JPS5924977Y2 - spectrophotometer - Google Patents

Description

[Detailed explanation of the invention] This invention is a spectrophotometer, especially one for long wavelengths and one for short wavelengths.
This invention relates to a spectrophotometer that uses a variety of light sources and has a wide measurement range.

As light sources for spectrophotometers having a wide measurement range, tungsten lamps have been used for long wavelengths (1000 to 35 Qnm), and heavy water lamps have been used for short wavelengths (350 to 200 nm).

On the other hand, phototubes used as detectors for detecting long wavelengths do not have sufficient output sensitivity for wavelengths below 600 nm, so for wavelengths below 600 nm, short-wavelength phototubes such as pie-alkali types are replaced with tungsten lamps. They are used in combination.

However, even in this case, measurements below 359 nm are impossible due to the wavelength characteristics of the tungsten lamp, so a combination of a pie-alkali phototube and a deuterium lamp is used for the even shorter range of 350 to 200 volumes.

Figure 1 is a photocurrent output characteristic diagram, where a is a tungsten lamp and a phototube for long wavelengths, b is a tungsten lamp and a pie-alkali phototube for short wavelengths, and C is a deuterium lamp and a pie-alkali phototube for short wavelengths. This is a photocurrent output curve when combining the following.

When measuring a wide range of wavelengths from long wavelengths to short wavelengths, the conventional method described above requires switching the detector at around 600 nm and then switching the light source at around 350 nm, making the operation complicated and monochrome. meter wavelength sending,
If the above-mentioned switching is to be performed in conjunction with each other, a double switching interlocking mechanism is required, resulting in the inconvenience of complicating the mechanism.

This device is equipped with two types of detectors with sensitivity characteristics matching the wavelength range of the light source, in order to simplify the switching operation between the light source and the detector that accompanies the wavelength feeding operation of the monochromator. It is an object of the present invention to provide a spectrophotometer in which a corresponding light source and a detector can be simultaneously switched as one unit by an interlocking switching mechanism that mechanically connects the switching mechanism of the instrument.

One embodiment of this invention will be described below.

FIG. 2 is an explanatory diagram of the configuration of a spectrophotometer according to one embodiment of this invention, where 1 is a monochromator, 2 is a tungsten lamp, and 3 is a monochromator.
is a light source such as a deuterium lamp, and these light sources are switched by a light source switching mirror (light source switching mechanism) 4.

A light source switching mirror 4 serving as a light source switching mechanism is attached to a switching operation lever 6 via a holding shaft 5, and directs the output light of the tungsten lamp 2 or deuterium lamp 3 to the entrance window (not shown) of the monochromator 1. The light source is switched by selectively reflecting the light toward the other direction.

7 is the light source luminous flux, 8 is the spectral luminous flux from the monochromator 1,
It passes through the sample cell 9 and enters the photodetector of the phototube 10 or the photovoltaic cell 11 in an alternatively switched manner.

12 is a detector switching mirror (detector switching mechanism), and fulcrum 1
It is attached to a holding arm 14 that is tiltably supported on the holder 3 and moves back and forth with respect to the measurement light beam 15, and reflects the measurement light beam 15 toward the photocell 11 or directly inputs it into the photocell.
Selectively switch charge detector.

The operation of each switching mechanism such as the light source switching mirror 4 and the detector switching mirror 12 is performed by a link mechanism as an interlocking mechanism, and each switching mechanism is connected to a first lever 16 coupled to an extension of the operating lever 6 and a holding lever The arm 14 is integrally connected to the arm 14 via a second lever 17 .

18 is a fulcrum of the second lever 17.

That is, when the direction of the light source switching mirror 4 is changed using the operating lever 6 and the light source is switched to the tungsten lamp 2 side, the detector is switched to the photovoltaic cell 11 side by the detector switching mirror 12, and conversely, the deuterium When the light source is switched to the lamp 3 side, the detector is correspondingly switched to the phototube 10 side.

The phototube 10 and the charging cell 11 are selected to have sensitivity characteristics matching the wavelength ranges of the deuterium lamp 3 and tungsten lamp 2, respectively, as shown by the curves in FIG. 1d.

When the tungsten lamp 2 and the photovoltaic cell 11 are combined in this way, sufficient photocurrent can be changed up to 350 nm.
For wavelengths between 200 nm and 200 nm, a combination of a deuterium lamp 3 and a short wavelength detector such as a pie arcano phototube 10 is used.
It is possible to switch the light source and detector simultaneously at 35Q nm.

In other words, this device selects a tungsten lamp, a photocell with sensitivity characteristics that match the wavelengths of two (plural) light sources such as a deuterium lamp, and a detector such as a phototube, and then A spectrophotometer that is designed to be switched in conjunction with a light source, and that can perform measurements over a wide wavelength range with simple operations by simply switching once, that is, by having one switching signal generating means (switching switch). It is possible to realize this.

Furthermore, FIG. 3 shows a plan view for explaining the configuration of a spectrophotometer according to another embodiment of this invention.

In the figure, parts common to those in FIG. Each phototube 10 is attached to one light source stand 18 and one detector stand, and these stands 18 and 19 are moved left and right by an interlocking movement frame (interlocking mechanism) 20.

21 is a condensing lens for a light source, and 22 is a reflecting mirror for a detector.

That is, this embodiment also provides the same effects as the first embodiment.

Furthermore, in any of the above embodiments, it is expected that the interlocking switching means for the light source and the detector and the wavelength operation of the monochromator will be interlocked to further simplify the measurement operation.

[Brief explanation of the drawing]

Fig. 1 is a diagram illustrating the sensitivity characteristics of the detector, Fig. 2 is a perspective view illustrating the configuration of a spectrophotometer according to one embodiment of this invention, and Fig. 3 is a configuration of a spectrophotometer according to another embodiment of this invention. It is a top view for explanation. 1: Monochromator, 2: Tungsten lamp (light source)
, 3: Deuterium lamp (light source), 4: Light source switching mirror (light source switching mechanism), 6: Operation lever, 10: Phototube, 11:
Photocell, 12: Detector switching mirror (detector switching mechanism),
16: 1st lever (interlocking mechanism), 17: 2nd lever (interlocking mechanism), 20: interlocking movement frame (interlocking mechanism).

Claims (1)

[Scope of utility model registration request] A spectrophotometer that uses two types of light sources with different wavelength ranges by switching, is equipped with two types of detectors with sensitivity characteristics that match the wavelength range of the light source, and the switching mechanism for the light source and detector is mechanically connected. A spectrophotometer characterized in that a corresponding light source and detector are simultaneously switched as one unit by an interlocking switching mechanism.