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    • 7. 发明授权
    • Gas laser for emitting light modulated at two different wavelengths and
an arrangement incorporating the gas laser to detect a gaseous substance
    • 用于发射以两种不同波长调制的光的气体激光器和包含气体激光器的装置以检测气态物质
    • US5544186A
    • 1996-08-06
    • US378017
    • 1995-01-25
    • Ralf-Roland SauerWolfgang RuppAlexander Hinz
    • Ralf-Roland SauerWolfgang RuppAlexander Hinz
    • G01N21/59G01J3/42G01N21/39G01N33/00H01S3/08H01S3/10H01S3/1055H01S3/223H01S3/00
    • H01S3/1055G01N21/39G01N33/0054G01J2003/423H01S3/0809H01S3/2232
    • A gas laser 1 such as a .sup.13 CO.sub.2 -laser emits at two different wavelengths (.lambda..sub.1, .lambda..sub.2) with a sine-shaped adjustment of a resonator mirror or a grating 13 such as a Littrow grating. The gas laser emits radiation at the two desired wavelengths (.lambda..sub.1, .lambda..sub.2) in two mutually adjacent intervals of the resonator length L because of a suitable dimensioning of the grating 13 with respect to grating structure and angle position, the outcoupling factor of the outcoupling mirror 12, the resonator length L and the composition of the gas of the laser. The laser emission is inhibited at the crossover between the two intervals and the sine-shaped modulation (for example with a piezo element) of the resonator length L is essentially symmetrical about this crossover. The invention is also directed to an arrangement for detecting a substance such as NH.sub.3 in a flue gas. This arrangement includes a two wavelengths laser light source 1, a modulation unit 14 and a reference detection unit D1; a transmission optic 2; a measuring path 3 which contains the substance to be detected; a receiving optic 4 and a measuring detector D2. An evaluation apparatus 5 is also provided which determines the ratio of the light absorption in the measuring path 3 at the two wavelengths (.lambda..sub.1, .lambda..sub.2) and determines therefrom the concentration of the substance to be detected in the measuring path 3.
    • 诸如13CO 2激光器的气体激光器1以谐振镜或诸如Littrow光栅的光栅13的正弦调整在两个不同波长(λ1,λ2)处发射。 由于光栅13相对于光栅结构和角度位置的合适的尺寸,气体激光器在谐振器长度L的两个相互相邻的间隔中以两个期望的波长(λ1,λ2)发射辐射, 外耦合镜12,谐振器长度L和激光器的气体的组成。 激光发射在两个间隔之间的交叉处被抑制,并且谐振器长度L的正弦调制(例如使用压电元件)基本上对称于该交叉。 本发明还涉及一种在烟道气中检测诸如NH 3的物质的装置。 这种布置包括两个波长激光光源1,调制单元14和基准检测单元D1; 传输光学器件2; 包含待检测物质的测量路径3; 接收光学器件4和测量检测器D2。 还提供了一种评估装置5,其确定测量路径3中两个波长(λ1,λ2)处的光吸收率,并由此确定测量路径3中待检测物质的浓度。