JPH1172381A - Measuring apparatus for ultraviolet rays - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus by which two kinds of ultraviolet rays (long- wavelength ultraviolet rays UV-A and short-wavelength ultraviolet rays UV-B) having a different influence on a human body can be measured precisely. SOLUTION: In this apparatus, a light receiving window on which a band-pass filter 1 used to transmit ultraviolet rays UV-A at a wavelength of 320 to 400 nm is installed and a light receiving window on which a band-pass filter 2 used to transmit ultraviolet rays at a wavelength of 280 to 320 nm is installed are provided at an ultraviolet measuring and receiving part. At this time, the intensity of the ultraviolet rays UV-A received by the light receiving window and the intensity of the ultraviolet rays UV-B received by the light receiving window are converted into digital amounts by a current-to-voltage converter 5 and an A-D converter 6. The quantity of the ultraviolet rays UV-A and the quantity of the ultraviolet rays UV-B are then computed by a computing circuit 7, and their values are displayed on a display 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring ultraviolet rays in sunlight including artificial sunlight.

[0002]

2. Description of the Related Art Sunlight rays are classified into infrared rays, visible rays, and ultraviolet rays according to their wavelengths. Among them, ultraviolet rays are electromagnetic waves named for light in the wavelength range of 180 to 400 nm, and the shorter the wavelength of the electromagnetic waves, the stronger the energy and the longer the wavelength of infrared rays and visible light, which are almost harmless to living organisms. In comparison, ultraviolet rays are more susceptible to chemical reactions with various substances.For example, the effects on the human body include sunburn, pigmentation, inflammation of the eyes due to reflection of snow in winter, and long-term irradiation due to strong sunshine in summer. Has adverse health effects such as aging of the skin and frequent occurrence of skin cancer. Recently, the ozone in the ozone layer, which exists in the stratosphere at an altitude of about 25 km above the earth, is used as a chlorofluorocarbon gas (refrigerant for coolers and electric refrigerators, a spray propellant, a foaming agent for the production of sponge plastics, etc.) released from our lives. The gas is decomposed by the gas, and the ozone concentration of the ozone layer is reduced, so that the ultraviolet absorption of sunlight by the ozone layer is reduced, and the intensity of the ultraviolet ray reaching the earth increases accordingly. It is said that if ozone is reduced by 10%, ultraviolet intensity is increased by 20%).

[0003] Such ultraviolet rays, on the other hand, require that the vitamin D3 necessary for building bones for the human body is produced by the irradiation of ultraviolet rays, and that human activities in the sun are physically and mentally necessary. Given this, it is necessary to measure the amount of ultraviolet light in order to make the amount of ultraviolet light received by the human body under the sun's rays appropriate.

[0004] The ultraviolet rays are further classified into three types according to the wavelength.
-A, the region of wavelength 280 to 320 nm is referred to as UV-B, and the region of wavelength 180 to 280 nm is referred to as UV-C.
These have different effects on the human body due to the difference in wavelength. That is, UV-A ultraviolet rays reach the dermis of the skin, but UV-B ultraviolet rays having a short wavelength have a large absorption and reach only between the epidermis and the dermis. While the skin burns black, causes skin blemishes and wrinkles, and decreases elasticity,
UV-B causes relatively superficial and transient things such as red swelling, hot flashes and blisters. In addition, UV
Since the ultraviolet ray of -C is absorbed by the above-mentioned ozone layer, it is not necessary to consider reaching the earth.

Conventionally, such specialized equipment for measuring ultraviolet rays for each wavelength is very troublesome and cannot be used by individuals, and an apparatus which can be easily used by anyone collectively covers the entire ultraviolet area. UV-A and UV-B were calculated from the empirical formula.

[0006]

However, the ratio of each of UV-A and UV-B to the total amount of ultraviolet rays actually varies considerably depending on the season, altitude and latitude of the spot, and this is the difference between UV-B and UV-B. Is remarkable. In the atmosphere, only the above-mentioned ozone can absorb UV-B (UV-A hardly changes but UV-B increases by 10% when ozone is reduced by 1%). Further, as described above, the effects of UV-A and UV-B on the human body are greatly different, and their countermeasures are also different. In consideration of these facts, it is necessary to accurately distinguish UV-A and UV-B from each other, and the method of calculating the amount of UV-A and UV-B from the measurement of the entire range of ultraviolet light from 280 to 400 nm is accurate. There was a problem that it could not be judged. Further, in the conventional example, there is an example in which the amount of visible light in sunlight is measured, and the ratio of ultraviolet light to visible light is determined to obtain the amount of ultraviolet light. In this case, not only the total amount of ultraviolet light but also UV-light is used. It is not accurate to determine the amount of ultraviolet light of A and UV-B from the calculation formula.

The present invention has been made in view of the above circumstances, and provides an ultraviolet ray measuring apparatus which can be easily used by an individual and which can accurately measure the amounts of UV-A and UV-B ultraviolet rays. The purpose is to do.

[0008]

In order to achieve the above object, an ultraviolet measuring apparatus according to the present invention has a wavelength of 28 in sunlight.
Ultraviolet rays of 0 to 400 nm are divided into ultraviolet rays of a short wavelength region and ultraviolet rays of a long wavelength region, and each is received, and the amount of each received is displayed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the ultraviolet ray measuring apparatus according to the present invention will be described with reference to FIGS. FIG. 1 is a system block diagram of an ultraviolet ray measuring apparatus, wherein 1 is a wavelength of 320 to 4
Reference numeral 2 denotes a bandpass filter that transmits ultraviolet light UV-A having a wavelength of 280 to 320 nm. 3 and 4 are photodiodes, 5 is a current-voltage converter, 6 is an A / D converter, 7 is an arithmetic circuit, and 8 is a display.

The band-pass filter 1 can transmit only light having a wavelength of 320 to 400 nm among ultraviolet rays.
The bandpass filter 2 has a wavelength of 280 to 32 among ultraviolet rays.
This is a filter that can transmit only 0 nm light. Such a filter that transmits only ultraviolet rays is a relatively special filter. As the band-pass filter 1, for example, the use of ultraviolet ray transmitting glass filters having glass code numbers 5970 and 5840 of a glass filter manufactured by Corning Incorporated in the United States can be considered. For the bandpass filter 2, for example, a multi-cavity type interference filter using three to four combinations of interference is used. However, weather filters and durability are required as interference filters used outdoors. Especially, interference filters for ultraviolet rays are considered to be easy to shift the transmission wavelength, and that the wavelength cut on the long wavelength side is sufficient, etc. It needs to be adopted. Bandpass filter 1
A photodiode 3 and a photodiode 4 are placed behind the band-pass filter 2 and the band-pass filter 2, respectively. The photodiode used here is, for example, a silicon photodiode which employs a quartz glass window having a thin P layer in order to sufficiently provide sensitivity to ultraviolet rays.

The short-circuit current of the photodiodes 3 and 4 flowing according to the intensity of the ultraviolet light received is determined by the current-voltage converter 5
Is converted into a voltage signal by the OP amplifier. An A / D converter 6 is connected to the current-voltage converter 5, and outputs a digital signal value at regular intervals.

UV-A A / D converter for ultraviolet light and UV-A
The A / D converter for B ultraviolet light is connected to the arithmetic circuit 7 and multiplies each measured value by a coefficient to make the amount of ultraviolet light, for example, a value in the unit of energy (J / cm @ 2). These values are displayed on the display 8 by adding them to obtain the total amount of ultraviolet rays.

FIG. 2 is an external view of an ultraviolet ray measuring apparatus,
Is a UV-A ultraviolet light receiving window, 10 is a UV-B ultraviolet light receiving window, 11 is a display section of a measured value or the like, 12 is a display switching button, 13 is a measurement start button, and 14 is a set value input button.

Although FIG. 2 shows only a package in which necessary parts are incorporated, the actual device used includes a clothing or a human body, and a sun deck or other place where sunlight is irradiated. Incorporation into tools and instruments to be placed is possible.

Next, the operation of the ultraviolet ray measuring device will be described.

When the UV-A ultraviolet light receiving window 9 and the UV-B ultraviolet light receiving window 10 are irradiated with sunlight, the bandpass filters 1 and 2 placed in the respective light receiving windows cause the photodiode 3 to have a wavelength of 320 to 400 nm. And the voltage corresponding to the intensity is sent to the arithmetic circuit 7 as a digital value by the A / D converter 6. on the other hand,
Ultraviolet UV-B light having a wavelength of 280 to 320 nm is incident on the photodiode 4 and a voltage corresponding to the intensity is A-
The data is sent to the arithmetic circuit 7 as a digital value by the D converter 6. In the arithmetic circuit 7, the current UV-A UV amount, UV
-B (UV-A) +
The amount of (UV-B) is displayed on the display unit 11.

When the measurement start button 13 is pressed, the total amount of ultraviolet rays from the start time is displayed on the display section 11, and the set value input button 14
By inputting an allowable ultraviolet ray amount corresponding to the person in advance by using, an alarm can be issued when the received integrated ultraviolet ray amount reaches a set value.

The measurement apparatus of the present invention has been described above mainly with respect to natural sunlight. However, the measurement apparatus of the present invention is also applicable to artificial sunlight. Interpret.

[0019]

The ultraviolet measuring apparatus of the present invention is constructed as described above, and measures the UV-A ultraviolet light and the UV-B ultraviolet light individually. In addition, it became possible to perform each coping method effectively without incorrectly prescribing for the different effects on the human body.

[Brief description of the drawings]

FIG. 1 is a system block diagram of an ultraviolet ray measuring device of the present invention.

FIG. 2 is an embodiment of an external view of an ultraviolet ray measuring device of the present invention.

[Explanation of symbols]

 1, 2, band-pass filter 3, 4, photodiode 5, current-to-voltage converter 6, A / D converter 7, arithmetic circuit 8, display 9, UV-A UV receiving window 10 UV-B UV receiving window 11 Display unit 12 Display switching button 13 Measurement start button 14 Set value input button

Claims (1)

[Claims] 1. An ultraviolet ray measuring apparatus having a detection circuit for calculating the amount of received light, a calculation circuit, and a display circuit for indicating the amount of received light. An ultraviolet ray measuring device, which is divided into ultraviolet rays and receives each of them.