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A downhole fluid analysis tool has a tool housing and a fluid analysis device. The tool housing is deployable downhole and has at least one flow passage for a fluid sample. The fluid analysis device is disposed in the tool housing relative to the flow passage. Inside the device, one or more sources

A downhole fluid analysis tool has a tool housing and a fluid analysis device. The tool housing is deployable downhole and has at least one flow passage for a fluid sample. The fluid analysis device is disposed in the tool housing relative to the flow passage. Inside the device, one or more sources generate a combined input electromagnetic signal across a spectrum of wavelengths, and a routing assembly routes generated signals into the reference and measurement signals. At least one wheel having a plurality of filters is rotated to selectively interpose one or more of the filters in the paths of the reference and measurement signals.

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1. An apparatus deployable downhole for fluid analysis, comprising: a source generating an optical signal across a spectrum of wavelengths and routing the optical signal concurrently at a same time into a reference channel and a measurement channel;at least one movable element having a plurality of

1. An apparatus deployable downhole for fluid analysis, comprising: a source generating an optical signal across a spectrum of wavelengths and routing the optical signal concurrently at a same time into a reference channel and a measurement channel;at least one movable element having a plurality of filters distributed thereon, the filters concurrently filtering the reference and measurement channels at a same time, the at least one movable element movable to change which of the filters filter the reference and measurement channels at the same time;at least one drive operable to move the at least one movable element;control circuitry electrically coupled to the source and the at least one drive, the control circuitry controlling illumination of the source and movement of the at least one movable element; anda detection unit concurrently detecting at a same time (a) the reference channel, after interaction with one of the filters of the at least one movable element, and (b) the measurement channel, after interaction with the same filter of the at least one movable element and a fluid sample,wherein the concurrent filtering and detection of the reference and measurement channels are matched at the same time by the same filter of the at least one movable element and account for a variable condition in the apparatus. 2. The apparatus of claim 1, wherein the source comprises one or more source elements. 3. The apparatus of claim 2, wherein the one or more source elements are selected from the group consisting of a broadband source, tungsten halogen lamp, deuterium light source, short arc Xenon light source, coiled filament Infrared (thermal) emitter, arc lamp, glow bar, metal halide lamp, a light emitting diode (LED), and a super-luminescent light emitting diode (SLED). 4. The apparatus of claim 2, wherein the source comprises a beam splitter optically coupled to the one or more source elements and fractionally splitting the optical signal from the one or more source elements concurrently into the reference and measurement channels. 5. The apparatus of claim 4, wherein the beam splitter splits the optical signal into the reference channel disproportionately compared to the measurement channel. 6. The apparatus of claim 1, wherein the at least one drive comprises at least one motor coupled to the at least one movable element. 7. The apparatus of claim 1, wherein the at least one movable element comprises at least one selective orientation permitting unfiltered passage of the measurement and reference channels. 8. The apparatus of claim 1, wherein the at least one movable element comprises at least one selective orientation completely restricting passage of the measurement and reference channels. 9. The apparatus of claim 1, wherein the at least one movable element comprises a substrate having an axis of rotation, and wherein the filters comprise a plurality of filter coatings coated onto the substrate and distributed about the axis. 10. The apparatus of claim 1, wherein the at least one movable element comprises a plurality of substrates affixed together and having an axis of rotation, and wherein the filters comprises a plurality of filter coatings coated onto the substrates and distributed about the axis. 11. The apparatus of claim 1, wherein the at least one movable element comprises a disc having an axis of rotation and defining a plurality of openings distributed about the axis, and wherein the wavelength selection filters are disposed in the openings. 12. The apparatus of claim 1, wherein the at least one movable element comprises a plurality of wheels being rotatably disposed adjacent one another, each of the wheels having a plurality of filters distributed about an axis of rotation. 13. The apparatus of claim 12, wherein the at least one drive comprises a plurality of motors each separately rotating one of the wheels. 14. The apparatus of claim 12, wherein the at least one drive comprises a single motor driving a series of the wheels with different gear ratios and having the filters selectively orientatable relative to one another. 15. The apparatus of claim 1, wherein the detection unit comprises: a reference detector optically coupled to the reference channel; anda measurement detector optically coupled to the measurement channel. 16. A downhole fluid analysis tool, comprising: a tool housing deployable downhole and having a flow passage for a fluid sample; anda fluid analysis device disposed in the tool housing relative to the flow passage, the fluid analysis device at least including a source generating an optical signal across a spectrum of wavelengths and routing the optical signal concurrently at a same time into a reference channel and a measurement channel,at least one movable element having a plurality of filters distributed thereon for concurrently filtering the reference and measurement channels at a same time, the at least one movable element being movable to change which of the filters filter the reference and measurement channels at the same time,at least one drive operable to rotate the at least one movable element,control circuitry electrically coupled to the source and the drive, the control circuitry controlling illumination of the source and movement of the at least one movable element; anda detection unit concurrently detecting at a same time (a) the reference channel, after interaction with one of the filters of the at least one movable element, and (b) the measurement channel, after interaction with the same filter of the at least one movable element and a fluid sample,wherein the concurrent filtering and detection of the reference and measurement channels are matched at the same time by the same filter of the at least one movable element and account for a variable condition in the apparatus. 17. A downhole fluid analysis method, comprising: deploying a fluid analysis device downhole;obtaining a fluid sample downhole;generating an optical signal across a spectrum of wavelengths;routing the optical signal concurrently at a same time into a reference channel and a measurement channel;controlling orientation of a plurality of filters interposable in paths of the reference and measurement channels;concurrently filtering the reference and measurement channels at a same time by controlling which of the filters filter the reference and measurement channels at a same time;interacting the measurement channel with the fluid sample before or after filtering the measurement channel; andconcurrently detecting the filtered reference channel and the filtered measurement channel, the detected channels being filtered by a same one of the filters interposable in the paths of the reference and measurement channels at a same time,wherein the concurrent filtering and detection of the reference and measurement channels are matched at the same time by the same filter and account for a variable condition in the apparatus. 18. The method of claim 17, wherein generating an optical signal across a spectrum of wavelengths comprises controlling illumination of one or more sources. 19. The method of claim 17, wherein routing the optical signal into a reference channel and a measurement channel comprises fractionally splitting the optical signal into the reference and measurement channels. 20. The apparatus of claim 19, wherein fractionally splitting the optical signal into the reference and measurement channels comprises splitting the optical signal into the reference channel disproportionately compared to the measurement channel. 21. The method of claim 17, wherein controlling orientation of the filters comprises driving movement of the filters with at least one motor. 22. The method of claim 17, wherein controlling orientation of the filters comprises selectively permitting unfiltered passage of the measurement and reference channels. 23. The method of claim 17, wherein controlling orientation of the filters comprises selectively restricting passage of the measurement and reference channels. 24. The method of claim 17, wherein filtering the reference and measurement channels comprises passing the channels through at least one substrate having an axis of rotation and having a plurality of filter coatings coated onto the substrate and distributed about the axis. 25. The method of claim 17, wherein filtering the reference and measurement channels comprises passing the channels through a filter optic disposed in an opening of a rotatable disc. 26. The method of claim 17, wherein filtering the reference and measurement channels comprises passing the channels through a plurality of wheels rotatably disposed adjacent one another, each of the wheels having an axis of rotation and having the filters selectively orientatable relative to one another. 27. The method of claim 17, wherein concurrently detecting the filtered reference channel and the filtered measurement channel comprises: detecting the filtered reference channel with a reference detector optically coupled thereto; anddetecting the filtered measurement channel with a measurement detector optically coupled thereto.