device according to the present invention, it is also preferable that the mounting surface has a concave portion inside the positioning portion. Since the concave portion is formed on the inner side of the positioning portion, the contact area between the sample and the mounting surface can be reduced when the sample is mounted on the mounting surface. Therefore, for example, even when another sample adheres to the mounting surface, the influence can be reduced as much as possible.

  According to the present invention, the angle between the optical axis of the excitation light and the mounting surface depends on the inclination of the mounting surface. For example, when measuring a plurality of types of samples by changing the angle, It can respond by changing.

It is sectional drawing which shows the photon detection apparatus using the sample holder which concerns on this embodiment. It is sectional drawing which shows the photon detection apparatus using the sample holder which concerns on this embodiment. It is an expanded sectional view of FIG. It is an expanded sectional view of FIG. It is a disassembled perspective view of a sample holder. It is a top view which shows the mounting surface of a sample holder. It is a top view which shows the modification of a mounting surface. It is sectional drawing which shows the modification of a sample stand.

  The knowledge of the present invention can be easily understood by considering the following detailed description with reference to the accompanying drawings shown for illustration only. Subsequently, embodiments of the present invention will be described with reference to the accompanying drawings. Where possible, the same parts are denoted by the same reference numerals, and redundant description is omitted.

  A sample holder according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a cross section along the optical axis of the excitation light of a light detection apparatus using the sample holder of the present embodiment. FIG. 2 is a cross-sectional view taken along the optical axis of the excitation light and perpendicular to the cross-section shown in FIG.

  1 and 2 includes an integrating sphere 20 attached to a gantry 10, an optical fiber holder 30 for excitation light, a sample holder 40, and an optical fiber holder 50 for light detection. . The integrating sphere 20 is attached to the gantry 10 with a mounting screw 102.

  The integrating sphere 20 is formed with an excitation light introduction hole 201, a sample introduction hole 202, a photodetector introduction hole 203, and a light shielding plate 204. The excitation light introducing hole 201 is a hole into which the excitation light optical fiber holder 30 is inserted and attached. The sample introduction hole 202 is a hole into which the sample holder 40 is inserted and attached. The photodetector introduction hole 203 is a hole into which the optical fiber holder 50 for light detection is inserted and attached.

  The excitation light introducing hole 201 is formed on one of the poles (the upper pole in the figure) where the integrating sphere 20 and the vertical line intersect. The sample introduction hole 202 is formed on the pole opposite to the excitation light introduction hole 201 (the lower pole in the figure). The photodetector introduction hole 203 is on a meridian having both the position where the excitation light introduction hole 201 is formed and the position where the sample introduction hole 202 is formed, and is equidistant from both the poles. Is formed. The light shielding plate 204 is formed between the sample introduction hole 202 and the photodetector introduction hole 203.

  An optical fiber (not shown) attached to the fiber holder 301 of the excitation light optical fiber holder 30 is connected to an excitation light source (not shown). Excitation light emitted from an excitation light source (not shown) is guided to the lens 302 of the excitation light optical fiber holder 30 through an optical fiber (not shown). The excitation light is applied to the sample S placed on the sample holder 40 disposed opposite to the excitation light optical fiber holder 30.

  The light to be measured reflected by the sample S irradiated with the excitation light is subjected to multiple diffuse reflection by the high diffuse reflection powder applied to the inner wall of the integrating sphere 20. This diffusely reflected measurement light is incident on an optical fiber 501 attached to the light detection optical fiber holder 50. The optical fiber 501 is connected to a photodetector (not shown). Therefore, the light to be measured incident on the optical fiber 501 is guided to a multichannel photodetector (not shown) through the optical fiber 501. Measurement data detected by a multi-channel photodetector (not shown) is output to a data processing device (not shown) for data processing, and the intensity of the light under measurement is measured.

  The light shielding plate 204 is provided to prevent the light to be measured from the sample S from directly entering the optical fiber 501. This is because when the light to be measured is directly incident on the optical fiber 501, a significant error occurs in the intensity data of the light to be measured.

  Next, the sample holder 40 will be described with reference to FIGS. FIG. 3 is an enlarged cross-sectional view of the vicinity of the sample holder 40 in FIG. FIG. 4 is an enlarged cross-sectional view of the vicinity of the sample holder 40 in FIG.

  The sample holder 40 includes a sample stage 41, a handling knob 42, a holder main body 43, and an attachment flange 44 (locking portion). A sample S is placed on the placement surface 411 of the sample stage 41. As shown in FIG. 3, the mounting surface 411 is formed so as to be inclined from a plane perpendicular to the optical axis L of the excitation light. The sample stage 41 is held between the holder main body 43 and the handling knob 42. The holder main body 43 to which the sample stage 41 and the handling knob 42 are attached is inserted into the attachment flange 44. As shown in FIG. 4, a fixing projection 101 extending from the gantry 10 is inserted into the mounting flange 44, and a fixing screw 45 is provided on the side opposite to the inserted portion. When the fixing screw 45 is tightened, the holder main body 43 is sandwiched and fixed between the fixing protrusion 101 and the fixing screw 45.

  The sample holder 40 will be described in more detail. FIG. 5 is an exploded perspective view of the sample holder 40. The holder main body 43 includes a cylindrical tube portion 431 and a flange portion 432 provided at one end of the tube portion 431. A positioning notch 432a is formed in the collar portion 432. The flange portion 432 is also formed with a screw hole 432b for attaching the handling knob 42. Folded portions (not shown) are formed at the multi-ends of the cylindrical portion 431, and the sample table 41 is sandwiched and fixed with the handling knob 42.

  The handling knob 42 includes a first collar part 421, a second collar part 422, a small diameter part 423, and a large diameter part 424. The small diameter portion 423 has a cylindrical shape and is formed between the first flange portion 421 and the second flange portion 422. The large diameter portion 424 has a cylindrical shape and is formed to extend from the second flange portion 422 to the opposite side to the small diameter portion 423. The first flange 421 is a part for fixing the sample table 41 with the holder main body 43 therebetween. The second flange 422 is provided with a hole 422 a at a position corresponding to the screw hole 432 of the holder main body 43. Accordingly, when the sample base 41 is sandwiched and the holder main body 43 and the handling knob 42 are screwed together, the sample base 41, the holder main body 43, and the handling knob 42 can be fixed to each other. In addition, since the O-ring 46 is disposed between the sample stage 41 and the handling knob 42, the sample stage 41 can be prevented from rotating with respect to the handling knob 42.

  The mounting flange 44 has a flange main body 441 and a fixing screw 45. The flange body 441 is provided with positioning pins 441b. The positioning pin 441 b is provided at a position corresponding to the positioning notch 432 a of the holder main body 43. Therefore, when the cylindrical portion 431 of the holder main body 43 is inserted into the flange main body 441, the positioning pins 441b are inserted into the positioning notches 432a, and the holder main body 43 is positioned with respect to the flange main body 441. A fixing hole 441a is formed on the side opposite to the position where the fixing screw 45 is provided. The fixing hole 441a is a hole into which the above-described fixing protrusion 101 is inserted.

  The sample stage 41 will be described with reference to FIG. FIG. 6 is a plan view of the sample stage 41 as viewed from the placement surface 411 side. In FIG. 6, it is assumed that the upper side of the drawing is a portion where the placement surface 411 is high, and the lower side of the drawing is a portion where the placement surface 411 is low. On the mounting surface 411, positioning portions 412 are formed at four locations. Concave portions 413 are formed on the mounting surface 411 inside the positioning portions 412 formed at the four locations.

  The positioning portions 412 are arranged in the vicinity of the outer periphery of the circular mounting surface 441 so as to be equidistant from each other. Each positioning part 412 has a convex part 412a and a concave part 412b surrounded by the convex part 412a. The positioning portion 412 is formed by forming a prismatic protrusion, making a cylindrical hole in the center of the prismatic protrusion, and cutting out one corner of the prismatic protrusion. A portion cut out in each positioning portion 412 is formed so as to face the center direction of the placement surface 411.

  Therefore, when the sample S has a rectangular shape as illustrated, the four corners of the sample S enter the concave portions 412b of the positioning portions 412 and are held by the convex portions 412a. Further, when the sample is put in the holding member S2 such as a circular petri dish, the sample is held by the positioning portions 412 formed at four places, like the rectangular sample.

  When the sample S is a rectangular glass substrate coated with a light emitting material, a part of the photons emitted from the light emitting material propagates through the glass substrate as an optical waveguide and is emitted from the end face. Therefore, when the form of the positioning portion 412 as in the present embodiment is adopted, the contact portion between the sample S and the positioning portion 412 can be reduced, and the photons emitted from the end surface of the sample S can be more accurately detected. Can be measured.

  Even if the light emitting material is attached to the mounting surface 411 side of the sample S, the concave portion 413 is formed on the mounting surface 411, so that the light emitting material is attached to the mounting surface 411. Can be suppressed. Moreover, since the positioning part 412 is also provided with the recessed part 412b, adhesion of the luminescent material to the positioning part 412 can also be suppressed.

  A modification of the positioning portion 412 is shown in FIG. In the sample table 71 shown in FIG. 7A, a pair of positioning portions 412 are formed on the placement surface 711, and one protrusion 712 is formed. The pair of positioning portions 412 and the protrusions 712 are arranged in the vicinity of the outer periphery of the circular mounting surface 441 so as to be equidistant from each other.

  A sample table 72 shown in FIG. 7B has a pair of positioning portions 412 formed on the mounting surface 721. The pair of positioning portions 412 are provided at positions corresponding to the lower two locations of the four positioning portions 412 in FIG. Since the mounting surface 721 is inclined so that the upper side in the drawing is high and the lower side in the drawing is low, the sample S (holding member S2) can be held by the two positioning portions 412.

  Further, as described with reference to FIG. 6, the sample S can be prevented from coming into contact with the mounting surface 411 other than the mode in which the concave portion 413 is formed on the mounting surface 411. One example will be described with reference to FIG. FIG. 8 is a cross-sectional view of a sample stage for showing an example thereof.

  The example shown in FIG. 8A shows a sample table 81 in which the shapes of the four positioning portions 412 of the sample table 41 described with reference to FIG. 6 are changed. 8A is a cross-sectional view of the vicinity of the positioning portion 812 formed on the mounting surface 811 of the sample table 81. FIG. As shown to (a) of FIG. 8, the positioning part 812 has the convex part 812a and the recessed part 812b enclosed by the convex part 812a. The concave portion 812b is in a state of being recessed with respect to the convex portion 812a, but is protruding from the placement surface 811. Therefore, when the sample S is arranged so as to be placed on each positioning portion 812, the sample S is held in a state where it rides on the concave portion 812 b of each positioning portion 812, and a gap is formed between the placement surface 811.

  The example shown in FIG. 8B shows a sample stage 82 in which the shapes of the positioning portion 412 and the protrusion 712 of the sample stage 71 described with reference to FIG. 8B is a cross-sectional view of the vicinity of the protrusion 813 (near the center of the sample table 81) formed on the mounting surface 821 of the sample table 81. FIG. As shown in FIG. 8B, the positioning portion 812 has the same shape as that described with reference to FIG. Further, the protrusion 813 is formed to have the same height as the concave portion 812b of the positioning portion 812 with reference to the mounting surface 821. Accordingly, when the sample S is disposed so as to be placed on each positioning portion 812 and is disposed so as to ride on the protrusion 813, the sample S is held and placed on the recess 812b and the protrusion 813 of each positioning portion 812. A gap is formed between the surface 811.

  The effect of this embodiment is demonstrated. The sample holder 40 of the present embodiment includes a sample stage 41 having a mounting surface 411 formed so as to be inclined from a surface perpendicular to the optical axis L of the excitation light, and the mounting surface 411 is directed in a predetermined direction. Since the mounting flange 44 that is engaged with the integrating sphere 20 is provided, the sample S placed on the placement surface 411 can be arranged at a predetermined angle with respect to the optical axis L of the excitation light. . Therefore, the excitation light is incident on the sample S obliquely, and the reflected measurement light does not return to the excitation light introduction hole 201. Further, since the predetermined angle depends on the inclination of the mounting surface 411, for example, when measuring a plurality of types of samples by changing the predetermined angle, it is possible to cope with the problem by changing the sample stage 41. In addition, since the sample holder 40 is fixed by the mounting flange 44 so that the mounting surface 411 is oriented in a predetermined direction, the light to be measured reflected by the sample S is always directed to a predetermined portion in the integrating sphere 20. Irradiation is performed, and errors in measurement values can be reduced.

  INDUSTRIAL APPLICABILITY The present invention can be used as a light detection device using a sample holder suitable for irradiating a sample with excitation light at different angles using the same integrating sphere.

  DESCRIPTION OF SYMBOLS 1 ... Photodetection device, 10 ... Mount, 20 ... Integrating sphere, 30 ... Optical fiber holder for excitation light, 40 ... Sample holder, 50 ... Optical fiber holder for light detection 50, 41 ... Sample stand, 42 ... Handling knob, 43 ... Holder body, 44 ... Mounting flange.

Claims (16)

An integrating sphere for observing the light to be measured reflected by the sample irradiated with the excitation light;
A sample holder detachably attached to the integrating sphere,
An excitation light source for supplying the excitation light irradiated on the sample placed on the sample holder;
A photodetector for detecting the light to be measured from the sample;
The sample holder has a sample stage extending into the integrating sphere from a sample introduction hole for introducing the sample into the integrating sphere,
Wherein the sample stage are made mounting surface shape for placing the sample,
It is configured to lock the sample holder to the integrating sphere so that the placement surface is oriented in a predetermined direction in the integrating sphere ,
The sample stage has a positioning portion for positioning the sample on the placement surface, and the positioning portion is composed of a plurality of convex portions, between the sample and the placement surface. as a gap, the light detecting apparatus characterized that you position the sample. Mounting surface before said sample stage for placing the sample, the light detecting device according to claim 1, characterized that they are being formed so as to incline from the surface perpendicular to the optical axis of the excitation light . Wherein the plurality of protrusions, the light detecting device according to claim 1 or 2, characterized by having a structure positionable a circular holding member for holding the rectangular of the sample and the sample. The photodetection device according to any one of claims 1 to 3 , wherein the placement surface has a recess inside the positioning portion.   The light according to any one of claims 1 to 4, wherein the positioning portion has a concave portion that is recessed with respect to the convex portion and that protrudes from the placement surface. Detection device.   6. The light detection according to claim 5, wherein the placement surface of the sample stage is provided with a protrusion having the same height as the recess of the positioning portion with respect to the placement surface. apparatus.   The positioning portion is formed by forming a prismatic protrusion, making a cylindrical hole in the center of the prismatic protrusion, and cutting out one corner of the prismatic protrusion. Item 7. The light detection device according to any one of Items 1 to 6.   The photodetecting device according to claim 7, wherein the portion cut out in the positioning portion is formed so as to face the center direction of the placement surface.   A sample holder detachably attached to an integrating sphere for observing light to be measured reflected by a sample irradiated with excitation light,
  A sample stage extending into the integrating sphere from a sample introduction hole for introducing the sample into the integrating sphere, and a locking portion for locking the sample holder to the integrating sphere,
  A mounting surface for mounting the sample is formed on the sample stage,
  The locking portion is configured to lock the sample holder to the integrating sphere so that the mounting surface is oriented in a predetermined direction in the integrating sphere,
  The sample stage has a positioning portion for positioning the sample on the placement surface, and the positioning portion is composed of a plurality of convex portions, between the sample and the placement surface. A sample holder, wherein the sample is positioned so that a gap is formed.   The sample holder according to claim 9, wherein the placement surface on which the sample is placed is inclined on the sample stage so as to be inclined from a surface perpendicular to the optical axis of the excitation light.   The sample holder according to claim 9 or 10, wherein the plurality of convex portions have a structure capable of positioning the rectangular sample and a circular holding member for holding the sample.   The sample holder according to any one of claims 9 to 11, wherein the placement surface has a recess inside the positioning portion.   The sample according to any one of claims 9 to 12, wherein the positioning portion has a concave portion that is recessed with respect to the convex portion and that protrudes from the placement surface. holder.   14. The sample holder according to claim 13, wherein the placement surface of the sample stage is provided with a protrusion having the same height as the concave portion of the positioning portion on the basis of the placement surface. .   The positioning portion is formed by forming a prismatic protrusion, making a cylindrical hole in the center of the prismatic protrusion, and cutting out one corner of the prismatic protrusion. Item 15. The sample holder according to any one of Items 9 to 14.   The sample holder according to claim 15, wherein the portion cut out in the positioning portion is formed so as to face the center direction of the placement surface.

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