JP2009281911A - Analyzing apparatus - Google Patents

Abstract

To provide a colorimetric analysis of a substance to be analyzed using a larger number of types of detection agents by a simple and inexpensive apparatus for detecting a change in visible absorption spectrum.
A light source 101, a detection unit 102, a wavelength conversion unit 103, a light receiving unit 104, and a density calculation unit 105 are provided. The light source light emitted from the light source 101 is transmitted through the detection unit 102, and the transmitted light transmitted through the detection unit 102 is transmitted through the wavelength conversion unit 103 and received by the light receiving unit 104. The wavelength conversion unit 103 converts light having a wavelength in the absorption spectrum of the detection agent in light emitted from the light source 101 and transmitted through the detection hand unit 102 into light having a longer wavelength. The wavelength conversion unit 103 is constituted by a fluorescent film prepared by mixing a fluorescent pigment such as DAPI with a polymer such as polyethylene, for example.
[Selection] Figure 1

Description

  The present invention relates to an analyzer for performing analysis such as concentration measurement of a target substance by colorimetric analysis.

  Colorimetric analysis, which performs analysis such as concentration measurement of analytes based on changes in color due to the reaction between the analyte and detection reagent (detection agent), is a relatively simple analysis method, such as environmental analysis and biochemistry. Widely used in the field. In colorimetric analysis, generally, a change in a light absorption spectrum in a visible region of a reagent or a substance to be analyzed is measured by a reaction between a detection agent and a substance to be analyzed.

Regarding colorimetric analysis, for example, detector tubes (such as those manufactured by Gastec) widely used for work environment measurement and process control, and formaldehyde that changes from a transparent state to a yellow state due to the presence of formaldehyde There are a detection tag (see Non-Patent Document 1), a formaldehyde test strip “Doctor Sick House (registered trademark)” manufactured by Kanto Chemical Co., Ltd. (see Non-Patent Documents 2 and 3), and the like. Further, there are formaldehyde solid-state colorimetric color recognition materials (see Non-Patent Document 4) and formaldehyde detection elements (see Non-Patent Document 5). In addition, an ozone detection element (Non-patent Document 6) in which blue changes to a nearly colorless state due to the presence of ozone, a NO ₂ detection element (Non-patent Document 7), and the like have been reported.

  The colorimetric analysis technique described above makes it possible to measure the concentration roughly by visual observation by clarifying the relationship between the change in color (absorption spectrum) and the detected amount of the analyte, as well as the color change. More accurate measurement is performed by measuring with a spectrophotometer (see Non-Patent Document 8). Moreover, the density | concentration is also calculated by analyzing the image of the detection material image | photographed with the digital camera generally spread widely using computer equipment (refer nonpatent literature 4).

Y. Suzuki, et al., "" Portable Sick House Syndrome Gas Monitoring System Based on Novel Colormetric Regents for the Highly Selective and Sensitive Detection of Formaldehyde ", Environ. Soc. Technol., Vol.37, pp.5695-5700, 2003. Kan Chemical Co., Ltd. website http://www.kanto.co.jp/siyaku/hcho/index.htm Slides from the 37th Annual Meeting of the Japanese Pharmacists Association http://www.kanto.co.jp/siyaku/pdf/37-B.pdf Atsuko Tsuda et al., “Development of solid-phase colorimetric material for formaldehyde”, Journal of Indoor Environment Society, Vol.9, No.2, pp.124-125, 2006. Maruko Yoko et al., “Development of formaldehyde detectors using porous glass and β-diketones”, Environmental Chemistry, Vol.17, No.3, pp.413-419, 2007. Maruko Yoko et al., “Development of ozone detectors”, 17th Annual Meeting of the Japan Ozone Society, 167 pages, 2007. T. Tanaka, et al., "Coloration reactions between NO2 and organic compounds in porous glass for cumulative gas sensor", Sensors and Actuators B, Vol.47, pp.65-69, 1998. Maruko Yoko et al., “Measurement of photochemical oxidant using color sensor network”, NTT Technical Journal, Vol.19, No.12, pp.16-19, 2007. Invitrogen website, http://www.invitrogen.co.jp/catalogue/molecular_probes/alexa/alexa_index.html, fluorescent dyes manufactured by Molecular Probes Katsuhei Yoshida et al., “Development of wavelength-converting illuminant-free luminescent dyes and their application to agriculture”, http://www.joho-kochi.or.jp/johosi/0609/rsp.html Nippon Soda, "Fluorescent dyes with wavelength conversion function in agriculture", Polyfile, Vol.32, No.7, pp.22-23, 1995. Ota Noboru, “Basics of Color Reproduction Optics”, Corona Co., Ltd., 4th printing, 2006. Olympus Corporation website, http://olympus-imaging.jp/product/dslr/e330/feature/index3.html, http://support.olympus.co.jp/en/support/dlc/archive/e330.pdf

  The detection agent generally used in the colorimetric analysis described above has an absorption spectrum that changes in the visible light region due to the reaction with the analyte, but some of the detection agents are in the ultraviolet region due to the reaction with the analyte. There are many cases in which the absorption spectrum changes due to, and the peak of the changing absorption spectrum is close to the ultraviolet region. When such a detection agent is used, the change in the absorption spectrum cannot be visually determined. For example, in formaldehyde detection of Non-Patent Document 5, the absorbance changes greatly at a wavelength of 406 to 411 nm due to reaction with formaldehyde.

  Such a change in the absorption spectrum having a wavelength close to the ultraviolet region is difficult to be recognized by the human eye, and there is a problem in that the measurement result cannot be sufficiently evaluated by visual observation. Even when an inexpensive stimulus value direct-reading colorimeter (photoelectric colorimeter) is used, the spectral response at a wavelength of 430 nm or less of this apparatus is not so high, so that sufficient measurement accuracy cannot be obtained.

  Further, there is an ozone detection method (JIS B 7957) in which iodine liberated by the reaction between neutral potassium iodide and ozone is measured by absorbance at a wavelength of 365 nm. In the case of this analysis method, since the target measurement wavelength is a region that is not sensitive to human eyes or photoelectric colorimeters, visual and photoelectric colorimeters cannot be used. Will be used. Further, as a cheaper simple type or portable type device, there is an apparatus in which an LED emitting a wavelength corresponding to an absorption wavelength (peak wavelength) is used as a light source, and transmitted light or reflected light is detected by a photodiode. However, even such an apparatus is not cheap at around several tens to millions of yen.

  As explained above, colorimetric analysis using a detection agent that changes its absorption spectrum in the ultraviolet region or a wavelength close to it by reaction with the analyte, makes it easy and inexpensive to detect changes in the absorption spectrum in the visible region. There is a problem that it is impossible to use a simple device. In other words, when using an inexpensive apparatus, there is a problem that there is a limit to the detection agent that can be used.

  The present invention has been made in order to solve the above-described problems, and an analysis using more types of detection agents by a simple and inexpensive apparatus for detecting a change in absorption spectrum in the visible region. The purpose is to enable colorimetric analysis of target substances.

  The analysis apparatus according to the present invention includes a detection unit including a detection agent whose absorption spectrum changes due to a reaction with a measurement target substance, a light source that includes light having a wavelength of the absorption spectrum in the emitted light, and a detection unit that is emitted from the light source and detected. Wavelength conversion means for converting the first light having the wavelength of the absorption spectrum in the light transmitted or reflected through the light into the second light having a longer wavelength.

  In the analyzer, the wavelength conversion means converts first light having a wavelength of 430 nm or less into second light having a wavelength exceeding 430 nm. For example, the wavelength conversion means includes a phosphor.

  The analyzer includes light receiving means for receiving the second light converted by the wavelength converting means and converting it into an electrical signal.

  In the analyzer, the detection agent only needs to contain neutral potassium iodide. Further, the detection agent may contain β-diketone.

  As described above, according to the present invention, the wavelength for converting the first light having the wavelength of the absorption spectrum in the light emitted from the light source and transmitted or reflected by the detection means to the second light having a longer wavelength. Since the conversion means is used, it is possible to perform colorimetric analysis of analytes using more types of detection agents with a simple and inexpensive device that detects changes in the absorption spectrum in the visible range. Excellent effect is obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing a configuration of an analyzer according to an embodiment of the present invention. The analyzer includes a light source 101, a detection unit 102, a wavelength conversion unit 103, a light receiving unit 104, and a concentration calculation unit 105. The light source light emitted from the light source 101 is transmitted through the detection unit 102, and the transmitted light transmitted through the detection unit 102 is transmitted through the wavelength conversion unit 103 and received by the light receiving unit 104.

  The detection part 102 contains the detection agent from which an absorption spectrum changes by reaction with a measuring object substance. For example, a 2% solution of neutral potassium iodide whose absorbance near a wavelength of 365 nm is changed by a reaction with ozone as a measurement target substance is included as a detection agent. When the detection agent is a solution as described above, the detection unit 102 includes an optically transparent container (spectral cell) that stores the detection agent.

  The light source 101 emits light including the wavelength of the absorption spectrum of the detection agent that changes due to the reaction with the measurement target substance. As described above, when the detection agent is composed of neutral potassium iodide, the light source 101 includes light having a wavelength of 365 nm, and is, for example, an ultraviolet lamp such as a xenon lamp or a mercury lamp.

  The wavelength conversion unit 103 converts light having the wavelength of the absorption spectrum of the detection agent (first light) out of light emitted from the light source 101 and transmitted through the detection hand unit 102 into light having a longer wavelength (second light). ). For example, the wavelength conversion unit 103 converts light having a wavelength of 430 nm or less into light in the visible range having a wavelength exceeding 430 nm. The wavelength conversion unit 103 is composed of a fluorescent film prepared by mixing a fluorescent dye (phosphor) such as DAPI (4 ′, 6-diamidino-2-phenyllinole) with a polymer such as polyethylene. Thus, the wavelength conversion element 103 should just be comprised including fluorescent substance. DAPI has a central excitation wavelength of about 360 nm and a central emission (fluorescence) wavelength of about 460 nm.

  The light receiving unit 104 receives the light converted by the wavelength conversion unit 103 and converts it into an electrical signal (photoelectric conversion signal), and includes, for example, an individual imaging device. For example, a commercially available digital still camera, digital video camera, photoelectron color meter, or the like can be used. As described above, the wavelength conversion unit 103 converts light having a wavelength in the absorption spectrum of the detection agent into light having a longer wavelength, for example, converting light having a wavelength of 430 nm or less into light having a wavelength exceeding 430 nm. Therefore, as will be described later, commercially available digital still cameras, digital video cameras, optoelectronic colorimeters, and the like can be used.

  Further, the density calculation unit 105 amplifies the photoelectric conversion signal output from the light receiving unit 104 according to a preset condition, for example, and thereby the analysis result (for example, the density value) corresponding to the amount of light received by the light receiving unit 104. Is output. The density calculation unit 105 is, for example, a computer that operates according to a program that calculates density values from input information (signals), and changes in image data as photoelectric conversion signals output from a digital video camera serving as the light receiving unit 104. Thus, the concentration value of the target substance detected by the detection unit 102 is calculated.

  Further, as shown in FIG. 2, the analysis apparatus according to the present embodiment includes a reflective detection unit 202, and light emitted from the light source 101 and reflected from the detection hand unit 202 is guided to the wavelength conversion unit 103. You may comprise as follows. Other configurations are the same as described above. In this case, for example, the detection unit 202 can be obtained by providing a reflecting mirror in a part of the detection unit 102 described above. In addition, for example, the detection unit 202 can be configured by a filter paper impregnated with a detection agent (solution) whose absorption spectrum changes due to a reaction with the measurement target substance.

[Example 1]
Next, as Example 1, an ozone analysis example using the analyzer according to the present embodiment will be described. First, a detection unit 102 in which 50 ml of a 2% neutral potassium iodide solution (detection agent) is contained in a transparent container is prepared. Ultraviolet light having a wavelength of 365 nm emitted from the light source 101 is transmitted through the detection unit 102 to detect the detection unit 102. The transmitted light that has passed through is transmitted through the wavelength conversion unit 103 and is received by the light receiving unit 104. For example, an optical image of the wavelength conversion unit 103 to which transmitted light that has passed through the detection unit 102 is incident is captured by a digital still camera as the light receiving unit 104. What is necessary is just to image | photograph the light which permeate | transmitted the detection part 102 in the state which attached the fluorescent film as the wavelength conversion part 103 to the front part of the imaging lens of a digital still camera as a lens filter.

  Since the neutral potassium iodide solution that has not reacted with ozone does not absorb near the wavelength of 365 nm, the light transmitted through the detection unit 102 includes light having a wavelength of around 365 nm. The wavelength conversion unit 103 (fluorescent film) that has received the light emits visible light (fluorescence) having a central wavelength of 460 nm when the contained DAPI is excited. As a result, an image (optical image) including blue is captured by the digital still camera.

  Next, the detection agent accommodated in the transparent container of the detection unit 102 is transferred to a container having an internal volume of 500 ml in which air containing ozone gas (analysis target gas) is collected. Next, the container in which 50 ml of the 2% neutral potassium iodide solution has been transferred is vibrated to bring the analysis target gas and the detection agent into a stirred state. Thereafter, the detection agent is taken out from the container and stored again in the transparent container of the detection unit 102.

  Next, the ultraviolet light including the wavelength 365 nm emitted from the light source 101 is transmitted through the detection unit 102 again, and the transmitted light transmitted through the detection unit 102 is transmitted through the wavelength conversion unit 103 and received by the light receiving unit 104. As described above, an optical image of the wavelength conversion unit 103 to which the transmitted light that has passed through the detection unit 102 is incident is captured by a digital still camera as the light receiving unit 104.

  This time, the detection agent (neutral potassium iodide) of the detection unit 102 is after having reacted with ozone, and has absorption near the wavelength of 365 nm. For this reason, light having a wavelength of around 365 nm is absorbed by the light transmitted through the detection unit 102. In the wavelength conversion unit 103 (fluorescent film) that receives this light, excitation of DAPI contained therein is suppressed, and emission of visible light having a center wavelength of 460 nm is reduced. As a result, in the optical image picked up by the digital still camera, the blue color is small (thin).

  The absorption in the vicinity of the wavelength of 365 nm in the detection agent described above corresponds to the concentration of ozone reacted with the detection agent, and the absorption near the wavelength of 365 nm increases as the concentration of ozone increases. In other words, the higher the ozone concentration, the smaller the light in the vicinity of the wavelength 365 nm included in the light transmitted through the detection unit 102. Therefore, the higher the ozone concentration, the smaller the amount of visible light emitted at the center wavelength of 460 nm in the fluorescent film as the wavelength conversion unit 103. As a result, in the optical image captured by the digital still camera, the blue concentration is higher. descend. For example, when the ozone concentration is high and the light transmitted through the detection unit 102 does not include any light having a wavelength of about 365 nm, the digital still camera captures a colorless and transparent fluorescent film. In the optical image, there is no blue component.

  In the computer as the concentration calculation unit 105, the concentration of the reacted ozone is calculated by comparing the image data before and after the reaction (measurement) with the ozone by the processing of the operating program. For example, the density calculation unit 105 uses a relational expression between the luminance value of the blue component and the ozone concentration in the image data prepared in advance, thereby obtaining the luminance value of the blue component obtained from the difference between the two image data before and after the measurement. From this, the ozone concentration is calculated.

  Also, if a relational expression between either the blue component / red component ratio or the blue component / green component ratio and the ozone concentration in the image data is prepared, it can be obtained from the difference between the two image data before and after the measurement. The ozone concentration can be calculated from the change in the component ratio. In general, the wavelength configuration of the light source 101 is kept constant even if the light intensity changes, and according to the latter method, it is difficult to be affected by the change in the light intensity of the light source 101.

  Here, a commercially available digital still camera and digital video camera (digital camera) can be regarded as a device (measuring instrument) for detecting tristimulus values, like a photoelectric colorimeter. In general, the spectral response is adjusted so as to be close to an equation function according to the so-called CIEXYZ color system (JIS Z8701). For example, a blue filter part constituting a color filter (primary color filter) of a digital still camera is designed to be close to an equation function z (wavelength) (see Non-Patent Document 13). For this reason, in a commercially available digital still camera, for example, light having a wavelength of 450 to 460 nm can be detected with sufficient sensitivity.

  Incidentally, in the above description, the analysis of ozone using neutral potassium iodide as a detection agent has been described as an example, but the present invention is not limited to this. For example, the present invention can be applied to analysis of formaldehyde using a detection agent containing β-diketone such as acetyl ketone and ammonium ion. Hereinafter, an example of analysis of formaldehyde using the analyzer according to the present embodiment will be described.

[Example 2]
Next, as Example 2, an analysis example of formaldehyde using the analyzer according to the present embodiment will be described. In the second embodiment, a case of simple analysis (measurement) by visually observing the wavelength conversion unit 103 without using the light receiving unit 104 and the concentration calculation unit 105 will be described.

  First, a detection agent (50 ml) in which ammonium acetate, acetylacetone, and acetic acid are dissolved is prepared, and this detection agent is impregnated into porous glass (Corning Vycor 7930) to form the detection unit 102 (see Non-Patent Document 5). ). It should be noted that the light transmission characteristics of the detection unit 102 configured as described above change as shown by the dotted line from the solid line in FIG. 3 due to the reaction with formaldehyde. As can be seen from FIG. 3, when the detection unit 102 in Example 2 is exposed to formaldehyde, the light absorption characteristic at a wavelength of about 410 nm changes. Further, not limited to acetylacetone, it may be a β-diketone such as 1-phenyl-1,3-butanedione, 1,3-diphenyl-1,3-propadione.

  Therefore, in the second embodiment, for example, a halogen lamp or an incandescent lamp is used as a light source including a wavelength of 410 nm. In Example 2, for example, the wavelength conversion unit 103 is configured by a fluorescent film prepared by mixing with a polymer such as a fluorescent dye “Pacific Blue” polyethylene manufactured by Beckman Coulter. “Pacific Blue” has a central excitation wavelength of about 410 nm and a central emission (fluorescence) wavelength of about 455 nm.

  Next, light source light including a wavelength of 410 nm emitted from the light source 101 is transmitted through the detection unit 102, and transmitted light transmitted through the detection unit 102 is incident on the wavelength conversion unit 103. Since the detection agent in Example 2 that does not react with formaldehyde has no absorption in the vicinity of a wavelength of 410 nm, the light transmitted through the detection unit 102 includes light in the vicinity of a wavelength of 410 nm. The wavelength conversion unit 103 (fluorescent film) that receives this light emits visible light (fluorescence) having a central wavelength of 455 nm when the contained “Pacific Blue” is excited. As a result, when the wavelength conversion unit 103 is visually observed, blue is recognized.

  Next, the detection unit 102 is exposed to air containing formaldehyde gas (analysis target gas) so that the detection agent contained in the detection unit 102 can react with formaldehyde.

  Next, again, ultraviolet light including a wavelength of 410 nm emitted from the light source 101 is transmitted through the detection unit 102, and transmitted light transmitted through the detection unit 102 is incident on the wavelength conversion unit 103. As described above, the wavelength conversion unit 103 in this state is visually observed. This time, the detection agent of the detection unit 102 is after reacting with formaldehyde, and has an absorption near a wavelength of 410 nm. For this reason, light having a wavelength of around 410 nm is absorbed by the light transmitted through the detection unit 102. In the wavelength conversion unit 103 (fluorescent film) that receives this light, excitation of “Pacific Blue” included is suppressed, and emission of visible light having a central wavelength of 455 nm is reduced. As a result, when the wavelength conversion unit 103 is visually observed, it is recognized that the blue color has changed lightly.

  The absorption in the vicinity of the wavelength of 410 nm in the detection agent described above corresponds to the concentration of formaldehyde reacted with the detection agent, and the absorption in the vicinity of the wavelength 410 increases as the concentration of formaldehyde increases. In other words, the higher the formaldehyde concentration, the less light near the wavelength 410 contained in the light transmitted through the detection unit 102. Therefore, the higher the formaldehyde concentration, the smaller the amount of visible light emitted at the central wavelength of 460 nm in the fluorescent film as the wavelength conversion unit 103, and as a result, the blue color is recognized lighter in visual observation. When the formaldehyde concentration is high and the light transmitted through the detection unit 102 does not contain any light having a wavelength of about 410 nm, a colorless and transparent fluorescent film without blue is recognized by visual observation. Become. In addition, the light which permeate | transmits the wavelength conversion part 103 is not colorless.

  Here, if a color chart corresponding to the relationship between the change in the color of the fluorescent film as the wavelength conversion unit 103 and the change in the formaldehyde concentration is prepared, the reaction can be obtained by comparing with the color chart by visual observation. The concentration of formaldehyde can be determined. According to the second embodiment, the change in the light having a wavelength of 410 nm in the detection unit 102 is converted into the change in the light having a wavelength of 455 nm, so that visual observation is possible. The human visibility is about 8.75 times 1 for light with a wavelength of 455 nm compared to light with a wavelength of 410 nm. “Pacific Blue” converts about 80% of the absorbed light having a wavelength of 410 nm into light having a wavelength of 455 nm. Therefore, according to the second embodiment, the sensitivity can be increased by about 7 times at the maximum.

  In the case of the above-described first embodiment (ozone analysis), the ozone concentration can be simply measured by visual observation of the wavelength conversion unit 103 as in the second embodiment. However, in the ozone analysis of Example 1, since the wavelength used in the light source 101 is mainly in the ultraviolet region, an observer who observes visually wears glasses (goggles) that remove (suppress) ultraviolet rays, etc. Observation should be performed while suppressing the penetration of ultraviolet rays.

  In the first and second embodiments, the case where the transmission type detection unit 102 is used has been described. However, the same applies to the case of the reflection type detection unit 202. For example, the measurement using the detection unit 202 composed of a filter paper impregnated with a detection agent made of a 2% neutral potassium iodide solution and the detection agent after reacting with ozone in a 2% neutral potassium iodide solution By the measurement using the detection unit 202 made of impregnated filter paper, ozone can be analyzed in the same manner as in Example 1 described above.

  In the above description, the case of analyzing gas such as ozone gas and formaldehyde gas has been described. However, the present invention is not limited to this. For example, the present invention is also applicable to analysis of ozone dissolved in an aqueous solution or formaldehyde dissolved in a solution. It goes without saying that it is possible. For example, in Example 1, by mixing an aqueous solution to be analyzed with the detection agent, it is possible to analyze ozone dissolved in the aqueous solution to be analyzed.

  Examples of the phosphor include transition metal phosphors, rare earth phosphors, aromatic compounds, tungstates, and the like, in addition to the above-described fluorescent dyes such as DAPI and “Pacific Blue”, such as naphthalene and anthracene. In addition, various fluorescent materials such as magnesium tungstate, zinc sulfide, and yttrium compound can be appropriately selected. Further, the wavelength conversion unit 103 may be used by forming a layer in which a phosphor is mixed on the surface of a transparent member such as quartz glass, or by applying a phosphor on the surface of the transparent member. May be.

  As described above, in the present invention, the wavelength conversion means transmits or reflects the detection means, for example, converting the first light having a wavelength of 430 nm or less to the second light having a wavelength exceeding 430 nm. The first light having the wavelength of the absorption spectrum in the obtained light is converted to the second light having a longer wavelength. As a result, according to the present invention, since the changing wavelength is visible light having a wavelength in the ultraviolet region or near the ultraviolet region, it is a detection agent that requires an expensive spectrophotometer or the like for colorimetric analysis. However, since this change in light is converted into a longer wavelength, it is possible to perform a colorimetric analysis that is cheaper and simpler. For example, visual measurement is possible. In addition, colorimetric analysis using a commercially available digital camera is possible as a cheaper and simpler apparatus. In addition, it is possible to use a digital camera built in a so-called mobile phone, and the state of the wavelength conversion unit 103 is imaged by the digital camera built in the mobile phone, and this data is transferred to a server using the network of the mobile phone. Services such as processing and notifying the mobile phone of the analysis results are also possible.

  According to the present invention described above, even if it is a colorimetric detection agent whose absorbance changes at a wavelength of 430 nm or less, which is not easy and impossible to visually recognize, an expensive spectrophotometer or a specific wavelength Analysis can be performed by using inexpensive devices such as consumer devices such as digital cameras and photoelectric colorimeters and visual observation without using devices using LEDs. As described above, according to the present invention, it is possible to perform a colorimetric analysis of an analysis target substance using more types of detection agents by a simple and inexpensive apparatus or visual inspection that uses an absorption spectrum change in the visible range as a detection target. become.

It is a block diagram which shows the structure of the analyzer in embodiment of this invention. It is a block diagram which shows the other structure of the analyzer in embodiment of this invention. It is a characteristic view which shows the light transmission characteristic of the detection part 102 in embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 ... Light source, 102, 202 ... Detection part, 103 ... Wavelength conversion part, 104 ... Light-receiving part, 105 ... Concentration calculation part.

Claims (6)

A detection means including a detection agent whose absorption spectrum changes by reaction with the substance to be measured;
A light source containing light of the wavelength of the absorption spectrum in the emitted light;
Wavelength conversion means for converting first light having the wavelength of the absorption spectrum into light emitted from the light source and transmitted or reflected by the detection means to second light having a longer wavelength. Analyzing device. The analyzer according to claim 1,
The wavelength converting means converts the first light having a wavelength of 430 nm or less into the second light having a visible wavelength exceeding 430 nm. The analyzer according to claim 2, wherein
The wavelength converting means includes a phosphor, and the analyzer is characterized in that: The analyzer according to any one of claims 1 to 3,
An analyzer comprising light receiving means for receiving the second light converted by the wavelength converting means and converting it into an electrical signal. In the analyzer of any one of Claims 1-4,
The detection device contains neutral potassium iodide. In the analyzer of any one of Claims 1-4,
The analyzer is characterized in that the detection agent contains β-diketone.

Images