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An optical sensor system (20) has an optical detector (28) with an active detector area (38) and a detector output signal (40). A test-signal optical source ( 44) has a controllable optical source (48) having an output of a wavelength detectable by the optical detector (28), and a test-signal direct

An optical sensor system (20) has an optical detector (28) with an active detector area (38) and a detector output signal (40). A test-signal optical source ( 44) has a controllable optical source (48) having an output of a wavelength detectable by the optical detector (28), and a test-signal director (50) that directs the output of the optical source (48) to the active detector area (38) of the optical detector (28). A housing (22) encloses the optical detector (28) and the test-signal optical source (44). A test instrumentation controller (52) controls the operation of the optical source (48), and receives the detector output signal ( 40) for evaluation.

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What is claimed is: 1. An optical sensor system comprising: an imaging optical detector having an active detector area and a detector output signal; a test-signal optical source comprising a controllable optical source having an output of a wavelength detectable by the optical detector, and a test-

What is claimed is: 1. An optical sensor system comprising: an imaging optical detector having an active detector area and a detector output signal; a test-signal optical source comprising a controllable optical source having an output of a wavelength detectable by the optical detector, and a test-signal director that directs the output of the optical source to the active detector area of the optical detector, wherein the test-signal director has no moving parts; a housing in which the optical detector and the test-signal optical source are enclosed; and a test instrumentation controller that controls the operation of the optical source, and receives the detector output signal for evaluation. 2. The optical sensor system of claim 1, wherein the optical source is a solid state emitter. 3. The optical sensor system of claim 1, wherein the optical source is mounted separately from the optical detector. 4. The optical sensor system of claim 1, wherein the optical source is mounted integrally with the optical detector. 5. The optical sensor system of claim 1, wherein the test-signal director comprises an optical fiber. 6. The optical sensor system of claim 1, wherein the test-signal director comprises a reflective surface disposed facing the active detector area. 7. The optical sensor system of claim 1, wherein the test-signal director comprises a reflective surface comprising a surface of a semi-transparent optical element disposed facing the active detector area. 8. The optical sensor system of claim 1, wherein the optical source is not within a field of view of the optical detector. 9. An optical sensor system comprising: an optical detector having an active detector area and a detector output signal; a test-signal optical source comprising a semi-transparent reflective surface disposed facing the active detector area, and a controllable optical source having an output of a wavelength detectable by the optical detector, wherein the optical source is positioned so that the output of the optical source is reflected by the reflective surface and to the active detector area; and a test instrumentation controller that controls the operation of the optical source, and receives the detector output signal for evaluation. 10. The optical sensor system of claim 9, wherein the optical sensor system further includes a housing in which the optical detector and the test-signal optical source are enclosed. 11. The optical sensor system of claim 9, wherein the semi-transparent reflective surface comprises a surface of a solar filter. 12. The optical sensor system of claim 9, wherein the semi-transparent reflective surface comprises a surface of an optical lens element. 13. The optical sensor system of claim 9, wherein the controllable optical source comprises a laser. 14. The optical sensor system of claim 9, wherein the controllable optical source comprises a laser or an LED, and an optical fiber that directs the output of the laser or the LED toward the semi-transparent reflective surface. 15. The optical sensor system of claim 9, wherein the test instrumentation controller comprises a modulator that modulates the output of the controllable optical source. 16. An optical sensor system comprising: an optical detector having an active detector area and a detector output signal; a test-signal optical source comprising a solar filter having a semi-transparent reflective surface disposed facing the active detector area, and a controllable optical source having an output of a wavelength detectable by the optical detector, wherein the controllable optical source comprises a light emitter, and an optical fiber that directs the output of the laser toward the semi-transparent reflective surface, and wherein the optical source is positioned so that the output of the optical source is reflected by the reflective surface and to the active detector area; a housing in which the optical detector and the test-signal optical source are enclosed; and a test instrumentation controller that controls the operation of the optical source, and receives the detector output signal for evaluation. 17. The optical sensor system of claim 16, wherein the controllable optical source comprises a laser. 18. The optical sensor system of claim 16, wherein the housing is a projectile. 19. An optical sensor system comprising: an optical detector having an active detector area and a detector output signal; a test-signal optical source comprising a controllable optical source having an output of a wavelength detectable by the optical detector, wherein the optical source is mounted integrally with the optical detector, and a test-signal director that directs the output of the optical source to the active detector area of the optical detector; a housing in which the optical detector and the test-signal optical source are enclosed; and a test instrumentation controller that controls the operation of the optical source, and receives the detector output signal for evaluation. 20. An optical sensor system comprising: an optical detector having an active detector area and a detector output signal; a test-signal optical source comprising a controllable optical source having an output of a wavelength detectable by the optical detector, and a test-signal director that directs the output of the optical source to the active detector area of the optical detector, wherein the test-signal director comprises a reflective surface disposed facing the active detector area, and wherein the test-signal director comprises an optical fiber; a housing in which the optical detector and the test-signal optical source are enclosed; and a test instrumentation controller that controls the operation of the optical source, and receives the detector output signal for evaluation. 21. The optical sensor system of claim 20, wherein the reflective surface comprises a surface of a semi-transparent optical element. 22. An optical sensor system comprising: an imaging optical detector having an active detector area and a detector output signal; a test-signal optical source comprising a controllable optical source having an output of a wavelength detectable by the optical detector, and a test-signal director that directs the output of the optical source to the active detector area of the optical detector, wherein the test-signal director comprises an optical fiber; a housing in which the optical detector and the test-signal optical source are enclosed; and a test instrumentation controller that controls the operation of the optical source, and receives the detector output signal for evaluation.