JPH0688749A - Spectroscope - Google Patents

Abstract

PURPOSE:To collimate a spectroscope with an external object with ease and accuracy. CONSTITUTION:An incident side slit 3 and/or outgoing side slit 10 formed at a spectroscope 2 consists of both an auxiliary light source 21 having low directivity and a slit main body 20. At spectrometry, the slit main body 20 is made to face the first window 34 and/or the second window 35, and at collimation of incident and/or outgoing light paths before spectrometry, positioning means 27, 29a and 29b are provided which make the auxiliary light source 21, in place of the slit main body 20, face the first window 34 and/or the second window 35 so that it is situated at the other focal point against the focal point situated at the object.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectroscope, and more particularly to a Czerny-Turner type spectroscope capable of easily and accurately aligning a spectral object such as a sample.

[0002]

2. Description of the Related Art Generally, in this type of spectroscope, as shown in FIG. 10, incident light 1 from a spectroscopic object such as a measurement sample or a light source condensed through a condensing lens enters a spectroscope main body 2. It passes through the side slit 3 and enters the spectroscope to perform spectroscopic measurement.
This incident light 1 is first reflected by, for example, a plane mirror 4, then the reflected light is reflected by a concave mirror 5, and then a diffraction grating 6
The light 9 dispersed by the concave mirror 7 and the plane mirror 8 passes through the exit slit 10 of the spectroscope body 2 to reach the outside of the spectroscope, and finally the light 9 faces the exit slit 3. For example, as a detector installed in
The target spectral spectrum is obtained by entering the photomultiplier tube.

In performing such a spectroscopic measurement, it is necessary to previously align the position of the sample by using a light source for optical axis alignment.

Conventionally, this alignment has been performed using a laser 11 as a light source for optical axis alignment. That is, as shown in FIG. 15, the entrance-side slit 3 and the exit-side slit 10 are preliminarily positioned in the spectroscope main body 2 so as to be on the optical axis, and the optical-axis alignment laser 11 is set to the exit-side slit 10. The method mainly used is to install the laser beam on the outside of the laser beam, enter the laser beam from this slit 10, and place the spectral object 12 on the optical axis of the laser beam that has passed through the spectroscope body 2 and exited from the incident side slit 3. ing. Reference numeral 13 is a condenser lens.

[0005]

However, the structure of such a spectroscope has the following problems.

In order to secure a space for installing the laser 11 for optical axis alignment, it is necessary to make the optical components and the like placed in the exit side slit 10 regress in the subsequent spectroscopic measurement after the alignment. Sometimes it is troublesome.

The laser light must pass through the centers of the exit side slit 10 and the entrance side slit 3 accurately at the same time, which is troublesome.

Since the laser beam used has a strong directivity and the beam diameter is small, it is difficult to know whether or not it is in focus. That is, when using laser light,
As shown in, it is difficult to visually distinguish the case where the image is formed at the position of the focus F and the case where the image is formed at the positions A and B where the focus is deviated. Therefore, it is difficult to perform alignment in the direction along the optical path (where to place the spectroscopic object). This is because, for example, in the case of spectroscopic measurement, non-visible light (infrared rays, ultraviolet rays) is also used, so these lights are invisible, so focusing including using these lights is important. It has become a challenge.

The present invention provides a spectroscope capable of easily and accurately aligning the optical axes of the spectroscope and an external object.

[0010]

In order to achieve the above-mentioned object, the present invention irradiates light from a light source onto a spectral object,
The reflected light or fluorescence from this spectral object is made incident on the spectroscope body through the entrance side slit from the first window provided on the spectroscope body, and this incident light is installed in the spectroscope body. After being dispersed by a spectroscopic means such as a diffraction grating, the dispersed light passes through the second window from the emission side slit and is emitted from the spectroscope body, and the emitted light is provided at a position facing the emission side slit. In a spectroscope for taking a spectroscopic measurement by taking it into a system, an entrance side slit and / or an exit side slit is composed of an auxiliary light source having a weak directivity and a slit main body. Alternatively, when facing the second window and aligning the optical axes of the incident optical path and / or the outgoing optical path before the spectroscopic measurement, the auxiliary light source is used instead of the slit main body for another focus with respect to the focus. A spectroscope, characterized in that with a first window and / or positioning means capable to face the second window to be located at the focal point of.

The auxiliary light source having weak directivity in the present invention means a light source such as a light emitting diode having a width larger than that of laser light, unlike light having strong directivity such as laser light. For example, since the laser beam 40 shown in FIG. 11 is condensed while the directivity is strong, that is, the laser beam 40 is incident on the condensing lens 13a placed on the optical axis L in a state where it has a constant thickness (width). Therefore, it is difficult to distinguish whether the focused light emitted from the condenser lens 13a is focused on the focal point F or is focused on the positions A and B where the focal point F is slightly deviated in the front and rear directions. On the other hand, as shown in FIG. 12, since the light 41 of the light emitting diode 21 as the auxiliary light source used in the present invention has a weak directivity, the position of the converging focus F and the positions A and B of defocus are clearly distinguished. Easier to do.

As the positioning means in the present invention, for example, as shown in FIG. 3, a plunger 27 and a V groove 29 are provided.
Examples include those composed of a and 29b. Further, in the present invention, as shown in FIGS.
The positioning means includes a simple structure in which slit holding holes 40 for holding the slit holders 22a and 22b are provided in a and 19b.

The spectroscopic object in the present invention includes a measurement sample, a light source and the like.

[0014]

According to the above construction, instead of the slit body provided in the entrance side slit and / or the exit side slit of the spectroscope, the auxiliary light source is provided in the first and / or second window so as to be located at the focal position. Since it is configured to face, there is no need to move the optical components around the spectroscope at the time of optical axis alignment. In addition, since a light source with weak directivity is used as the auxiliary light source for optical axis alignment instead of a laser, the occurrence of defocus can be suppressed more than when a laser is used as the light source, and the focused light from the auxiliary light source can be reliably focused. Focus on the position. As a result, in the subsequent spectroscopic measurements,
By placing a light source for spectroscopic measurement on the focus, spectroscopic measurement without defocus becomes possible. Further, in the present invention, the optical axis can be adjusted by a simple operation of replacing the slit body with the auxiliary light source.

[0015]

Embodiments of the present invention will be described below.
However, the present invention is not limited thereby. 2 to 4, the same reference numerals as those shown in FIGS. 10 and 15 indicate the same or corresponding components.

2 to 4 show a first embodiment of the present invention.

In FIG. 2, the spectroscope is a box-shaped spectroscope main body 2 having an upper opening 2a, and a first window 3 on the incident side provided on the facing surfaces 2b and 2c of the main body.
4. The second window 35 on the emission side, the incident side slit 3, and the emission side slit 10 mainly.

Further, the entrance side slit 3 is shown in FIGS.
As shown in FIG. 1, a slit box 1 having an insertion opening 18
9 and a slit holder 22 having a slit body (hereinafter referred to as a slit) 20 and a light emitting diode (auxiliary light source) 21 on the same surface. This holder is provided with a light hole 23 through which reflected light or fluorescence from a spectroscopic object (hereinafter referred to as sample) can pass during spectroscopic measurement.
The slit 23 is fixed to a in a replaceable state.
Further, the holder 22 is provided with an L-shaped light emitting diode hole 21a below the light hole 23, and the light emitting diode 21 has a power source 24 and a cable 25, and the step portion 2 of the hole 21a is provided.
1b, the light emitting diode 2 inserted into the hole 21a
1 is locked. Then, as shown in FIG. 4, the light emitting diode 21 is locked on the same surface as the slit 20 by the respective step portions 23a and 21b. That is, when the light emitting diode 21 faces the window 34, the center position of the slit 20, that is, the slit 20 is positioned at the window 3.
The light emitting diode 21 is installed at the same position as the center position of the slit 20 when facing the slit 4. By doing this, when aligning the optical axes of the incident optical paths,
The light emitting diode 21 comes to the image forming position formed by the condenser lens.

A screw hole 26 is provided on one side surface of the slit box 19, and a plunger 27 is inserted into the screw hole 26 and fixed by a nut 28. A pin 27a at the tip of the plunger 27 is biased by a spring 27b (see FIG. 5). On the other hand, on one side surface of the slit holder 22, the slit box 19
With the pin 27a of the plunger 27 when the holder 22 is inserted into the insertion opening 18, the holder 22 is fixed so that the slit 20 faces the window 34, or the holder 22 fixes the light emitting diode 21 so as to face the window 34. V groove 2 for
9a and 29b are provided, respectively. The plunger 27 and the V grooves 29a and 29b constitute positioning means.

In this embodiment, the exit side slit 10 is used.
However, if the mechanism of this embodiment is attached to the exit side slit, the optical axis of the exit optical path can be easily and surely adjusted. Therefore, it is preferable to provide the mechanism of the present invention in either or both of the entrance slit and the exit slit depending on the purpose.

Further, in FIGS. 2 to 4, reference numeral 30 is an upper lid of the spectroscope body 2, which has an entrance slit 3.
Hole 30 for inserting a slit holder communicating with the insertion port 18 of
a is provided. The same hole 30b is also provided on the exit side slit 10 side. Reference numeral 31 is a leg portion of the spectrometer body 2, and reference numeral 32 is a knob of the slit holder 22.

A method of aligning the optical axis of the incident optical path before the spectroscopic measurement will be described below with reference to FIGS. 1 and 2 to 4.

Instead of the slit 20, the light emitting diode 2
1 to face the first window 34, the slit holder 2
When 2 is mentioned above, the light emitting diode 21 is installed at the same position as the central position of the slit 20 instead of the slit 20. Thereby, the light emitting diode 21 can be correctly installed on the optical axis of the spectroscope. Therefore, as described above, with the plunger 27 for the positioning stopper and the V groove 29b,
I have decided the position. At this time, the condenser lens 13 is also adjusted appropriately. As a result, as shown in FIG. 1, the light from the light emitting diode 21 is focused by the condenser lens 13 placed outside the spectroscope. Place the sample 12 at this focus position, and
By making the laser 14 incident on the focus position, the optical axis alignment of the incident optical path is completed.

Next, in order to perform spectroscopic measurement, the holder 22 is lowered from the state of FIG. 3 and the slit 20 is installed on the optical axis of the spectroscope. That is, as shown in FIG.
A window (first window) 34 provided on the spectroscope main body 2 by irradiating the phosphor 12 as a sample with the light from the sample 4 and reflected light (fluorescence) from the phosphor 12 through the condenser lens 13. From the incident side, passes through the incident side slit 3 and is incident on the spectroscope main body 2, and the incident light is dispersed by a spectroscopic means such as a diffraction grating installed in the spectroscope main body 2 (see FIG. 10), and then the dispersed light is emitted. As a spectroscopic measurement system, the side slit 10 passes through a window (second window) 35 and is emitted from the spectroscope body 2, and the emitted light is provided at a position facing the emission side slit 10 via the condenser lens 15. It is taken into the photoelectron amplification tube 16 and the spectroscopic measurement is performed. In this embodiment, a laser beam having a wavelength of 500 nm is used as the light source 14, and the light emitted from the phosphor 12 has a wavelength of 6
20 nm fluorescence was used. The red light emitting diode was used.

As described above, in the present embodiment, since the laser light having directivity is not used as the auxiliary light source, and the light-emitting diode having weak finger light is used as the auxiliary light source, the case where the laser light is used is shown in FIG. As shown in the figure, it is difficult to visually distinguish the case where the image is formed at the position of the focus F and the case where the image is formed at the positions A and B where the focus is deviated, but as in the present embodiment shown in FIG. In addition, if you use a light-emitting diode, focus F and A
A point or the points F and B can be distinguished relatively easily and an image can be reliably formed on the focus F. As a result, at the time of spectroscopic measurement, as shown in FIG. 13, the focal point F is formed in front of the entrance side slit 3, or as shown in FIG. Does not match the optical system.

6 to 9 show that after the entrance side slit 3a or the exit side slit 10a is removed from the spectroscope,
A second embodiment of the present invention will be described in which a light emitting diode 21 as an auxiliary light source can be installed from the outside.

6 to 9, the same reference numerals as those shown in FIGS. 2 to 4 designate the same or corresponding components.

In this experimental example, a slit holder 22b (see FIG. 9) having only the slit 20 as a slit holder and a diode holder 22a (see FIG. 7) having only the light emitting diode 21 are divided. Therefore, when it is desired to adjust both the incident optical path and the outgoing optical path, the light emitting diode 21,
Although two sets of light emitting diodes 21 are required, this embodiment has an advantage that one light emitting diode 21 can be used by disposing one light emitting diode 21 on the incident side and the emitting side alternately.

From another point of view, the present invention irradiates light from a light source onto a spectroscopic object, and reflects light or fluorescence from this spectroscopic object from a first window provided in the spectroscope body. After passing through the side slit and entering the spectroscope body, the incident light is dispersed by a spectroscopic means such as a folding grating installed in the spectroscope body, and then this dispersed light is emitted from the exit side slit to a second window. When passing the light through the spectroscope body and taking the emitted light into a spectroscopic measurement system installed at a position facing the exit side slit to perform spectroscopic measurement, the incident side slit and The auxiliary light source provided in the exit slit faces the first and / or the second window, and light from the auxiliary light source is incident to form an incident and / or exit optical path. Set things up It can provide an optical axis alignment method of the incident and / or emitted light path of the spectrometer consisting of a.

[0030]

As described above, according to the present invention, the entrance side and / or the exit side slit of the spectroscope is temporarily retreated, and the auxiliary light source is provided at the center of the original position of the entrance side and / or the exit side slit. Place the light from the auxiliary light source so that it is focused by a lens placed outside the spectroscope, etc., and place the spectroscopic object where you want to collect the dispersed light at this focus position. Since the optical axes can be aligned by means of this, there is no need to move the optical parts around the spectroscope when aligning the optical axes.

It can be handled by a very simple operation of replacing the slit with a minute light source.

Since a minute light source having a weak directivity is used, light from the minute light source is surely focused at the focal position by a lens or the like placed outside. Therefore, not only the direction perpendicular to the optical axis but also the direction along the optical axis can be accurately aligned.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of the overall configuration of the present invention.

FIG. 2 is an exploded perspective view showing the first embodiment of the present invention.

FIG. 3 is an explanatory diagram of a main part configuration in the embodiment.

FIG. 4 is an explanatory diagram of a main part configuration viewed from a direction of a line III-III in FIG. 3.

FIG. 5 is an explanatory diagram of a main part configuration in the first embodiment.

FIG. 6 is a perspective view showing a second embodiment of the present invention.

FIG. 7 is a perspective view of a main part in the second embodiment.

8 is a perspective view including a part of an explanatory view of a main part configuration viewed from a direction of line VV in FIG. 7. FIG.

FIG. 9 is an explanatory diagram of a main part configuration in the second embodiment.

FIG. 10 is an explanatory diagram of an overall configuration showing spectroscopic measurement.

FIG. 11 is a structural explanatory view showing a condensing operation when a light emitting diode is used.

FIG. 12 is a configuration explanatory view showing a condensing operation when a laser beam is used.

FIG. 13 is a structural explanatory view showing an example of an optical system whose optical axes are not aligned.

FIG. 14 is a structural explanatory view showing another example of an optical system whose optical axes are not aligned.

FIG. 15 is an explanatory diagram of an overall configuration showing a conventional example.

[Explanation of symbols]

1 ... Incident light, 2 ... Spectrometer body, 3, 3a ... Incident side slit, 10, 10a ... Emitting side slit, 12 ... Phosphor (spectral object), 14 ... Laser (light source), 16 ... Photomultiplier tube ( Spectroscopic measurement system), 20 ... Slit body, 21 ... Light emitting diode (auxiliary light source), 27 ... Plunger, 29a,
29b ... V groove, 34, 35 ... Window, 40 ... Positioning hole.

Claims (1)

[Claims] 1. A spectroscope which irradiates light from a light source onto a spectroscopic object and allows reflected light or fluorescence from this spectroscopic object to pass through an entrance-side slit through a first window provided in the spectroscopic body. After entering the main body and dispersing this incident light by a spectroscopic means such as a diffraction grating installed in the main body of the spectroscope, the dispersed light is emitted from the main body of the spectroscope after passing through the second window from the slit on the exit side. In the spectroscope for taking the emitted light into a spectroscopic measurement system provided at a position facing the outgoing side slit and performing the spectroscopic measurement, the incident side slit and / or the outgoing side slit are formed from an auxiliary light source having weak directivity and a slit body. Further, during the spectroscopic measurement, the slit main body faces the first window and / or the second window, and when the optical axes of the incident optical path and / or the outgoing optical path before the spectroscopic measurement are aligned, Instead of the above A spectroscope comprising a positioning means capable of exposing the auxiliary light source to the first window and / or the second window so that the auxiliary light source is located at another focal point relative to the focal point where the spectral object is located.