An improved Boltzmann plot method where the intensity is taken as the integral of the experimental spectrum within a special band for a cluster of a rotational line of R and Q branches is proposed.This method aims at ...An improved Boltzmann plot method where the intensity is taken as the integral of the experimental spectrum within a special band for a cluster of a rotational line of R and Q branches is proposed.This method aims at deducing rotational and vibrational temperatures using CH radical A^(2)Δ→X^(2)Πband emission spectroscopy accurately.In addition,the data relative to the rotation lines of CH(A^(2)Δ→X^(2)Π)for both temperatures are assembled.The emission spectrum of CH(A^(2)Δ→X^(2)Π)at the inner cone of an acetylene-oxygen flame in a rich oxygen state is recorded and both of the temperatures are determined by the above-mentioned method.The values are recorded as 3141 K and 3097 K,for the rotational and vibrational temperatures,respectively.This result reveals that the equilibrium between the rotation and vibration states is achieved.A simple discussion for this method is also provided.展开更多
The aim is to resolve the difficulties of measurement of temperature at several thousands of Celsius degrees for some unstable non-equilibrium gas flows.Based on the molecular spectroscopy theory and inherent molecula...The aim is to resolve the difficulties of measurement of temperature at several thousands of Celsius degrees for some unstable non-equilibrium gas flows.Based on the molecular spectroscopy theory and inherent molecular structure characteristics of the CN radical,the dependence of the spectral profile on the rotational temperature(RT),vibrational temperature(VT)and optical apparatus function are numerically explored within some certain ranges.Meanwhile,by comparing the numerically calculated spectra with the experimental spectra of the CN radical,the corresponding RT and VT of the plasma induced by the interaction of the laser pulse from an oscillated Nd:YAG laser with the coal target are determined,respectively.In addition,a short discussion on the thermodynamic state and the energy transfer process of the CN radical is also given.展开更多
we present an analysis for the alternating linear polarization(ALP)state in a multi-longitudinal-mode laser with external modulation,and propose a new method for detecting this state.In a neodymium-doped fiber laser w...we present an analysis for the alternating linear polarization(ALP)state in a multi-longitudinal-mode laser with external modulation,and propose a new method for detecting this state.In a neodymium-doped fiber laser with a modulated pump,the ALP state is experimentally observed at both periodic and chaotic oscillation.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 10472123.
文摘An improved Boltzmann plot method where the intensity is taken as the integral of the experimental spectrum within a special band for a cluster of a rotational line of R and Q branches is proposed.This method aims at deducing rotational and vibrational temperatures using CH radical A^(2)Δ→X^(2)Πband emission spectroscopy accurately.In addition,the data relative to the rotation lines of CH(A^(2)Δ→X^(2)Π)for both temperatures are assembled.The emission spectrum of CH(A^(2)Δ→X^(2)Π)at the inner cone of an acetylene-oxygen flame in a rich oxygen state is recorded and both of the temperatures are determined by the above-mentioned method.The values are recorded as 3141 K and 3097 K,for the rotational and vibrational temperatures,respectively.This result reveals that the equilibrium between the rotation and vibration states is achieved.A simple discussion for this method is also provided.
文摘The aim is to resolve the difficulties of measurement of temperature at several thousands of Celsius degrees for some unstable non-equilibrium gas flows.Based on the molecular spectroscopy theory and inherent molecular structure characteristics of the CN radical,the dependence of the spectral profile on the rotational temperature(RT),vibrational temperature(VT)and optical apparatus function are numerically explored within some certain ranges.Meanwhile,by comparing the numerically calculated spectra with the experimental spectra of the CN radical,the corresponding RT and VT of the plasma induced by the interaction of the laser pulse from an oscillated Nd:YAG laser with the coal target are determined,respectively.In addition,a short discussion on the thermodynamic state and the energy transfer process of the CN radical is also given.
基金Supported by the National Natural Science Foundation of ChinaNonlinear Science Project of China
文摘we present an analysis for the alternating linear polarization(ALP)state in a multi-longitudinal-mode laser with external modulation,and propose a new method for detecting this state.In a neodymium-doped fiber laser with a modulated pump,the ALP state is experimentally observed at both periodic and chaotic oscillation.
