| Research on stress has attracted attention of more and more disciplines in recent decades, and stress takes an important role in the development of many diseases. In high risk occupations, workers are usually under more stress, when in the case of an emergency, high level of stress may cause workers unable to make correct responses in time, thus leading to catastrophic accidents.Backgrounds of relevant researches, and the importance and necessity of evaluating stress, especially in high risk occupations, are introduced in this paper; Existing stress evaluating methods and the short-comings of them are presented. To overcome the shortcomings, in this paper, we proposed a novel stress detection method, which is through studying physiological parameters change.By theoretical analysis and referring to relevant researches, skin temperature, pulse, and skin conductance were selected as the target physiological parameters. And a portable stress detection system was developed to sample, process and analyze the physiological parameters, and our verification tests confirmed that the system achieved desired functionality.Using electrical stimulation as the stressor, we designed proper experiments to simulate the stress-coping process. We analyzed physiological parameters change under stress, and results showed that the stress evaluating method proposed in this paper was feasible. Compared with traditional stress evaluating methods, the method proposed in this paper is non-invasive, convenient to use and can get the result in a short time.Repetitive stimulation experiment was designed and carried out to study how the GSR latency changes in a stimulation series, and the results provided reference for judging when the subject received a stimulus.In the end, we designed flight simulation experiment, and the results proved that, the stress detection system could not only be used in environment-controlled laboratory, but also in high risk occasions such as pilots and racers. |
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