CN101400988A - Optical transmissometer and light source and light detector for such optical transmissometer - Google Patents
Optical transmissometer and light source and light detector for such optical transmissometer Download PDFInfo
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- CN101400988A CN101400988A CNA2007800083746A CN200780008374A CN101400988A CN 101400988 A CN101400988 A CN 101400988A CN A2007800083746 A CNA2007800083746 A CN A2007800083746A CN 200780008374 A CN200780008374 A CN 200780008374A CN 101400988 A CN101400988 A CN 101400988A
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- light source
- transmissometer
- emitting diode
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
- G01N21/538—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke for determining atmospheric attenuation and visibility
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/062—LED's
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- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
A transmissometer for determining of a light beam (2) in the atmosphere is disclosed. The transmissometer comprises a light source (4) including light emitting diodes (LED) controlled by a printed circuit board, and a light detector (6) for providing output signals representing an input optical signal.
Description
The present invention relates to optical transmissometer (transmissometer) but and do not relate to remote atmospheric optics transmissometer especially uniquely.The invention still further relates to the light source and the photodetector that are used for this transmissometer.
The remote optical transmissometer of measuring the aerial decay of optical signalling is used to comprise the many application that monitor air quality and visibility and generally be divided into two classes.The first kind transmissometer that is called astronomical transmissometer is used for measuring atmospheric transmissivity, with improve some type based on the calibration of the high-energy gamma ray on ground and Cosmic ray detectors and generally comprise the gas discharge bulb light source and the charge-coupled device (CCD) detecting device.Thereby such equipment locks into bulb costliness, the power consumption height of light source and needs the frequent shortcoming that needs frequent maintenance of changing, and these two increases the manufacturing and the running cost of transmissometer significantly.If instrument is installed on remote place and needs autonomous power supply then all the more so.
The second class transmissometer that is called the environment transmissometer generally comprises incandescence bulb sources and photodiode receiver.The Narrow Field Of Vision that this class transmissometer locks into photodiode causes and is difficult to this shortcoming of various parts of alignment device correctly.In addition, the light source of this class transmissometer is usually by copped wave, and uses lock-in amplifier to come the output signal of sense photodiode, and this has also increased the manufacturing cost of device significantly.
The preferred embodiments of the present invention seek to overcome the above-mentioned deficiency of prior art.
According to an aspect of the present invention, provide a kind of light source that is used for transmissometer, this transmissometer is used for determining the decay of at least one optical signalling at fluid, and this light source comprises:
At least one light emitting diode (LED) is used to provide the output optical signalling;
Drive unit is used for described light emitting diode or each described light emitting diode energize; And
First radio communications set is used to make described light source to communicate by letter with at least one processor device and/or light detector apparatus away from described light source.
By providing the light source that comprises one or more light emitting diodes and first radio communications set that is used to make light source to communicate by letter, operation when helping light source and corresponding detector device simultaneously thereby this provides the advantage that reduces the required maintenance of light source to reduce the maintenance cost of equipment significantly with at least one processor device and/or light detector apparatus.
This light source can also comprise first intensifier means that is used to strengthen at least one described output optical signalling.
This first intensifier means can comprise at least one lens.
This drive unit can be suitable for operating off and at least one described light emitting diode.
This light source can comprise a plurality of described light emitting diode that is suitable for providing in other mean wavelength of a plurality of branches optical output signal, and wherein drive unit is suitable for operating a described light emitting diode at every turn.
This first radio communications set can be suitable for the status data of described light source is sent to light detector apparatus.
This first radio communications set can be adapted such that can remotely operate described drive unit.
According to a further aspect in the invention, provide a kind of light detector apparatus that is used for transmissometer, this transmissometer is used for determining the decay of at least one optical signalling at fluid, and this equipment comprises:
The fluorescence detector array is used to provide the corresponding output signal of representing input optical signal; And
Second radio communications set, be used to make described equipment can be used to provide at least one described input optical signal and position to communicate by letter away from least one processor device and/or the light source of described equipment.
By the light detector apparatus that comprises the fluorescence detector array and second radio communications set is provided, this provides following advantage: the detecting device that helps detector device and the source alignment that generates input optical signal and help detector device and light source is operated.
At least one described fluorescence detector can comprise charge-coupled device (CCD).
This equipment can also comprise second intensifier means that is used to strengthen at least one described input optical signal.
This second intensifier means can comprise at least one telescope.
This second radio communications set can be suitable for receiving the status data of light source.
This second radio communications set can be adapted such that can remotely operate described equipment.
This equipment can also comprise the processor device that is used to handle at least one described output signal.
This processor device can be suitable for identifying at least one the described detecting device that receives light from light source.
The electric signal that this processor device can be suitable in the future receiving since described light source a plurality of first described detecting devices of light compares with electric signal from a plurality of second detecting devices that are adjacent to described first detecting device.
This processor can be suitable for and will compare from the electric signal of a plurality of described first detecting devices and the electric signal from a plurality of described detecting devices when at least one described light emitting diode turn-offs when at least one described light emitting diode is connected.
According to another aspect of the invention, provide a kind of transmissometer of at least one optical signalling in the decay of fluid that be used for determining, this transmissometer comprises:
Light source, this light source comprise at least one light emitting diode (LED) that is used to provide the output optical signalling and are used for drive unit to described light emitting diode or each described light emitting diode energize; And light detector apparatus, this light detector apparatus comprises the fluorescence detector array that is used to provide the corresponding output signal of representing input optical signal.
By light source that comprises at least one light emitting diode and the light detector apparatus that comprises photodetector array are provided, this provides aiming between light source and the detecting device to be able to improved advantage and the transmissometer that need not lock-in amplifier is provided, and has therefore reduced the manufacturing cost of transmissometer significantly.
This light source can also comprise first intensifier means that is used at least one described output optical signalling.
This first intensifier means can comprise at least one lens.
This drive unit can be suitable for operating off and at least one described light emitting diode.
In a preferred embodiment, this light source comprises a plurality of described light emitting diode that is suitable for providing in other mean wavelength of a plurality of branches optical output signal, and this drive unit is suitable for operating a described light emitting diode at every turn.
This provides the advantage that makes it possible to use monochrome detector.
At least one described fluorescence detector can comprise charge-coupled device (CCD).
This light detector apparatus can also comprise second intensifier means that is used to strengthen at least one described input optical signal.
This second intensifier means can comprise at least one telescope.
This equipment can also comprise the processor device that is used to handle at least one described output signal.
This processor device can be suitable for identifying at least one the described detecting device that receives light from light source.
The electric signal that this processor device can be suitable in the future receiving since described light source a plurality of first described detecting devices of light compares with electric signal from a plurality of second detecting devices that are adjacent to described first detecting device.
This processor can be suitable for and will compare from the electric signal of a plurality of described first detecting devices and the electric signal from a plurality of described detecting devices when at least one described light emitting diode turn-offs when at least one described light emitting diode is connected.
This transmissometer can also comprise and is used to first radio communications set and second radio communications set that described light source can be communicated by letter with processor device and/or described detector means.
This first radio communications set can be suitable for the status data of described light source is sent to processor device and/or light detector apparatus.
This first radio communications set can be adapted such that can remotely operate described drive unit.
This second radio communications set can be suitable for receiving the status data of light source.
This second radio communications set can be adapted such that can remotely operate described equipment.
Only as an example and unrestrictedly meaning embodiments of the invention are described referring now to accompanying drawing, in the accompanying drawings:
Fig. 1 is the synoptic diagram that embodies transmissometer of the present invention;
Fig. 2 is the cross-sectional elevational view that is used in the light source in the transmissometer of Fig. 1; And
Fig. 3 is the cross-sectional elevational view that is used in the detecting device in the transmissometer of Fig. 1.
With reference to Fig. 1, a kind of definite light beam 2 that is used for using at night has light source 4 and the photodetector 6 that separates apart from d with suitable at the transmissometer of the decay of atmosphere, and this is 30 kilometers apart from d in the example of Fig. 1.
Shown in concrete among Fig. 2, light source 4 comprises two standard light emitting diodes 8 that its output is strengthened by camera lens 10, and two superbright light emitting diodes 12.Light emitting diode 8,12 is respectively about 3 ° wide and about 15 ° of wide output beams 16,18 by printed circuit board (PCB) 14 controls and emission.Light source 4 is controlled via radio modem 20, and this modulator-demodular unit is connected to antenna 24 via Surge Protector 22, and this antenna makes it possible to the mode of following stationery volume description and remotely operates light source 4 from photodetector 6.Modulator-demodular unit 20 and antenna 24 also make it possible to send to photodetector 6 status data of the light source 4 that can be used for controlling light source 4, such as the output intensity and the electric current of light source 4.The output intensity of light source is detected by the photodiode (31) in the camera cover 26 that is arranged in light source 4.
The parts of light source 4 are contained in the camera cover 26, and this camera cover has by means of well heater and mist eliminator 30 and scrubber and wiper 32 and keeps transparent window 28 clearly, wherein to scrubber and the wiper 32 supplies washing fluid 36 from jar 34.Cover 26 is fixed to telecommunication bar 70 by means of rotating base 72 and carriage (not shown).With reference to Fig. 3, photodetector 6 has shell 38, and this shell is assembled to the base 42 that is fixed in assembling post 44 via pivot 40 that uses nuts and washers 78 adjustable lengths and connecting rod 76.Newtonian telescope 46 is arranged in the shell 38 and has concave mirror 48, and this concave mirror is used for the light beam 50 of incident guided on the catoptron 52 and focuses on the charge-coupled device (CCD) camera 54 that has fluorescence detector array (not shown) as the skilled person will recognize with the light beam with incident.Control camera 54 by means of CCD phase machine controller 56; and the operation of photodetector 6 is synchronous with the operation of the light source 4 of Fig. 2 by means of radio and modulator-demodular unit 58, and this radio and modulator-demodular unit use transmission/receiving key 79 to be connected to antenna 62 by Surge Protector 60.Shell 38 also has by means of well heater and mist eliminator 66 and keeps window 64 clearly.
The operation of the transmissometer shown in the figure will be described now.
The processor (not shown) is operated light source 4 so that each light emitting diode 8,12 is luminous at different time via radio on Ethernet, serial port server 74, radio and modulator-demodular unit 58, antenna 62 and antenna 24 and the light source 4 and modulator-demodular unit 20, thereby in each light emitting diode 8,12 connection, each light emitting diode 8,12 is supplied general constant electric current to generate the output beam 16,18 of guiding receiver 6 into respectively by printed circuit board (PCB) 14. Light beam 16,18 is decayed because of the atmosphere between light source 4 and the detecting device 6, and each incident beam 50 that detecting device 6 is received focuses on the CCD camera 54 by means of mirror 48 and 52.Owing to operate each light emitting diode 8,12 discretely, CCD camera 54 need not to distinguish the light of different wave length and can be Monochrome Adapter therefore.
The processor (not shown) makes one of light emitting diode 8,12 connect earlier.Processor utilizes CCD camera 54 to carry out the exposure of following duration then, and this duration is suitable for the particular led under the average air condition.Processor identifies the image of light source 4 in the output of CCD camera then by means of the first detected algorithm of bright line bundle of 3 * 3 pixels in the visual field of camera 54.If be detected, then the picture centre of the light emitting diode of connecting is represented at the center of this wire harness.On the other hand, if processor can't detect such wire harness, then processor is connected different light emitting diodes and is repeated said process.Can improve this process by repeating this process when in first exposure process, detecting under the well-lit wire harness situation with the longer time shutter.
When processor had identified the bright line bundle of 3 * 3 pixels, it determined the brightness of the center pixel of bright line bundle.If brightness value is greater than saturation value (being the maximal value of the dynamic range of camera 54), then processor carries out the duration for exposing for the first time half exposure.On the other hand, if brightness value less than 0.8 times of saturation value, then to carry out the time shutter be saturation value and 0.9 times new exposure of the ratio of previous time shutter to processor.Till this process continues between at saturation value 0.8 times and 1.0 times of brightness value until the center pixel of the bright line bundle of 3 * 3 pixels.
The processor synthetic output intensity signal by determining the array of 20 * 20 pixels around above-mentioned 3 * 3 wire harness and center apart from this array then has the poor of the average background pixel value measured in the square annular section between 10 and 19 pixels, carries out first measurement.This provides from the intensity difference between the signal of the pixel of the image of the light emitting diode of representative connection and surrounding pixel.Processor turn-offs light emitting diode then and writes down the image of identical length of exposure and measure as first.
Finish first measure after, processor is poor at the composite signal intensity of two above-mentioned two pixel regions of image calculation.Write down measurement data then, and processor is different light emitting diode whole process repeated then.Also can improve measuring process by the two-dimensional Gaussian function that is engaged in the last stack of benchmark (pedestal).By requiring the coupling between the result of two Measurement Algorithm to improve the measurement quality.
On storage medium such as hard disk, light transmitter intensity measurements, any desired algorithm output (for example facula position) and any essential monitor data such as LED electric current, the output of LED photometry amount etc. that provided by light source are provided these data processor with data recording.Any measurement and help sign potential problems that these data can be used for becoming more meticulous and use calibration data.Monitoring data is fed to photodetector 6 via radio link from light source 4.
With the conventional light bulb contrast,, realized more stable and more long-life light source by using the superbright LED in the light source 4.In addition, by once switching a light emitting diode 8,12, can wavelength of one-shot measurement, thus therefore can use monochromatic CCD camera 54 to reduce the cost of devices.In addition, the use of light emitting diode makes it possible to obtain at the suitably uniform light beam of wide angle, and this light beam can be by the CCD phase machine testing with wider field of view, and this has been avoided the alignment issues of prior art equipment.In addition, the use to photodiode has been avoided in the use of CCD camera 54, and this makes it possible to be avoided to use copped wave and lock-in amplifier again, has therefore reduced the cost of equipment.
Can also be by be provided for providing the blank screen formula structure of suitable background to improve the operation of this equipment in light source 4 back for the Flame Image Process of CCD camera 54.
Those skilled in the art will recognize that it is possible only not described the foregoing description and various change as an example with having any limited significance and being modified under the situation that does not break away from the scope of the invention that limits as claims.For example, though the embodiment that describes referring to figs. 1 through Fig. 3 mainly is suitable for using night, those skilled in the art will recognize that if carry out the suitable modification of present device then this equipment also can operated in the daytime.In addition, except between the processor of light source 4 and photodetector 6, directly providing the Radio Link, those skilled in the art will recognize that can arrange also that Radio Link makes remotely operates light source 4 and photodetector 6 by means of Radio Link.
Claims (34)
1. light source that is used for transmissometer, described transmissometer are used for determining the decay of at least one optical signalling at fluid, and described light source comprises:
At least one light emitting diode (LED) is used to provide the output optical signalling;
Drive unit is used for described light emitting diode or each described light emitting diode energize; And
First radio communications set is used to make described light source to communicate by letter with at least one processor device and/or light detector apparatus away from described light source.
2. light source according to claim 1 also comprises first intensifier means that is used to strengthen at least one described output optical signalling.
3. light source according to claim 2, wherein said first intensifier means comprises at least one lens.
4. according to the described light source of arbitrary aforementioned claim, wherein said drive unit is suitable for operating off and at least one described light emitting diode.
5. light source according to claim 4 comprises a plurality of described light emitting diode that is suitable for providing in other mean wavelength of a plurality of branches optical output signal, and wherein said drive unit is suitable for described light emitting diode of single job.
6. according to the described light source of arbitrary aforementioned claim, wherein said first radio communications set is suitable for the status data of described light source is sent to processor device and/or light detector apparatus.
7. according to the described light source of arbitrary aforementioned claim, wherein said first radio communications set is adapted such that can remotely operate described drive unit.
8. light detector apparatus that is used for transmissometer, described transmissometer are used for determining the decay of at least one optical signalling at fluid, and described equipment comprises:
The fluorescence detector array is used to provide the corresponding output signal of representing input optical signal; And
Second radio communications set, be used to make described equipment can be used to provide at least one described input optical signal and position to communicate by letter away from least one processor device and/or the light source of described equipment.
9. equipment according to claim 8, wherein at least one described fluorescence detector comprises charge-coupled device (CCD).
10. according to Claim 8 or 9 described equipment, also comprise second intensifier means that is used to strengthen at least one described input optical signal.
11. equipment according to claim 10, wherein said second intensifier means comprises at least one telescope.
12. the described equipment of arbitrary claim in 11 according to Claim 8, wherein said second radio communications set is suitable for receiving the status data of light source.
13. the described equipment of arbitrary claim in 12 according to Claim 8, wherein said second radio communications set is adapted such that can remotely operate described equipment.
14. the described equipment of arbitrary claim in 13 also comprises the processor device that is used to handle at least one described output signal according to Claim 8.
15. equipment according to claim 14, wherein said processor device are suitable for identifying at least one the described detecting device that receives light from light source.
16. being suitable in the future receiving since described light source the electric signal of a plurality of first described detecting devices of light, equipment according to claim 15, wherein said processor device compares with electric signal from a plurality of second detecting devices that are adjacent to described first detecting device.
17. equipment according to claim 16, wherein said processor are suitable for and will compare from the electric signal of a plurality of described first detecting devices and the electric signal from a plurality of described detecting devices when at least one described light emitting diode turn-offs when at least one described light emitting diode is connected.
18. one kind is used for determining the transmissometer of at least one optical signalling in the decay of fluid, described transmissometer comprises:
Light source, described light source comprise at least one light emitting diode (LED) that is used to provide the output optical signalling and are used for drive unit to described light emitting diode or each described light emitting diode energize; And
Light detector apparatus, described light detector apparatus comprise the fluorescence detector array that is used to provide the corresponding output signal of representing input optical signal.
19. transmissometer according to claim 18, wherein said light source also comprise first intensifier means that is used to strengthen at least one described output optical signalling.
20. transmissometer according to claim 19, wherein said first intensifier means comprises at least one lens.
21. according to the described transmissometer of arbitrary claim in the claim 18 to 20, wherein said drive unit is suitable for operating off and at least one described light emitting diode.
22. according to the described transmissometer of arbitrary claim in the claim 18 to 21, wherein said light source comprises a plurality of described light emitting diode that is suitable for providing in other mean wavelength of a plurality of branches optical output signal, and described drive unit is suitable for described light emitting diode of single job.
23. according to the described transmissometer of arbitrary claim in the claim 18 to 22, wherein at least one described fluorescence detector comprises charge-coupled device (CCD).
24. according to the described transmissometer of arbitrary claim in the claim 18 to 23, wherein said light detector apparatus also comprises second intensifier means that is used to strengthen at least one described input optical signal.
25. transmissometer according to claim 24, wherein said second intensifier means comprises at least one telescope.
26. according to the described transmissometer of arbitrary claim in the claim 18 to 25, wherein said light detector apparatus also comprises the processor device that is used to handle at least one described output signal.
27. transmissometer according to claim 26, wherein said processor device are suitable for identifying at least one the described detecting device that receives light from light source.
28. being suitable in the future receiving since described light source the electric signal of a plurality of first described detecting devices of light, transmissometer according to claim 27, wherein said processor device compare with electric signal from a plurality of second detecting devices that are adjacent to described first detecting device.
29. transmissometer according to claim 28, wherein said processor are suitable for and will compare from the electric signal of a plurality of described first detecting devices and the electric signal from a plurality of described detecting devices when at least one described light emitting diode turn-offs when at least one described light emitting diode is connected.
30., also comprise being used to first radio communications set and second radio communications set that described light source can be communicated by letter with processor device and/or described detector device according to the described transmissometer of arbitrary claim in the claim 18 to 29.
31. transmissometer according to claim 30, wherein said first radio communications set are suitable for the status data of described light source is sent to processor device and/or light detector apparatus.
32. according to claim 30 or 31 described transmissometers, wherein said first radio communications set is adapted such that can remotely operate described drive unit.
33. according to the described transmissometer of arbitrary claim in the claim 30 to 32, wherein said second radio communications set is suitable for receiving the status data of light source.
34. according to the described transmissometer of arbitrary claim in the claim 30 to 33, wherein said second radio communications set is adapted such that can remotely operate described equipment.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0604990A GB0604990D0 (en) | 2006-03-11 | 2006-03-11 | Optical transmissometer and light source and light detector for such optical transmissometer |
| GB0604990.2 | 2006-03-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101400988A true CN101400988A (en) | 2009-04-01 |
Family
ID=36241489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007800083746A Pending CN101400988A (en) | 2006-03-11 | 2007-03-07 | Optical transmissometer and light source and light detector for such optical transmissometer |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN101400988A (en) |
| GB (1) | GB0604990D0 (en) |
| WO (1) | WO2007104925A2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008006146B4 (en) * | 2008-01-26 | 2009-12-10 | Sick Maihak Gmbh | Visual haze measurement in a surveillance area |
| EP2487480B1 (en) * | 2011-02-09 | 2014-01-15 | ABB Technology AG | Optical sensor element and optical sample analysing apparatus |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6269147A (en) * | 1985-09-20 | 1987-03-30 | Nichibei Denshi Kk | Measuring method for visibility |
| US5771484A (en) * | 1996-02-28 | 1998-06-23 | Sun Microsystems, Inc. | Automated positive control traffic system for weather |
| FR2745915B1 (en) * | 1996-03-07 | 1998-04-30 | Com 1 | FOG DETECTOR |
| GB9702018D0 (en) * | 1997-01-31 | 1997-03-19 | Univ London | Determination of the ratio of optical absorbtion coefficients at different wavelengths in a scattering medium |
| US6853453B2 (en) * | 1999-03-12 | 2005-02-08 | Regents Of The University Of Minnesota | Video camera-based visibility measurement system |
| AUPR813101A0 (en) * | 2001-10-08 | 2001-11-01 | Almos Systems Pty Ltd | Improvements in transmissometers |
| DE102004006961B3 (en) * | 2004-02-09 | 2005-08-11 | Vaisala Gmbh | Apparatus and method for measuring the atmospheric transmission and determining the meteorological visibility |
| EP1596185B1 (en) * | 2004-05-10 | 2006-12-27 | C.R.F. Società Consortile per Azioni | Visibility measuring system and method |
-
2006
- 2006-03-11 GB GB0604990A patent/GB0604990D0/en not_active Ceased
-
2007
- 2007-03-07 CN CNA2007800083746A patent/CN101400988A/en active Pending
- 2007-03-07 WO PCT/GB2007/000796 patent/WO2007104925A2/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2007104925A2 (en) | 2007-09-20 |
| GB0604990D0 (en) | 2006-04-19 |
| WO2007104925A3 (en) | 2007-12-06 |
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Open date: 20090401 |