Measurement method of pulse laser powdery substance element based on polarization and noise reduction

The invention provides a measurement method of a pulse laser powdery substance element based on polarization and noise reduction and belongs to the field of an atom emission light spectrum. The measurement method comprises the following steps that: a powder sample is placed on a transparent glass tray; laser which passes through the glass tray from the lower side of the glass tray is focused on a powder bottom layer so as to combust a powdery substance and generate a plasma; a radiation optical signal sent by the plasma sequentially passes through the glass tray and a polaroid to be collected by a collection lens; and then, the radiation optical signal is transmitted to a spectrograph through an optical fiber to be converted into an electric signal and then the electric signal enters a computer to be analyzed. The method disclosed by the invention does not need to press and mold the powder sample and also overcomes the fluctuation of a measured signal, which is caused by that the surface of a powder layer is