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    • 1. 发明授权
    • Photoacoustic sensor with mirror
    • 光声传感器带镜
    • US08848191B2
    • 2014-09-30
    • US13419827
    • 2012-03-14
    • Lisa Lust
    • Lisa Lust
    • G01N21/00
    • G01N21/17G01N2021/1704
    • A photoacoustic sensing device includes a laser tuned to emit light to cause optical absorption by a gas to be detected, a resonant acoustic sensor positioned to receive pressure waves from the gas, wherein the laser is modulated to match a resonant frequency of the resonant acoustic sensor, and a first mirror positioned to receive light from the laser after the light has passed through the gas and to reflect the received light back through the gas to cause additional optical absorption.
    • 光声感测装置包括被调谐以发射光以引起待检测气体的光吸收的激光器,定位成接收来自气体的压力波的谐振声传感器,其中激光器被调制以匹配谐振声传感器的谐振频率 以及第一反射镜,其被定位成在光已经通过气体之后接收来自激光器的光并且将接收到的光反射回通过气体以引起额外的光学吸收。
    • 3. 发明申请
    • TECHNIQUE FOR OPTICALLY PUMPING ALKALI-METAL ATOMS USING CPT RESONANCES
    • 使用CPT共振光学抽吸碱性金属成分的技术
    • US20070076776A1
    • 2007-04-05
    • US11161094
    • 2005-07-22
    • Lisa LustDouglas CarlsonDaniel Youngner
    • Lisa LustDouglas CarlsonDaniel Youngner
    • H01S3/22
    • H03L7/26G04F5/145
    • Systems and methods for optically pumping alkali-metal atoms using Coherence Population Trapping (CPT) resonances are disclosed. An illustrative push-pull optical pumping system for inducing CPT resonances in a resonance cell containing an admixture of alkali-metal atoms and one or more buffer gasses may include a laser assembly adapted to produce alternating orthogonally polarized light, and at least one DC current source adapted to output a constant-intensity carrier current signal for inducing laser emission from the laser assembly at a carrier wavelength of the alkali-metal atoms. An RF modulated signal outputted from an RF modulation source can be rectified, split, and phase-shifted for inducing a time-dependent polarization of the laser light that can be used to enhance CPT resonances. The alternating orthogonally polarized light from the laser assembly can then be used to optically pump the alkali-metal atoms within the vapor cavity, producing a dark state that can be detected with a photodetector or the like.
    • 公开了使用Coherence群体捕获(CPT)共振光学泵浦碱金属原子的系统和方法。 用于在含有碱金属原子和一种或多种缓冲气体的混合物的共振电池中诱导CPT共振的说明性推挽光泵送系统可以包括适于产生交替的正交偏振光的激光组件,以及至少一个DC电流源 适于输出恒定强度的载流子电流信号,用于在碱金属原子的载流波长下激发来自激光组件的激光发射。 可以对从RF调制源输出的RF调制信号进行整流,分频和相移,以引起可用于增强CPT谐振的激光的时间依赖极化。 然后可以使用来自激光组件的交替正交偏振光来光学地泵送蒸气腔内的碱金属原子,产生可用光电检测器等检测的暗态。
    • 5. 发明授权
    • Method and apparatus for measuring gas concentrations
    • 测量气体浓度的方法和装置
    • US08594507B2
    • 2013-11-26
    • US13162119
    • 2011-06-16
    • Daniel YoungnerLisa Lust
    • Daniel YoungnerLisa Lust
    • H04B10/00
    • G01N21/1702
    • Some embodiments are directed to a photoacoustic sensor. The photoacoustic sensor may comprise: a gas cell with an opening; a light source to generate to radiate a sample gas within the gas cell; an optical microphone to detect the sample gas within the gas cell; and a membrane aligned with the opening of the gas cell to permit sample gas to enter the gas cell. The optical microphone includes a semiconducting laser. The semiconducting laser includes a p-n junction within a cavity of the semiconducting laser. The optical microphone further includes a pressure-sensitive membrane that receives coherent light emitted from the semiconducting laser and directs reflected light back toward the semiconducting laser. During operation of the optical microphone, the pressure-sensitive membrane flexes in response to acoustic pressure waves. The phase of the reflected light is dependent upon a distance of the pressure-sensitive membrane from an aperture of the semiconducting laser.
    • 一些实施例涉及光声传感器。 光声传感器可以包括:具有开口的气室; 用于产生以在气室内辐射样气的光源; 用于检测气室内的样品气体的光学麦克风; 以及与气室的开口对准的膜,以允许样品气体进入气室。 光学麦克风包括半导体激光器。 半导体激光器包括在半导体激光器的空腔内的p-n结。 光学传声器还包括压敏膜,其接收从半导体激光器发射的相干光并将反射光引导回半导体激光器。 在光学麦克风的操作期间,压敏膜响应于声压波而弯曲。 反射光的相位取决于压敏膜与半导体激光器的孔的距离。