This paper introduces a compact data acquisition for micro spectrometer. The system uses a linear CMOS sensor to capture the spectrum, and a single STM32 ARM chip to control, to process and to transfer the signals. Compared with the traditional data acquisition system based on FPGA and ARM chips, this system has smaller size and lower cost, making it suitable for use in micro spectrometer. The performance of the system is also evaluated by a series of experiments. The system shows good linearity and accuracy. The responses under different integration time, different pixel, and different wavelength are also measured, which is important for signal correction in spectrum measurement.
This paper introduces a new portable platelet aggregation instrument based on optical transmittance measurement. The platelet-rich plasma is aggregated after adding trapping agent and leads to a transmittance enhancement. By analyzing the transmittance evolution curve, the platelet aggregation function can be obtained, which is helpful for doctors to do clinical diagnosis of thrombotic disease and make a prescription of drugs. The design of the optical module, the signal processing circuit, and the software are described in detail. After assembling the instrument, several tests of blood samples are carried out to verify its performance. The instrument is compact and easy to use, so it is potential for rapid detection or real-time monitoring.