Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1985-03-25
1987-07-21
Willis, Davis L.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356363, G01B 902
Patent
active
046814485
ABSTRACT:
A method and apparatus is disclosed for stabilizing the operative angle of acceptance of a multiple-beam interferometer means that is employed in an optical measuring system wherein optical radiation source means are employed. In accordance with the disclosed apparatus, the optical radiation source means is utilized to provide a reference point optical radiation source which emits reference optical radiation that is received by the multiple-beam interferometer means. With respect to such reference optical radiation, a set of reference non-localized multiple-beam interference fringes are created by the interferometer means. A photoelectric detection means is provided to detect the two-dimensional position of at least a portion of the innermost interference fringe of the reference set of interference fringes. Such positional information is transmitted by electrical signals to a processor means which compares such signals to desired values therefor. The desired values reflect what size said detected innermost fringe should be if the multiple-beam interferometer means is operating at a predetermined and desired angle of acceptance. If deviations from such desired values are discerned by the processor means, the processor means will transmit a control signal to the optical radiation source means. The control signal will instruct the optical radiation source means to vary the wavelength of the radiation emitted thereby so as to cause the operative angle of acceptance of the interferometer means to stabilize about the desired value therefor.
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Bhattacharyya et al. "A Method for Stabilising an Air-Spaced Fabry-Perot Etalon", J. Phys. E, vol. 10, No. 9, pp. 878-879, 9/77.
Ball Corporation
Koren Matthew W.
Willis Davis L.
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