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  • scratch length according to MIL-PRF-13830 and specification of optical

    From Juan Reto Reynal@21:1/5 to All on Sun Apr 5 05:36:01 2020
    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).-

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  • From Juan Reto Reynal@21:1/5 to All on Sun Apr 5 06:18:38 2020
    For future reference, check Page 153(of the original document)

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


    El domingo, 5 de abril de 2020, 9:36:02 (UTC-3), Juan Reto Reynal escribió:
    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).-

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  • From Phil Hobbs@21:1/5 to Juan Reto Reynal on Sun Apr 5 11:09:36 2020
    On 2020-04-05 08:36, Juan Reto Reynal wrote:
    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).-


    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

    --
    Dr Philip C D Hobbs
    Principal Consultant
    ElectroOptical Innovations LLC / Hobbs ElectroOptics
    Optics, Electro-optics, Photonics, Analog Electronics
    Briarcliff Manor NY 10510

    http://electrooptical.net
    http://hobbs-eo.com

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