OPTICAL ANALYSIS SYSTEM WITH OPTICAL CONDUIT LIGHT DELIVERY
Optical analysis system and methods that may include a demultiplexing assembly with a photodetector array and a plurality of optical channels configured to prevent crosstalk therebetween. Some optical analysis system embodiments may include a multiplexer operatively coupled to a demultiplexing assembly may be used to split a single optical signal into multiple optical signals, or any other suitable purpose.
1 . An optical analysis system, comprising:
a photo detector array including a plurality of adjacent detector elements having coplanar input surfaces, active portions and inactive portions; and
a demultiplexing assembly comprising a plurality of optical channels, each optical channel including:
a channel cavity bounded by lateral baffles which are configured to optically isolate each channel cavity from all other channel cavities of said demultiplexing assembly, said channel cavity including an input end and an output end disposed opposite the input end and adjacent the photo detector array, the output end including an output aperture in optical communication with a respective active portion of the photo detector array,
a bandpass filter disposed within the channel cavity and including an input surface disposed towards the input end of the channel cavity and an output surface disposed towards the output end of the channel cavity; and
an optical conduit including an output end secured relative to the channel cavity such that an output surface of the optical conduit is directed toward and in optical communication with an input surface of the bandpass filter and the output aperture of the channel cavity.
2 . The system of claim 1 wherein each channel cavity further comprises a support baffle which is disposed over at least part of the output surface of each respective band pass filter and with the output aperture of the channel cavity being formed in the support baffle.
3 . The system of claim 1 wherein the optical conduit comprises an optical fiber.
4 . The system of claim 3 wherein the optical fiber comprises a multimode optical fiber.
5 . The system of claim 4 wherein the multimode optical fiber comprises an optical transmitting core including a transverse diameter of about 100 microns to about 1000 microns.
6 . The system of claim 1 further comprising an optical conduit mounting block disposed at the input end of the channel cavities of the demultiplexing assembly and configured to secure the optical conduits in fixed relation to the channel cavities.
7 . The system of claim 1 wherein the channel cavities and associated lateral baffles for each optical channel are formed from a unitary monolithic structure.
8 . The system of claim 1 wherein the output end of each optical conduit extends into the input boundary of the input end of the channel cavity, the input boundary of the input end of the channel cavity being defined by a plane formed by the input edges of the lateral baffles at the input end of the channel cavity.
9 . The system of claim 1 wherein the output end of each optical conduit extends within the input boundary of the input end of each respective channel cavity by a distance of about 0.5 mm to about 5 mm.
10 . The system of claim 1 further comprising an analyzer operatively coupled to output interfaces of the photodetector array for each optical channel, said analyzer being configured to receive and store optical intensity data from active portions of the photo detector array.
11 . The system of claim 1 wherein at least one detector element of each inactive portion of the photo detector array is permanently grounded so as to disable said detector element and prevent electrical crosstalk between active portions of the photo detector array.
12 . The system of claim 1 further comprising an output interface of the photodetector array for each optical channel and wherein each output interface of the photo detector array comprises a pair of electrical pins.
13 . The system of claim 1 wherein each optical channel further comprises at least one collimating lens which is disposed along a discharge axis of each optical conduit on the input side of the input surface of the respective bandpass filter.
14 . The system of claim 1 further comprising a detector window which is disposed directly adjacent an input surface of the photo detector array, the detector window being configured to seal the input surfaces of the detector elements from contamination.
15 . The system of claim 1 wherein each bandpass filter is configured to transmit a signal within a selected wavelength range.
16 . The system of claim 1 further comprising a channel housing disposed about the channel cavities and associated baffle structures and seal the channel cavities from contamination.
17 . The system of claim 1 wherein the detector elements of the photo detector array comprise a linear array of detector elements.
18 . The system of claim 1 wherein each active portion of the photo detector array comprises a single detector element.
19 . The system of claim 1 wherein each active portion of the photo detector array comprises a plurality of detector elements.
20 . The system of claim 1 wherein the demultiplexing assembly has an overall length of less than about 3 inches.
21 . The system of claim 20 wherein the demultiplexing assembly has an overall length of less than about 2 inches.
22 . The system of claim 1 wherein the photo detector array comprises about 10 detector elements to about 100 detector elements.
23 . The system of claim 1 wherein each active portion of the photo detector array is separated from adjacent active portions by a distance of less than about 1 mm.
24 . The optical analysis system of claim 1 further comprising:
a multiplexer operatively coupled to the demultiplexing assembly, the multiplexer comprising:
a multiplexer housing including a lens cavity which is disposed within the multiplexer housing;
a plurality of multiplexer output channels in optical communication with optical conduits of respective optical channels of the demultiplexing assembly;
an input multiplexer optical conduit having an output end secured relative to the lens cavity of the multiplexer housing such that an output surface of the input multiplexer optical conduit is directed toward and in optical communication with input surfaces of the optical conduits of respective multiplexer output channels; and
a lens disposed within the lens cavity, the lens being configured to direct an optical output of the input multiplexer optical conduit to each multiplexer output channel.
25 . The optical analysis system of claim 24 further comprising at least one multiplexer bandpass filter disposed within a filter cavity of the multiplexer housing, the at least one multiplexer bandpass filter having an output surface which is directed toward and in optical communication with an input surface of an optical conduit of a respective multiplexer output channel.