CA2124508C - Ultraviolet radiation dosimeter - Google Patents
Ultraviolet radiation dosimeter Download PDFInfo
- Publication number
- CA2124508C CA2124508C CA 2124508 CA2124508A CA2124508C CA 2124508 C CA2124508 C CA 2124508C CA 2124508 CA2124508 CA 2124508 CA 2124508 A CA2124508 A CA 2124508A CA 2124508 C CA2124508 C CA 2124508C
- Authority
- CA
- Canada
- Prior art keywords
- body member
- photodetector
- photodetectors
- radiation
- ultraviolet radiation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000005855 radiation Effects 0.000 title claims abstract description 37
- 238000001228 spectrum Methods 0.000 claims abstract description 21
- 230000005670 electromagnetic radiation Effects 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 4
- 229920000728 polyester Polymers 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 3
- 230000001186 cumulative effect Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 208000000453 Skin Neoplasms Diseases 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 201000000849 skin cancer Diseases 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/429—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to measurement of ultraviolet light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0488—Optical or mechanical part supplementary adjustable parts with spectral filtering
Abstract
A personal ultraviolet radiation dosimeter compares signals from a number of photodetectors responsive to different portions of the electromagnetic spectrum to determine cumulative and instantaneous exposure to ultraviolet radiation. The method of signal comparison permits the personal dosimeter to be constructed with small and inexpensive filters.
Description
ULTRAVIOLBT R~DIATION DO~IMBTBR
FIELD OF THE lNvhN~l~lON
This invention relates to the measurement of exposure to ultraviolet ("W ") radiation. More particularly, the invention relates to an apparatus suitable for personal use.
BACKGROUND OF THE lNvhN~l~lON
The continuing depletion of the earth's protective ozone layer and the accretion of knowledge about skin cancer have raised popular concern about overexposure to sunlight. Of particular concern is the ultraviolet portion of the solar spectrum. This portion of the spectrum is further subdivided as " WA", "W B" and "W C". WA radiation (spAnn;ng the wavelengths from 320 nm to 400 nm) is not blocked by the ozone layer but is not considered a significant risk. W B radiation (spanning the wavelengths from 290 nm to 320 nm) is only partially blocked by the ozone layer and is considered dangerous. W C radiation (spAnn;ng the wavelengths from 200 nm to 290 nm) presently is essentially blocked by the ozone layer and is considered very dangerous.
Apparatus to detect ultraviolet radiation is well known but is not widely used in a consumer setting.
Contributing factors to this are the cost, size and inconvenience of such monitors. There is however, a push to develop personal W radiation dosimeters to alert individuals to overexposure to sunlight.
United States Patents 4,372,680 to Adams et al and 4,985,632 to Bianco et al disclose W radiation 2l221508 detectors that form part of wristwatches, eyeglasses, or clip-on badges. The Bianco invention measures the W
radiation directly, employing a lowpass filter to exclude all other parts of the spectrum from impinging on a single photodetector. The Adams reference uses a more indirect subtractive method whereby both W and IR
radiation impinge on a first photodetector and IR
radiation impinges on a second photodetector. By subtracting the second signal from the first, a signal corresponding to W radiation is produced. Both these inventions use heavy, expensive glass filters to restrict the portions of the spectrum impinging on the photodetectors.
lS A different use of filters is disclosed in European Patent Application 90106821.3 (Hayashi et al) and Great Britain Patent 2,245,705 (Ward et al). In these references, two photodetectors are used to implement a subtractive method. However, the complete spectrum is allowed to impinge on the first photodetector while a highpass filter restricts the radiation impinging the second photodetector to the portion of the wavelength spectrum above the selected ultraviolet region (W B). A
signal corresponding to the W radiation is created by subtracting the second signal from the first. one advantage of the highr~ss filter materials not realized by Hayashi is that they can be of light, inexpensive materials such as polyester rather than the more expensive glass. Furthermore, neither Hayashi nor Ward contemplate a credit-card-type dosimeter.
SUMMARY OF THE IN V~N'1'10N
According to the invention, there is provided an ultraviolet radiation dosimeter comprising a body 2l24~3o8 member which comprises a rectangular plastic member having the approximate size and shape of a credit card, first and second photodetectors on the body member, said photodetectors being located adjacent each other on the same side of the body member, a high pass filter operable to restrict electromagnetic radiation impinging upon the second photodetector to the portion of the spectrum above the ultraviolet wavelength range, said first and second photodetectors being electronically coupled in difference mode for registering ultraviolet radiation falling on the body member and a display on the body member for displaying the registered ultraviolet radiation.
Also according to the invention, there is provided an ultraviolet radiation dosimeter comprising a body member, first, second and third photodetectors on the body member, a first highpass filter operable to restrict electromagnetic radiation impinging upon the second photodetector to the portion of the spectrum above the W B wavelength range, a second highp~c filter operable to restrict electromagnetic radiation impinging upon the third photodetector to the portion of the spectrum above the WA wavelength range, wherein said first and second photodetectors are electronically coupled in difference mode for registering radiation in the W B wavelength range falling on the body member and said second and third photodetectors are electronically coupled in difference mode for registering radiation in the WA wavelength range falling on the body member and display means for selectively displaying a measurement of the ultraviolet radiation in the WA range and the W B
range falling on the body member.
212~508 -_ - 4 Further objects and advantages of the invention will become apparent from the description of a preferred embodiment of the invention below.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a plan view of a two-photodetector embodiment of the invention.
Figure 2 is a graph of the spectral response of a polyester highpass filter.
Figure 3 is a block diagram of the two-photodetector embodiment of Figure 1.
Figure 4 is a block diagram of a three-photodetector embodiment of the invention.
DESCRIPTION OF THE SPECIFIC EMBODIMENT
With reference to Figure 1, an ultraviolet radiation dosimeter is illustrated generally at 10. The dosimeter 10 comprises a first photodetector 11, a second photodetector 12, a highr~ss filter 13 operable to restrict electromagnetic radiation impinging upon the second photodetector 12 to the portion of the spectrum above the W B wavelength range, and a display 14 such as an LCD bargraph or digital display operable to communicate to the user dosage information. The dosimeter 10 also includes electronic circuitry (not shown) as illustrated in Figure 3 and described below.
The entire assembly is housed in a rectangular plastic housing which has the approximate size and shape of a credit card and having a thickness no greater than 3 mm and preferably about 1 mm.
212~08 _ - 5 -With reference to Figure 2, a spectral transmittance curve for a 3M polyester sheet is illustrated. A sharp rolloff point generally illustrated at lS occurs in a desirable region between the W A and W B portions of the spectrum.
With reference to Figure 3, the electronic circuitry for the dosimeter 10 is illustrated generally at 20. The circuitry comprises a first amplifier 21 operable to amplify a signal from the first photodetector 11, a second amplifier 22 operable to amplify a signal from the second photodetector 12, and a difference amplifier 23 operable to subtract the amplified signal from the second photodetector 12 from the amplified signal from the first photodetector 11. It also comprises an output amplifier 24 operable to amplify the signal from the difference amplifier 23 and a display driver 25 operable to receive the signal from the output amplifier 24 and to display corresponding information to the user via the display 14. The display driver 25 may contain circuitry to integrate the signal from the output amplifier 24 so as to provide both instantaneous and cumulative W dosage readings.
With reference now to Figure 4, the electronic portion of a three-photodetector dosimeter is illustrated generally at 40. The dosimeter 40 comprises a first photodetector 41, a second photodetector 42 and a third photodetector 43. A first highpass filter 44 is operable to restrict electromagnetic radiation impinging upon the second photodetector 42 to the portion of the spectrum above the W B wavelength range and a second highpass filter 45 is operable to restrict electromagnetic radiation impinging upon the third photodetector 43 to the portion of the spectrum above the WA wavelength 212~08 _ - 6 range. A first amplifier 50 is provided to amplify a signal from the first photodetector 41, a second amplifier 51 is provided to amplify a signal from second photodetector 42 and a third amplifier 52 is provided to amplify a signal from third photodetector 43. A first difference amplifier 53 is operable to subtract the amplified signal from the second photodetector 42 from the amplified signal from the first photodetector 41. A
second difference amplifier 54 is operable to subtract the amplified signal from the third photodetector 43 from the amplified signal from the second photodetector 41. A
battery-check terminal 55 is also provided, as well as a six-point switch, illustrated generally at 60, operable to receive at its input terminals and individually select signals from the battery-check terminal 55, the first amplifier 50, the second amplifier 51, the third amplifier 52, the first difference amplifier 53 and the second difference amplifier 54. A sixth output amplifier 61 is further provided to receive and amplify a signal selected by the six-point switch 60 and a display driver 62 is operable to receive the signal from sixth output amplifier 61 and to display corresponding information to the user via a display unit (not shown). For reasons of ease of fabrication, it is contemplated that the switch may be a solid state device, requiring a single touch-pad sensor, which accesses each of the six readings sequentially. It is also contemplated that the display driver 62 might contain circuitry to integrate the signal from sixth ou~L amplifier 61 so as to provide both instantaneous and cumulative W dosage readings.
OPERATION
In operation, the two-sensor W dosimeter 10 is placed by the user in a position wherein the 21~4508 electromagnetic radiation incident on the photodetectors 11 and 12 is representative of the radiation incident on the user. The first photodetector 11 produces a signal corresponding to the intensity of the full spectrum of 5 radiation incident upon it. The second photodetector 12 produces a signal corresponding to the intensity of the radiation incident upon it as transmitted by the highpass filter 13. The second photodetector 12 thus produces a signal corresponding to the non-WB portion of the 10 spectrum. Each photodetector signal is independently amplified respectively in the first amplifier 21 and the second amplifier 22. The difference amplifier 23 subtracts the signal from the second amplifier 22 from the signal from the first amplifier 21 to produce a 15 signal corresponding to the amount of WB radiation incident on the sensors 11 and 12. This difference signal is finally amplified in the output amplifier 24 before being received by the display driver and display unit 25 to be proc~Cce~ and communicated to the user as 20 either an instant or a cumulative dose.
The operation of the three-photodetector dosimeter 40 is essentially the same except that there is more signal information to display. By employing the 25 first difference amplifier 53, the second difference amplifier 54, and the six-point switch 60, it is possible to display information representing the instantaneous, or cumulative, (given an integrator in the display circuitry) radiation dose over the complete spectrum, the 30 spectrum below WA, the WA plus visible range, the WB
range, and the visible range. The WB reading will also include any WC contributions that the sensor can detect.
The apparatus battery level can also be displayed.
It is contemplated that even more precise radiation wavelength distribution information can be detected using even more sensors.
While several embodiments of the invention have been disclosed, many modifications may readily occur to those skilled in the art to which the invention relates.
Accordingly the embodiments should be taken as illustrative of the invention only and not as limiting its scope as construed in accordance with the accompanying claims.
While only preferred embodiments of the invention have been described herein in detail, the invention is not limited thereby and modifications can be made within the scope of the attached claims.
FIELD OF THE lNvhN~l~lON
This invention relates to the measurement of exposure to ultraviolet ("W ") radiation. More particularly, the invention relates to an apparatus suitable for personal use.
BACKGROUND OF THE lNvhN~l~lON
The continuing depletion of the earth's protective ozone layer and the accretion of knowledge about skin cancer have raised popular concern about overexposure to sunlight. Of particular concern is the ultraviolet portion of the solar spectrum. This portion of the spectrum is further subdivided as " WA", "W B" and "W C". WA radiation (spAnn;ng the wavelengths from 320 nm to 400 nm) is not blocked by the ozone layer but is not considered a significant risk. W B radiation (spanning the wavelengths from 290 nm to 320 nm) is only partially blocked by the ozone layer and is considered dangerous. W C radiation (spAnn;ng the wavelengths from 200 nm to 290 nm) presently is essentially blocked by the ozone layer and is considered very dangerous.
Apparatus to detect ultraviolet radiation is well known but is not widely used in a consumer setting.
Contributing factors to this are the cost, size and inconvenience of such monitors. There is however, a push to develop personal W radiation dosimeters to alert individuals to overexposure to sunlight.
United States Patents 4,372,680 to Adams et al and 4,985,632 to Bianco et al disclose W radiation 2l221508 detectors that form part of wristwatches, eyeglasses, or clip-on badges. The Bianco invention measures the W
radiation directly, employing a lowpass filter to exclude all other parts of the spectrum from impinging on a single photodetector. The Adams reference uses a more indirect subtractive method whereby both W and IR
radiation impinge on a first photodetector and IR
radiation impinges on a second photodetector. By subtracting the second signal from the first, a signal corresponding to W radiation is produced. Both these inventions use heavy, expensive glass filters to restrict the portions of the spectrum impinging on the photodetectors.
lS A different use of filters is disclosed in European Patent Application 90106821.3 (Hayashi et al) and Great Britain Patent 2,245,705 (Ward et al). In these references, two photodetectors are used to implement a subtractive method. However, the complete spectrum is allowed to impinge on the first photodetector while a highpass filter restricts the radiation impinging the second photodetector to the portion of the wavelength spectrum above the selected ultraviolet region (W B). A
signal corresponding to the W radiation is created by subtracting the second signal from the first. one advantage of the highr~ss filter materials not realized by Hayashi is that they can be of light, inexpensive materials such as polyester rather than the more expensive glass. Furthermore, neither Hayashi nor Ward contemplate a credit-card-type dosimeter.
SUMMARY OF THE IN V~N'1'10N
According to the invention, there is provided an ultraviolet radiation dosimeter comprising a body 2l24~3o8 member which comprises a rectangular plastic member having the approximate size and shape of a credit card, first and second photodetectors on the body member, said photodetectors being located adjacent each other on the same side of the body member, a high pass filter operable to restrict electromagnetic radiation impinging upon the second photodetector to the portion of the spectrum above the ultraviolet wavelength range, said first and second photodetectors being electronically coupled in difference mode for registering ultraviolet radiation falling on the body member and a display on the body member for displaying the registered ultraviolet radiation.
Also according to the invention, there is provided an ultraviolet radiation dosimeter comprising a body member, first, second and third photodetectors on the body member, a first highpass filter operable to restrict electromagnetic radiation impinging upon the second photodetector to the portion of the spectrum above the W B wavelength range, a second highp~c filter operable to restrict electromagnetic radiation impinging upon the third photodetector to the portion of the spectrum above the WA wavelength range, wherein said first and second photodetectors are electronically coupled in difference mode for registering radiation in the W B wavelength range falling on the body member and said second and third photodetectors are electronically coupled in difference mode for registering radiation in the WA wavelength range falling on the body member and display means for selectively displaying a measurement of the ultraviolet radiation in the WA range and the W B
range falling on the body member.
212~508 -_ - 4 Further objects and advantages of the invention will become apparent from the description of a preferred embodiment of the invention below.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a plan view of a two-photodetector embodiment of the invention.
Figure 2 is a graph of the spectral response of a polyester highpass filter.
Figure 3 is a block diagram of the two-photodetector embodiment of Figure 1.
Figure 4 is a block diagram of a three-photodetector embodiment of the invention.
DESCRIPTION OF THE SPECIFIC EMBODIMENT
With reference to Figure 1, an ultraviolet radiation dosimeter is illustrated generally at 10. The dosimeter 10 comprises a first photodetector 11, a second photodetector 12, a highr~ss filter 13 operable to restrict electromagnetic radiation impinging upon the second photodetector 12 to the portion of the spectrum above the W B wavelength range, and a display 14 such as an LCD bargraph or digital display operable to communicate to the user dosage information. The dosimeter 10 also includes electronic circuitry (not shown) as illustrated in Figure 3 and described below.
The entire assembly is housed in a rectangular plastic housing which has the approximate size and shape of a credit card and having a thickness no greater than 3 mm and preferably about 1 mm.
212~08 _ - 5 -With reference to Figure 2, a spectral transmittance curve for a 3M polyester sheet is illustrated. A sharp rolloff point generally illustrated at lS occurs in a desirable region between the W A and W B portions of the spectrum.
With reference to Figure 3, the electronic circuitry for the dosimeter 10 is illustrated generally at 20. The circuitry comprises a first amplifier 21 operable to amplify a signal from the first photodetector 11, a second amplifier 22 operable to amplify a signal from the second photodetector 12, and a difference amplifier 23 operable to subtract the amplified signal from the second photodetector 12 from the amplified signal from the first photodetector 11. It also comprises an output amplifier 24 operable to amplify the signal from the difference amplifier 23 and a display driver 25 operable to receive the signal from the output amplifier 24 and to display corresponding information to the user via the display 14. The display driver 25 may contain circuitry to integrate the signal from the output amplifier 24 so as to provide both instantaneous and cumulative W dosage readings.
With reference now to Figure 4, the electronic portion of a three-photodetector dosimeter is illustrated generally at 40. The dosimeter 40 comprises a first photodetector 41, a second photodetector 42 and a third photodetector 43. A first highpass filter 44 is operable to restrict electromagnetic radiation impinging upon the second photodetector 42 to the portion of the spectrum above the W B wavelength range and a second highpass filter 45 is operable to restrict electromagnetic radiation impinging upon the third photodetector 43 to the portion of the spectrum above the WA wavelength 212~08 _ - 6 range. A first amplifier 50 is provided to amplify a signal from the first photodetector 41, a second amplifier 51 is provided to amplify a signal from second photodetector 42 and a third amplifier 52 is provided to amplify a signal from third photodetector 43. A first difference amplifier 53 is operable to subtract the amplified signal from the second photodetector 42 from the amplified signal from the first photodetector 41. A
second difference amplifier 54 is operable to subtract the amplified signal from the third photodetector 43 from the amplified signal from the second photodetector 41. A
battery-check terminal 55 is also provided, as well as a six-point switch, illustrated generally at 60, operable to receive at its input terminals and individually select signals from the battery-check terminal 55, the first amplifier 50, the second amplifier 51, the third amplifier 52, the first difference amplifier 53 and the second difference amplifier 54. A sixth output amplifier 61 is further provided to receive and amplify a signal selected by the six-point switch 60 and a display driver 62 is operable to receive the signal from sixth output amplifier 61 and to display corresponding information to the user via a display unit (not shown). For reasons of ease of fabrication, it is contemplated that the switch may be a solid state device, requiring a single touch-pad sensor, which accesses each of the six readings sequentially. It is also contemplated that the display driver 62 might contain circuitry to integrate the signal from sixth ou~L amplifier 61 so as to provide both instantaneous and cumulative W dosage readings.
OPERATION
In operation, the two-sensor W dosimeter 10 is placed by the user in a position wherein the 21~4508 electromagnetic radiation incident on the photodetectors 11 and 12 is representative of the radiation incident on the user. The first photodetector 11 produces a signal corresponding to the intensity of the full spectrum of 5 radiation incident upon it. The second photodetector 12 produces a signal corresponding to the intensity of the radiation incident upon it as transmitted by the highpass filter 13. The second photodetector 12 thus produces a signal corresponding to the non-WB portion of the 10 spectrum. Each photodetector signal is independently amplified respectively in the first amplifier 21 and the second amplifier 22. The difference amplifier 23 subtracts the signal from the second amplifier 22 from the signal from the first amplifier 21 to produce a 15 signal corresponding to the amount of WB radiation incident on the sensors 11 and 12. This difference signal is finally amplified in the output amplifier 24 before being received by the display driver and display unit 25 to be proc~Cce~ and communicated to the user as 20 either an instant or a cumulative dose.
The operation of the three-photodetector dosimeter 40 is essentially the same except that there is more signal information to display. By employing the 25 first difference amplifier 53, the second difference amplifier 54, and the six-point switch 60, it is possible to display information representing the instantaneous, or cumulative, (given an integrator in the display circuitry) radiation dose over the complete spectrum, the 30 spectrum below WA, the WA plus visible range, the WB
range, and the visible range. The WB reading will also include any WC contributions that the sensor can detect.
The apparatus battery level can also be displayed.
It is contemplated that even more precise radiation wavelength distribution information can be detected using even more sensors.
While several embodiments of the invention have been disclosed, many modifications may readily occur to those skilled in the art to which the invention relates.
Accordingly the embodiments should be taken as illustrative of the invention only and not as limiting its scope as construed in accordance with the accompanying claims.
While only preferred embodiments of the invention have been described herein in detail, the invention is not limited thereby and modifications can be made within the scope of the attached claims.
Claims (5)
1. An ultraviolet radiation dosimeter comprising a body member which comprises a rectangular plastic member having the approximate size and shape of a credit card, first and second photodetectors on the body member, said photodetectors being located adjacent each other on the same side of the body member, a high pass filter operable to restrict electromagnetic radiation impinging upon the second photodetector to the portion of the spectrum above the ultraviolet wavelength range, said first and second photodetectors being electronically coupled in difference mode for registering ultraviolet radiation falling on the body member and a display on the body member for displaying the registered ultraviolet radiation.
2. The dosimeter according to claim 1 wherein said filter comprises a sheet of translucent plastic material covering the second photodetector.
3. The dosimeter according to claim 2 wherein said filter comprises a sheet of polyester material.
4. An ultraviolet radiation dosimeter comprising a body member, first, second and third photodetectors on the body member, a first highpass filter operable to restrict electromagnetic radiation impinging upon the second photodetector to the portion of the spectrum above the UVB wavelength range, a second highpass filter operable to restrict electromagnetic radiation impinging upon the third photodetector to the portion of the spectrum above the UVA wavelength range, wherein said first and second photodetectors are electronically coupled in difference mode for registering radiation in the UVB wavelength range falling on the body member and said second and third photodetectors are electronically coupled in difference mode for registering radiation in the UVA
wavelength range falling on the body member and display means for selectively displaying a measurement of the ultraviolet radiation in the UVA
range and the UVB range falling on the body member.
wavelength range falling on the body member and display means for selectively displaying a measurement of the ultraviolet radiation in the UVA
range and the UVB range falling on the body member.
5. The dosimeter according to claim 6, wherein said body member comprises a rectangular plastic member having the approximate size and shape of a credit card.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2124508 CA2124508C (en) | 1994-05-27 | 1994-05-27 | Ultraviolet radiation dosimeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2124508 CA2124508C (en) | 1994-05-27 | 1994-05-27 | Ultraviolet radiation dosimeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2124508A1 CA2124508A1 (en) | 1995-11-28 |
| CA2124508C true CA2124508C (en) | 2000-08-22 |
Family
ID=4153689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2124508 Expired - Fee Related CA2124508C (en) | 1994-05-27 | 1994-05-27 | Ultraviolet radiation dosimeter |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2124508C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100460839C (en) * | 2004-09-27 | 2009-02-11 | 凯鼎科技股份有限公司 | Detector for detecting ultraviolet light strength in a plurality of bands and detecting method thereof |
| IT202100004802A1 (en) | 2021-03-02 | 2022-09-02 | Imedicals S R L | DEVICE FOR THE DOSIMETRY OF UV RADIATION ABSORBED BY A USER |
-
1994
- 1994-05-27 CA CA 2124508 patent/CA2124508C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2124508A1 (en) | 1995-11-28 |
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| EEER | Examination request | ||
| MKLA | Lapsed |