JP4705457B2 - Irradiance measuring method and irradiance measuring apparatus using radiation intensity meter - Google Patents

Description

  The present invention relates to an apparatus for irradiating a test piece with light from an artificial light source in order to evaluate the stability of the material constituting the test piece to light by exposing the test piece. It relates to a method and technique for measuring.

  It is a well-known fact that materials such as plastic and paint change or change color when used outdoors and exposed to sunlight. These are generally referred to as deterioration, and the function set in the initial stage is lost. These discoloration and alteration are thought to occur because the material has been altered by photochemical reaction.

  When a pharmaceutical product is shipped from a manufacturing factory, it is transported, stored and stored, and then administered to a patient for use. In the meantime, the pharmaceutical product is exposed to light from an artificial light source such as sunlight or lighting. Certain pharmaceuticals may be exposed to these lights during administration or use. In pharmaceuticals, the main components are altered by photoreaction and their efficacy is reduced, and if it is more dangerous, if the photoreaction triggers the production of harmful substances to the human body, it can cause serious damage to the recipient. become.

  It is a well-known fact that organic compounds, which are the above materials, generally undergo a photochemical reaction even when they are exposed to light over a long period of time, resulting in significant changes due to prolonged use or exposure. . In order to suppress photochemical reaction as much as possible, change the material, add additives to delay or suppress the photochemical reaction, or limit the photoreaction to a certain allowable range, during transportation, storage, storage, use In some cases, it is necessary to take countermeasures such as providing restrictions on light irradiation. Therefore, before such products are shipped to the market, it is essential to carry out a test called a photostability test and confirm that the influence of the photochemical reaction is within an acceptable range. .

  The light stability test apparatus uses an artificial light source containing a component of light included in sunlight that reaches the ground, and irradiates light from the artificial light source onto a test piece installed in the optical path of these artificial light sources. Is. By analyzing the specimen after the specimen has been exposed to a certain amount of light and examining the extent of material alteration, the stability can be evaluated or the above countermeasures can be determined. The degree of progress of the photochemical reaction that causes the alteration of the material due to such light irradiation is considered to be proportional to the amount of light irradiated to the material, and in conducting the light stability test, Usually, the amount of exposure is defined. Therefore, it is a very important test element to measure the exposure dose in the light stability test apparatus.

  An instrument such as an illuminance meter or an ultraviolet intensity meter is usually used for measuring the exposure light amount. The illuminometer is used to measure the illuminance of visible light having a wavelength of 380 to 780 nm. An ultraviolet intensity meter is generally used to measure the intensity of ultraviolet rays in the wavelength range of 315 to 400 nm to 320 to 400 nm. Ultraviolet light in this wavelength range is generally referred to as UV-A. Sunlight reaching the ground includes infrared light with a wavelength of 800 nm or more, but the photochemical reaction is usually considered to be caused by light with a short wavelength, and long-wavelength infrared light is measured. It is not the target. In some cases, UV-B (280 to 315 nm to 290 to 320 nm) having a wavelength of 300 nm or less and UV-C (180 to 290 nm to 100 to 280 nm), such as UV-C (180 to 290 nm to 100 to 280 nm), may be tested. A radiation intensity meter corresponding to the wavelength range of is used to measure the amount of exposure.

Decomposing light for each wavelength that constitutes it is called spectroscopy, but when light from sunlight or light from an artificial light source is dispersed, a spectrum is obtained as is well known. The visible light spectrum is perceived by the human eye as a different color for each wavelength of light, and this is expressed by the relative value of the intensity for each wavelength. Spectral irradiance is defined as the value obtained by assigning the relative intensity at each wavelength of this spectrum to the absolute intensity expressed in units such as W / m ^{2. In} the case of sunlight, it is as shown in FIG. The irradiance of light in a certain wavelength range is obtained by integrating the spectral irradiance of FIG. 1 in the wavelength range. In FIG. 1, the irradiance of visible light (wavelength 380 to 780 nm) is an integral value of a spectral irradiance curve in the wavelength range. Similarly, the irradiance in the ultraviolet region (for example, 320 to 400 nm in UV-A) is an integral value of the spectral irradiance curve in the wavelength region portion. These measured quantities are collectively called radiation quantities. Here, as is generally understood in the field of optics targeted by the present invention, the spectral irradiance and the spectrum are defined as follows and used separately. The spectral irradiance represents the absolute light intensity at each wavelength, and the spectrum represents the relative intensity distribution. In other words, the two are in a proportional relationship with each other.

It becomes. Here, E (λ) is a spectral irradiance, S (λ) is a spectrum, and a is a proportionality constant.

  In contrast to this radiation amount, illuminance is one of the light measurement amounts, which is called light measurement, and measures the light intensity based on the sensitivity of the human eye. The illuminometer used to measure this amount is adjusted using a filter or the like so that it has a sensitivity distribution (referred to as spectral response) that approximates the relative luminous efficiency specified by the International Academy of Illumination. Has been. FIG. 2 shows a state in which sunlight is measured with an illuminometer having such spectral response. 1) shows the relative luminous efficiency specified by the International Lighting Association. This specific visual sensitivity is specified in the wavelength range of 380 to 780 nm, and is zero in other wavelength ranges. As can be seen from the above definition in the case of sunlight in FIG. 1, a certain constant is added to the integral value of the spectral irradiance of sunlight multiplied by the relative visibility (curve shown by 2 in FIG. 2). The numerical value obtained by multiplication is the illuminance. As can be seen from this, the illuminometer can be considered as the intensity of light in the visible light range measured by a measuring instrument having an internationally defined spectral response.

  On the other hand, in the measurement of ultraviolet intensity, there is no internationally defined spectral response like illuminance, and therefore there is no amount corresponding to the photometric quantity. Therefore, the intensity of light in a specific wavelength range in the ultraviolet region can be expressed only by the amount of radiation called irradiance obtained by integrating the spectral irradiance of the light source in the wavelength range. In order to measure this irradiance with a single device without decomposing the target light into a spectrum, a measuring instrument that has a sensitivity of 1 in the wavelength range and zero sensitivity in the other wavelength ranges is required. It becomes. However, in reality, it is impossible to create a measuring instrument having such spectral response, and by combining a filter that transmits light in the wavelength range, the spectral response as shown in FIG. At present, it is necessary to manufacture and measure a measuring instrument. In the present invention, a measuring instrument having such spectral response is referred to as a radiation intensity meter or an ultraviolet intensity meter.

In Patent Document 1, in order to easily and always measure specific ultraviolet information for a specific action curve from an actual measurement value measured by an ultraviolet light receiving element whose spectral characteristics are known in advance, it was measured by an ultraviolet light receiving element. The actual measurement value, the actual measurement value is predicted from the spectral sensitivity of the ultraviolet light receiving element and the solar spectral emission spectrum, the predicted value of the entire region, and the specific action curve and the specific prediction predicted from the spectral sensitivity and the solar spectral emission spectrum A technique is disclosed that corrects based on a predicted value of a region and obtains specific ultraviolet ray information. Further, Patent Document 2 and Patent Document 3 disclose techniques relating to a photometric measurement method.
JP 2004-317318 A Paper published in Measurements of Optical Radiation Hazards-A Reference Book Based on Presentations Given on Optical Radiation Hazards, September 1-3, 1998 Gaithersburg, Maryland, ICNIRP 6/98, CIEx016-1998, 445-453 (1998) '' Photometry-The CIE V (λ) Function and What Can be Learned from Photometry ”by Y. Ohno and AE Thompson National Institute of Standards and Technology Gaithersburg, MD, USA “Gigahertz-Optik Application & Product Guide 2004” Page 146-Calibration Service a (z) Calibration Correction Factor for known Light Sources

A photoelectric conversion element is usually used as the light receiving element of the ultraviolet intensity meter, and when this element receives light, it generates a current proportional to the intensity. Using this fact, when a certain current value is measured, it is calibrated so that it is output as a specific irradiance. Calibration measures light from a light source with a known spectral irradiance in the target wavelength range (300-400 nm here)
[Integral value of spectral irradiance in the target wavelength range of the light source, that is, irradiance] = [calibration coefficient] × [current value measured at that time] (2)
This is done by determining the calibration coefficient so that

  When calibration is performed, a light source having a strong light emission in the wavelength range is used as a light source having a known spectral irradiance. One of them is black light. Fig. 4 shows the spectral irradiance 1) of the black light, the spectral response 2) of the UV intensity meter, and 3) multiplied by both. When receiving the light of the black light, the UV intensity meter generates a current proportional to the wavelength integral value of the curve in 3), and determines the calibration coefficient so that the relationship of equation (2) is established. When measuring black light using a UV intensity meter calibrated in this way, its spectrum is similar to that of the black light used for calibration, and the numerical value read from the UV intensity meter is the black used for the measurement. It represents the irradiance of the light.

  Here, not only the black light but also a xenon lamp, a white daylight fluorescent lamp, a metal halide lamp or the like is used as a light source used in the light stability test apparatus, and these lamps have a spectrum that is significantly different from that of the black light. When using a UV intensity meter calibrated with a black light and measuring light from a light source with a spectrum different from that of the black light, the numerical value output as irradiance from the UV intensity meter is the actual radiation of the light source being measured. It does not reflect illuminance and is a physically meaningless value.

The phenomenon will be described more specifically using schematic diagrams. FIG. 5 schematically shows a procedure for calibrating the ultraviolet intensity meter using a black light. The vertical axis represents the spectral response of the ultraviolet intensity meter or the spectral irradiance of black light, and the horizontal axis represents the wavelength of light. 1) simulates the spectral response of the UV intensity meter, and 2) simulates the spectral irradiance of the black light. The irradiance of black light is expressed by the area under the line of 2), and can be obtained as 1/2 by actually performing integral calculation. On the other hand, the UV intensity meter detects black light as shown in 3). 3) is the product of 1) and 2). When the UV intensity meter is irradiated with black light in the situation shown in FIG. 5, the UV intensity meter outputs a current proportional to the area (1/3) under 3). Assuming a proportionality constant of 1, this output is 1/3 amp. At this time, since 1/2 is obtained by multiplying this output current by 3/2, the actual irradiance is multiplied by 3/2 and the unit of irradiance (for example, W / m). Calibration is to display in ² ). The UV intensity meter calibrated in this way always outputs a correct irradiance value when measuring a light source having a spectrum similar to that shown in FIG.

Next, a case where a light source having a different spectrum is measured using this ultraviolet intensity meter will be schematically considered. FIG. 6 schematically shows this situation. 1) simulates the spectral response of the UV intensity meter, and 2) simulates the spectral irradiance of this light source. The irradiance of this light source is the area under the line of 2). On the other hand, the UV intensity meter detects the light from this light source as shown in 3). 3) is the product of 1) and 2). When the ultraviolet intensity meter is irradiated with this light source in the situation shown in FIG. 6, the ultraviolet intensity meter outputs a current proportional to the area (1/2) under 3). Since the proportionality constant was set to 1 earlier, this output is 1/2 ampere. At this time, 3/4 obtained by multiplying the output current by the previously obtained calibration coefficient 3/2 is a value displayed by the ultraviolet intensity meter as the irradiance of the light source at this time. As described above, the irradiance of this light source is 1, and 3/4 which is the output of the ultraviolet intensity meter does not reflect the actual situation. As described above, when an ultraviolet intensity meter calibrated with a light source having a certain spectrum is used for measurement of another light source having a different spectrum, a numerical value different from the actual irradiance of the light source to be measured is output.

  The above means that the results cannot be compared with each other when testing with separate light stability test equipment with different light sources, and the reliability of the light stability test is remarkably increased. To be damaged. This is a problem inherent in the calibration method of the ultraviolet intensity meter, and the cause of the problem is that the measurement value is physically meaningless as described above. When prescribing the light exposure in the ultraviolet region, it is possible to prescribe a physically meaningful numerical value by using the irradiance, which is the integral value of the spectral irradiance in the wavelength range. It becomes possible.

  In the above description, the method according to the present invention has been described using a photoelectric conversion element that generates a current by light as an example. However, the method according to the present invention can also be applied to cases where other types of light receiving elements are used. Does not limit the scope of the invention.

  The present invention provides a method for converting a value measured by an ultraviolet intensity meter into irradiance and an irradiance measuring apparatus having the means, and improves the reliability of the result by applying it to a light stability test apparatus. With the goal.

  As can be seen from the above description, when measuring the light of a light source of a different type from the light source used for calibration, the cause of this problem is that the irradiance of the light source is not displayed correctly because the spectrum shape is different. It is. The following methods can be considered as means for solving this problem.

1) When a UV intensity meter is calibrated with a light source having the same spectrum as the light source to be measured and a light source having a plurality of different spectra is to be measured, a plurality of UV intensity meters calibrated with a light source having the same spectrum as the measurement target are used. Prepare the same number (the same number as the type of light source spectrum) and use it according to the measurement target.

2) Correct the output value of the UV intensity meter according to the spectrum of the light source to be measured.

  1) can achieve the object by calibrating the ultraviolet intensity meter using the same light source as that to be measured by the method described above. However, this method complicates the optical system necessary for calibration, and requires a UV intensity meter calibrated with a standard light source having the same spectrum for each light source to be measured, which increases costs. At the same time, it is not desirable from the viewpoint of versatility of equipment.

2) is a method for measuring irradiance according to the present invention, and the above problem is solved by the following method. That is, the irradiance measurement method according to the present invention uses a radiation intensity meter calibrated by a light source having a specific spectral response, a specific spectrum, and a spectral irradiance valued. A method for measuring irradiance in a specific wavelength range, wherein the measured value measured by the radiant intensity meter is a spectral irradiance of a light source used for calibration of the radiant intensity meter or an integral value of the spectrum in the wavelength range. And the value obtained by integrating the product of the spectral irradiance or spectrum of the light source used for calibration of the radiant intensity meter and the spectral response of the radiant intensity meter in the wavelength range, and the spectral irradiance or spectrum of the light source to be measured. Correct based on the integral value in the wavelength range and the value obtained by integrating the spectral irradiance of the light source to be measured or the spectrum and the spectral response of the radiometer in the wavelength range. And obtaining the irradiance of the measurement target light source in the wavelength range.

  This is because the display value 3/4 of the UV intensity meter obtained under the situation described in FIG. 6 is used for the spectral response of the UV intensity meter and the spectrum of the light source used in the calibration of the UV intensity meter (here, the black light intensity). Spectrum) and the spectrum of the light source to be measured, and the actual irradiance value of the light source to be measured is calculated. The procedure is as follows. The process of displaying the display value 3/4 as a measurement value by the UV intensity meter is to multiply the output current 1/2 amp of the UV intensity meter by 3/2 incorporated as a calibration factor as described above. By dividing the displayed value 3/4 of the ultraviolet intensity meter by the calibration coefficient 3/2, 1/2 ampere, which is the output current when measuring the main light source of the ultraviolet intensity meter, is calculated. At this time, since the actual irradiance of the main light source is 1, the calibration value for the main light source can be set to 2. In this way, when the output current of 1/2 ampere is multiplied by the calibration coefficient 2 corresponding to the spectrum of the main light source, 1 that is the actual irradiance of the main light source can be obtained.

  From the above, if the spectral response of the UV intensity meter, b) the spectrum of the light source used during calibration of the UV intensity meter, and c) the spectrum of the light source to be measured are known, the spectrum illustrated in Fig. 62) Even when a light source having a light source is measured, the irradiance of the target light source can be measured. As described above, since the spectral irradiance and the spectrum are in a proportional relationship, there is no problem even if the spectrum is read as the spectral irradiance in the above b) and c). Needless to say, the data in a), b) and c) can be measured separately, and are measured independently from the calibration of the UV intensity meter and the measurement of the light source using the UV intensity meter. And available data.

  The inconvenience caused by the fact that the spectrum of the calibration light source of the UV intensity meter and the light source to be measured do not match is not only that the indicated value of the UV intensity meter has no physical meaning as described above. The UV intensity meter is normally calibrated using a silicon photodiode as a sensor, but a filter or diffuser is placed in front of the sensor to provide the specified spectral response. These materials vary in properties depending on the production lot, and are not uniform even in the same lot. The fact that the light transmission characteristics slightly change depending on the place of use is unavoidable in the production process. Therefore, ultraviolet intensity meters manufactured using these materials have individual differences in their spectral responsivity as a result of the above-described variation in material characteristics.

  By using the method according to the present invention, it becomes possible to measure the irradiance of the light source to be measured, and simultaneously correct variations in measured values due to individual differences in the spectral response of the UV intensity meter. It is possible to greatly improve the measurement accuracy of exposure dose, that is, the reliability of the light stability test.

The irradiance measuring apparatus according to the present invention includes a radiance meter calibrated by a light source having a specific spectral response, a specific spectrum, and a spectral irradiance valued, and calibration of the radiance meter. means for inputting spectral irradiance or spectral data of the light source, the data of the spectral responsivity of the radiation intensity meter, and the data of the spectral irradiance or the spectrum of the measurement target light source used for, use in the calibration of the radiation intensity meter Means for storing the spectral irradiance or spectrum data of the light source, the spectral irradiance or spectrum data of the light source to be measured, and the spectral response data of the radiation intensity meter, and the light source used for calibration of the radiation intensity meter. spectroscopic data of the irradiance or spectral integrated at a specific wavelength range, the spectral irradiance or scan of the light source used for calibration of the radiation intensity meter The product of the data of the spectral responsivity of the data and the radiation intensity meter vector is integrated by the specific wavelength range, the data of the spectral irradiance or spectrum of the measurement target light source is integrated with said specific wavelength range, of the measurement target light source A calculation unit that integrates the product of spectral irradiance or spectral data and spectral responsiveness data of the radiance intensity meter in the specific wavelength range, and using these integration values, the radiance intensity meter uses the light of the light source to be measured. By calculating and storing a correction coefficient for the output value obtained by measuring and correcting the output value obtained by measuring the light of the measurement target light source with the radiation intensity meter based on the correction coefficient, It has a means which calculates | requires the irradiance in the said wavelength range of a measuring object light source.

  Hereinafter, the effects of the present invention will be described in more detail with reference to examples.

  Note that the method according to the present invention is not limited to the wavelength range described in the following examples, and can be easily inferred from the principle of the invention. It can be applied regardless of whether or not.

  By applying the irradiance measuring method and the irradiance measuring apparatus according to the present invention, it becomes possible to measure the irradiance in the target wavelength range of various light sources having various spectra.

  By applying the irradiance measuring method and the irradiance measuring apparatus according to the present invention, it is possible to accurately measure the amount of exposure by ultraviolet irradiation in the light stability test apparatus, and to carry out a reliable light stability test. Can do.

  An embodiment of the invention will be described based on an example with reference to the drawings.

  An example in which the ultraviolet intensity of a xenon light source (referred to as an Xe lamp) having a spectrum different from that of black light is measured using an ultraviolet intensity meter calibrated with black light is shown. 4) Using the ultraviolet intensity meter having the spectral response shown in FIG. 4) calibrated with the black light having the spectral irradiance shown in FIG. 41), the ultraviolet ray of the Xe lamp having the spectrum shown in FIG. The strength was measured. By the way, the spectrum of the Xe lamp shown in Fig. 71) is the spectrum of the light that reaches the measurement surface after adjusting the spectrum by installing a filter, reflector, etc. between the light source and the spectral irradiance measurement surface. It is.

  The concept of the correction coefficient described in the previous section will be described more specifically using mathematical expressions. Hereinafter, integration in the target wavelength region is used for ultraviolet intensity, etc., but the target ultraviolet region of this embodiment is a wavelength range of 300 to 400 nm, and the integration range of the integration formula used in the description of this embodiment is not particularly specified. This area is assumed unless there is. If the spectral irradiance of the black light is E (λ) and the spectral response of the UV intensity meter is R (λ), the irradiance represented by the integrated value in the target area in Fig. 41) is

The integrated value of the product of the spectral response and spectral irradiance of the UV intensity meter represented by 3) is

It is represented by here,
λ ₁ is 300 and λ ₂ is 400 nm. If the relative intensity of the spectrum of the Xe lamp is S (λ), the integral value of the spectrum of the Xe lamp in Fig. 71) is

The integral of the product of the spectrum shown in Fig. 72) and the spectral response of the UV intensity meter is

It is represented by

  As can be seen from the explanation in the previous section, the correction coefficient when measuring the Xe lamp with the UV intensity meter is

It is represented by When each integral value of the above equation (3) is obtained by numerical integration of data, the correction coefficient represented by the equation (3) in this embodiment is obtained as 1.43. That is, the irradiance value of the Xe lamp can be obtained by multiplying the display value when the Xe lamp is measured with the ultraviolet intensity meter by 1.43. Conversely, the indication value obtained by measuring the light of the Xe lamp with this ultraviolet intensity meter is only 1 / 1.43 of the actual irradiance in the ultraviolet region of the Xe lamp.

  Even if the relative spectral response is used instead of the spectral response in equation (3), a proportional relationship is established between the two, and the result is the same.

  Next, the power of the Xe lamp was adjusted, and the emission intensity of the lamp was adjusted to measure with a spectral irradiance meter. Under the same conditions, the light of the lamp was measured with an ultraviolet intensity meter. By integrating the data of the obtained spectral irradiance meter numerically, the integrated value at 300 to 400 nm was calculated, and the actual irradiance in this wavelength range was obtained. A plot of these results is shown in FIG. Naturally, a straight line relationship is established, and when an approximate straight line is obtained using the least square method, the slope is obtained as 1.433. It can be seen that this inclination corresponds to the above-described correction coefficient and is in good agreement with the above-mentioned numerical value.

  From this example, by using the method disclosed in the present invention, even if light of a light source having a spectrum different from that of the light source used for calibration of the ultraviolet intensity meter is measured with the ultraviolet intensity meter, The value of irradiance can be obtained.

  Three types of UV intensity meters with different spectral responses were prepared. FIG. 9 shows the spectral response. FIG. 10 shows the spectrum of the black light used for calibration (4)) and the product of the spectral response of each UV intensity meter and the spectral relative intensity of the black light. The numbers 1) to 3) in the figure correspond to the numbers of the respective ultraviolet intensity meters in FIG. FIG. 11 shows the product of the spectral response of the ultraviolet intensity meter and the relative spectral intensity of the Xe lamp when the spectrum of the Xe lamp is measured using these ultraviolet intensity meters. 4) in FIG. 11 shows the spectrum of the Xe lamp used for the measurement, and the numbers 1) to 3) correspond to the numbers of the respective ultraviolet intensity meters as in FIG. By calculating each term of the equation (3) based on FIG. 10 and FIG. 11, the correction coefficient of each ultraviolet intensity meter can be obtained, and the value is shown in Table 1. The UV intensity meter 1) with the maximum correction factor is approximately 26% larger than the minimum 2). That is, even if the light of the same Xe lamp is measured under the same conditions, the indicated value of the ultraviolet intensity meter 1) is 26% smaller than that of 2).

  Similar to Example 1, using the spectral irradiance of the Xe lamp measured by a separately calibrated spectral irradiance meter, by integrating from 300 to 400 nm, the true value of the irradiance in the wavelength range of the Xe lamp Asked. Using the three types of UV intensity meters used in this example, measurements were performed under the same optical conditions, and the numerical value obtained by multiplying the result by the correction coefficient in Table 1 is of course the above. It showed a very good agreement with the integrated value of spectral irradiance.

  From this example, it is apparent that individual differences due to variations in the UV intensity meter can be corrected by correcting the measurement value of the UV intensity meter using the method according to the present invention.

  FIG. 12 is a schematic configuration diagram showing the configuration of the irradiance measuring apparatus according to the embodiment of the present invention. In the description of the present embodiment, an ultraviolet intensity meter is used as a specific example in the same manner as in the above-described examples. However, as described above, the scope of the present invention is not limited to the ultraviolet intensity meter.

  A normal ultraviolet intensity meter includes an ultraviolet light receiving element 22, an amplifier 23, an A / D converter 24, and a display unit 26. The irradiance measurement apparatus according to the embodiment of the present invention inputs an input of a spectrum of a light source used for calibration of an ultraviolet intensity meter having a specific spectral response, a spectral response of the ultraviolet intensity meter, and a spectrum of a light source to be measured. Units 10 to 12, storage units 13 to 15 for storing these data, calculation units for calculating the correction coefficient for the light source to be measured by performing wavelength integration and multiplication / division calculation of the product of these data and spectral response and spectrum. 16 to 20, a storage unit 21 for storing the correction coefficient, ultraviolet intensity meters 22 to 24 calibrated with a calibration light source having a spectrum stored in the storage unit 13, output values and correction coefficients of the ultraviolet intensity meter The calculation unit 25 calculates the product and outputs the result, and the display unit 26 displays the result.

  In order to support measurement of a plurality of light sources having different spectra, a plurality of input units to correction coefficient storage units 10 to 21 may be provided and switched according to the light source to be measured.

  The input units 10 to 12 are external memory slots, and can be used as the storage units 13 to 15 by inserting a plug-in memory into which data has been input in advance. Alternatively, the input units 10 to 12 can be omitted by inputting spectrum and spectral response data as specified values. Furthermore, it is possible to replace the memory storing the result of the integration executed in 16-19 with 10-19.

  By providing a plurality of input unit 12, storage unit 15, and calculation unit 19, each using data corresponding to a plurality of light sources, by selecting the data used for calculation of the correction coefficient according to the light source to be measured, It is also possible to support a plurality of light sources.

  It is known that the sensitivity of the radiation intensity meter changes with time according to the use situation. For this reason, calibration is generally performed every certain period and the accuracy is maintained. It is possible to maintain the accuracy of the irradiance measuring apparatus according to the present invention by inputting the spectrum of the calibration light source and the spectral response of the radiation intensity meter again every time calibration is performed.

It is a figure which shows the table | surface of the spectral irradiance of sunlight. It is a figure which shows the ratio of the spectral irradiance regarding the light which an illuminometer senses when measuring sunlight with an illuminometer, and relative spectral response. It is a figure which shows an example of the relative spectral response of an ultraviolet-ray intensity meter. It is a figure which shows the ratio of the spectral irradiance regarding the light which an ultraviolet-ray intensity meter senses when a black light is measured with an ultraviolet-ray intensity meter, and a relative spectral response. It is a figure for demonstrating the calibration of a ultraviolet-ray intensity meter, and is a figure which shows the relationship between relative spectral intensity and a response, and a wavelength. It is a figure for demonstrating the case where the light source which has a different spectrum with an ultraviolet-ray intensity meter, and is a figure which shows the relationship between a relative spectral intensity and a response, and a wavelength. It is a figure for demonstrating the state at the time of measuring a Xe lamp with a ultraviolet-ray intensity meter, and is a figure which shows the relationship between relative spectral intensity and a wavelength. It is a figure which shows the display value relationship in the spectral irradiance integral value (irradiance) of a Xe lamp light source, and a ultraviolet-ray intensity meter. It is a figure which shows the relative spectral response degree of a ultraviolet-ray intensity meter. In an Example, it is a figure which shows the relationship between relative spectral intensity and a wavelength regarding the light which an ultraviolet intensity meter senses when measuring black light with an ultraviolet intensity meter. In an Example, it is a figure for demonstrating the state at the time of measuring a Xe lamp with an ultraviolet-ray intensity meter, and is a figure which shows the relationship between relative spectral intensity and a response, and a wavelength. It is a schematic block diagram which shows the structure of the ultraviolet intensity meter irradiance measuring apparatus which becomes this invention. It is a table | surface which shows the correction coefficient with respect to Xe lamp of each ultraviolet-ray intensity meter.

DESCRIPTION OF SYMBOLS 10 Calibration light source spectrum input part 11 Ultraviolet intensity meter spectral response input part 12 Measurement target light source spectrum input part 13 Calibration light source spectrum storage part 14 Ultraviolet intensity meter spectral response storage part 15 Measurement target light source spectrum storage part 16 Integration calculation part 17 Integral Calculation Unit 18 Product Integral Calculation Unit 19 Integral Calculation Unit 20 Multiplication / Division Calculation Unit 21 Multiplication / Division Calculation Result Storage Unit 22 Ultraviolet Light Receiving Element 23 Amplifier 24 A / D Converter 25 Product Calculation Unit 26 Display Unit

Claims (4)

A method of measuring irradiance in a specific wavelength range of a light source to be measured using a radiance meter calibrated by a light source having a specific spectral response, a specific spectrum, and a spectral irradiance valued. ,
The measured value measured by the radiant intensity meter, the spectral irradiance of the light source used for calibration of the radiant intensity meter or the integrated value in the wavelength range of the spectrum,
The value obtained by integrating the spectral irradiance of the light source used for calibration of the radiant intensity meter or the product of the spectrum and the spectral response of the radiant intensity meter in the wavelength range,
The spectral irradiance of the light source to be measured or the integral value of the spectrum in the wavelength range;
Correct based on the spectral irradiance of the light source to be measured or the product obtained by integrating the spectrum and the spectral response of the radiometer in the wavelength range,
A method for measuring irradiance, characterized in that the irradiance of a measurement target light source in the wavelength range is obtained. A radiation intensity meter calibrated by a light source having a specific spectral response, a specific spectrum and a spectral irradiance value;
Means for inputting said spectral irradiance or spectral data of the light source used for calibration of the radiation intensity meter, the spectral responsivity of the radiation intensity meter data, and the data of the spectral irradiance or spectral measurement target light source,
Means for storing spectral irradiance or spectral data of a light source used for calibration of the radiation intensity meter, spectral irradiance or spectral data of a light source to be measured, and spectral response data of the radiation intensity meter ;
Integrated in a specific wavelength range of data of the spectral irradiance or spectrum of the light source used for calibration of the radiation intensity meter, spectroscopy of the spectral irradiance of the light source used for calibration of the radiation intensity meter or the spectral data radiation intensity meter The product of response data is integrated in the specific wavelength range, the spectral irradiance or spectral data of the measurement target light source is integrated in the specific wavelength range, and the spectral irradiance or spectral data and radiation of the measurement target light source are integrated. An arithmetic unit that integrates the product of spectral response data of the intensity meter in the specific wavelength range ;
By using these integral values, means for calculating and storing a correction coefficient for the output value obtained by measuring the light of the measurement target light source with the radiation intensity meter, and
Based on the correction coefficient, the radiation intensity meter has means for calculating irradiance in the wavelength range of the measurement target light source by correcting the output value obtained by measuring the light of the measurement target light source. Irradiance measuring device. A radiation intensity meter calibrated by a light source having a specific spectral response, a specific spectrum and a spectral irradiance value;
Means for inputting said spectral irradiance or spectral data of the light source used for calibration of the radiation intensity meter, the spectral responsivity of the radiation intensity meter data, and the data of the spectral irradiance or spectral measurement target light source,
Means for storing spectral irradiance or spectral data of a light source used for calibration of the radiation intensity meter, spectral irradiance or spectral data of a light source to be measured, and spectral response data of the radiation intensity meter ;
Integrated in a specific wavelength range of data of the spectral irradiance or spectrum of the light source used for calibration of the radiation intensity meter, spectroscopy of the spectral irradiance of the light source used for calibration of the radiation intensity meter or the spectral data radiation intensity meter The product of the response data is integrated in the specific wavelength range, the spectral irradiance or spectrum data of the measurement target light source is integrated in the specific wavelength range, and the spectral irradiance or spectrum data and radiation of the measurement target light source is integrated. An arithmetic unit that integrates the product of spectral response data of the intensity meter in the specific wavelength range ;
By using these integral values, means for calculating and storing a correction coefficient for the output value obtained by measuring the light of the measurement target light source with the radiation intensity meter, and
Based on the correction coefficient, the radiation intensity meter has means for calculating the irradiance in the wavelength range of the measurement target light source by correcting the output value obtained by measuring the light of the measurement target light source. An irradiance measuring device,
A plurality of measurement target light source A with different spectrum, B, a plurality of means A for storing the data of the spectral irradiance or spectral against the C ', B', 'have, A' C of A in, B ' To store data for B and C for C '
Measurement specified by specifying the type of light source to be measured with the change-over switch provided in the irradiance measuring device and using the spectral irradiance or spectrum data corresponding to the specified light source to be measured in the arithmetic unit Find the irradiance corresponding to the target light source,
An irradiance measuring apparatus comprising means for displaying the irradiance thus obtained and the type of the designated light source to be measured. A radiation intensity meter calibrated by a light source having a specific spectral response, a specific spectrum and a spectral irradiance value;
Means for inputting said spectral irradiance or spectral data of the light source used for calibration of the radiation intensity meter, the spectral responsivity of the radiation intensity meter data, and the data of the spectral irradiance or spectral measurement target light source,
Means for storing spectral irradiance or spectral data of a light source used for calibration of the radiation intensity meter, spectral irradiance or spectral data of a light source to be measured, and spectral response data of the radiation intensity meter ;
Integrated in a specific wavelength range of data of the spectral irradiance or spectrum of the light source used for calibration of the radiation intensity meter, spectroscopy of the spectral irradiance of the light source used for calibration of the radiation intensity meter or the spectral data radiation intensity meter The product of response data is integrated in the specific wavelength range, the spectral irradiance or spectral data of the measurement target light source is integrated in the specific wavelength range, and the spectral irradiance or spectral data and radiation of the measurement target light source are integrated. An arithmetic unit that integrates the product of spectral response data of the intensity meter in the specific wavelength range ;
By using these integral values, means for calculating and storing a correction coefficient for the output value obtained by measuring the light of the measurement target light source with the radiation intensity meter, and
Based on the correction coefficient, the radiation intensity meter has means for calculating irradiance in the wavelength range of the measurement target light source by correcting the output value obtained by measuring the light of the measurement target light source. An irradiance measuring device,
The changeover switch provided in the irradiance measuring device designates the presence or absence of the correction, and means for displaying the irradiance when there is correction, the output value of the radiance intensity meter when there is no correction, and whether or not correction is performed. An irradiance measuring device comprising means for displaying.

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