Effect of reagent ratio of graphite to potassium nitrate on reactive photoacoustic characteristics

In order to study the effect of the pharmacy ratio of graphite to potassium on the reactive photoacoustic spectrum, the dynamic photoacoustic detection technology and differential scanning calorimetry(DSC)were used for analysis. When the samples were irradiated by an Nd:YAG pulse laser (wavelength of 1.06μm, pulse width of 54μs), the greater the laser energy, the stronger the photoacoustic signal. The photoacoustic signal changed when the ratio of samples were different. The photoacoustic signal became the strongest when the ratio of the sample (3# sample) was 25/75, while the ratio was 30/70(4# sample), the photoacoustic signal was weak. After studying the time needed to achieve the photoacoustic signal peak, it found that when laser energy increased, the time first increased and then decreased. The results show that the different proportion of C and KNO3 arousing different chemical reaction. Thermal analysis results conform to the photoacoustic experimental results.