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An intra-body communication (IBC) research platform based on virtual instrument was established for the hardware design of IBC transceiver. Firstly, the feasibility of constructing IBC research platform using optic- coupling circuit was verified via comparison of three kinds of measurement methods based on virtual instrument. Then, ASK, FSK and BPSK modulation-demodulation were realized via LabVIEW programming, and user interface of the platform was also designed. The platform could achieve signal transmission or recover under different coupling type, different channel distance and different modulation-demodulation method, etc., by means of dynamic adjusting of platform parameters. Experiment results of capacitive-coupling under the platform indicated the authenticity and feasibility of signal transmission. Finally, a full-floating IBC transceiver was designed aided by the parameters provided by the research platform under the scene of capacitive-coupling, FSK modulation and 180 cm channel distance. Moreover, Bit Error Rate (BER) of the transceiver was less than 1e- 5, which meant that it is effective and convenient for the design of IBC transceiver aided by virtual instrument platform.

Fluorescence immune-chromatography is a kind of immunoassay which is widely used in quantitative detection area. However, the background baseline drift with relatively large amplitude during test is a huge problem for the overall performance of the quantitative detection system, and the existing background baseline recognition and adjustment methods were based on online or offline data processing, which brings huge computational burden. To solve this problem, this paper proposed a background baseline recognition and adjustment method from the aspect of optical design. It integrated background acquisition, conditioning and control functions which could adjust the photo-electric signal of the background in real time until the sampling value of background baseline was within the threshold. Finally, the peak value of the test strip was detected. To examine the performance of the system, ten standard test strips with different concentrations were selected for background baseline detection. Besides, linearity and coefficient of variation (CV) of the system was also calculated. Results showed that the fluctuation range of baseline was within±4% of the threshold, whereas the CV of the test strip background was 2.57%. Furthermore, although the occupancy rate of background amplitude for A/D unit was decreased from 31.7% to 2.4%, CV of the system was still lower than 3%, which indicates that the system has much wider detection range than other congeneric detection devices.