| 摘要 |
A scanning monochromator has a linear array of optical sensors 26, a secondary light source, and an optical path 27 from the light source to the sensors via either the diffraction grating 12 of the monochromator or a further grating 20 fixedly mounted with respect thereto. As the selected wavelength of the spectrum of the main emission source is altered, the diffracted light from the second light source scans across the optical sensor array 26 and thereby changes the output, so that an accurate indication of the current position of the monochromator grating 12 can be obtained. Light from the main and secondary sources passes through a slit 8, is collimated by a mirror 10, is reflected by the gratings 12 and 20 and is focussed by a mirror 16 onto an extra slit 14 and a deflecting prism 24, respectively. <IMAGE>
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