JP2016125826A - Analysis device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a cell to be irradiated with light that is appropriate for various kinds of measurement objects without scaling up device configuration.SOLUTION: An analysis device 100 for analyzing a measurement object on the basis of light intensity detected by a light detection unit 30, comprises a cell 10 for accommodating a measurement object, a light emission unit 20 for irradiating the cell 10 with light, and a light detection unit 30 for detecting light having passed through the cell 10. The light emission unit 20 is provided with: a plurality of light sources 21; an optical lens 22 for parallelizing light emitted from each light source 21 and provided in the plurality of light sources 21; a light guide member 24 for emitting light incident from a light incidence end 241 from a light emission end 242 and guiding the light to the cell 10; and a concave mirror 23 for reflecting a plurality of parallel beams parallelized by the optical lens 22 and condensing the beams at the light incidence end 241.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an analyzer for analyzing a measurement object accommodated in a cell.

  For example, as shown in Patent Document 1, this type of analyzer includes a cell that accommodates a measurement target, a light source that irradiates light to the cell, and a photodetector that detects light that has passed through the cell. One that analyzes the measurement object based on the light intensity obtained by the photodetector is known.

More specifically, this analyzer needs to irradiate light of various wavelengths according to the measurement target, so a halogen lamp is used as a light source and the cell is configured to irradiate white light having a wide wavelength. Has been.
However, in the above-described configuration, the filament of the halogen lamp or the like is consumed as it is used, thereby changing the wavelength distribution, light intensity, and the like of the light irradiated to the cell, which may cause measurement errors.

Therefore, there is an analyzer using an LED light source that can be used more stably as a light source than a halogen lamp.
Specifically, for example, a plurality of LED light sources that emit light of different wavelengths are provided, and light emitted from each LED light source is transmitted through, for example, an optical fiber to irradiate the cell.

  However, the above-described configuration requires, for example, an LED light source or a switching mechanism for switching an optical fiber provided corresponding to each LED light source in order to change the wavelength of light applied to the cell, and the entire apparatus becomes much larger accordingly. .

JP 59-153132 A

  Therefore, the present invention has been made to solve the above-described problems, and its main problem is to irradiate a cell with light according to various measurement objects without making the apparatus large. .

  That is, the analysis apparatus according to the present invention includes a cell that accommodates a measurement target, a light emitting unit that irradiates light to the cell, and a light detection unit that detects light that has passed through the cell, and the light detection unit. The analysis device analyzes the measurement object based on the light intensity detected by the light source, wherein the light emitting unit is provided corresponding to the plurality of light sources and the plurality of light sources, and emitted from each of the light sources. An optical system that collimates the light; a light guide member that emits light incident from the light incident end from the light exit end to guide the cell; and a plurality of parallel lights collimated by the optical system to reflect the light. And a concave mirror for condensing light at the light exit end.

In such an analyzer, since the concave mirror condenses a plurality of parallel lights collimated by the optical system on the light incident end of the light guide member, the light emitted from each light source by the light guide member is collected at once. Thus, it is possible to irradiate the cell with light according to various measurement objects without using a switching mechanism.
In addition, the wavelength and the amount of light guided to the cell can be appropriately changed by controlling ON / OFF of each light source for switching.

In order to irradiate the cell with light having a wide wavelength such as white light, it is preferable that the light sources emit light having different wavelengths.
If it is such, the light of a different wavelength radiate | emitted from each light source can be mixed, and the light of a wide wavelength can be irradiated to a cell.

It is preferable that the light emitted from each of the light sources is irradiated at equal intervals along the circumferential direction around the center of the concave mirror with respect to the concave mirror.
If it is such, the design of a light emission mechanism and the positioning of each light source can be performed easily.

  As a specific embodiment, the concave mirror is a parabolic mirror, the parallel light collimated by the optical system is parallel to the axis of the parabolic mirror, and the light incident end is the paraboloid. The thing provided on the axis | shaft of a surface mirror is mentioned.

The light emission mechanism according to the present invention includes a cell that accommodates a measurement object and a light detection unit that detects light that has passed through the cell, and the light emission mechanism is based on the light intensity detected by the light detection unit. A light emission mechanism that is used in an analysis apparatus that analyzes a measurement object and that irradiates light to the cell. The light emission mechanism is provided corresponding to a plurality of light sources, and the light emitted from each of the light sources. A collimating optical system; a light guide member that emits light incident from a light incident end to the cell and that guides the light to the cell; and a plurality of parallel lights collimated by the optical system are reflected and the light incident is performed. And a concave mirror that collects light at the end.
With such a light emission mechanism, it is possible to obtain the same effect as the above-described analyzer.

  According to the present invention configured as described above, it is possible to irradiate a cell with light according to various measurement objects without making the apparatus large, and it is possible to analyze various measurement objects with a simple configuration. become.

The schematic diagram which shows the whole structure of the analyzer of this embodiment. The schematic diagram which shows the light emission part of the embodiment. The schematic diagram which shows the reflective surface of the concave mirror of the embodiment. The schematic diagram which shows the position of the optical member in deformation | transformation embodiment.

  Hereinafter, an embodiment of an analysis apparatus 100 according to the present invention will be described with reference to the drawings.

  The analyzer 100 according to the present embodiment irradiates the cell 10 containing the measurement target with light, and, for example, spectroscopically analyzes the light that has passed through the cell 10 to measure the absorbance or light transmission of the measurement target. The rate is analyzed qualitatively or quantitatively.

  Specifically, as shown in FIG. 1, the analyzer 100 includes a cell 10 that contains a measurement target such as a gas or a liquid, a light emitting unit 20 that irradiates the cell 10 with light, and light that has passed through the cell 10. The light detection part 30 to detect and the arithmetic unit 40 which analyzes a measuring object based on the light intensity detected by the light detection part 30 are comprised.

  First, the light detection unit 30 will be described.

  As shown in FIG. 1, the light detection unit 30 of the present embodiment includes an optical fiber that is a light guide member 31 that transmits light transmitted through a measurement target in the cell 10, and light transmitted by the light guide member 31. A spectroscope 33 that splits the light and a condensing lens 32 that condenses the light emitted from the light guide member 31 and guides the light to the spectroscope 33 are provided.

As shown in FIG. 1, the spectroscope 33 includes an incident slit 331 on which the light collected by the condenser lens 32 is incident, and a first concave mirror (collimator mirror) that converts the light incident from the incident slit 331 into a parallel light flux. 332, a diffraction grating 333 that receives the parallel light beam from the first concave mirror 332 and separates the light for each wavelength, and a second concave mirror (camera mirror) 334 that collects light of each wavelength dispersed by the diffraction grating 333, And a multi-channel detector 335 for detecting light of each wavelength collected by the second concave mirror 334.
Note that the arrangement and number of the optical devices described above are not limited to those shown in FIG. 1, and may be changed as appropriate.

  The computing device 40 calculates the absorbance spectrum of the measurement target from, for example, the spectral spectrum obtained by the photodetector 335 and the reference spectrum obtained in advance, and uses this absorbance spectrum to determine the concentration of the component included in the measurement target. Is calculated.

  Next, the light emission part 20 which is the characteristic part of this embodiment is demonstrated.

As shown in FIGS. 1 and 2, the light emitting unit 20 of the present embodiment is provided corresponding to each of the light sources 21 and each light source 21, and an optical system that collimates the light emitted from each light source 21. The optical lens 22, the concave mirror 23 that reflects the parallel light collimated by the optical lens 22, and the light reflected by the concave mirror 23 is incident from the light incident end 241 and emitted from the light exit end 242, and the cell 10. And a light guide member 24 for guiding the light.
A part of the light source 21, the optical lens 22, the concave mirror 23, and the light guide member 24 are accommodated in the housing 25.

The light sources 21 are LEDs that emit light having different wavelengths, and are arranged such that the optical axes of the light emitted from the light sources 21 are parallel to each other.
In the present embodiment, for example, four light sources 21 are arranged at equal intervals on the same circumference along the circumferential direction around a predetermined central axis. The central axis coincides with a rotation axis C of the concave mirror 23 described later, and is set so that the focal point F of the concave mirror 23 is located on the central axis.

The optical lens 22 is provided on the light emission side of each light source 21 corresponding to each light source 21, and collimates the light emitted from each light source 21, and is specifically a collimating lens.
The plurality of lights emitted from the plurality of light sources 21 by the optical lens 22 become different parallel lights.

In the present embodiment, the light source 21 and the optical lens 22 corresponding to the light source 21 are housed in the same housing case 26, and the parallel light collimated by each optical lens 22 in the housing case 26. These optical axes are fixed so as to be parallel to each other.
The distance between the light source 21 and the optical lens 22 corresponding to the light source 21 is adjusted so that the light source 21 is located at the focal point of the optical lens 22.
The housing case 26 is detachably attached to the casing 25 described above with screws 27 or the like.

The concave mirror 23 is provided on the light exit side of each optical lens 22 and reflects the parallel light collimated by each optical lens 22 toward the focal point F with the inside of the curved curved surface as the reflection surface 231. It is.
More specifically, the concave mirror 23 of the present embodiment is a parabolic mirror obtained by rotating a parabola around the rotation axis C, and condenses light incident parallel to the rotation axis C at the focal point F. It is configured.
In the present embodiment, the concave mirror 23 is housed in the housing 25 together with the light source 21 and the optical lens 22 described above, and in the housing 25, the rotation axis C and the above-described central axis coincide with each other. It is fixed to. That is, the concave mirror 23 of the present embodiment is fixed and accommodated in the housing 25 so that the rotation axis C and the optical axis of the parallel light applied to the reflecting surface 231 are parallel to each other.

  With the above-described configuration, the light emitted from each light source 21 is converted into parallel light by the optical lens 22 and directly irradiated onto the concave mirror 23, and as shown in FIG. 3, the circumferential direction around the center O of the concave mirror 23. Are irradiated at equal intervals along the line.

As shown in FIG. 2, the light guide member 24 is an optical fiber having one end as a light incident end 241 and the other end as a light exit end 242, and the light exit end 242 is provided in the vicinity of the cell 10 described above. The cell 10 is configured to irradiate the cell 10 with the light incident on the incident end 241 via the light emitting end 242.
Further, a part of the light emitting end side of the light guide member 24 is provided in the casing 25. In the present embodiment, along the rotation axis C described above, that is, along the central axis of each light source 21. Are arranged.

  In the present embodiment, the light incident end 241 of the light guide member 24 described above is provided at the focal point F of the concave mirror 23.

More specifically, the light incident end 241 is provided on the rotational axis C of the concave mirror 23 at a position where substantially all of the parallel light reflected by the reflecting surface 231 of the concave mirror 23 is collected.
That is, the light guide member 24 of the present embodiment is disposed so that the focal point F of the concave mirror 23 is located on the light incident end face.

According to the analysis apparatus 100 according to the present embodiment configured as described above, the light incident end 241 of the light guide member 24 is provided at the focal point F of the concave mirror 23. The emitted light can be guided to the cell 10 all at once, and it becomes possible to irradiate the cell 10 with light of various wavelengths without using a switching mechanism.
Thereby, various measuring objects can be analyzed with a simple configuration without making the entire analyzer 100 large.

  Further, since the light sources 21 emit light having different wavelengths, the light having different wavelengths is mixed by the light guide member 24 and emitted from the light emitting end 242, and has a broad wavelength such as white light. Light can be irradiated to the cell.

  Furthermore, since the light source 21 and the optical lens 22 are fixed in the housing case 26 so that the optical axes of the parallel lights collimated by the optical lenses 22 are parallel to each other, it is necessary to adjust the position of the optical device. Time can be shortened.

  The present invention is not limited to the above embodiment.

For example, in the embodiment, the light incident end 241 of the light guide member 24 is provided at the focal point F of the concave mirror 23, but may be provided near the focal point F as shown in FIG.
More specifically, the light incident end 241 may be located at a position where substantially all of the light reflected and collected by the concave mirror 23 is incident. Specifically, the light incident end surface P is in the upper part of FIG. As shown in the lower part of FIG. 4, the concave mirror 23 moves from the focal point F of the concave mirror 23 to a predetermined distance d from the focal point F of the concave mirror 23 along the rotational axis C of the concave mirror 23 in the light emission direction. It suffices if it is between a position separated by a predetermined distance d in the direction opposite to the light emission direction along the rotation axis C of 23.
Note that the concave mirror reflecting a plurality of parallel lights and condensing them at the light incident end does not necessarily require all of the reflected parallel light to be incident on the light incident end 241, for example, at least one of the reflected parallel lights. And guiding the portion to the light incident end 241.

  In the embodiment, the concave mirror reflects the same number of parallel lights as the number of light sources and guides it to the light incident end. However, the concave mirror reflects and guides a plurality of parallel lights smaller than the number of light sources to the light incident end. May be.

  Moreover, although the concave mirror of the said embodiment was a parabolic mirror, an ellipsoidal mirror, a spherical mirror, etc. may be sufficient.

Furthermore, the light sources of the above embodiments emit light having different wavelengths, but all or some of the light sources may emit light having the same wavelength.
If it is this, the light intensity of a specific wavelength can be improved among the lights irradiated to a cell.

In addition, the concave mirror of the above-described embodiment is provided at a position where the parallel light emitted from the optical lens is directly irradiated. For example, the parallel light emitted from the optical lens passes through a reflecting plate or a glass plate. It may be provided at a position irradiated after being reflected or refracted through.
With this configuration, the relative position between each light source and the concave mirror can be appropriately changed.

  In addition, in the above embodiment, a plurality of optical lenses are provided on the light emission side of each light source. However, the optical lenses provided on the light emission side of each light source may be integrated.

  In addition, the light sources are arranged at regular intervals along the circumferential direction around a predetermined central axis, but only some of the light sources may be regularly arranged, or each light source is irregularly arranged. May be.

  In addition, it goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Analytical apparatus 10 ... Cell 20 ... Light emission part 30 ... Light detection part 21 ... Light source 22 ... Optical lens 23 ... Concave mirror 231 ... Reflective surface 24 ... -Light guide member 241 ... Light incident end 242 ... Light exit end F ... Focus

Claims (5)

A cell containing a measurement object; a light emitting unit that irradiates the cell with light; and a light detection unit that detects light that has passed through the cell; based on the light intensity detected by the light detection unit An analyzer for analyzing the measurement object,
The light emitting part is
Multiple light sources;
An optical system that is provided corresponding to the plurality of light sources, and that collimates the light emitted from each of the light sources;
A light guide member that emits light incident from the light incident end to the cell and exits from the light exit end;
An analysis apparatus comprising: a concave mirror that reflects a plurality of parallel lights collimated by the optical system and focuses the light on the light incident end.   The analyzer according to claim 1, wherein each of the light sources emits light having different wavelengths.   3. The analyzer according to claim 1, wherein the light emitted from each of the light sources is irradiated at equal intervals along a circumferential direction around a center of the concave mirror with respect to the concave mirror. The concave mirror is a parabolic mirror;
The parallel light collimated by the optical system is parallel to the axis of the parabolic mirror,
The analyzer according to any one of claims 1 to 3, wherein the light incident end is provided on an axis of the parabolic mirror. A cell containing a measurement object; and a light detection unit that detects light that has passed through the cell; and used in an analyzer that analyzes the measurement object based on light intensity detected by the light detection unit; A light emitting mechanism for irradiating the cell with light,
Multiple light sources;
An optical system that is provided corresponding to the plurality of light sources, and that collimates the light emitted from each of the light sources;
A light guide member that emits light incident from the light incident end to the cell and exits from the light exit end;
A light emitting mechanism comprising: a concave mirror that reflects a plurality of parallel lights collimated by the optical system and focuses the light on the light incident end.