For the sake of evaluating the content of mineral oil and in water, and further more we can judge water quality pollution, we finally develop an infrared spectrometer based on STM32 which is on the basis of infrared spectrophotometry. The instrument realizes calculating the absorbance and concentration automatically with the help of high-precision pyroelectric infrared sensor and signal processing circuit. Besides it combines with built-in A/D converter and USB data transmission module, it can draw the standard curve on the host computer. Experiment results show that the instrument is accuracy enough and simple enough to use.

This paper elaborates a method to realize the single phase full bridge inverter digital controller based on DSP TMS320F28027 and gives the design scheme of both its hardware and its software. In accordance with SPWM duty ratio parameter calculated with DSP algorithm, utilizing the EPWM module on DSP, it finally attains the inverting control from direct current signal to sine wave signal. Compared with traditional method, this new method improves the output waveform effectively and shows stable performance.