scratch length according to MIL-PRF-13830 and specification of optical quality data of a filter

[Juan Reto Reynal]

Hi!

Hope you are all doing fine under this strange circumstances.

I wanted to ask you two questions.

1) If we agree that the scratch & dig specification for optical quality of a component is a visual standard comparison with a calibrated paddle (samples with scratchs with different levels of brightness (5,10,20,40,60,80) and digs with different sizes (the same numbers, but different sizes))..

I wanted to know how is that the inspector measures the length of the scratch in order to apply the following condition of the standard (link below):

3.5.2.1 Circular element. The combined length of maximum size scratches located on each surface of an optical element shall not exceed one quarter the
diameter of that element.

http://everyspec.com/MIL-PRF/MIL-PRF-010000-29999/MIL_PRF_13830B_252/

In the paddle (calibrated samples) there are not different lengths of scratches right? just different levels of brightness for each scratch number i suppose ( i don-t have any paddle in my lab)


2) Somebody gave me a filter whose optical quality specification reads as follows:

5/ 2 x 0.063 (according to MIL PRF 13830, S/D 20-10),
target value: 5/1x0.04 (according to MIL PRF 13830, S/D 10-5)

I understand that the ISO 10110 specifications on the first row, what i don-t understand is the second row, what is the target value?

Thank you very much in advance.

JRR(10).-

[Juan Reto Reynal]

For future reference, check Page 153(of the original document)

https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nbsspecialpublication746.pdf

Post by Juan Reto Reynal
Hi!
Hope you are all doing fine under this strange circumstances.
I wanted to ask you two questions.
1) If we agree that the scratch & dig specification for optical quality of a component is a visual standard comparison with a calibrated paddle (samples with scratchs with different levels of brightness (5,10,20,40,60,80) and digs with different sizes (the same numbers, but different sizes))..
3.5.2.1 Circular element. The combined length of maximum size scratches located on each surface of an optical element shall not exceed one quarter the
diameter of that element.
http://everyspec.com/MIL-PRF/MIL-PRF-010000-29999/MIL_PRF_13830B_252/
In the paddle (calibrated samples) there are not different lengths of scratches right? just different levels of brightness for each scratch number i suppose ( i don-t have any paddle in my lab)
5/ 2 x 0.063 (according to MIL PRF 13830, S/D 20-10),
target value: 5/1x0.04 (according to MIL PRF 13830, S/D 10-5)
I understand that the ISO 10110 specifications on the first row, what i don-t understand is the second row, what is the target value?
Thank you very much in advance.
JRR(10).-

[Phil Hobbs]

Post by Juan Reto Reynal
Hi!
Hope you are all doing fine under this strange circumstances.
I wanted to ask you two questions.
1) If we agree that the scratch & dig specification for optical quality of a component is a visual standard comparison with a calibrated paddle (samples with scratchs with different levels of brightness (5,10,20,40,60,80) and digs with different sizes (the same numbers, but different sizes))..
3.5.2.1 Circular element. The combined length of maximum size scratches located on each surface of an optical element shall not exceed one quarter the
diameter of that element.
http://everyspec.com/MIL-PRF/MIL-PRF-010000-29999/MIL_PRF_13830B_252/
In the paddle (calibrated samples) there are not different lengths of scratches right? just different levels of brightness for each scratch number i suppose ( i don-t have any paddle in my lab)
5/ 2 x 0.063 (according to MIL PRF 13830, S/D 20-10),
target value: 5/1x0.04 (according to MIL PRF 13830, S/D 10-5)
I understand that the ISO 10110 specifications on the first row, what i don-t understand is the second row, what is the target value?
Thank you very much in advance.
JRR(10).-

That's amazingly good for a filter. They're usually 80/50 or something
horrible like that.

I've never paid any attention to the details of the scratch/dig
standard, so I can't help with your query.

Cheers

Phil Hobbs