JP2000039361A - Multi-wavelength polarimeter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-wavelength polarimeter which can reduce errors in recognizing a measurement wavelength, setting of a hardware fit for the wavelength, or the like when a filter for setting the wavelength is exchanged. SOLUTION: The multi-wavelength polarimeter allowing an exchange of wavelength-setting filters of different wavelengths includes filter sensors 150, 152, D1-D4 which can output a predetermined identification signal for each wavelength of the filter 116 and a recognizing means 158 for recognizing the wavelength of the filter 116 on the basis of the recognition signals from the filter sensors 150, 152, D1-D4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a multi-wavelength polarimeter, and more particularly to a mechanism for recognizing the type of a wavelength setting filter.

[0002]

2. Description of the Related Art Various organic substances have the property of rotating the plane of polarization of linearly polarized light. By measuring such an optical rotation, identification of a substance or identification of an optical isomer can be performed. FIG. 1 shows a polarimeter for measuring such optical rotation. In FIG. 1, a slit 12 is provided in front of the light source 10 in the light emission direction, and a light beam that has been converted into a predetermined linearly polarized light by the slit 12 passes through a lens 14 provided in front of the slit 12.

The light beam that has passed through the lens 14 becomes a parallel light beam and passes through a wavelength setting filter 16 provided in front of the lens 14. The light beam that has passed through the wavelength setting filter 16 becomes a light beam having a predetermined wavelength, and passes through a polarizer 18 provided in front of the filter 16. The light beam that has passed through the polarizer 18 becomes linearly polarized light in a predetermined vibration direction,
8 passes through a Faraday cell 20 provided in front of it.

[0004] The Faraday cell 20 is formed of a coil wound in multiple layers. The coil is provided with an oscillating circuit 22 for passing an alternating current. The plane of polarization of the linearly polarized light is modulated by the Faraday cell 20. The luminous flux passing through the Faraday cell 20 enters the cell 24 filled with the sample, passes through the filled sample, and
It passes through the analyzer 26.

The analyzer 26 is installed with its angle adjusted so that the polarization direction of the polarizer 18 and the transmission axis direction of the analyzer 26 are orthogonal to each other. That is, based on the polarization direction information of the polarizer 18 from the oscillation circuit 22 via the main amplifier 28 and the like, the drive circuit such as the servo amplifier 30
Drive the adjusting means such as 2; The driving force of the servo motor 32 is transmitted to the analyzer 26 via the gear 34 so that the polarization direction of the polarizer 18 and the transmission axis direction of the analyzer 26 are orthogonal to each other.

More specifically, the output signal from the preamplifier 38 is synchronized with the reference signal from the oscillation circuit 22 by the main amplifier 28 to detect a signal component and a phase having the same frequency as the oscillation circuit 22. The signal is amplified under the optimum condition, and the servo amplifier 30 drives the servo motor 32 with this signal and the phase to rotate the analyzer 26 incorporated in the gear 34 until the signal of the same frequency as the oscillation circuit 22 disappears.
That is, by keeping the polarizer 18 and the analyzer 26 in a cross-tonic state at all times, the rotation angle of the sample can be measured.

The light that has passed through the analyzer 26 is transmitted to a detector 36.
Is incident on. The detector 36 is composed of, for example, a photomultiplier tube. In order to properly control the output voltage of the detector 36 such as a photomultiplier tube, electric signals of a preamplifier 38, a reference amplifier 40, and a high-voltage power supply 42 for the photomultiplier tube are fed back to the detector 36.

More specifically, a 2 fHz component (a signal component having a frequency twice the modulation frequency) of the output signal of the preamplifier 38 is amplified by a reference amplifier 40 and input to a high-voltage power supply 42 for a photomultiplier tube. Thus, the 2fHz signal component (the signal component having a frequency twice as high as the modulation frequency) is controlled to have a predetermined value. Here, the photomultiplier tube has different sensitivity depending on the applied voltage.
By incorporating 2 into a signal feedback circuit, that is, a detector 36, a preamplifier 38, a reference amplifier 40, and the like, it becomes possible to keep a signal component having a frequency twice as high as a modulation frequency at a predetermined value.

On the basis of the electric signal obtained by the detector 26,
The optical rotation is determined by a central processing unit (hereinafter, referred to as a CPU 46) via the preamplifier 38, the interface 44, and the like. With the polarimeter configured as described above, the optical rotation can be measured. By the way, in order to measure such optical rotation with high sensitivity, the measurement wavelength must be set according to the sample.

As a means for setting such a measurement wavelength, the wavelength setting filter is used. However, in a single-wavelength polarimeter in which such a wavelength setting filter is fixedly arranged in a predetermined optical path of the polarimeter, the problem is that the sensitivity is inferior because the amount of information is small.

Therefore, in order to obtain high-level information, it is conceivable to use an optical rotation dispersometer having an enlarged measurement wavelength, but since it is very expensive, it has not been generally adopted. Therefore, in order to expand the measurement wavelength at low cost, a multi-wavelength polarimeter capable of replacing a wavelength setting filter having a different wavelength has been attracting attention.

When such a multi-wavelength polarimeter is used, even a sample which is difficult to measure with a single-wavelength polarimeter, it is possible to perform measurement by changing the measurement wavelength. It is possible to obtain knowledge on samples that do not exist. In addition, it is possible to provide information on effective drugs, and it is also possible to provide information on evaluation of drug efficacy.

[0013]

However, even in the conventional multi-wavelength polarimeter, when replacing the wavelength setting filter, the user must recognize the type of the filter, that is, the wavelength. In addition, since hardware settings and the like suitable for the wavelength must be made, there are the following problems.

That is, in the conventional multiwavelength polarimeter, the type of the wavelength setting filter used by the user, that is, the measurement wavelength must be recognized. However,
If the user misrecognizes the measurement wavelength, the measurement data is processed at the wrong wavelength, so that the reliability of the analysis result cannot be sufficiently ensured. In a multi-wavelength polarimeter, when the wavelength setting filter is replaced and the measurement wavelength is changed, the type of the wavelength setting filter used, that is, a hardware suitable for the wavelength, is used in order to perform the measurement properly. Hardware settings.

For example, by always keeping the polarizer 18 and the analyzer 26 in a cross-tonicol state as described above,
The optical rotation angle of the sample can be measured, but in order for such a feedback mechanism to function under optimal conditions, an optimal gain setting is always required. That is, if the gain is too high, a hunting state occurs, and if the gain is too low,
The dead zone becomes large, and high-precision measurement becomes impossible.
Since the optical conditions are different when the measurement wavelength is changed, it is required to recognize the wavelength and optimize this gain.

However, in the conventional multiwavelength polarimeter,
If the user misrecognizes the measurement wavelength, the hardware will be set at the wrong wavelength, making it very difficult to perform the measurement properly. The present invention has been made in view of the above-described problems of the related art, and an object of the present invention is to provide a multi-wavelength polarimeter capable of recognizing a measurement wavelength and reducing errors such as hardware setting suitable for the wavelength. is there.

[0017]

In order to achieve the above object, a multiwavelength polarimeter according to the present invention comprises a filter sensor,
And recognition means. Here, the filter sensor can output a predetermined identification signal for each wavelength of the wavelength setting filter. The recognition means recognizes a wavelength of a wavelength setting filter arranged in a predetermined optical path of the multi-wavelength polarimeter based on an identification signal from the filter sensor.

In the multi-wavelength polarimeter, a holder capable of holding the wavelength setting filter in a predetermined optical path is provided, and the filter sensor includes a recognition hole, a light emitting element, and a light receiving element. Is preferred. here,
The recognition hole, for each wavelength of the wavelength setting filter,
It is provided at a predetermined portion of the holder. Further, the light emitting element is capable of allowing recognition light to enter the recognition hole. The light receiving element is provided on the opposite side of the light emitting element with the recognition hole interposed therebetween, and can receive recognition light from the light emitting element through the recognition hole, and outputs the presence or absence of the light reception to the recognition means. It is possible.

In the multi-wavelength polarimeter, it is preferable that the wavelength setting filter includes a holder capable of holding the filter in a predetermined optical path, and the filter sensor includes an unevenness and an unevenness sensor. . Here, the irregularities are:
A predetermined portion of the holder is provided for each wavelength of the wavelength setting filter. In addition, the unevenness sensor,
The unevenness can be detected and output to the determination means.

In the multi-wavelength polarimeter, it is preferable that the wavelength setting filter includes a holder capable of holding the filter in a predetermined optical path, and the filter sensor includes a magnet and a magnetic sensor. . Here, the magnet is
A predetermined portion of the holder is provided for each wavelength of the wavelength setting filter. The magnetic sensor can detect the presence or absence of magnetism from the magnet and output the magnetic sensor to the recognition unit.

In the multi-wavelength polarimeter, two or more light sources of different types are simultaneously mounted as the light source, and a light source optimal for the measurement wavelength obtained by the recognition means is selected from the two or more light sources. It is also preferable to provide switching means for enabling the use. It is also preferable that the multi-wavelength polarimeter includes an output unit that can output the measured wavelength information obtained by the recognition unit to the outside. To output the measurement wavelength information obtained by the recognition means here to the outside,
Specifically, this means displaying the measurement wavelength obtained by the recognition means on a display means such as a display, and printing as a part of the measurement data by a printing means such as a printer.

Further, in the multi-wavelength polarimeter, when the wavelength setting filter is replaced, current optimization for optimizing the current of the Faraday cell so that the modulation angle of the Faraday cell does not change before and after the replacement. It is also suitable to provide means. The multi-wavelength polarimeter further includes a current determination program storage unit that stores a program for determining an optimum current of the Faraday cell for each measurement wavelength, wherein the current optimization unit stores the current determination program. It is also preferable to determine an optimal current of the Faraday cell for the measurement wavelength obtained by the recognition means according to a program stored in the means.

In the multi-wavelength polarimeter, it is preferable that the multi-wavelength polarimeter includes an adjusting unit, a driving circuit, and a gain optimizing unit. Here, the adjusting means is capable of adjusting the angle so that the polarization direction of the polarizer is orthogonal to the transmission axis direction of the analyzer. Further, the drive circuit is for driving the adjusting means.

The gain optimizing means optimizes the gain of the driving circuit based on the measured wavelength obtained by the recognizing means. The multi-wavelength polarimeter further includes a gain determination program storage unit that stores a program for determining an optimum gain of the drive circuit for each measurement wavelength, wherein the gain optimization unit includes the gain determination program storage unit. It is also preferable to determine the optimum gain of the drive circuit for the measurement wavelength obtained by the recognition means according to a program stored in the storage section.

[0025]

Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a schematic configuration of a characteristic holder in the multi-wavelength polarimeter according to one embodiment of the present invention. The portions corresponding to those in FIG. 1 are denoted by reference numeral 100, and description thereof is omitted.

First, a characteristic of the present invention is that, when a wavelength setting filter is replaced to change a measurement wavelength, the type of the filter, that is, the measurement wavelength can be automatically recognized. To this end, the present embodiment includes a holder 148, a filter sensor, and a recognition unit.

In the figure, the holder 148 is a holder capable of holding the wavelength setting filter 116. The holder 148 is provided with a measurement hole 148a for exposing a part of the wavelength setting filter 116 outside the holder. The filter sensor includes a wavelength setting filter 1.
A predetermined identification signal can be output for each of the 16 wavelength types.

FIG. 3 shows a schematic configuration when the holder shown in FIG. 2 is arranged in a predetermined optical path. In the figure, the filter sensor includes recognition holes D1 to D4, a light emitting element 150, and a light receiving element 152. The recognition hole D1
D4 is open, for example, so that the recognition holes D1, D2, and D3 can pass light, and closed so that the recognition hole D4 can block light.

The light emitting element 150 is provided with such a holder 14.
When 8 is arranged in a predetermined optical path, recognition light is emitted to the recognition holes D1 to D4. The light receiving element 152 can receive recognition light from the light emitting element 150 through an open recognition hole, for example, the recognition holes D1 to D3, and outputs the presence or absence of the light reception to recognition means described later.

The recognition means includes, for example, a CPU 146 and an R
Serial interface 154 based on S-232C
A central processing unit (hereinafter referred to as a CPU 158) built in the external controller 156 connected through the
RAM1 storing correspondence information between measurement wavelengths and recognition holes
The CPU 158 recognizes the type of the filter, that is, the measured wavelength, from the correspondence information between the measured wavelength of the RAM 160 and the recognition hole based on the identification signal from the filter sensor. Table 1 shows an example of correspondence information between the measurement wavelengths and the recognition holes stored in the RAM 160.

[0031]

[Table 1] ―――――――――――――――――――――――――――――――――― Wavelength (nm) Recognition hole Light source ――― ――――――――――――――――――――――――――――――――― 880 ● ● ● ○ Halogen lamp ―――――――――― ―――――――――――――――――――――――――― 633 ● ● ○ ● Halogen lamp ――――――――――――――――― ――――――――――――――――――― 589 ○ ○ ○ ○ Sodium lamp ―――――――――――――――――――――――― ―――――――――――― 577 ● ● ○ ○ Mercury lamp ――――――――――――――――――――――――――――――― ――――― 546 ● ○ ● ● Mercury lamp ―――――――――――――――――――――― ―――――――――――――― 435 ● ○ ● ○ Mercury lamp ――――――――――――――――――――――――――――― ――――――― 405 ● ○ ○ ● Mercury lamp ―――――――――――――――――――――――――――――――――― 365 ● ○ ○ ○ Mercury lamp ―――――――――――――――――――――――――――――――― 334 ○ ● ● ● Mercury lamp ―――――――――――――――――――――――――――――――――― 325 ○ ● ● ○ Halogen lamp ――――――― ――――――――――――――――――――――――――――― 313 ○ ● ○ ● Mercury lamp ―――――――――――――― ―――――――――――――――――――――― 302 ○ ● ○ ○ Mercury lamp ― ――――――――――――――――――――――――――――――――――― 296 ○ ○ ● ● Mercury lamp ―――――――― ―――――――――――――――――――――――――――― 280 ○ ○ ● ○ Mercury lamp ――――――――――――――― ――――――――――――――――――――― 253 ○ ○ ○ ● Mercury lamp ―――――――――――――――――――――― ―――――――――――――― User ● ● ● ● Option ―――――――――――――――――――――――――――――― ――――――

In the table, 表 indicates that the recognition hole was open, and ● indicates that it was closed. For example, the light receiving element 152
When the CPU 158 detects the reception of recognition light from the light emitting element 150 through the recognition holes D1 to D3,
Based on the table of 160, the type of the filter 116 used is automatically recognized as 365 nm.

When the wavelength setting filter 116 is replaced in this manner, the recognition hole, the light emitting element 150 and the light receiving element 15 are replaced.
The type of the filter 116 used, that is, the measurement wavelength is automatically recognized by the filter sensor such as 2 and the recognition means such as the CPU 158.

For this reason, when the wavelength setting filter 116 is replaced, mistakes in the recognition of the measured wavelength are greatly reduced, and the reliability of the analysis result is ensured, as compared with a filter without such contrivance. enable. In addition, the operation can be facilitated. And in the present embodiment, the CP
When U158 recognizes the measurement wavelength, it can output it to the outside by the output means.

For this purpose, the external controller 156 includes:
It includes display means 162 such as a liquid crystal display, and input means 164 such as a touch panel provided on the display and function keys provided on the controller body. A printer 166 is connected to the controller 156 via a printer interface (not shown).

Therefore, when the measurement wavelength is automatically recognized,
The CPU 158 displays the measurement wavelength on the screen of the display unit 162, and outputs the measurement wavelength to the printer 166 as a part of the measurement data.
Has been printed out. In this embodiment, when the measurement wavelength is automatically recognized, the CPU automatically performs the following hardware settings.

For example, in the present embodiment, as the light source 110 for optical rotation measurement, for example, a sodium lamp 110
a and the mercury lamp 110b are simultaneously mounted, and the light source to be used is switched by the switching means. Specifically, the switching means includes a drive unit 168 for enabling use of the sodium lamp 110a or the mercury lamp 110b, a drive circuit 170, and a control circuit such as a CPU 158.

Then, based on the recognized measurement wavelength, the CPU
158 controls the operation of the drive unit 168 and the drive circuit 170, and switches the light source to be used to the sodium lamp 110a or the mercury lamp 110b. Such a CPU
The switching process of the light source 110 performed by the light source 158 will be described in more detail. Specifically, the external controller 156
Are provided with slots into which various PC cards 172 are inserted.

As the PC card 172, for example, a data memory card capable of storing measurement conditions and data, a free calculation card capable of performing various arithmetic processing on measured data, and the like are used. First, which wavelength and which light source to use is determined in advance, and this is stored in the PC card 172 such as a data memory card. And
When the CPU 158 recognizes the type of the filter used, the CPU 158 accesses light source information of the PC card 172 or the like and selects an optimal light source for the wavelength.

After the selection, the CPU 158 causes the driving unit 168,
The driving circuit 170 is driven to switch the light source to be used. For example, the CPU 158 sets the type of the filter to be used to 365 nm.
If the PC card 172 stores the light source information as shown in Table 1, the switching is performed so that the mercury lamp can be selected and used.

As described above, in the present embodiment, different types of light sources, such as a sodium lamp and a mercury lamp, are mounted simultaneously, and when the measurement wavelength is automatically recognized, the used light source is automatically switched by the switching means. Compared to a device without such contrivance, it becomes possible to change the measurement wavelength and to facilitate the operation when changing the light source.

Next, the process of optimizing the gain of the drive circuit such as the servo amplifier 130 executed by the CPU 158 will be described. That is, the optimum gain of the servo amplifier 130 is sampled in advance for each measurement wavelength, and for example, a PC that stores a program or the like for determining the optimum gain is stored.
It is stored in a gain determination program storage means such as the card 172. After storage, when the CPU 158 or the like recognizes the type of the filter 116 used as described above,
The gain optimizing means such as U158 according to the program of the gain determining program storage means such as the PC card 172,
The optimum gain for the measurement wavelength is determined.

After the determination, when a measurement start instruction signal for instructing the start of measurement is input from the input means 164 or the like, the CPU 1
Reference numeral 58 controls the servo amplifier 130 with the optimum gain determined as described above. As described above, in the present embodiment, the provision of the means for optimizing the hardware setting such as the servo amplifier gain makes it possible to automatically optimize the hardware setting when the wavelength setting filter is replaced to change the measurement wavelength. Be transformed into This makes it possible to significantly reduce errors in hardware settings and the like suitable for the measurement wavelength, and to perform optical rotation measurement with higher accuracy and higher sensitivity than those without such contrivance. .

As described above, according to the multi-wavelength polarimeter according to one embodiment of the present invention, since the filter sensor and the recognition means are provided as described above, when the wavelength setting filter is replaced to change the measurement wavelength, The type of filter used is automatically recognized. For this reason, when replacing the wavelength setting filter, the error in recognition of the measurement wavelength and hardware setting suitable for the wavelength is greatly reduced, and the reliability of the analysis result is reduced. Nature can be secured. Further, the operation can be facilitated.

Further, different types of light sources such as a sodium lamp and a mercury lamp are simultaneously mounted, and the light source to be used is selectively switched by the switching unit based on the measurement wavelength obtained by the recognition unit. The operation can be facilitated as compared with a case where a light source is removed and replaced with a light source suitable for the measurement wavelength. In addition, the measurement wavelength obtained by the recognition means is displayed on the screen and printed out as a part of the measurement data, so that the user can easily confirm the measurement wavelength.

Further, by providing means for optimizing hardware settings such as the optimum gain of the servo amplifier based on the measured wavelength obtained by the recognition means, when the wavelength setting filter is replaced, the hardware is automatically replaced. Settings can be optimized. Therefore, as compared with a device without such contrivance, errors such as hardware setting suitable for the measurement wavelength are greatly reduced, and the optical rotation measurement can be performed with higher accuracy and sensitivity.

The multi-wavelength polarimeter of the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the invention. For example, in the embodiment, an example in which the recognition hole, the light emitting element, and the light receiving element are used for the filter sensor has been described. However, the present invention is not limited to this, and a mechanism as shown in FIGS. In FIG. 4, portions corresponding to those in FIG. 3 are denoted by reference numerals 100, and description thereof is omitted.

In the same figure, the filter sensor has unevenness 2
74 and an unevenness sensor 276. The irregularities 274 are
For each type of wavelength setting filter 216, a holder 248
At a predetermined site. For example, when the wavelength of the wavelength setting filter 216 is 365 nm, the convex portions 274a to 274a are output.
c, a concave portion 274d is provided.

Each of the unevenness sensors 276 is provided with the unevenness 27.
When the holder provided with 4 is disposed in a predetermined optical path of the polarimeter, the holder is switched on by the convex portions 274a to 274c and switched off by the concave portion 274d. Then, an identification signal by such switch ON / OFF is input to the CPU 258 via the interface 244, the CPU 246, and the interface 254.

Therefore, the CPU 258 recognizes the type of the filter 216 based on the identification signal. By using such a filter sensor such as the unevenness 274 and the unevenness sensor 276, similarly to the filter sensor shown in FIG. 3, only by disposing the holder 248 in a predetermined optical path of the optical system, the type of the filter 216 can be changed. Since the identification signal is automatically sent to the recognition means such as the CPU 258 and recognized, the type of the filter 216 used can be automatically recognized.

Further, a mechanism as shown in FIG. 5 can be used as the filter sensor. Note that the parts corresponding to those in FIG. 3 are denoted by reference numeral 200, and description thereof is omitted. In the figure, the filter sensor comprises a magnet 378,
Includes magnetic sensor 380. The magnet 378 is provided at a predetermined portion of the holder 348 for each type of the wavelength setting filter. For example, if the wavelength of the wavelength setting filter is 3
In the case of 65 nm, magnets 378a to 378c are provided.

When such a holder 348 is arranged in a predetermined optical path of the polarimeter, the magnetic sensor
The presence or absence of the magnetism is detected from 78, and the arrangement of the magnet is input to the recognition means such as the CPU 358 based on the presence or absence of such magnetism. Therefore, the CPU 358 can automatically recognize the type of the filter based on the identification signal.

By using such a filter sensor, similarly to the filter sensor shown in FIG. 3, the identification signal of the type of the wavelength setting filter can be automatically obtained only by disposing the holder in a predetermined optical path of the optical system. Since it is sent to the recognition means such as the CPU 358 and recognized, the type of filter used can be recognized. In each of the above embodiments, the timing for automatically recognizing the type of filter is not limited.

For example, the type of filter may be automatically recognized when the polarimeter main body is turned on and started. Also, while the power is ON, the filter automatic recognition function is always operated, and when the used filter is replaced, the CPU or the like can perform the filter recognition and the hardware optimization without restarting the system. Etc. may be performed automatically.

In consideration of power saving, even if the automatic recognition function is not always operated as described above, for example, in the power saving mode during measurement or the like, the recognition of the type of the filter is started by the input means or the like. The recognition function may be switched to the normal mode, for example, when a signal instructing is input or when the filter replacement is automatically recognized. Further, in the above embodiment, an example in which the gain of the servo amplifier is directly optimized as the optimization of the hardware setting has been described. However, the present invention is not limited to this, and instead, first,
The current of the Faraday cell may be optimized.

Hereinafter, the Faraday cell current optimization process that can be executed by the CPU or the like will be described with reference to FIGS. First, data showing the relationship between the measured wavelength and the Faraday cell modulation angle when the current of the Faraday cell as shown in FIG. 6I is constant, and the modulation angle as shown in FIG. Data indicating the relationship between the measured wavelength and the Faraday cell current at the time of the
Is stored in the current determination program storage means.

After the storage, the type of the filter 316 used by the CPU 358 is automatically recognized as described above in FIG.
Determines the optimal Faraday cell current for the wavelength according to the program of the current determination program storage means of the PC card 372 or the like. That is, the current information of the Faraday cell 320 is determined such that the modulation angle of the Faraday cell 320 does not change before and after the replacement of the filter 316.

After the determination, when a measurement start instruction signal for instructing the start of measurement is input from the input means 364 or the like, the CPU 3
Numeral 58 controls hardware such as the Faraday cell 320 with the current value optimized as described above. As described above, when the wavelength setting filter 316 is replaced, by maintaining the modulation angle of the Faraday cell 320 constant before and after the replacement, the CPU 358 can control only the voltage of the detector 336 such as a photomultiplier tube. Servo amplifier 3
A gain of 30 can also be maintained optimally.

[0059]

As described above, according to the multi-wavelength polarimeter according to the present invention, for each wavelength of the wavelength setting filter,
A filter sensor capable of outputting a predetermined identification signal, and recognition means for recognizing the wavelength of the wavelength setting filter based on the identification signal from the filter sensor are provided, so if the wavelength setting filter is replaced to change the measurement wavelength, The type of filter used, that is, the measurement wavelength is automatically recognized. For this reason, when replacing the wavelength setting filter in order to change the measurement wavelength, the error in recognition of the measurement wavelength and hardware setting suitable for it are greatly reduced, compared to the case without such a device. The reliability of the analysis result can be ensured. Further, the operation can be facilitated. In the multi-wavelength polarimeter, different types of light sources such as a sodium lamp and a mercury lamp are simultaneously mounted, and the light source to be used is selectively switched by the switching unit based on the measurement wavelength obtained by the recognition unit. This makes it easier to change the measurement wavelength and to change the light source as compared to a device without such a device. Also,
The multi-wavelength polarimeter includes an output unit capable of outputting the measurement wavelength obtained by the recognition unit, so that a user can easily confirm the measurement wavelength. Further, in the multi-wavelength polarimeter, based on the measurement wavelength obtained by the recognition means, by including a means for optimizing hardware settings such as the current of the Faraday cell and the gain of a drive circuit such as a servo amplifier, When the wavelength setting filter is changed to change the measurement wavelength, the hardware setting is automatically optimized. For this reason, as compared with a device without such contrivance, errors such as hardware setting suitable for the measurement wavelength are greatly reduced, and the optical rotation measurement can be performed with higher precision and sensitivity.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a general polarimeter.

FIG. 2 is an explanatory view of a characteristic holder in the multi-wavelength polarimeter according to one embodiment of the present invention.

FIG. 3 is an explanatory diagram of a filter sensor and the like including the holder shown in FIG. 2;

FIG.

FIG. 5 is a modification of the filter sensor shown in FIG.

FIG. 6 shows the wavelength when the current of the Faraday cell is constant.
It is a modulation angle characteristic and a wavelength-current characteristic when the modulation angle is fixed.

[Explanation of symbols]

 110a, 110b: light source 116: wavelength setting filter 148: holder 150: light emitting element (filter sensor) 152: light receiving element (filter sensor) D1 to D4: recognition hole (filter sensor)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takashi Takakuwa 2967-5, Ishikawa-cho, Hachioji-shi, Tokyo Nippon Bunko Co., Ltd. (72) Inventor Kiyoshi Yajima 5-2, 2967 Ishikawa-cho, Hachioji-shi, Tokyo Japan Nippon Bunko Co., Ltd. F term (for reference) 2G059 EE05 EE11 GG03 HH01 HH02 HH03 JJ02 JJ11 JJ18 JJ19 KK01 KK02 MM01 MM01 MM10 MM14 PP03 PP04

Claims (10)

[Claims] A light source that emits a light beam; a wavelength setting filter that allows a light beam having a predetermined wavelength to pass through the light beam from the light source; A Faraday cell that modulates the polarization direction of linearly polarized light from the polarizer; a cell filled with a sample and arranged so that a light beam from the Faraday cell passes through the sample; An analyzer that is arranged at a predetermined angle with respect to the analyzer and passes a light beam having a polarization plane at a certain angle out of the light beams that have passed through the sample, and a detector that detects the light amount of the light beam that has passed through the analyzer, A multi-wavelength polarimeter that can replace the wavelength setting filter having a different wavelength, wherein a filter sensor capable of outputting a predetermined identification signal for each wavelength of the wavelength setting filter; A recognizing means for recognizing a wavelength of a wavelength setting filter arranged in a predetermined optical path of the multi-wavelength polarimeter based on an identification signal from the filter sensor. 2. The multi-wavelength polarimeter according to claim 1, wherein
A holder configured to hold the wavelength setting filter in a predetermined optical path; the filter sensor includes a recognition hole provided in a predetermined portion of the holder for each wavelength of the wavelength setting filter; A light-emitting element capable of entering recognition light into the hole, provided on the opposite side of the light-emitting element with the recognition hole interposed therebetween, and capable of receiving recognition light from the light-emitting element through the recognition hole; A multi-wavelength polarimeter, comprising: a light-receiving element capable of outputting the presence or absence to the recognition means. 3. The multiwavelength polarimeter according to claim 1, wherein:
A holder capable of holding the wavelength setting filter in a predetermined optical path; the filter sensor detects, for each wavelength of the wavelength setting filter, unevenness provided on a predetermined portion of the holder and the unevenness And a concavo-convex sensor capable of outputting to the determination means. 4. The multi-wavelength polarimeter according to claim 1, further comprising: a holder capable of holding the wavelength setting filter in a predetermined optical path; For each wavelength of the filter, a magnet provided at a predetermined portion of the holder, and a magnetic sensor capable of detecting presence or absence of magnetism from the magnet and outputting to the recognition means is provided. Multiwavelength polarimeter. 5. The multi-wavelength polarimeter according to claim 1, wherein two or more light sources of different types are simultaneously mounted as said light source, and a light source optimal for a measurement wavelength obtained by said recognition means. A multi-wavelength polarimeter comprising switching means for selecting one of the light sources from the two or more light sources so that the light source can be used. 6. The multi-wavelength polarimeter according to claim 1, further comprising an output unit capable of outputting the measured wavelength information obtained by said recognition unit to an external device. Polarimeter. 7. The multi-wavelength polarimeter according to claim 1, wherein, when the wavelength setting filter is replaced, the Faraday cell does not change before and after the replacement. A multiwavelength polarimeter comprising a current optimizing means for optimizing a cell current. 8. The multi-wavelength polarimeter according to claim 7, wherein
For each measurement wavelength, comprises a current determination program storage means for storing a program for determining the optimal current of the Faraday cell, The current optimization means, according to the program stored in the current determination program storage means, A multiwavelength polarimeter, which determines an optimal current of a Faraday cell for a measurement wavelength obtained by a recognition unit. 9. The multi-wavelength polarimeter according to any one of claims 1 to 6, wherein an adjusting means is capable of adjusting an angle so that a polarization direction of the polarizer and a transmission axis direction of the analyzer are orthogonal to each other; A driving circuit for driving the adjusting unit; and a gain optimizing unit for optimizing a gain of the driving circuit based on the measured wavelength obtained by the recognizing unit. Polarimeter. 10. The multi-wavelength polarimeter according to claim 9, further comprising: a gain determining program storing means for storing a program for determining an optimum gain of the driving circuit for each measurement wavelength, wherein the gain optimizing means is provided. Is a multi-wavelength polarimeter, which determines a gain of the drive circuit, which is optimal for the measurement wavelength obtained by the recognition means, according to a program stored in the gain determination program storage means.