WO2008075445A1 - 原子吸光分光光度計 - Google Patents
原子吸光分光光度計 Download PDFInfo
- Publication number
- WO2008075445A1 WO2008075445A1 PCT/JP2007/001190 JP2007001190W WO2008075445A1 WO 2008075445 A1 WO2008075445 A1 WO 2008075445A1 JP 2007001190 W JP2007001190 W JP 2007001190W WO 2008075445 A1 WO2008075445 A1 WO 2008075445A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- transmittance
- atomic absorption
- light
- absorption spectrophotometer
- lamp
- Prior art date
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
- G01N21/274—Calibration, base line adjustment, drift correction
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/3103—Atomic absorption analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
- G01N21/3151—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths using two sources of radiation of different wavelengths
Definitions
- the present invention relates to an atomic absorption spectrophotometer, and more particularly to an atomic absorption spectrophotometer that uses a plurality of light sources such as a holocathode lamp and a deuterium lamp simultaneously.
- an atomic absorption spectrophotometer that uses a plurality of light sources simultaneously, for example, an atomic absorption spectrophotometer having a function of correcting background absorption by using a holo-force lamp and a deuterium lamp together is provided. is there.
- the light beam emitted from the holo-force sword lamp and the light beam emitted from the deuterium lamp are combined into one by, for example, a beam combiner, and after passing through the atomized atomized space of the analysis sample solution, When introduced, it becomes light in the required wavelength range. The light then enters the photoelectric detector, is converted into an electrical signal proportional to the intensity of the light, and is further logarithmically converted.
- the luminous flux from the holocaust lamp is absorbed by the background and the atoms to be analyzed, and the luminous flux from the deuterium lamp is absorbed by the background (absorption by atoms is negligible because the wavelength range is narrow). Since the logarithmically converted signal is proportional to the intensity of absorption, the difference between the signals obtained by logarithmically converting the electrical signal proportional to the intensity (light intensity) of both beams is eliminated by the effect of background absorption. Proportional to yield strength.
- the logarithmic conversion circuit for logarithmically converting a signal as described above has a limited signal range in which it can operate properly. If the signal is too small, the conversion accuracy decreases. For this reason, it is necessary to make the magnitude of the electrical signal obtained by photoelectrically converting the light from the holo-power sword lamp input to the logarithmic converter circuit equal to the magnitude of the electrical signal obtained by photoelectrically converting the light from the deuterium lamp. is there.
- each lamp adjusts the amplification factor of the electric circuit corresponding to each lamp to equalize the magnitude of the electric signal corresponding to both lamps, or (2) each lamp Power to adjust the power supplied to the lamp to equalize the magnitude of the electrical signal corresponding to both lamps, or (3)
- the transmittance changes step by step between each lamp and beam combiner A dimming device is installed and the intensity of the electric signal is made uniform by adjusting the light quantity of both lamps.
- Patent Document 1 Japanese Patent Application Laid-Open No. 60_3 7 5 1 8
- the present invention has been made to solve the above-described problems, and the object of the present invention is to reduce the deterioration of the SN ratio and to make the light quantity of the lamp unstable or shorten the life. And an atomic absorption spectrophotometer capable of equalizing the light amounts of a plurality of lamps (light sources) used simultaneously. Means for solving the problem
- a first invention made to solve the above problems is an atomic absorption spectrophotometer comprising: a plurality of light sources; and a beam combiner that combines a plurality of light beams emitted from these light sources into one.
- the plurality of light sources may be a deuterium lamp and a holocaust lamp.
- a second invention made to solve the above-described problem includes a deuterium lamp, a hollow cathode lamp, and a beam combiner that combines two light beams emitted from these lamps.
- a deuterium lamp a hollow cathode lamp
- a beam combiner that combines two light beams emitted from these lamps.
- variable transmittance dimming means disposed in a light path between the deuterium lamp and the beam combiner
- each of the atomic absorption spectrophotometers according to the first and second inventions, the amount of light from each light source (holopower sword lamp and deuterium lamp) is substantially equalized by the action of each means described above.
- This equalization of the light intensity of multiple lamps (light sources) can be applied to many types of lamps, has a good S / N ratio, and functions without destabilizing the lamp light intensity or shortening its life. Therefore, it is possible to perform atomic absorption spectrometry with good efficiency.
- FIG. 1 is a schematic configuration diagram of an atomic absorption spectrophotometer that is one embodiment (first embodiment) of the present invention.
- FIG. 2 is a diagram showing an outline of an optical filter mounted on a dimming device in the atomic absorption spectrophotometer of this example.
- FIG. 3 is a diagram showing an outline of an optical filter mounted on a light reducing device in an atomic absorption spectrophotometer which is a modification of the present invention.
- FIG. 4 is a diagram showing an outline of a dimming device of a modification.
- FIG. 5 Diagram showing the outline of the dimming element (linear arrangement type) installed in the dimming device of the modification.
- FIG. 6 The dimming element (circular arrangement type) mounted in the dimming device of the modification.
- FIG. 7 is a schematic configuration diagram of an atomic absorption spectrophotometer which is another embodiment (second embodiment) of the present invention.
- FIG. 8 is a diagram showing an outline of the attenuation attenuator in the atomic absorption spectrophotometer of the second embodiment.
- Second dimming device (dimming device)
- the dimming means includes: an optical filter whose absorption characteristic to wavelength is substantially flat and whose transmittance changes continuously; And a driving means for moving the appropriate portion to a position where the light beam from the light source passes.
- the driving means may be constituted by a stepping motor and a linear driving mechanism including, for example, a rack and a pinion.
- the drive unit can be composed of a stepping motor.
- FIG. 1 is a schematic configuration diagram of the atomic absorption spectrophotometer of the first embodiment.
- FIG. 2 is a diagram showing an outline of an optical filter mounted on a dimming device included in the atomic absorption spectrophotometer of the first embodiment.
- the first light source 1 is composed of a holographic lamp, and is lit intermittently at 60 Hz, for example.
- the second light source 2 is composed of a deuterium lamp and is lit intermittently so that the first light source 1 is lit when not lit.
- the first dimming device 3 is disposed between the first light source 1 and the beam combiner 5, and the second dimming device 4 is disposed between the second light source 2 and the beam combiner 5.
- the light beam emitted from the first light source 1 and the light beam emitted from the second light source 2 are combined into one by the beam combiner 5 composed of a half mirror, and the direction is changed by the mirror 6 to change the direction of the furnace atomization unit. It passes through the measurement unit 7 which is The direction of the light is further changed by another mirror 8, and only the light in the necessary wavelength region is selected by being introduced into the spectrometer 9, and is incident on the photoelectric detector 10 composed of, for example, a photomultiplier tube. Converted into a current signal. The current signal of the photoelectric detector 10 becomes a voltage signal whose magnitude is proportional to the amount of light in the preamplifier 11.
- the output signal of the preamplifier 1 1 alternately appears as a signal corresponding to the first light source 1 and a signal corresponding to the second light source 2, and is sampled in synchronization with the lighting periods of the light sources 1 and 2. Both are separated.
- the output signal of the preamplifier 1 1 is logarithmically converted by the logarithmic converter circuit 1 2 and becomes a signal proportional to the light absorption in the space where the sample solution is atomized and atomized in the measurement unit 7.
- the signal corresponding to the first light source 1 is proportional to the absorption by the background of the space and the atoms for analysis
- the signal corresponding to the second light source 2 is absorbed by the background (absorption by the atoms is the wavelength). It can be ignored because the area is narrow).
- Display 13 corrects the absorption due to the background and calculates and displays the concentration of the atom for analysis.
- Each of the first dimming device 3 and the second dimming device 4 is mixed in a substrate such as glass.
- An optical filter 31 (see FIG. 2) whose transmittance continuously changes in a linear direction due to a lateral change in the concentration of the metal, etc. Consists of including.
- the relationship between the transmittance of the first dimming device 3 and the number of driving steps of the stepping motor is expressed by the following equation (1), and the same relationship of the second dimming device 4 is expressed by the equation (2). Equations (1) and (2) are stored in the storage unit 16.
- T a is the transmittance of the first dimming device 3
- Ka is a constant
- N a is the number of drive steps to the stepping motor of the first dimming device 3
- T b is the transmittance of the second dimming device 4.
- Kb constant
- N b number of drive steps to the stepping motor of the second dimmer 4. Therefore, when the first dimming device 3 or the second dimming device 4 is set to the target transmittance, the control unit 15 is connected to the first dimming device 3 or the second dimming device via the dimming device driving unit 18.
- the stepping motor of optical device 4 is driven by the number of steps determined by equation (1) or equation (2).
- the measuring unit 7 is empty, and the transmittance of the first dimming device 3 and the second dimming device 4 is maximized (
- the corresponding value P b and the force control unit 15 are stored in the storage unit 16 through the control unit 15.
- the control unit 15 reads the appropriate transmittances T 1 and T 2 calculated by the appropriate transmittance calculation unit 17 and determines the transmittance of the first dimming device 3 via the dimming device driving unit 18.
- P bx (P s / P b) P s
- the light quantities of both light sources 1 and 2 are equalized.
- the maximum transmittance that can be set for the first dimming device 3 and the second dimming device 4 is not 100% due to the influence of the surface reflection of the optical filter 31, etc., but the error is about several percent at most. Therefore, it has almost no effect on the light leveling performance.
- the value of P s is optimized by changing the sensitivity of the photoelectric detector 10 so that the logarithmic conversion circuit 12 can be converted to a logarithm with high accuracy.
- the first light source Since the atomic absorption spectrophotometer of the first embodiment has the above configuration, the first light source
- the equalization of the light quantity of 1 and 2 light source 2 can be applied to many kinds of lamps, has a good S / N ratio, functions without destabilizing the lamp light quantity and shortening the service life, It is possible to provide an apparatus capable of performing atomic absorption spectrometry with high accuracy and high efficiency by accurately correcting ground absorption.
- the atomic absorption spectrophotometer according to the first invention is not limited to the description of the first embodiment.
- the number of light sources N is two, but even when N is composed of three or more light sources, N_ 1 beam combiners 5 are provided and N It is possible to apply the present invention by making the luminous flux of each light source one.
- Each of the first dimming device 3 and the second dimming device 4 includes an optical filter 3 1 and a stepping motor that moves the optical filter 3 1 in a linear direction via a rack and a pinion.
- the transmittance continuously changes in the circumferential direction due to a change in the circumferential direction of the concentration of metal or the like mixed in the substrate such as glass.
- the rack and pinion may be deleted, and the optical filter 32 may be replaced with a dimming device composed of a stepping motor that moves directly in the circumferential direction.
- the first dimming device 3 and the second dimming device 4 are constituted by the optical filter 3 1 and a stepping motor that moves the optical filter 3 1 in a linear direction via a rack and a pinion.
- the first dimming device 3 and the second dimming device 4 are configured to include the optical filter 31, but instead of the optical filter 31, a fine opening in a thin plate A dimming element composed of a dimming element 3 5 (see Fig. 5) whose transmissivity varies continuously in the horizontal direction by changing the number of holes per unit area in the horizontal direction. It is good also as a structure replaced with the apparatus.
- the first dimming device 3 and the second dimming device 4 are composed of the optical filter 3 1 and a stepping motor that moves the optical filter 3 1 in a linear direction via a rack and a pinion.
- the optical filter 31 instead of the optical filter 31, a large number of fine openings are provided in the thin plate, and the transmittance is continuously changed in the circumferential direction by changing the diameter of the opening in the circumferential direction and the number of holes per unit area.
- the atomic absorption spectrophotometer according to the first invention can have various configurations, and the first invention includes these modifications.
- FIG. 7 is a schematic configuration diagram of the atomic absorption spectrophotometer of the second embodiment.
- FIG. 8 is a diagram showing an outline of the light attenuation attenuator 20 in the atomic absorption spectrophotometer of the second embodiment. Constituent elements that are the same as or correspond to those in the first embodiment are given the same reference numerals, and detailed descriptions thereof are omitted.
- the dimming device 4 corresponding to the second dimming device 4 in the first embodiment is provided between the second light source 2 that is a deuterium lamp and the beam combiner 5.
- the dimming attenuator 20 corresponds to the optical filter in the first embodiment, and has a structure in which a plurality of filters having different transmittances are arranged in a horizontal direction (see FIG. 8). )
- the relationship between the transmittance of the dimming attenuator 20 and the number of steps of the stepping motor of the drive mechanism 19 is expressed by the following equation (3), and this equation is stored in the storage unit 16.
- T a is the transmittance of the dimming attenuator 20
- K a is a constant
- N a is the number of steps of the stepping motor of the drive mechanism 19. Therefore, when the dimming attenuator 20 is set to the desired transmittance, the control unit 15 determines the stepping motor of the drive mechanism 19 via the dimming device driving unit 18 according to equation (3). Drive to the number of steps.
- the output voltage of the preamplifier 1 1 is A / D converted by the A / D converter 1 4
- the value P h corresponding to the first light source (holopower sword lamp) 1 and the value P d corresponding to the second light source (deuterium lamp) 2 are stored in the storage unit 16 via the control unit 15. Saved.
- the control unit 15 reads the appropriate transmittance T3 calculated by the appropriate transmittance calculation unit 17 and drives the stepping motor of the drive mechanism 19 via the dimming device driving unit 18 to reduce the amount.
- the appropriate transmittance T 3 (P h / P d) may not always match XK b.
- the transmittance closest to the appropriate transmittance T 3 is selected and set.
- the maximum transmittance that can be set for the dimming attenuator 20 is not 100% due to the effect of surface reflection, etc., but the error is only a few percent, and it has little effect on the light leveling performance. Absent.
- the value of Ph is optimized by changing the sensitivity of the photoelectric detector 10 so that the logarithmic conversion circuit 12 can be converted into a logarithm with high accuracy.
- the SN ratio is improved in an element such as arsenic, selenium, tin, etc., in which the light amount of the first light source 1 becomes extremely smaller than the light amount of the second light source 2.
- the transmittance of the dimming attenuator 20 is set to approximately 11%, and the standard deviation of the baseline measurement is 0.0 0 1 1 A About bs.
- the atomic absorption spectrophotometer of the second embodiment has the above configuration, the first light source
- the equalization of the light quantity of 1 and 2 light source 2 can be applied to lamps of many kinds of elements, the SN ratio is good, the lower limit of quantification and detection limit of analysis is improved, and the lamp light quantity becomes unstable. It is possible to provide a device that functions without shortening the service life, accurately corrects background absorption, and performs atomic absorption spectrometry with high accuracy and efficiency.
- the configuration shown in FIG. 7 employs a single beam optical system, but it is clear that the present invention can also be applied to an atomic absorption spectrophotometer employing a double beam optical system. It is. Further, instead of using the measurement unit 7 as a furnace atomization unit, the sample solution may be atomized and atomized by flame heat. The same applies to the first embodiment.
- the dimming attenuator 20 is configured to be moved in the linear direction by the drive mechanism 19 including a rack, a pinion, a stepping motor, and the like.
- the attenuator 20 is replaced with an optical element whose transmittance changes stepwise in the circumferential direction, the rack and pinion are deleted, and this optical element is moved in the circumferential direction by a driving means composed of a stepping motor. May be.
- the attenuation attenuator 20 is composed of a plurality of optical filters whose transmittance changes stepwise, but the attenuation attenuator 20 is replaced with a glass or the like.
- An optical element whose transmittance continuously changes in the horizontal direction due to a horizontal change in the concentration of metal or the like mixed in the base material, that is, the optical filter employed in the first embodiment may be used.
- the atomic absorption spectrophotometer according to the second invention can also have various configurations, and the second invention includes these modifications.
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Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200780044750.7A CN101548173B (zh) | 2006-12-18 | 2007-10-31 | 原子吸收分光光度计 |
JP2008550033A JP4853522B2 (ja) | 2006-12-18 | 2007-10-31 | 原子吸光分光光度計 |
US12/515,487 US8184286B2 (en) | 2006-12-18 | 2007-10-31 | Atomic absorption spectrophotometer |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2006339560 | 2006-12-18 | ||
JP2006-339560 | 2006-12-18 | ||
JP2007-072410 | 2007-03-20 | ||
JP2007072410 | 2007-03-20 |
Publications (1)
Publication Number | Publication Date |
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WO2008075445A1 true WO2008075445A1 (ja) | 2008-06-26 |
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ID=39536084
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2007/001190 WO2008075445A1 (ja) | 2006-12-18 | 2007-10-31 | 原子吸光分光光度計 |
Country Status (4)
Country | Link |
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US (1) | US8184286B2 (ja) |
JP (1) | JP4853522B2 (ja) |
CN (1) | CN101548173B (ja) |
WO (1) | WO2008075445A1 (ja) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102053064B (zh) * | 2009-11-10 | 2012-10-03 | 北京博晖创新光电技术股份有限公司 | 多样本、多元素同时测量的钨舟原子吸收分析方法和装置 |
CN102184834B (zh) * | 2011-04-21 | 2013-06-26 | 齐齐哈尔医学院 | 空心阴极灯及由该空心阴极灯制作的原子吸收光谱仪 |
EP2927667A4 (en) * | 2012-11-05 | 2016-06-29 | Shimadzu Corp | ATOMIC ABSORPTION SPECTROPHOTOMETER AND METHOD OF OPTIMIZING SIGNAL VOLTAGE USED THEREIN |
CN104849213B (zh) * | 2014-02-19 | 2017-12-29 | 赛默飞世尔(上海)仪器有限公司 | 光源以及光学测量系统 |
EP3467480B1 (en) * | 2016-05-30 | 2023-08-23 | Nikon Corporation | Observing device and observing method |
CN109564152A (zh) * | 2016-07-25 | 2019-04-02 | 株式会社岛津制作所 | 光度计 |
JP7211033B2 (ja) * | 2018-11-27 | 2023-01-24 | 株式会社島津製作所 | 原子吸光分光光度計 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5558439A (en) * | 1978-10-27 | 1980-05-01 | Hitachi Ltd | Optical system for atomic light absorption analyzer |
JPS6210375B2 (ja) * | 1981-03-24 | 1987-03-05 | Shimadzu Corp | |
JP2001153791A (ja) * | 1999-11-30 | 2001-06-08 | Olympus Optical Co Ltd | 光検出装置 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6037518A (ja) | 1983-08-10 | 1985-02-26 | Shimadzu Corp | 原子吸光分析用ビ−ムコンバイナ− |
US6720745B2 (en) * | 1997-08-26 | 2004-04-13 | Color Kinetics, Incorporated | Data delivery track |
AU2002245345A1 (en) * | 2001-01-30 | 2002-08-12 | Board Of Trustees Operating Michigan State University | Control system and apparatus for use with laser excitation or ionization |
CN100357719C (zh) * | 2003-11-28 | 2007-12-26 | 上海天美科学仪器有限公司 | 宽范围氘灯背景校正系统 |
-
2007
- 2007-10-31 US US12/515,487 patent/US8184286B2/en active Active
- 2007-10-31 CN CN200780044750.7A patent/CN101548173B/zh not_active Expired - Fee Related
- 2007-10-31 JP JP2008550033A patent/JP4853522B2/ja active Active
- 2007-10-31 WO PCT/JP2007/001190 patent/WO2008075445A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5558439A (en) * | 1978-10-27 | 1980-05-01 | Hitachi Ltd | Optical system for atomic light absorption analyzer |
JPS6210375B2 (ja) * | 1981-03-24 | 1987-03-05 | Shimadzu Corp | |
JP2001153791A (ja) * | 1999-11-30 | 2001-06-08 | Olympus Optical Co Ltd | 光検出装置 |
Also Published As
Publication number | Publication date |
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CN101548173A (zh) | 2009-09-30 |
US8184286B2 (en) | 2012-05-22 |
US20100073675A1 (en) | 2010-03-25 |
CN101548173B (zh) | 2013-07-31 |
JPWO2008075445A1 (ja) | 2010-04-08 |
JP4853522B2 (ja) | 2012-01-11 |
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