JPH08159971A - Fluorescence analyzer - Google Patents

Abstract

PURPOSE: To easily perform alignment of an excitation light focal point, supply more fluorescence to a light receiving part and improve analysis accuracy by disposing a side-on type photomultiplier (detector) and a specific concave mirror in parallel to an excitation light optical axis. CONSTITUTION: The fluorescence analyzer 1 consists of a xenon lamp 3 for irradiating the insides of sample chambers 2, 2 with excitation light, a photomultiplier 4 as a detector oppositely disposed in both the sides of the sample chamber 2 interposing its optical axis K between them and a light collecting mirror (concave mirror) 5. The light collecting mirror 5 is composed of a reverse semicylindrical concave mirror having a flat reflection face in the parallel direction to the optical axis K, and collects fluorescence in a wide range in the direction of the optical axis K of the excitation light, which can be supplied to a light receiving part 9 of the long photomul. 4 in the direction of the optical axis K. Thus, alignment of a focal point of the excitation light from the lamp 3 is made easy, more fluorescence can be also collected from the circumference of the focal point, and fluorescence analysis accuracy is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescence analyzer,
More specifically, the present invention relates to a fluorescence analyzer used for measuring the concentrations of sulfur dioxide (SO ₂ ) and nitric oxide (NO, NO _x ) contained in the atmosphere, exhaust gas, and waste water.

[0002]

2. Description of the Related Art As a fluorescence analyzer of this type, for example, a sample chamber into which a sample is introduced, a xenon lamp (excitation light source) for irradiating the sample chamber with excitation light to excite the sample,
It is known that the lamp is composed of a photomultiplier (photomultiplier tube) and a spherical mirror (concave surface), which are arranged on both sides of the sample chamber so as to face each other across the optical axis of the lamp.

[0003]

That is, this Photomul detects fluorescence emitted from an excited sample directly and via the spherical mirror. However, it has been pointed out that this spherical mirror has a narrow region where fluorescence can be collected and it is difficult to adjust the focus of the excitation light from the excitation light source to the narrow region, so that fluorescence is not collected sufficiently in the end.

[0004]

According to the present invention, a sample chamber into which a sample is introduced, an excitation light source for irradiating the sample chamber with excitation light, and a sample chamber are provided on the side of the excitation optical axis. A condenser mirror and a detector arranged outside the sample chamber at a position substantially perpendicular to the excitation optical axis direction and facing the condenser mirror, wherein the condenser mirror excites the excitation light. The detector is a side-on type photomultiplier tube which is composed of an inverted semicircular concave mirror having a flat reflecting surface in a direction parallel to the optical axis, and in which the detector is parallel to the excitation optical axis. It is a fluorescence analyzer characterized by the above.

That is, the present invention utilizes the fact that the light-receiving portion of the side-on type photomultiplier tube is long in the direction of the detection body, and correspondingly, the inverted cambo shape having a flat reflecting surface in the parallel direction. By using a concave concave mirror as a condensing mirror, it is possible to easily adjust the focus of the excitation light from the excitation light source and collect more fluorescence from the periphery of the focus and supply it to the light receiving part, thereby performing fluorescence analysis. It is intended to improve the accuracy of.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the embodiments shown in the drawings. The present invention is not limited to this. 1 and 2, a fluorescence analyzer (1) includes a sample chamber (2) into which a sample is introduced, a xenon lamp (3) as an excitation light source for irradiating the sample chamber with excitation light to excite the sample, and From the photomultiplier (4) and the condensing mirror (5) as detectors, which are arranged facing each other on both sides of the sample chamber (2) across the optical axis (K) of the lamp. Become the main.

Here, the condensing mirror (5) is an inverted chamfered concave mirror having a flat reflecting surface in a direction parallel to the optical axis (K), in other words, a gutter-shaped or half-split cylinder shape. It consists of a concave mirror (see FIG. 3). Here, the curvature of the concave mirror is elliptical. Incidentally, (7) is a condenser lens, (8) is a fluorescence filter, (9) is a light receiving portion, and (10) is an excitation light filter. The photomul (4) is used as a side-on type, and the detection body (6) is parallel to the optical axis (K),
Fluorescence emitted from the excited sample (target component: SO ₂ gas in the atmosphere) is detected directly and via the condenser mirror (5).

Thus, the condenser mirror (5) can collect the fluorescence in a wide range in the optical axis direction of the excitation light and supply it to the light receiving section (9) of the photomultiplier (4) which is also long in the optical axis direction, whereby the xenon lamp. The focus of the excitation light from (3) can be easily adjusted, and more fluorescence can be collected from the periphery of the focus, and the accuracy of fluorescence analysis can be improved. Since the curvature of the concave mirror is elliptical, fluorescence can be supplied to the photomultiplier (4) with high efficiency by setting two focal points at the focal point of the excitation light and the light receiving portion (9) respectively.

Unlike the above embodiment, the curvature of the concave mirror may be parabolic or arcuate.

[0010]

According to the present invention, the focus of the excitation light from the excitation light source is adjusted by disposing the side-on type photomultiplier tube and the specific concave mirror in parallel with the optical axis of the excitation light source. This facilitates and collects more fluorescence from the periphery of the focal point and supplies it to the light receiving portion of the photodetector, thereby improving the accuracy of fluorescence analysis.

[Brief description of drawings]

FIG. 1 is a functional explanatory diagram showing an embodiment of a fluorescence analyzer according to the present invention.

FIG. 2 is a functional explanatory diagram when the embodiment is viewed from another direction.

FIG. 3 is a perspective view of a concave mirror used in an example.

[Explanation of symbols]

 1. Fluorescence analyzer 2. Sample chamber 3. Xenon lamp 4. Photomaru 5. Condensing mirror (concave mirror) 6. Detection body 7. Condensing lens 8. Fluorescent filter 9. Light receiving unit 10. Excitation light filter

Claims (1)

[Claims] 1. A sample chamber into which a sample is introduced, an excitation light source for irradiating the sample chamber with excitation light, a condenser mirror arranged on the side of the excitation optical axis in the sample chamber, and outside the sample chamber. A detector arranged at a position substantially orthogonal to the excitation light axis direction and facing the condenser mirror, wherein the condenser mirror is flat in a direction parallel to the excitation light axis. A fluorescence analysis device comprising an inverted cambo-concave concave mirror having a reflective surface, wherein the detector is a side-on type photomultiplier tube having a detection body parallel to the excitation optical axis.