| 摘要 |
PCT No. PCT/CH83/00080 Sec. 371 Date Feb. 9, 1984 Sec. 102(e) Date Feb. 9, 1984 PCT Filed Jun. 23, 1983 PCT Pub. No. WO84/00217 PCT Pub. Date Jan. 19, 1984.The device for collecting the radiation of a light source (20) within a concave mirror comprises a cylindrical or rotationally symmetrical parabolic or elliptical reflector (10'), which is covered with a curved or planar retroreflector (40) having an opening (42). The retroreflector (40) returns part of the light into the vicinity of the source (20) and brings about, due to the partial transparency of this area, that an intense, quasi-parallel light beam can be coupled out through opening (42). After passing through a monochromator element (31), this light can e.g. be supplied to a gas measuring cell (68). The optical efficiency of the device is increased by the concave mirror (57) in a shape supplementing reflector (10', 10''). The measuring signal can be determined by means of a light detector or a microphone (69). In the latter case, an acoustically decoupling gas exchange device is required, which can e.g. be realized by means of capillaries filled with the liquid (75, 75'). |
