Method of measurement of haze in transparencies

Claim 1

A method of measuring haze of an aircraft transparency, comprising the steps of: a. illuminating a preselected test area of a surface of said aircraft transparency on the aircraft with a light source of known intensity and measuring the intensity of light back scattered from said test area to a preselected position to produce a first reading representative of the level of light scattered by said test area of said transparency; b. illuminating a standard surface area of size equal to said test area with said light source and measuring the intensity of light back scattered therefrom to said preselected position to produce a second reading representative of the level of light scattered by said standard surface; and c. calculating the ratio of said first reading to said second reading to define a quantitative measure characterizing the degree of haze of said transparency.

Claim 2

A method of measuring haze of an aircraft transparency, comprising the steps of: a. illuminating a preselected test area of a surface of said aircraft transparency on the aircraft with a light source of known intensity and measuring the intensity of light back scattered from said test area to a preselected position to produce a first reading representative of the level of light scattered by said test area of said transparency; b. illuminating a standard surface area of size equal to said test area with said light source and measuring the intensity of light back scattered therefrom to said preselected position to produce a second reading representative of the level of light scattered by said standard surface; and c. calculating the ratio of said first reading to said second reading to define a quantitative measure characterizing the degree of haze of said transparency.

Claim 7

A method of measuring haze of an aircraft transparency, comprising the steps of: a. illuminating a preselected test area of a surface of said aircraft transparency on the aircraft with a light source of know intensity and measuring the intensity of light back scattered from said test area to a preselected position to produce a first reading representative of the level of light scattered by said test area of said transparency; b. illuminating a standard surface area of size equal to said test area with said light source in a dark environment from which all other light sources have been excluded and measuring the intensity of non-specular light back scattered therefrom to said preselected position to produce a second reading representative of the level of light scattered by said standard surface; c. measuring the intensity of light back scattered to said position from said transparency with said source turned off to produce a third reading representative of the level of extraneous light scattered by said transparency test area in producing said first reading; and d. calculating the ratio of the difference between said first and third readings to said second reading to define a quantative measure of the degree of haze in said transparency.

Claim 8

A method of measuring haze of an aircraft transparency, comprising the steps of: a. illuminating a preselected test area of a surface of said aircraft transparency on the aircraft with a light source of know intensity and measuring the intensity of light back scattered from said test area to a preselected position to produce a first reading representative of the level of light scattered by said test area of said transparency; b. illuminating a standard surface area of size equal to said test area with said light source in a dark environment from which all other light sources have been excluded and measuring the intensity of non-specular light back scattered therefrom to said preselected position to produce a second reading representative of the level of light scattered by said standard surface; c. measuring the intensity of light back scattered to said position from said transparency with said source turned off to produce a third reading representative of the level of extraneous light scattered by said transparency test area in producing said first reading; and d. calculating the ratio of the difference between said first and third readings to said second reading to define a quantative measure of the degree of haze in said transparency.

Claim 10

A method of measuring haze of an aircraft transparency, comprising the steps of: a. illuminating a preselected test area of said aircraft transparency on the aircraft at one side of the transparency using a light source of known intensity; b. gathering light scattered by said test area of said transparency at one side thereof; c. sensing the level of said scattered light; d. making a first reading representative of the level of the sensed light scattered by said transparency test area at said one side thereof; e. repeating steps a. through c. utilizing a standard surface area in place of said transparency under test, wherein said standard surface is randomly scratched to a predetermined surface condition to simulate a preselected standard haze producing condition, the steps performed in a dark environment from which 11 light sources other than said light source have been excluded; f. making a second reading representative of the level of sensed light scattered by said standard surface areas at one side thereof; g. repeating steps b. and c. when said light source is turned off to sense ambient light; h. making a third reading representative of the level of sensed extraneous light scattered by said transparency test area; and i. calculating a haze index for said transparency by dividing said second reading into the difference between said first and second readings.

Claim 11

A method of measuring haze of an aircraft transparency, comprising the steps of: a. illuminating a preselected test area of said aircraft transparency on the aircraft at one side of the transparency using a light source of known intensity; b. gathering light scattered by said test area of said transparency at one side thereof; c. sensing the level of said scattered light; d. making a first reading representative of the level of the sensed light scattered by said transparency test area at said one side thereof; e. repeating steps a. through c. utilizing a standard surface area in place of said transparency under test, wherein said standard surface is randomly scratched to a predetermined surface condition to simulate a preselected standard haze producing condition, the steps performed in a dark environment from which 11 light sources other than said light source have been excluded; f. making a second reading representative of the level of sensed light scattered by said standard surface areas at one side thereof; g. repeating steps b. and c. when said light source is turned off to sense ambient light; h. making a third reading representative of the level of sensed extraneous light scattered by said transparency test area; and i. calculating a haze index for said transparency by dividing said second reading into the difference between said first and second readings.

Claim 12

A method of measuring haze of an aircraft transparency, comprising the steps of: a. illuminating a preselected test area of a surface of said aircraft transparency on the aircraft with a light source of known intensity and measuring the intensity of light back scattered from said test area to a preselected position to produce a first reading representative of the level of light scattered by said test area of said transparency; b. illuminating a standard surface area of size equal to said test area with said light source and measuring the intensity of light back scattered therefrom to said preselected position to produce a second reading representative of the level of light scattered by said standard surface; and c. calculating the ratio of said first reading to said second reading to define a quantitative measure characterizing the degree of haze of said transparency.

Claim 13

A method of measuring haze of an aircraft transparency, comprising the steps of: a. illuminating a preselected test area of a surface of said aircraft transparency on the aircraft with a light source of known intensity and measuring the intensity of light back scattered from said test area to a preselected position to produce a first reading representative of the level of light scattered by said test area of said transparency; b. illuminating a standard surface area of size equal to said test area with said light source and measuring the intensity of light back scattered therefrom to said preselected position to produce a second reading representative of the level of light scattered by said standard surface; and c. calculating the ratio of said first reading to said second reading to define a quantitative measure characterizing the degree of haze of said transparency.

Claim 14

A method of measuring haze of an aircraft transparency, comprising the steps of: a. illuminating a preselected test area of a surface of said aircraft transparency on the aricraft with a light source of known intensity and measuring the intensity of light back scattered from said test area to a preselected position to produce a first reading representative of the level of light scattered by said test area of said transparency; b. illuminating a standard surface area of size equal to said test area with said light source in a dark environment from which all other light sources have been exlcused and measuring the intensity of light back scattered therefrom to said preselected position to produce a second reading representative of the level of light scattered by said standard surface; c. measuring the intensity of non-specular light back scattered to said position from said transparency with said source turned off to produce a third reading representative of the level of extraneous light scattered by said transparency test area in producing said first reading; and d. calculating the ratio of the difference between said first and third readings to said second reading to define a quantitative measure of the degree of haze in said transparency.

Claim 15

A method of measuring haze of an aircraft transparency, comprising the steps of: a. illuminating a preselected test area of a surface of said aircraft transparency on the aricraft with a light source of known intensity and measuring the intensity of light back scattered from said test area to a preselected position to produce a first reading representative of the level of light scattered by said test area of said transparency; b. illuminating a standard surface area of size equal to said test area with said light source in a dark environment from which all other light sources have been exlcused and measuring the intensity of light back scattered therefrom to said preselected position to produce a second reading representative of the level of light scattered by said standard surface; c. measuring the intensity of non-specular light back scattered to said position from said transparency with said source turned off to produce a third reading representative of the level of extraneous light scattered by said transparency test area in producing said first reading; and d. calculating the ratio of the difference between said first and third readings to said second reading to define a quantitative measure of the degree of haze in said transparency.