Method of correlation spectroscopy utilizing an asymmetric double pass grating monochromator

Claim 2

In the performance of correlation spectroscopy utilizing a zero dispersion monochromator that includes entrance, intermediate and exit slits, a ruled grating in the beam path between thE entrance and exit slits and operable to disperse a beam of radiation incident thereon both prior and subsequent to radiation passage through the intermediate slit, means to rotate the grating about a first axis which is parallel to the grating rulings, the entrance and exit slits symmetrically disposed at opposite sides of a plane bisecting and normal to a line extending between the entrance and exit slits, the plane also passing through the intermediate slit, the steps that include a. locating said axis to have intersection with and to extend at an angle Psi relative to a normal to said plane that passes through said intersection, thereby to substantially eliminate spectral overlap, b. locating an array of sets of slits adjacent the intermediate slit position of the monochromator, and c. effecting successive location of the slits in the array into the focal plane of said intermediate slit position.

Claim 3

In the performance of correlation spectroscopy utilizing a zero dispersion monochromator having entrance, intermediate and exit slits, a ruled grating in the beam path between the entrance and exit slits and operable to disperse a beam of radiation incident thereon both prior and subsequent to radiation passage through the intermediate slit, means to rotate the grating about a first axis which is parallel to the grating rulings, the entrance and exit slits symmetrically disposed at opposite sides of a plane bisecting and normal to a line extending between the entrance and exit slits, the plane also passing through the intermediate slit, the steps that include a. locating said axis to have intersection with and to extend at an angle Psi relative to a normal to said plane that passes through said intersection, thereby to substantially eliminate spectral overlap, said angle having the approximate value arc sin (S/R) where S one-half the length of said line extending between the entrance and exit slits, and R the distance between said intersection and the center of either of the entrance and exit slits b. providing a set of apertures for isolating multiple lines or bands of substances to be analysed, and c. locating said set at the locus of said intermediate slit.

Claim 4

In the performance of correlation spectroscopy utilizing a zero dispersion monochromator having entrance, intermediate and exit slits, a ruled grating in the beam path between the entrance and exit slits and operable to disperse a beam of radiation incident thereon both prior and subsequent to radiation passage through the intermediate slit, means to rotate the grating about a first axis which is parallel to the grating rulings, the entrance and exit slits symmetrically disposed at opposite sides of a plane bisecting and normal to a line extending between the entrance and exit slits, the plane also passing through the intermediate slit, the steps that include a. locating said axis to have intersection with and to extend at an angle Psi relative to a normal to said plane that passes through said intersection, thereby to substantially eliminate spectral overlap, said angle having the approximate value arc sin (S/R) where S one-half the length of said line extending between the entrance and exit slits, and R the distance between said intersection and the center of either of the entrance and exit slits b. providing a set of apertures for isolating multiple lines or bands of substances to be analysed, and c. locating said set at the locus of said intermediate slit.

Claim 5

In the performance of correlation spectroscopy using an asymmetric, double pass, grating monochromator, the steps that include a. providing entrance, intermediate and exit slits to define successive sections of the monochromator, b. locating the grating in the beam path between the entrance and exit slits and operable to disperse a beam of radiation incident thereon both prior and subsequent to radiation passage through the intermediate slit, the grating having rulings, c. providing means to rotate the grating about a first axis which is parallel to the grating rulings, d. the entrance and exit slits symmetrically disposed at opposite sides of a plane bisecting and normal to a line extending between the entrance and exit slits, said plane also passing through the intermediate slit, e. locating said axis to have intersection with said plane and to extend at an angle Psi relative to a normal to said plane that passes through said intersection, the angle characterized in that spectral overlap is substantially eliminated and defined as having the approximate value arc sin (S/R) where S one-half the length of said line extending between the entrance and exit slits, and R the distance between said intersection and the center of either of the entrance and exit slits, f. providing a set of apertures for isolating multiple lines or bands of substances to be analysed, and g. locating said set at the locus of said intermediate slit to define said slit.

Claim 6

In the performance of correlation spectroscopy using an asymmetric, double pass, grating monochromator, the steps that include a. providing entrance, intermediate and exit slits to define successive sections of the monochromator, b. locating the grating in the beam path between the entrance and exit slits and operable to disperse a beam of radiation incident thereon both prior and subsequent to radiation passage through the intermediate slit, the grating having rulings, c. providing means to rotate the grating about a first axis which is parallel to the grating rulings, d. the entrance and exit slits symmetrically disposed at opposite sides of a plane bisecting and normal to a line extending between the entrance and exit slits, said plane also passing through the intermediate slit, e. locating said axis to have intersection with said plane and to extend at an angle Psi relative to a normal to said plane that passes through said intersection, the angle characterized in that spectral overlap is substantially eliminated and defined as having the approximate value arc sin (S/R) where S one-half the length of said line extending between the entrance and exit slits, and R the distance between said intersection and the center of either of the entrance and exit slits, f. providing a set of apertures for isolating multiple lines or bands of substances to be analysed, and g. locating said set at the locus of said intermediate slit to define said slit.