JP2001124626A - Spectroscopic analyzer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To actualize a spectroscopic analyzer having high measurement accuracy and enabling the assembling time to be shortened. SOLUTION: This spectroscopic analyzer is used to apply the light outgoing from a case to a sample to measure the spectrum of transmitted or reflected light, or to find characteristic values of the sample based on the spectrum. Optical members and heat generating members are disposed in separate chambers or in separate cases, while the diameter of a light transmitting hole and the wavelengths transmitted by a filter are optimized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to petrochemical, chemical,
The present invention relates to a spectrophotometer for analyzing components of a measurement sample using a wavelength in a near-infrared region in a field such as food.

[0002]

2. Description of the Related Art FIG. 3 is a plan view showing a conventional structure of a spectrometer. In the drawing, reference numeral 1 denotes a case in which an optical member is arranged. In this case 1, a lamp 2 for emitting measurement light, a laser beam generator 3, a collimator lens 4, a beam splitter 5, a fixed mirror are provided as shown in the figure. 6,
A movable mirror 7, a movable mirror holder 8, a condenser lens 9, and a laser beam detector 14 are housed therein.

The outer wall of the case 1 has a fiber adapter 1
0 is fixed, and the measurement sample 1 is
2. The light detection unit 13 is provided. In the above-described configuration, the measurement light having a broad wavelength range emitted from the lamp 2 is converted into parallel light by the collimator lens 4 and split via the beam splitter 5 in two directions in which the fixed mirror 6 and the movable mirror 7 are arranged. You.

When the movable mirror 7 is scanned in the direction of the optical axis, an optical path difference is generated between the light reflected from the fixed mirror 6 and the light recombined by the beam splitter 5 in a broad wavelength band. The combined interference light is obtained.

The interference light is condensed by a condenser lens 9 and guided to an optical fiber 11 via a fiber adapter 10. The light is transmitted through or reflected by the sample 12 as sample light, and is received by the light detection unit 13, whereby an absorption spectrum or a reflection spectrum of the sample to be measured can be obtained.

Here, the sampling of data is performed in synchronization with the interference signal of the laser beam emitted from the laser beam generator 3. At this time, the absolute wavelength of the wavelength measured by the sample light is the position of the laser beam and the position of the lamp 2. It depends on the relationship and the positions of the condenser lens 9 and the optical fiber 10.

Here, the lamp 2, laser beam generator 3, collimator lens 4, beam splitter 5, fixed mirror 6, movable mirror holder 8, condenser lens 9, and fiber adapter 10, which are the respective components, are provided in the case 1. Is held on a predetermined optical reference plane.

[0008]

In the above-mentioned prior art, the lamp, the laser beam generating means, and the optical system member, which are the heating members, are arranged in the same room. The temperature rise inside the spectrometer body may be increased by being placed inside the spectroscope. Further, to increase the measurement accuracy, it is necessary to increase the light intensity of the lamp. However, if the light intensity of the lamp is increased, the temperature rise increases, and the problem due to the influence of heat increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a lamp and a laser beam generator, which are heating elements, are disposed in a chamber separate from an optical system member, and a measurement error due to heat of the optical system member is provided. It is an object of the present invention to realize a high-accuracy spectrophotometer with reduced noise.

[0010]

In order to achieve the above object, according to the present invention, in claim 1, the sample is irradiated with light emitted from the case, and the spectrum of the transmitted or reflected light is measured. Alternatively, in the spectrometer for obtaining the property value of the sample based on the spectrum, the optical system member and the heat generating member housed in the case are arranged in separate rooms.

According to a second aspect of the present invention, in the spectrometer according to the first aspect, the case is divided by a partition wall having a through hole for light emitted from the heat generating member.

According to a third aspect of the present invention, in the spectrometer according to the second aspect, a through hole through which the measurement light and the laser beam pass is formed in the partition wall, and the diameter of the through hole is a minimum required for the measurement. It is characterized by having an opening in size.
According to a fourth aspect, in the spectrometer according to any one of the first to third aspects, the case is partitioned by two or more walls, and a heat insulating layer is provided between the walls.

According to a fifth aspect of the present invention, in the spectrometer according to the fourth aspect, the heat insulating layer is configured to flow a gas or a liquid between the walls. According to a sixth aspect of the present invention, in the spectrometer according to any one of the first to fifth aspects, a cooling member or a cooling mechanism for cooling a partition wall of a chamber in which the heat generating member is stored is provided.

According to a seventh aspect of the present invention, in the spectrometer according to any one of the second to sixth aspects, a filter for transmitting only a wavelength band required by the optical system is provided in the light passage hole of the partition wall. Features.

According to the eighth aspect, in the spectrometer according to any one of the first to seventh aspects, the optical system member and the heat generating member can be housed in separate cases, and these cases can be positioned. It is characterized by being fixed by a connecting member.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing an example of an embodiment of the present invention. Note that the same components as those shown in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 1, reference numeral 1a denotes a first case, and 1b denotes a second case. These are formed to a depth that can accommodate the components. have.

In this embodiment, the case 1 is airtightly partitioned by partition walls 15a and 15b extending from the bottom to the upper edge. A heat insulating (air) layer 16 is formed between the partition walls 15a and 15b, and a cooling member 17 made of, for example, a Peltier element is attached to a side of the partition wall where the heat generating member is arranged. Although not shown in the drawing, it is also possible to adopt a configuration in which air or liquid flows in the heat insulating layer 16.

The chamber in which the heat generating member is disposed and the chamber in which the optical system is disposed are partitioned by partition walls 15a and 15b.
By cooling the partition wall with the cooling member 17, it is possible to suppress a rise in the temperature of the room in which the optical system is disposed.

Reference numerals 22a and 22b denote holes for transmitting the light from the lamp 2 converted into parallel light by the collimating lens 4 and the laser light generated by the laser beam generator to the optical system side. These holes have an optimally sized diameter through which parallel light required for measurement can be transmitted.

Reference numeral 20 denotes a filter provided so as to cover the holes 22a and 22b, and transmits only a wavelength band necessary for the optical system. By optimizing the diameter of the light transmission hole and the wavelength transmitted through the filter in this manner, highly accurate measurement can be performed.

FIG. 2 shows an example of the embodiment according to the eighth aspect. In this example, the cases 1a and 1b are manufactured separately, and these cases are interposed at a predetermined interval (heat insulating layer). Bracket 3 that can position each case
0 is connected. According to such a configuration, the case 1a in which the optical system is arranged and the case 1 in which the heat generating member is arranged
By separately assembling b and then performing fine adjustment, the assembling time can be reduced.

The foregoing description of the present invention has been presented by way of illustration and example only of a particular preferred embodiment. Accordingly, the present invention has many modifications, without departing from its essence,
It will be apparent to those skilled in the art that variations can be made.

For example, the partition wall may be single-walled, and the cooling member may be attached at a location between the heat insulating layers 16 shown in FIG. 1, for example. Although the heat insulating layer has been described as air, a plastic member having a high heat insulating effect may be packed. In addition, the arrangement of each component is not limited to the embodiment, but the arrangement may be any as long as the influence of heat generation does not affect the optical system side.

[0024]

As described above, according to the present invention,
The spectrum of transmitted or reflected light is measured by irradiating the sample with the measurement light emitted from the case, or the spectrometer that determines the property value of the sample based on the spectrum is used. (Claim 1), these are partitioned by a partition wall (Claim 2) The number of light passage holes is minimized (Claim 3), and a heat insulating structure is provided between the partition wall and the partition wall (Claims 4, 5, and 6). ), The influence of heat on the optical system members can be reduced.

Further, by optimizing the diameter of the transmission hole of the measurement light and the wavelength transmitted through the filter (claim 7), a spectrometer with high measurement accuracy can be realized. Are housed in separate cases, and these cases are fixed by connecting members capable of positioning (claim 8), so that the assembling time can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating an example of an embodiment of a spectrometer according to the present invention.

FIG. 2 is a plan view showing an example of another embodiment.

FIG. 3 is a plan view showing a conventional example.

[Explanation of symbols]

 1a, 1b Case 2 Lamp 3 Laser Beam Generator 4 Collimator Lens 5 Beam Splitter 6 Fixed Mirror 7 Moving Mirror 8 Moving Mirror Holder 9 Condensing Lens 10 Fiber Adapter 11 Optical Fiber 12 Sample 13 Light Detector 14 Laser Beam Detector 15a, 15b Partition wall 16 Heat insulation layer 17 Cooling member 20 Filter 30 Connection bracket

Claims (8)

[Claims] 1. A spectrophotometer for irradiating a sample with light emitted from a case and measuring the spectrum of the transmitted or reflected light, or for obtaining a property value of the sample based on the spectrum, and stored in the case. A spectrometer characterized in that the optical member and the heat generating member are arranged in separate rooms. 2. The spectrometer according to claim 1, wherein the case is divided by a partition wall having a through hole for light emitted from the heat generating member. 3. The partition wall is formed with a through hole through which the measurement light and the laser beam pass, and the diameter of the through hole is reduced to a minimum size necessary for the measurement. Spectrometer. 4. The case according to claim 1, wherein the case is divided by two or more walls, and a heat insulating layer is provided between the walls.
3. The spectrophotometer according to any one of 3. 5. The spectrometer according to claim 4, wherein the heat insulating layer has a structure in which gas or liquid flows between the walls. 6. The spectrometer according to claim 1, further comprising a cooling member or a cooling mechanism for cooling a partition wall of the chamber in which the heat generating member is stored. 7. The spectrometer according to claim 2, wherein a filter that transmits only a wavelength band required by the optical system is provided in a light passage hole of the partition wall. 8. The optical system according to claim 1, wherein the optical system member and the heat generating member are housed in separate cases, and the respective cases are fixed by a connecting member capable of performing positioning. Spectrometer.