JPS6135508B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spectral detection mechanism configured to perform spectral analysis for each item without mechanical operation in a multi-item spectroscopic analysis device using an optical system. .

As is well known, the color test paper method is often used as a test method for analyzing liquid samples and the like, for example, measuring test components and concentrations in urine in clinical tests. This color test paper reacts with the component to be tested and shows the degree of coloration depending on the component and concentration of the urine to be tested, and the concentration is generally determined by comparing this degree of coloration with a reference color sample. It is something to do. The method of determining and measuring the components and concentration of urine to be tested using this colored test paper is to irradiate the test paper with light, guide the reflected light to a spectrometer, and use the output wavelength to identify the sample. A device that reads the coloring characteristics of is known. Conventionally, this type of device mechanically moves a test strip stand with multiple test items relative to a single light source, one test strip at a time, and converts the reflected light from the test strips into a spectrometer. It is configured as a device designed to be introduced. This conventional device has a configuration in which the test items on the test strip are mechanically moved to match one irradiation point of a single light source, and the wavelength of the reflected light separated by a prism, diffraction grating, etc. Due to the configuration of movable parts for operating slits, etc. for selection and measurement, mechanical failure is likely to occur, and single
This method has drawbacks such as requiring a fairly complicated mechanism in order to accurately position the test strip with respect to the light source.

An object of the present invention is to provide a spectroscopic analysis device configured without mechanically moving test strips having a plurality of test items.

In achieving the above-mentioned object, the present invention specifically irradiates light from a light source onto a test paper piece of color test paper, guides the reflected light to a spectrometer,
In a spectroscopic analyzer that reads the color properties of a sample using the spectral wavelength, a plurality of static analyzers are arranged to individually irradiate a group of test paper strips having a plurality of test items. It comprises a light source and a plurality of light receiving sections arranged to individually receive the reflected light from each of the stationary light sources, and guides the light received by the light receiving sections so as to focus it on the optical axis of the spectrometer. a photodiode array formed by a plurality of light receiving element groups that receive the spectral light from the spectroscope and output electrical signals corresponding to the amount of light received at each wavelength commensurate with the coloring characteristics. This is a multi-item spectrometer consisting of: As mentioned above, the device of the present invention prepares a plurality of stationary light sources corresponding to the test items without moving the test strip, and sequentially blinks the stationary light sources, thereby sequentially checking the test items on the test strip. irradiation and each reflected light is introduced into a spectrometer individually, and the light intensity of the wavelength determined in advance for each test item is determined by selecting the light receiving element of the photodiode array. This is a device that photoelectrically reads the coloring characteristics of a test piece by measuring it as a current value.

EMBODIMENT OF THE INVENTION Hereinafter, the multi-item spectroscopic analysis apparatus according to the present invention will be described in detail based on specific embodiments shown in the drawings.

The test paper 1 is configured in advance with n test items (2a) to (2n) depending on the purpose of the test. The test strip 1 is set stationary at a test strip setting position. On the other hand, the stationary light source 3 includes n+1 lamps (3a) to (3n) corresponding to each test item (2a) to (2n) of the test paper 1 and the reference area 4.
Among the stationary light sources, the lamps (3a) to (3n) meet each of the inspection items (2a) to
(2n) are placed in such a position that they can be irradiated individually. Furthermore, one lamp (3n+1) among the stationary light sources is assembled as a reference lamp for checking the luminous intensity-current sensitivity at the wavelength of each light-receiving element of the photodiode array, which will be described later. is arranged adjacent to the test strip setting position corresponding to the reference lamp (3n+1). Each of the stationary light sources 3 is turned on individually.
The circuit is configured so that it can be turned off.
On the other hand, the light guiding means 5 includes n+1 light receiving sections (6a) to (6n+1) arranged at positions suitable for individually receiving the reflected light from each of the stationary light sources 3.
It is equipped with Further, the light guiding means 5 is configured to guide the light received by the light receiving sections (6a) to (6n+1) to a light condensing section 7 that coincides with the optical axis L of the spectrometer. A specific example of the light guiding means 5 is constituted by n+1 optical fiber elements corresponding to the stationary light source. In this case, one end of each of the plurality of optical fiber elements is installed at the light receiving part arrangement position to form n+1 light receiving parts 6, and the other ends are bundled at a point that coincides with the optical axis L of the spectrometer to form a light condensing part. 7. As another example of this light guiding means, it may be a light receiving and reflecting mirror arranged at the light receiving part arrangement position, which is assembled so as to reflect the received light beam toward the optical axis of the spectrometer. . The light beam from the condensing end setting position of the light guiding means 5 is introduced along the optical axis of the lens 8, the slit 9, and the spectroscope, such as the prism 10. The spectrometer 10
For example, a diffraction grating other than a prism may be used. Meanwhile, a photodiode array 12 is installed downstream of the spectrometer 10.
The photodiode array 12 is constituted by an aggregate of a plurality of light receiving elements 11. The number of light-receiving elements and the physical arrangement distance of the photodiode array 12 are determined to be sufficient to obtain a resolution that satisfies test accuracy, and are matched to the refraction spectral characteristics of the spectrometer. Each refracted light beam from the spectroscope 10 has a luminous intensity at a wavelength determined in advance for each test item.
The coloring characteristics of the test paper piece are read by selecting the light receiving element 11 in 2 and measuring its current value. The output signal 13 of the photodiode array 12 is sent to the arithmetic circuit 1 via a multiplexer 14.
5 will be introduced. The arithmetic circuit 15 calculates the reflected light signal of the test paper strip 2 and the reference light source by the reference light source.
The reflectance of the test paper piece 2, that is, the coloring characteristics are calculated by comparing the quasi-reflectance signal with the quasi-reflectance signal. The calculated electrical signal is displayed on the output display section 16 as a color rank of the corresponding test paper piece.

According to the present invention, first, the test strip 1 is set stationary at a predetermined position, and the stationary light sources arranged corresponding to the number of test items on the test strip are sequentially blinked, and the test item pieces of the test strip are Irradiate each strip of test paper. The reflected light irradiated for each test item is received by a light guiding means having a plurality of light receiving sections arranged corresponding to each test item, and is sequentially introduced into a spectrometer, and then is sent to a photodiode according to its wavelength characteristics. The light receiving elements in the array are irradiated to output an electric signal 13 from the photodiode array. In this case, the reflected light input to the photodiode array is only from the lit light source lamp and is not affected by other items.

According to the spectroscopic analyzer of the present invention having the above configuration, first, the test paper is moved;
Since there is no mechanical configuration to operate a slit etc. to select and measure the wavelength of the spectrally reflected light, mechanical failure of the device can be prevented, and the number of each test item on the test strip and the position of the light source can be set. can be carried out reliably, and furthermore, it has the advantage that a two-wavelength measurement method can be easily carried out.

[Brief explanation of the drawing]

The drawing is a schematic principle diagram showing a specific embodiment of the multi-item spectroscopy apparatus according to the present invention. 1...Test paper piece base material, 2...Test paper piece, 3...
Stationary light source, 4... Reference area, 5... Light guide means,
6... Light receiving section, 7... Light collecting section, 8... Lens, 9
...Slit, 10...Spectroscope, 11...Photodetector, 12...Photodiode array, 13...
Output signal, 14...Multiplexer, 15... Arithmetic circuit, 16... Output display section. 〓〓〓〓〓

Claims (1)

[Scope of Claims] 1. A spectroscopic method in which light from a light source is irradiated onto a piece of color test paper, the reflected light is guided to a spectrometer, and the color characteristics of the sample are read based on the spectral wavelength. In the analyzer, for a group of test strips having multiple test items,
A plurality of stationary light sources arranged so as to individually irradiate the test paper strips, and a plurality of light receiving sections arranged so as to individually receive the reflected light from each of the stationary light sources, and the light receiving section a light guiding means that guides the received light so as to focus it on the optical axis of the spectroscope; and a plurality of light receivers arranged at physical distances suitable for receiving the spectral rays from the spectroscope and selecting the wavelength of each spectral ray. 1. A multi-item spectroscopic analysis device comprising: a photodiode array having elements arranged thereon; and the photodiode array is used to convert spectrophotometric intensity of a selected wavelength into an electrical signal. 2. In addition to the stationary light source, a reference stationary light source is provided that illuminates a reference area adjacent to the test strip, and the photodiode array is checked for its respective phototo-current conversion sensitivity at each wavelength using the reference stationary light source. A multi-item spectroscopic analysis device according to claim 1, characterized in that: