JP2014240786A - Component concentration analyzer using light-emitting diode, and measuring apparatus using light-emitting diode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a component concentration analyzer using a light-emitting diode that can obtain accurate analytical data without being influenced by changes in emission intensity and in peak wavelength.SOLUTION: The component concentration analyzer using a light-emitting diode includes: a storage unit 17 that stores, for each measurement by light emission of a plurality of light-emitting diodes 11, an intensity of first scattered light detected by a first detection unit 16a, an intensity of second scattered light detected by a second detection unit 16b, and a working temperature of the light-emitting diodes 11 detected by an LED temperature detection unit 13; and a component concentration calculation unit 36 that when relative reflectance is calculated from the intensity of the first scattered light and the intensity of the second scattered light, corrects a peak wavelength from a prestored peak wavelength of the light-emitting diodes 11, working temperature data of the light-emitting diodes 11 measured by the LED temperature detection unit 13, and relational data between the working temperature data and the peak wavelength, and that calculates component concentration using an absorption wavelength based on the corrected peak wavelength.

Description

  The present invention relates to a component concentration analyzer using a light emitting diode capable of analyzing the sugar concentration and acidity concentration of fruits, for example.

For example, devices disclosed in Patent Document 1 to Patent Document 4 have been proposed as component concentration analyzers for fruits.
Patent Document 1 irradiates fruits with near-infrared rays that are dispersed in a short wavelength region having a relatively strong transmission power, obtains absorbance from the amount of transmitted light, and calculates a value obtained by correcting the absorbance according to the size of the fruit. A fruit component nondestructive measuring device for obtaining an index related to sweetness has been proposed (for example, paragraph number (0015)).
In Patent Document 1, a problem with a laser diode (LD) is that the current flowing for a certain voltage or the current flowing for a certain output may change due to a change in the temperature of the usage environment. It has been proposed that the element of the LD may be destroyed if the operating current flows excessively, so that it is proposed not to oscillate the LD under an abnormal temperature. In addition, an error occurs due to the difference in temperature of the measurement part of the fruit to be measured, so that the accuracy of the calibration curve can be improved by detecting the ambient temperature of the LD (paragraph number (0040)).

Patent Document 2 discloses a method and apparatus for measuring the sugar content of fruits and vegetables using light having wavelengths in the near-infrared region. In addition to thin fruits and vegetables such as peaches and apples, sugar concentrations in fruits and vegetables such as mandarin oranges and melons are not high. Proposed non-destructive sugar content measurement method and apparatus for fruits and vegetables that can be measured by destruction and do not require a complex spectroscope composed of a diffraction grating or the like as in the conventional sugar content measurement apparatus (paragraph number (0017)). .
Patent Document 2 includes a measuring device capable of measuring the light transmittances Ta and Tb of each monochromatic light by irradiating the fruits and vegetables with two monochromatic lights having different wavelengths, and values of the light transmittances Ta and Tb of a plurality of actual measurement examples. And a formula for determining the coefficients k0 and k1 from the measured sugar content C value of the example, and using the determined coefficients k0 and k1 and data of the light transmittances Ta and Tb of two monochromatic lights to be measured. To determine the sugar content.

In Patent Document 3, an irradiation unit that irradiates light having a plurality of different wavelengths to a measurement site of fruits and vegetables is received, and light transmitted through the measurement site of fruits and vegetables is received at two locations at different distances. Then, a transmitted light amount detecting means for detecting the transmitted light amount is provided, and a relative transmittance, which is a ratio of transmitted light amounts of wavelengths at two locations detected by the transmitted light amount detecting means, is calculated for each wavelength, and the relative transmission of each wavelength is calculated. A non-destructive sugar content measuring apparatus for fruits and vegetables has been proposed (paragraph number (0026)) provided with a calculation means for calculating the sugar content of fruits and vegetables using the degree (paragraph number (0026)).
In Patent Document 3, two or more different monochromatic lights are irradiated to the fruits and vegetables by the irradiation means, and the transmitted light that is scattered and absorbed inside the fruits and radiated to the outside is placed at two different distances from the irradiation position of the monochromatic light. It is detected by. And the relative transmittance which is the ratio is calculated from the two transmitted light detected, and the sugar content of the fruits and vegetables is calculated using this relative transmittance. The detected transmitted light includes the sugar content information of the fruits inside the fruits and vegetables, and the sugar content of thick fruits and vegetables such as mandarin oranges and melons can be measured (paragraph number (0027)).

Patent Document 4 proposes a non-destructive measurement device for a light scatterer that can obtain good measurement accuracy even when a light scatterer with a spatially non-uniform distribution of scattering coefficients is used as an object (paragraph number). (0004)).
In Patent Document 4, transmitted light of light emitted from a light irradiation unit to one irradiation region of a subject is received by at least two light receiving units, and the light intensity of each light receiving unit is measured by a transmitted light detection unit. To detect. Then, the relative transmittance, which is the ratio of the light intensities of two light receiving parts with different concentric diameters, is calculated for each wavelength from the light intensity of each light receiving part, and the property characteristic value inside the subject is calculated based on them. (Paragraph number (0005)).

As component concentration analyzers other than fruits, for example, devices shown in Patent Literature 5 to Patent Literature 8 have been proposed.
Patent Document 5 proposes a small and easy-to-carry blood glucose level non-invasive measurement device that can measure blood glucose level of a human body non-invasively without error (paragraph number (0011)).
In Patent Document 5, a plurality of monochromatic lights having different wavelengths are generated from a light source, and the monochromatic light is irradiated onto a measurement site (for example, a finger) of a human body by an irradiation unit. The irradiated monochromatic light is scattered and absorbed inside the human body, and is emitted outside the human body to become transmitted light. This transmitted light is detected by the transmitted light amount detection means at a fixed linear distance that is different from the irradiation position of the monochromatic light. The relative transmittance, which is the ratio of the detected two transmitted lights, is calculated for each wavelength, and the blood glucose level of the human body is calculated from the relative transmittance. The detected transmitted light includes blood glucose level information inside the human body, and the blood glucose level of the human body can be measured non-invasively (paragraph number (0013)).

Patent Document 6 proposes a small measuring apparatus that can easily measure the moisture content of a measuring member with high accuracy (paragraph number (0005)).
In Patent Document 6, two types of monochromatic light having different wavelengths are irradiated on the surface of the measurement member, the reflected light from the surface of the measurement member is guided to the light amount measurement unit, the amount of reflected light is measured, and the reflected absorbance (Aλ) at each wavelength is measured. ) To calculate the difference in reflection absorbance between two wavelengths (ΔAλ) or the ratio of reflection absorbance between two wavelengths (Aλ ′) between the reflection absorbance at a certain wavelength and the reflection absorbance at a wavelength of 1350 nm or less. The moisture content of the measurement member is calculated from the relationship between the reflected absorbance difference or reflected absorbance ratio and the moisture content (paragraph number (0009)).

Patent Document 7 proposes a substance internal information measuring device using light scattering, which can reproduce internal information of a substance satisfactorily regardless of differences in measurement sites and measurement conditions of a living body (the invention is solved). Column of assignment to be attempted).
In Patent Document 7, light is sequentially irradiated at a plurality of irradiation points that are arranged in substantially the same direction as viewed from the light receiving point on the surface of the substance and have substantially different light diffusion optical path lengths from the light receiving point. The irradiation light is received, a predetermined calculation is performed based on the difference in the received light data corresponding to the angle irradiation, and the internal information of the substance is measured (column of means for solving the problem).

Patent Document 8 proposes a non-destructive measurement device for a light scatterer that is suitable as a non-invasive measurement device for a biological composition that uses a living body that is a light scatterer as a subject and measures the composition of the subject from its property measurement values. (Paragraph number (0001)).
In Patent Document 8, at least two light-receiving units receive transmitted light of light irradiated to one irradiation region of a subject from a light irradiation unit, and the light detection unit detects the light intensity of each light-receiving unit. Then, the relative reflectance that is the ratio of the light intensities of two light receiving parts having different concentric circle diameters is calculated for each wavelength from the light intensity of each light receiving part by the arithmetic processing part, and the properties inside the subject are calculated based on them. The characteristic value is calculated (paragraph number (0006)).

On the other hand, in light emitting diodes (LEDs), it is known that the wavelength varies due to non-uniformity in the manufacturing process, and the wavelength changes due to a temperature change of the LED module.
Patent Document 9 proposes a light generating device using an LED that can precisely create and maintain a desired peak wavelength of the LED (paragraph number (0009)).
Further, Patent Document 9 proposes a light generation device that corrects the LED wavelength when the LED module changes in accordance with the temperature change of the LED module and maintains a constant wavelength (paragraph number (0010)). .
In Patent Document 9, the arithmetic processing unit refers to the temperature detected by the temperature sensing unit, calculates a correction current value of the LED currently emitting light, and uses this correction current value as the drive current of the LED currently emitting light. The corrected drive current value is determined by adding the value. This correction current value is calculated by an experimental value or a calculation formula using the detected temperature and the LED drive current value input to the memory (paragraph number (0037)).

Patent Document 10 has a problem that even if the LEDs have the same specifications, there is a difference in temperature characteristics between individuals, and thus the same temperature characteristics are not necessarily exhibited, and a measured value of fluorescence intensity emitted from a specimen is used as a light source. Has proposed an apparatus that can correct the emission intensity of the light emission intensity by removing the influence of the temperature characteristic (paragraph numbers (0007) and (0008)).
In Patent Document 10, a reference light source that emits reference excitation light is used in addition to a measurement light source that emits excitation light for measurement in order to examine a change in emission intensity of the light source due to a temperature change, and excitation from these light sources is performed. A reference substance is used to measure the intensity of fluorescence when irradiated with light (paragraph number (0009)).

Patent Document 11 proposes a light quantity control device that acquires a coefficient for correcting the influence of the light quantity of the LED element over time in consideration of the influence of the ambient temperature of the LED element (paragraph number (0010)).
In Patent Document 11, an energization unit that applies current to an LED element, a light amount detection unit that detects a light amount of the LED element, a temperature detection unit that detects an ambient temperature of the LED element, and a light amount of the LED element becomes a target light amount value. The first current amount set in advance as described above and the first light amount so that the light amount of the LED element becomes the target light amount value at a temperature different from the ambient temperature of the LED element when the first current amount is set. Storage means for storing a temperature correction coefficient for correcting the current amount of the LED element, and when the light quantity of the LED element detected by the light quantity detection means reaches the target light quantity value, it is given to the LED element by the energization means. The LED element when the first current amount is set from the second current amount and the temperature correction coefficient at the ambient temperature of the LED element when the second current amount is applied to the LED element. No lap At a temperature, it calculates the aging correction factor for correcting the influence of the light intensity due to aging of the LED elements (paragraph numbers (0011)).

JP 2002-116141 A JP 2003-114191 A JP 2004-317381 A JP 2007-271575 A JP 2004-31554 A JP 2000-146834 A Japanese Patent Laid-Open No. 02-163634 JP 2009-085712 A JP 2012-059706 A JP 2012-013450 A JP 2012-238721 A

The use of a plurality of wavelengths as a component concentration analyzer is conventionally known as disclosed in Patent Document 1 to Patent Document 8, and further, the use of an LED as a light source is also disclosed in Patent Document. 1 is disclosed.
However, as disclosed in Patent Document 9 to Patent Document 11, when an LED is used as the light source, the emission intensity and the peak wavelength change depending on the operating temperature of the LED. Further, as disclosed in Patent Document 10, there is a difference in temperature characteristics between individuals even if the LEDs have the same specifications.
Therefore, it is important to consider changes in emission intensity and peak wavelength in order to analyze substance components such as component concentrations for fruits and blood sugar levels of the human body using LEDs.
It is also necessary to consider the difference in temperature characteristics between the individual LEDs.
However, Patent Document 1 to Patent Document 8 do not disclose sufficient means for solving the problem in the case of using an LED as a light source.
By the way, the method of correcting the current value proposed in Patent Document 9 is effective for an LED that emits light continuously, but cannot be applied to a component concentration analyzer that obtains scattered light by irradiation for a very short time.
In addition to the measurement light source proposed in Patent Document 10, a reference light source that emits reference excitation light is used, and a reference substance is used to measure the intensity of fluorescence when the excitation light from these light sources is irradiated. The method to be used is difficult to apply in a component concentration analyzer that obtains scattered light by irradiation for a very short time, and the apparatus becomes complicated.
Also, the method proposed in Patent Document 11 cannot be applied to a component concentration analyzer that obtains scattered light by irradiation for an extremely short time.

  Therefore, an object of the present invention is to provide a component concentration analysis apparatus using a light emitting diode that can obtain accurate analysis data without undergoing changes in emission intensity and peak wavelength.

The component concentration analyzer using the light-emitting diode according to the first aspect of the present invention includes a plurality of light-emitting diodes having different wavelengths, a light source control unit that sequentially emits the plurality of light-emitting diodes, an incident unit, and a light-receiving unit. A probe that is in close contact with the surface of an object, an incident optical path that guides incident light from the light emitting diode to the incident part, a detection optical path that guides scattered light received by the light receiving part to the detection part, and an operating temperature of the light emitting diode. An LED temperature detection unit to measure, and the light receiving unit includes a first light receiving unit and a second light receiving unit that have different distances from the incident unit, and the detection light path includes a first light receiving unit, The first detection light path for guiding the first scattered light received by the light receiving unit to the first detection unit, and the second detection of the second scattered light received by the second light receiving unit. 2nd leading to the department A component concentration analyzer using a light emitting diode having a detection light path, the intensity of the first scattered light detected by the first detection unit measured for each light emission of the plurality of light emitting diodes, a second A storage unit for storing the intensity of the second scattered light detected by the detection unit and the operating temperature of the light emitting diode detected by the LED temperature detection unit; and the intensity and the first of the first scattered light. In calculating the relative reflectance from the intensity of the scattered light of 2, the peak wavelength stored in advance for the light emitting diode, the operating temperature data of the light emitting diode measured by the LED temperature detection unit, The peak wavelength is corrected from the operating temperature data and the relationship data of the peak wavelength, and the component concentration is calculated using the absorption wavelength based on the corrected peak wavelength. And having a that component concentration calculation unit.
According to a second aspect of the present invention, there is provided the component concentration analyzer using the light emitting diode according to the first aspect, further comprising an object temperature detection unit that measures a surface temperature of the measurement object. The surface temperature detected by the object temperature detector is stored, and the temperature correction of the component concentration calculated by the component concentration calculator is performed based on the surface temperature.
According to a third aspect of the present invention, in the component concentration analyzer using the light emitting diode according to the first or second aspect, a light emission time change for changing a light emission time of the light emitting diode with a change of the measurement object And the light source control unit causes the light emitting diode to emit light for the light emission time changed by the light emission time changing means.
According to a fourth aspect of the present invention, in the component concentration analyzer using the light-emitting diode according to any one of the first to third aspects, the component concentration calculation unit according to the measurement target component to be measured. And changing the combination of the light emitting diodes to be calculated.
A fifth aspect of the present invention is a component concentration analyzer using the light emitting diode according to any one of the first to fourth aspects, comprising a measuring instrument and an analyzer, wherein the measuring instrument includes the light emission. A diode, the light source control unit, the probe, the incident optical path, the detection optical path, and the LED temperature detection unit, the analyzer includes the component concentration calculation unit, and is measured by the measuring instrument, The intensity of the first scattered light, the intensity of the second scattered light, and the use temperature data are transmitted from the transmission unit to the reception unit of the analyzer.
According to a sixth aspect of the present invention, in the component concentration analyzer using the light emitting diode according to any one of the first to fifth aspects, for each of the light emitting diodes, a peak wavelength based on an individual difference of the light emitting diodes The difference is measured in advance, and the peak wavelength measured in advance is used in the calculation of the relative reflectance.
The measuring instrument using the light emitting diode of the present invention according to claim 7 includes a plurality of light emitting diodes having different wavelengths, a light source control unit that sequentially emits the plurality of light emitting diodes, and an incident unit and a light receiving unit of the object to be measured. A probe to be brought into close contact with the surface, an incident optical path for guiding incident light from the light emitting diode to the incident part, a detection optical path for guiding scattered light received by the light receiving part to the detection part, and a use temperature of the light emitting diode are measured. An LED temperature detection unit, and the light receiving unit includes a first light receiving unit and a second light receiving unit with different distances from the incident unit, and the first light receiving unit is used as the detection light path. The first detection light path that guides the first scattered light received by the first part to the first detection part, and the second scattered light received by the second light reception part to the second detection part Second detection optical path to be guided A measuring device using a light emitting diode having the first scattered light intensity detected by the first detection unit and measured by the second detection unit, measured for each light emission of the plurality of light emitting diodes A transmitter that transmits the intensity of the second scattered light and the use temperature data of the light-emitting diode detected by the LED temperature detector together with identification data and measurement time data for identifying the measuring device. It is characterized by.

  According to the component concentration analyzer using the light emitting diode of the present invention, the relative reflectance is used to eliminate the influence of the change in the emission intensity due to the use temperature of the light emitting diode and the secular change, and the correction absorption coefficient is used. Since the influence of the change of the peak wavelength due to the temperature can be eliminated, and furthermore, the influence of the temperature of the measurement object can be eliminated by the temperature correction, the accurate component concentration can be measured using the light emitting diode.

1 is a configuration diagram of a component concentration analyzer using a light emitting diode according to an embodiment of the present invention.

  The component concentration analyzer using the light emitting diode according to the first embodiment of the present invention measures the intensity of the first scattered light detected by the first detection unit, measured for each light emission of the plurality of light emitting diodes, and second. A storage unit for storing the intensity of the second scattered light detected by the detection unit and the use temperature of the light emitting diode detected by the LED temperature detection unit, and the intensity of the first scattered light and the intensity of the second scattered light. In calculating the relative reflectance from the above, the peak wavelength stored in advance for the light emitting diode, the use temperature data of the light emitting diode measured by the LED temperature detection unit, the use temperature data, and the peak wavelength, And a component concentration calculation unit that calculates the component concentration using the absorption wavelength based on the corrected peak wavelength. According to the present embodiment, the relative reflectance is used to eliminate the influence of the change in emission intensity due to the use temperature of the light emitting diode and the secular change, and the influence of the change in peak wavelength due to the use temperature by using the corrected absorption coefficient. Can be eliminated.

  The second embodiment of the present invention includes an object temperature detection unit that measures the surface temperature of the measurement object in the component concentration analyzer using the light emitting diode according to the first embodiment. The surface temperature detected by the object temperature detection unit is stored, and the temperature correction of the component concentration calculated by the component concentration calculation unit is performed based on the surface temperature. According to the present embodiment, the temperature correction can eliminate the influence of the temperature of the measurement object, so that the accurate component concentration can be measured using the light emitting diode.

  In the third embodiment of the present invention, in the component concentration analyzer using the light emitting diode according to the first or second embodiment, the light emission time change for changing the light emission time of the light emitting diode with the change of the measurement object The light source control unit causes the light emitting diode to emit light with the light emission time changed by the light emission time changing means. According to this embodiment, the intensity of incident light suitable for a measurement object can be obtained, and an accurate component concentration can be measured.

  According to a fourth embodiment of the present invention, in a component concentration analysis apparatus using the light emitting diode according to any one of the first to third embodiments, a component concentration calculation unit according to a measurement target component to be measured. The combination of light emitting diodes to be calculated is changed. According to the present embodiment, an accurate component concentration can be measured by using an optimum combination of wavelengths according to a measurement target component to be measured.

  The fifth embodiment of the present invention includes a measuring instrument and an analyzer in the component concentration analyzer using the light emitting diode according to any one of the first to fourth embodiments. A diode, a light source control unit, a probe, an incident optical path, a detection optical path, and an LED temperature detection unit; the analyzer includes a component concentration calculation unit; the intensity of the first scattered light measured by the measurement unit; The scattered light intensity and the operating temperature data are transmitted from the transmission unit to the reception unit of the analyzer. According to the present embodiment, the measuring instrument can be used by being permanently installed in, for example, an agricultural field, and the analyzer uses the data transmitted from the measuring instrument to determine whether the device is abnormal or the installation state is maintained. Can also be analyzed.

  In the sixth embodiment of the present invention, in the component concentration analyzer using the light emitting diode according to any one of the first to fifth embodiments, for each light emitting diode, the peak wavelength based on the individual difference of the light emitting diode. In this case, the peak wavelength measured in advance is used in the calculation of the relative reflectance. According to the present embodiment, it is possible to eliminate the influence due to the individual difference of the light emitting diodes, and it is possible to measure the accurate component concentration.

  The measuring instrument using the light emitting diode according to the seventh embodiment of the present invention measures the intensity of the first scattered light detected by the first detector and the second detection measured for each light emission of the plurality of light emitting diodes. A transmitter that transmits the intensity of the second scattered light detected by the unit and the use temperature data of the light emitting diode detected by the LED temperature detector together with identification data for identifying the measuring instrument and measurement time data. . According to the present embodiment, it is possible to eliminate the influence of the operating temperature of the light emitting diode, and it is possible to analyze the abnormality of the device and the maintenance state of the installation state using the data transmitted from the measuring instrument. .

Embodiments of the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a configuration diagram of a component concentration analyzer using a light emitting diode according to an embodiment of the present invention.
The component concentration analyzer using the light emitting diode according to this embodiment includes a measuring device 10 and an analyzer 30.
The measuring instrument 10 includes a plurality of light emitting diodes 11 having different wavelengths, a light source control unit 12 that sequentially emits the plurality of light emitting diodes 11, and a probe 20 that closely contacts the incident unit 21 and the light receiving units 22 and 23 to the surface of the measurement object. An object temperature detector 24 for measuring the surface temperature of the object to be measured, an LED temperature detector 13 for measuring the operating temperature of the light emitting diode 11, a clock unit 14 for measuring the time, and the light emitting diode 11 And a light emission time changing unit 15 for changing the light emission time. For example, the light emission time changing unit 15 changes the light emission time when changing the measurement object, and sets the incident light intensity suitable for the measurement object. When the object to be measured is a fruit, the light emission time is made longer for a fruit having a thick epidermis than for a fruit having a thin epidermis, such as a tomato.

For example, when the sugar content of tomato is measured, the plurality of light emitting diodes 11 preferably use five wavelengths of 860 nm, 900 nm, 935 nm, 950 nm, and 1015 nm.
Light emission (incident light) from the plurality of light emitting diodes 11 is guided to the incident portion 21 by the incident light path 25 through the light collecting portion 25a. The plurality of light emitting diodes 11 are always in the same light emitting order, and when five light emitting diodes 11 are used, light of all five wavelengths is emitted one wavelength at an equal interval and is incident on the measurement object.
The first light receiving unit 22 and the second light receiving unit 23 have different distances from the incident unit 21. It is preferable that the first light receiving unit 22 and the second light receiving unit 23 have the same direction from the incident unit 21.
The scattered light received by the light receiving units 22 and 23 is guided to the detection unit 16 by the detection light paths 26 and 27. The first detection light path 26 guides the first scattered light received by the first light receiving unit 22 to the first detection unit 16a. The second detection light path 27 guides the second scattered light received by the second light receiving unit 23 to the second detection unit 16b. A first filter 26 a is provided in the first detection optical path 26, and a second filter 27 a is provided in the second detection optical path 27.

The storage unit 17 stores the intensity of the first scattered light detected by the first detection unit 16a and the second scattered light detected by the second detection unit 16b for each measurement by light emission of the plurality of light emitting diodes 11. Data on the intensity, the surface temperature detected by the object temperature detection unit 24, and the use temperature of the light emitting diode 11 detected by the LED temperature detection unit 13 are stored.
In the storage unit 17, the measurement time data of the light emitting diode 11 is stored by the clock unit 14, and the light emission time data of the light emitting diode 11 is stored by the light emission time changing unit 15.
The intensity of the first scattered light detected by the first detector 16a and the second scattering detected by the second detector 16b, measured for each light emission of the plurality of light emitting diodes 11, and stored in the storage unit 17. Light intensity, surface temperature detected by the object temperature detection unit 24, use temperature of the light emitting diode 11 detected by the LED temperature detection unit 13, measurement time from the clock unit 14, and light emission from the light emission time changing unit 15 The time data is transmitted from the transmission unit 18 together with identification data for identifying the measuring instrument 10.
Note that the measuring instrument 10 preferably includes a power supply unit 19 in the apparatus. Power is supplied from the power supply unit 19 to the light source control unit 12, the clock unit 14, and the transmission unit 18.

Data transmitted from the transmission unit 18 is received by the reception unit 31 of the analyzer 30.
The analyzer 30 includes an LED peak wavelength storage unit 51, an absorption coefficient storage unit 52, a use temperature correction data storage unit 53, and a surface temperature correction data storage unit 54.
The LED peak wavelength storage unit 51 stores peak wavelength data for each individual LED 11 measured by the LED peak wavelength measuring means 55. The light emitting diode 11 incorporated in the measuring instrument 10 is measured by the LED peak wavelength measuring means 55 for each peak wavelength of each light emitting diode 11 when the measuring instrument 10 is manufactured. The LED peak wavelength measuring means 55 may be a deviation amount from a reference peak wavelength in addition to the case of measuring the peak wavelength itself.
The absorption coefficient storage unit 52 stores absorption coefficient data determined according to the combination of wavelengths for the measurement target component in the measurement target. For the measurement target component in the measurement target, the absorbance characteristic due to the difference in wavelength is measured in advance, and the absorption coefficient according to the combination of wavelengths used for calculation is determined by the absorption coefficient determination means 56.
The use temperature correction data storage unit 53 stores relation data between the use temperature and the peak wavelength. As the operating temperature increases, the peak wavelength shifts in a longer direction.
The surface temperature correction data storage unit 54 stores relationship data between the surface temperature and the component concentration. In the case of sugar content, the component concentration shifts in the direction of increasing as the surface temperature increases.

Data received by the receiving unit 31 is stored in the received data storage unit 32.
In the LED peak wavelength reading unit 41, based on identification data for identifying the measuring device 10 stored in the received data storage unit 32, the peak wavelength for each light emitting diode 11 incorporated in the measuring device 10 is converted into the LED. Read from the peak wavelength storage unit 51.
The use temperature reading unit 42 reads use temperature data of the light emitting diode 11 detected by the LED temperature detection unit 13 from the reception data storage unit 32.
In the LED peak wavelength correction unit 33, the peak wavelength of the light emitting diode 11 read by the LED peak wavelength reading unit 41, the use temperature data of the light emitting diode 11 read by the use temperature reading unit 42, and the use temperature correction data storage unit 53. The LED peak wavelength is corrected based on the relationship data between the use temperature and the peak wavelength stored in.

The calculation target component determination unit 34 determines a component to be calculated. For example, it is determined whether the calculation target component in the fruit has sugar content or acidity.
When the calculation target component determination unit 34 determines the component to be calculated, the LED selection unit 35 selects the light emitting diode 11 used for the calculation.
In the LED selection unit 35, for example, when the calculation target in the fruit is sugar, the first light emitting diode 11a, the second light emitting diode 11b, and the third light emitting diode 11c are selected, and the calculation target in the fruit is selected. In the case of acidity, the first light emitting diode 11a, the fourth light emitting diode 11d, and the fifth light emitting diode 11e are selected.
When the LED selection unit 35 selects the light emitting diode 11 used for the calculation, the LED peak wavelength correction unit 33 may correct the peak wavelength of the selected light emitting diode 11.

The absorption coefficient reading unit 43 reads the absorption coefficient based on the peak wavelength corrected by the LED peak wavelength correction unit 33 from the absorption coefficient storage unit 52.
In the scattered light intensity reading unit 44, the intensity of the first scattered light detected by the first detection unit 16a and the intensity of the second scattered light detected by the second detection unit 16b are read from the reception data storage unit 32. .
The component concentration calculation unit 36 obtains the relative reflectance from the intensity of the first scattered light and the intensity of the second scattered light read by the scattered light intensity reading unit 44, and the relative reflectance and the absorption coefficient reading unit 43 The component concentration is calculated from the read absorption coefficient.

In the component concentration calculation unit 36, for example, when three wavelengths are used, the following calculation is performed.
The intensity of the first scattered light by the first light emitting diode 11a is represented by I1 _{. λ1 is} the intensity of the second scattered light I2 _. and _.lambda.1, according to the second light emitting diode 11b, and the intensity of the first scattered light _{I 1. λ2 is} the intensity of the second scattered light I2 _{. It is} assumed that _λ2 and the intensity of the first scattered light by the third light emitting diode 11c is I1 _{. λ3} , the intensity of the second scattered light is I2 _{. Let λ3} .
If the relative reflectances of the three wavelengths are R _λ1 , R _λ2 , R _λ3 ,
R _λ1 = I2 _{. λ1} / I1 _{. λ1} , R _λ2 = I2 _{. λ2} / I1 _{. λ2} , R _λ3 = I2 _{. λ3} / _{I 1. λ3} .
If the concentration is C and the absorption coefficients are k ₀ and k ₁ , the concentration C is calculated by the following equation.
C = k ₀ + k ₁ * In (R _{λ 1} / R _{λ 3} ) / (R _{λ 2} / R _{λ 3} )

The surface temperature reading unit 45 reads the surface temperature detected by the object temperature detection unit 24 from the reception data storage unit 32.
In the temperature correction calculation unit 37, based on the component concentration calculated by the component concentration calculation unit 36, the surface temperature read by the surface temperature reading unit 45 and the surface temperature and component concentration stored in the surface temperature correction data storage unit 54. From the relation data, the component concentration after temperature correction is calculated.
The component concentration calculated by the temperature correction calculation unit 37 is stored in the reception data storage unit 32. The first scattered light intensity, the second scattered light intensity, the surface temperature, the use temperature, the measurement time, and the light emission. The time and identification data are stored in the data storage unit 38.
The data storage unit 38 only needs to store identification data, measurement time, and component concentration, but other data can be stored to analyze device abnormalities and installation state maintenance. can do.

By transmitting these data stored in the data storage unit 38 from the transmission unit 39, the mobile terminal 60 can grasp the situation.
Data transmitted from the transmission unit 39 is received by the reception unit 61 of the portable terminal 60, and the received data can be stored in the storage unit 62 and displayed on the display unit 63.

  In addition, although the component density | concentration analyzer using the light emitting diode by a present Example showed the case where it comprised with the measuring device 10, the analyzer 30, and the portable terminal 60, the measuring device 10, the analyzer 30, the portable terminal 60, May be configured integrally, or the analyzer 30 and the portable terminal 60 may be configured integrally. Moreover, it is preferable to give the measuring instrument 10 a display function.

  The component concentration analyzer using the light emitting diode of the present invention can be used for analysis of sugar and acidity of fruits, analysis of blood sugar level of human body, and the like.

DESCRIPTION OF SYMBOLS 10 Measuring instrument 11 Light emitting diode 12 Light source control part 13 LED temperature detection part 14 Clock part 15 Light emission time change part 16 Detection part 17 Memory | storage part 18 Transmission part 20 Probe 21 Incident part 22 1st light-receiving part 23 2nd light-receiving part 24 Object temperature detection unit 25 incident optical path 26 first detection optical path 27 second detection optical path 30 analyzer 60 portable terminal

Claims (7)

A plurality of light emitting diodes having different wavelengths;
A light source controller that sequentially emits the light emitting diodes;
A probe for closely attaching the incident part and the light receiving part to the surface of the measurement object;
An incident optical path for guiding incident light from the light emitting diode to the incident portion;
A detection optical path for guiding scattered light received by the light receiving unit to the detection unit;
An LED temperature detection unit for measuring a use temperature of the light emitting diode;
As the light receiving unit, the first light receiving unit and the second light receiving unit that have different distances from the incident unit,
As the detection light path, the first detection light path that guides the first scattered light received by the first light receiving unit to the first detection unit, and the second light received by the second light receiving unit. A component concentration analyzer using a light emitting diode having the second detection light path for guiding scattered light to the second detection unit,
The intensity of the first scattered light detected by the first detection unit, the intensity of the second scattered light detected by the second detection unit, measured for each light emission of the plurality of light emitting diodes, and the A storage unit for storing the use temperature of the light emitting diode detected by the LED temperature detection unit;
In calculating the relative reflectance from the intensity of the first scattered light and the intensity of the second scattered light, the peak wavelength stored in advance for the light-emitting diode and the LED temperature detection unit are measured. Further, from the use temperature data of the light emitting diode and the relation data between the use temperature data and the peak wavelength, the peak wavelength is corrected, and the component concentration is determined using the absorption wavelength based on the corrected peak wavelength. A component concentration analyzing apparatus using a light emitting diode, comprising: a component concentration calculating unit for calculating. An object temperature detector for measuring the surface temperature of the object to be measured;
The storage unit stores the surface temperature detected by the object temperature detection unit,
2. The component concentration analysis apparatus using a light emitting diode according to claim 1, wherein temperature correction of the component concentration calculated by the component concentration calculation unit is performed based on the surface temperature.   A light emission time changing unit that changes the light emission time of the light emitting diode in accordance with the change of the measurement object, and the light source control unit causes the light emitting diode to emit light at the light emission time changed by the light emission time changing means. A component concentration analyzer using the light emitting diode according to claim 1 or 2.   The light emitting diode according to any one of claims 1 to 3, wherein a combination of the light emitting diodes to be calculated by the component concentration calculation unit is changed according to the measurement target component to be measured. Concentration analyzer using It consists of a measuring instrument and an analyzer,
The measuring device includes the light emitting diode, the light source control unit, the probe, the incident optical path, the detection optical path, and the LED temperature detection unit,
The analyzer includes the component concentration calculator.
Transmitting the intensity of the first scattered light, the intensity of the second scattered light, and the use temperature data measured by the measuring device from a transmitting unit to a receiving unit of the analyzer. A component concentration analyzer using the light-emitting diode according to claim 1.   The difference in peak wavelength based on individual differences of the light emitting diodes is measured in advance for each of the light emitting diodes, and the peak wavelength measured in advance is used in the calculation of the relative reflectance. Item 6. A component concentration analyzer using the light-emitting diode according to any one of Items 5 to 6. A plurality of light emitting diodes having different wavelengths;
A light source controller that sequentially emits the light emitting diodes;
A probe for closely attaching the incident part and the light receiving part to the surface of the measurement object;
An incident optical path for guiding incident light from the light emitting diode to the incident portion;
A detection optical path for guiding scattered light received by the light receiving unit to the detection unit;
An LED temperature detection unit for measuring a use temperature of the light emitting diode;
As the light receiving unit, the first light receiving unit and the second light receiving unit that have different distances from the incident unit,
As the detection light path, the first detection light path that guides the first scattered light received by the first light receiving unit to the first detection unit, and the second light received by the second light receiving unit. A measuring instrument using a light emitting diode having the second detection light path for guiding scattered light to the second detection unit,
The intensity of the first scattered light detected by the first detection unit, the intensity of the second scattered light detected by the second detection unit, measured for each light emission of the plurality of light emitting diodes, and the A measuring device using a light emitting diode, comprising: a transmitting unit that transmits the use temperature data of the light emitting diode detected by an LED temperature detecting unit together with identification data for identifying the measuring device and measurement time data.