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发明公开
CN101718680A 能扣减环境噪声的光声气体检测装置及方法 失效 - 权利终止

能扣减环境噪声的光声气体检测装置及方法
摘要：
本发明公开了一种能扣减环境噪声的光声气体检测装置，以及一种利用能扣减环境噪声的光声气体检测装置检测光声气体的方法，本发明的优点是：通过在光声池外设置外微音器，用外微音器检测到的信号，校正光声池中内微音器检测到的信号中的环境噪声，增强光声气体检测的环境适应能力，提高光声气体检测的精度和可靠性；使用外微音器标定内微音器中测到的噪声信号，能消除内微音器中与光声信号同频同相的噪声信号，能有效降低外界噪声对光声气体检测仪精度的影响，既增加光声气体检测仪的环境适应能力，又有利于气体检测仪的小型化。
摘要（英）：

The invention discloses a photoacoustic gas detecting method and a photoacoustic gas detecting device capable of reducing the environmental noise. An external microphone is arranged outside a photoacoustic cell, and the signal detected by the external microphone is used for correcting the environmental noise in the signal detected by an internal microphone arranged inside the photoacoustic cell, thus the environment adapting ability of the photoacoustic gas detecting device can be strengthened, and the precision and the reliability the photoacoustic gas detecting device can be improved. The noise signal detected in the internal microphone is calibrated by the external microphone, thus the noise signal which has the same frequency and the same phase as the photoacoustic signal in the internal microphone can be eliminated, the influence of the outside noise to the precision of the photoacoustic gas detecting device can be effectively reduced, the environment adapting ability of the photoacoustic gas detecting device can be strengthened, and the photoacoustic gas detecting device can be miniaturized.

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