Study On Human Comfort Within Low-pressure Light Environment

In everyday life,80percent of information is gained through human vision.Therefore, a comfortable lighting environment plays significant role in people’s workand life. Fortunately, recent researches have witnessed important breakthrough in therelevant fields. Nevertheless most of the related researches at home and abroad arecarried on the basis of the atmospheric environment while other environments, such asthe hypobaric environment that may lead to changes in the physiological responses(including heart rate, blood pressure, vision, etc) and psychological reaction of thehuman body are often neglected. It is conceivable that the comfortable lightenvironment in low pressure may differ from that in the atmospheric pressure. In lightof the above points, this thesis aims at studying the impact of the light environmentunder the low pressure on human body comfort. The main contents and research resultsare as follows:1. Theoretical research of how the low pressure light environment affects humancomfortThis part studies respectively the theories of the impact of low pressure and lightenvironment on human body comfort, and generalizes the human physiological andpsychological changes on this occasion. It also provides the theoretical ground for theexperimental design of the impact of low pressure light environment on human comfort.2. The experimental research of the impact of low pressure light environment onhuman comfort.To begin with, this part experiments the diverse influence levels resulted from thedifferent pressure, temperature and intensity of illumination on the human body comfort.Here the subjects are asked to fill out a questionnaire and grade the indexes of the9respective subjective feelings (feeling of brightness, feeling of the contrast degree oflight and shade, sense of color authenticity, spacious feeling, joy, clarity, sense ofrelaxation, stress and depression).The subjective evaluation indexes calculated by extenics theory indicates thathigh color temperature (color temperature of6400k) enhances a more bright, more spacious, more comfortable and joyous feeling while the low color temperature (colortemperature of3300k) brings a relaxed feeling and sense of melancholy. Regardless ofthe temperature, along with the reducing pressure, subjects exhibit increase of anxietyand decrease of visual brightness sensitivity.3. The analysis of every evaluation index and physiological index in low pressurelight environmentThrough the analysis of the questionnaire, the relationships between ninesubjective evaluation indexes and the environmental factors are derived respectively,namely, the effects of different pressure, temperature illumination on subjects’psychological feelings.The questionnaire about the subjects’ blood pressure, heart rate, vision test, as wellas tfatigue implies the physiological changes in this experimental conditions: thesubjects’ visual acuity increases with the reducing of pressure and the growth of theintensity of illumination; the subjects’ heart rate rises with the reducing pressure whileno obvious changing rule of blood pressure is denoted.