interference fringe type might be work.
On May 9, 2015, at 4:16 AM, Lee Hitchens wrote:

> Thanks Louis
>
> I think the issue is the transulence of the coating. I think the
> measurement is done on glass slides for parylene. However,  
> difficulties
> appear to occur with unclear coatings such as silicones.
>
> However, I will pursue this and check.
>
> Best Regards
>
> Dr Lee Hitchens
>
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> On 08/05/15 18:41, "Louis Hart" <[log in to unmask]> wrote:
>
>> Lee, it has been more than 15 years, but I measured synthetic diamond
>> coatings, with thickness a fraction of what I expect conformal  
>> coating
>> should be, on metals with an ellipsometer and an instrument called a
>> 'Nanospec'. The ellipsometer was more accurate, as it measured the
>> material property (dielectric permittivity, I think it was) of the
>> specimen then used that to determine coating thickness.  The  
>> nanospec, if
>> my memory is correct, had a catalogue of material parameters from  
>> which
>> you called up yours and got a thickness in one observational step.
>>
>> Both used a laser, again if my memory is correct.  The area of  
>> coating
>> being measured was a tiny spot, much smaller than any dimension of a
>> component leg I know of.  Louis
>>
>>
>>
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Lee Hitchens
>> Sent: Thursday, May 07, 2015 3:50 AM
>> To: [log in to unmask]
>> Subject: [TN] Conformal Coating Thickness Measurement on legs of
>> components
>>
>> Hi all
>>
>> I am being asked regularly now on options for measuring coating  
>> thickness
>> on legs. I am trying to determine if there is actually a practical
>> solution?
>> Cost is less important compared to being a workable relatively quick
>> process?
>>
>> One thing that could be an issue is many times its a silicone  
>> coating and
>> this tends to be less than clear optically. Some systems need clear
>> coatings to be successful.
>>
>> Has anyone had any success with this?
>>
>> Best Regards
>>
>> Dr Lee Hitchens
>>
>> SCH Technologies is a Division of SCH Services Limited
>>
>> Mob: +44 (0) 7862 25 33 21
>>
>> www.conformalcoating.co.uk <http://www.conformalcoating.co.uk/>
>>
>>
>>
>>
>>
>>
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