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Technical Discussions
Michel
NDT Inspector,
consultant, Canada, Joined Sep 2006, 829

Michel

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
829
04:43 Oct-22-2007
UV Light Intensity - Labino Lamp

Many MT and Pt standards requires that UV Light intensity be 800 or 1000 micro-Watts / square centimeters minimum at the surface of the part with the light at 15 inches from the part. With the very high intensity of the Labino lamps how do people in the field measure the light intensity without exceedig the working range of their light meter? Do you increase the distance between the light and the meter and find the intensity using the inverse square law formula?


    
 
 
David
David
02:38 Oct-23-2007
Re: UV Light Intensity - Labino Lamp
Michael,
Why do you need the actual measurement? The spec says minimum, if you keep a log just enter .... above whatever is the highest range of the meter. We have a Labino lamp and had to go to metres away to get in range, makes no sense to enter that distance as you don't inspect at that distance and why bother with the calculation, you just end up with some massive number that is well above spec anyway.
Why complicate it for the guys in the field, they have enough things to worry about?

----------- Start Original Message -----------
: Many MT and Pt standards requires that UV Light intensity be 800 or 1000 micro-Watts / square centimeters minimum at the surface of the part with the light at 15 inches from the part. With the very high intensity of the Labino lamps how do people in the field measure the light intensity without exceedig the working range of their light meter? Do you increase the distance between the light and the meter and find the intensity using the inverse square law formula?
------------ End Original Message ------------




    
 
 
Michel
NDT Inspector,
consultant, Canada, Joined Sep 2006, 829

Michel

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
829
08:32 Oct-23-2007
Re: UV Light Intensity - Labino Lamp
----------- Start Original Message -----------
: Michael,
: Why do you need the actual measurement? The spec says minimum, if you keep a log just enter .... above whatever is the highest range of the meter. We have a Labino lamp and had to go to metres away to get in range, makes no sense to enter that distance as you don't inspect at that distance and why bother with the calculation, you just end up with some massive number that is well above spec anyway.
: Why complicate it for the guys in the field, they have enough things to worry about?
: : Many MT and Pt standards requires that UV Light intensity be 800 or 1000 micro-Watts / square centimeters minimum at the surface of the part with the light at 15 inches from the part. With the very high intensity of the Labino lamps how do people in the field measure the light intensity without exceedig the working range of their light meter? Do you increase the distance between the light and the meter and find the intensity using the inverse square law formula?
------------ End Original Message ------------

David,

I do agree with you. I was just curious as to what people are doing in this situation. On the other hand, auditors in the aircraft industry very seldom accept "above minimum" as a measurement of intensity. You have to be able to duplicate your results when challenged.


    
 
 
David
David
03:51 Oct-24-2007
Re: UV Light Intensity - Labino Lamp
----------- Start Original Message -----------
: : Michael,
: : Why do you need the actual measurement? The spec says minimum, if you keep a log just enter .... above whatever is the highest range of the meter. We have a Labino lamp and had to go to metres away to get in range, makes no sense to enter that distance as you don't inspect at that distance and why bother with the calculation, you just end up with some massive number that is well above spec anyway.
: : Why complicate it for the guys in the field, they have enough things to worry about?
: : : Many MT and Pt standards requires that UV Light intensity be 800 or 1000 micro-Watts / square centimeters minimum at the surface of the part with the light at 15 inches from the part. With the very high intensity of the Labino lamps how do people in the field measure the light intensity without exceedig the working range of their light meter? Do you increase the distance between the light and the meter and find the intensity using the inverse square law formula?
: David,
: I do agree with you. I was just curious as to what people are doing in this situation. On the other hand, auditors in the aircraft industry very seldom accept "above minimum" as a measurement of intensity. You have to be able to duplicate your results when challenged.
------------ End Original Message ------------

Michael,
Yes sometimes auditor check lists don't keep up with improvements in the real world. Instead of distance and calculation how about trying a grid to cut out a %age of light? if you calibrate it before hand and record the reduction in energy maybe you can bring the light back into range (15"), take a reading and apply a multiplication factor? That way you could have a reasonably easy daily check and a documented correction factor. Or maybe source a UV filter to place over the meter sensor and apply corrections that way. That way you could record actual numbers and have repeatablity.


    
 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
05:18 Oct-25-2007
Re: UV Light Intensity - Labino Lamp
Never heard of Labino lamps. If they are so powerful, do they run hot?

Any problems viewing properly-processed parts under such high intansity UV-A provided proper safety precautions are taken - such as not looking at the source, covering bare skin, not touching the lamp?


----------- Start Original Message -----------
: : : Michael,
: : : Why do you need the actual measurement? The spec says minimum, if you keep a log just enter .... above whatever is the highest range of the meter. We have a Labino lamp and had to go to metres away to get in range, makes no sense to enter that distance as you don't inspect at that distance and why bother with the calculation, you just end up with some massive number that is well above spec anyway.
: : : Why complicate it for the guys in the field, they have enough things to worry about?
: : : : Many MT and Pt standards requires that UV Light intensity be 800 or 1000 micro-Watts / square centimeters minimum at the surface of the part with the light at 15 inches from the part. With the very high intensity of the Labino lamps how do people in the field measure the light intensity without exceedig the working range of their light meter? Do you increase the distance between the light and the meter and find the intensity using the inverse square law formula?
: : David,
: : I do agree with you. I was just curious as to what people are doing in this situation. On the other hand, auditors in the aircraft industry very seldom accept "above minimum" as a measurement of intensity. You have to be able to duplicate your results when challenged.
: Michael,
: Yes sometimes auditor check lists don't keep up with improvements in the real world. Instead of distance and calculation how about trying a grid to cut out a %age of light? if you calibrate it before hand and record the reduction in energy maybe you can bring the light back into range (15"), take a reading and apply a multiplication factor? That way you could have a reasonably easy daily check and adocumented correction factor. Or maybe source a UV filter to place over the meter sensor and apply corrections that way. That way you could record actual numbers and have repeatablity.
------------ End Original Message ------------




    
 
 
Michel
NDT Inspector,
consultant, Canada, Joined Sep 2006, 829

Michel

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
829
05:37 Oct-26-2007
Re: UV Light Intensity - Labino Lamp
----------- Start Original Message -----------
: Never heard of Labino lamps. If they are so powerful, do they run hot?
: Any problems viewing properly-processed parts under such high intansity UV-A provided proper safety precautions are taken - such as not looking at the source, covering bare skin, not touching the lamp?
:
Hi Nigel,

Labino Lamp have been on the market for about 5 years now. They are fairly expensive compare to others, but worth every penny. At about 4 feet, one can have a light intensity of about 2 - 3,000 microwatts. Some standards will allow you to have 10 foot-candle of background light if your black light have such an intensity. The operator doesn't have to stand so close to the work as well. They are bulkier than other lamps, but are also well insulated. I never had the chance to work much with them, but I was impressed with what I saw. One supplier of these lamp in Ontario, Canada is Avofix in Mississauga. Call Francis Foo he'll set you up.


    
 
 
Christoph Schnitger
Christoph Schnitger
07:16 Oct-26-2007
UV Light Intensity - Labino Lamp
Hello Nigel,

we have some Labino lamps in stock ( also some used one ) ! We sold Labino lamps to the german market now for more than 8 years with a lot of sucess. Unfortunally their is a german risk classifikation so nowerdays you need special add-on glass in front. The quality, handling and working with these lamps are really good, but please have in mind that the bulb lamps is really expensive ( and after 2000 hours ) you have to buy a new one !



    
 
 

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