Piezoelectric-tuned microwave cavity for absorption spectrometry
    1.
    发明授权
    Piezoelectric-tuned microwave cavity for absorption spectrometry 失效
    用于吸收光谱的压电调谐微波腔

    公开(公告)号:US4110686A

    公开(公告)日:1978-08-29

    申请号:US825503

    申请日:1977-08-17

    IPC分类号: G01N24/00 G01R27/04

    CPC分类号: G01N24/008 G01R27/04

    摘要: Gas samples are analyzed for pollutants in a microwave cavity that is provided with two highly polished walls. One wall of the cavity is mechanically driven with a piezoelectric transducer at a low frequency to tune the cavity over a band of microwave frequencies in synchronism with frequency modulated microwave energy applied to the cavity. Absorption of microwave energy over the tuned frequencies is detected, and energy absorption at a particular microwave frequency is an indication of a particular pollutant in the gas sample.

    摘要翻译: 分析气体样品中的微波空腔中有两个高度抛光的墙壁上的污染物。 空腔的一个壁用低频率的压电换能器机械驱动,以与施加到空腔的调频微波能量同步地在微波频带上调谐空腔。 检测到在调谐频率上的微波能量的吸收,并且特定微波频率处的能量吸收是气体样品中特定污染物的指示。

    140 GHz pulsed fourier transform microwave spectrometer
    2.
    发明授权
    140 GHz pulsed fourier transform microwave spectrometer 失效
    140 GHz脉冲傅立叶变换微波光谱仪

    公开(公告)号:US4703273A

    公开(公告)日:1987-10-27

    申请号:US759783

    申请日:1985-07-29

    IPC分类号: G01N22/00 G01R33/60 G01N27/78

    CPC分类号: G01R33/60 G01N22/00

    摘要: A high frequency energy pulsing system suitable for use in a pulsed microwave spectrometer (10), including means (11, 19) for generating a high frequency carrier signal, and means (12) for generating a low frequency modulating signal. The carrier signal is continuously fed to a modulator (20) and the modulating signal is fed through a pulse switch (23) to the modulator. When the pulse switch (23) is on, the modulator (20) will produce sideband signals above and below the carrier signal frequency. A frequency-responsive device (31) is tuned to one of the sideband signals and away from the carrier frequency so that the high frequency energization of the frequency-responsive device (31) is controlled by the pulse switch (23).

    摘要翻译: 一种适用于脉冲式微波光谱仪(10)的高频能量脉冲系统,包括用于产生高频载波信号的装置(11,19),以及用于产生低频调制信号的装置(12)。 载波信号被连续馈送到调制器(20),并且调制信号通过脉冲开关(23)馈送到调制器。 当脉冲开关(23)接通时,调制器(20)将产生高于和低于载波信号频率的边带信号。 频率响应装置(31)被调谐到边带信号中的一个并且远离载波频率,使得频率响应装置(31)的高频通电由脉冲开关(23)控制。