Lighting assembly and method for providing measuring light and optical measuring device
Presented herein is a lighting assembly for providing polychromatic measuring light ( 230 ) for an optical measuring device. The lighting assembly comprises an aperture component ( 202 ) comprising a first and opposite second side and at least one orifice ( 204 ), at least one pump light source ( 206 ) located on the first side of the aperture component ( 202 ) to provide pump light ( 220 ). and photoluminescent component ( 208 ) located on the second side of the aperture component ( 202 ) for converting pump light ( 220 ) receivable onto the photoluminescent component ( 208 ) from the at least one pump light source ( 206 ) into polychromatic measuring light ( 230 ). At least part of the measuring light ( 230 ) is allowed to pass the aperture component ( 202 ) through the at least one orifice ( 204 ) to provide measuring light ( 230 ) to the first side of the aperture component ( 202 ). A related method and a measuring devise using the lighting assembly are also presented.
1 . A chromatic confocal measuring device for determining one or more properties of a surface of an object, the chromatic confocal measuring device comprising a lighting assembly, which comprises:
an aperture component comprising a first and opposite second side, the aperture component defining at least one orifice;
at least one pump light source to provide pump light; and
a photoluminescent component located on the second side of the aperture component for converting pump light receivable from the first side of the aperture component through the at least one orifice to the second side of the aperture component onto the photoluminescent component from the at least one pump light source into polychromatic measuring light,
wherein part of the polychromatic measuring light is allowed to pass the aperture component through the at least one orifice to provide measuring light to the first side of the aperture component,
wherein the pump light source being located on the first side of the aperture component;
wherein the at least one orifice comprises a slit-shaped orifice or a plurality of punctiform orifices.
2 . The chromatic confocal measuring device of claim 1 , wherein the pump light and the measuring light are allowed to pass through the same at least one orifice of the aperture component.
3 . The chromatic confocal measuring device of claim 1 , wherein the material of the aperture component is transparent for the pump light and nontransparent for the measuring light.
4 . The chromatic confocal measuring device of claim 1 , wherein the second side of the aperture component is at least partially reflectable for the pump light and/or the measuring light.
5 . The chromatic confocal measuring device of claim 1 , wherein the lighting assembly further comprises a substrate component attached to a side of the photoluminescent component opposite to another side of the photoluminescent component towards the second side of the aperture component.
6 . The chromatic confocal measuring device of claim 5 , wherein the aperture component, the photoluminescent component and the substrate component are attached to each other forming a multilayer structure such that the photoluminescent component is at least partially sandwiched between the substrate component and the aperture component.
7 . The chromatic confocal measuring device of claim 1 , wherein the lighting assembly further comprises an optical connecting component disposed on the first side of the aperture component such that the pump light is inputtable via the optical connecting component to the at least one orifice.
8 . The chromatic confocal measuring device of claim 7 , wherein the optical connecting component is a beam splitter or dichroic filter, wherein the measuring light is allowed to pass through the optical connecting component.
9 . The chromatic confocal measuring device of claim 7 , wherein the optical connecting component is a mirror or optical fiber.
10 . The chromatic confocal measuring device of claim 1 , wherein the aperture component comprises a masking layer on the photoluminescent component.
11 . The chromatic confocal measuring device of claim 10 wherein the masking layer is a masking metal film layer produced by deposition.
12 . The chromatic confocal measuring device of claim 1 , the lighting assembly further comprises an optically transmissive substrate located on the first side of the aperture component, wherein the aperture component comprises a masking layer on a side of the transmissive substrate towards the photoluminescent component.
13 . The chromatic confocal measuring device of claim 12 wherein the masking layer comprises a masking metal film layer produced by deposition.
14 . The chromatic confocal measuring device of claim 1 , wherein:
the chromatic confocal measuring device comprises imaging optics;
the pump light source, a connecting component and the imaging optics are disposed in relation to the at least one orifice such that the pump light is inputtable via the connection component through the imaging optics and is focusable through the imaging optics to the at least one orifice and such that the measuring light passed through the at least one orifice is collectable by the imaging optics.
15 . A method for providing measuring light for a chromatic confocal measuring device for determining of one or more properties of a surface of an object, comprising:
directing pump light from at least one pump light source through at least one orifice onto a photoluminescent component located on a second side of an aperture component, the pump light being directed from a first side to the second side of the aperture component;
converting the pump light in the photoluminescent component into polychromatic measuring light; and
providing measuring light to the first side of the aperture component by allowing the measuring light pass the aperture component through said at least one orifice;
wherein the at least one orifice comprises a slit-shaped orifice or a plurality of punctiform orifices.