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Photoacoustic (PA) spectrum is a promising method in SF6 decomposition product detection. To develop an on-line monitoring device, a gas detection system based on PA effect was introduced. Three kinds of gases, SO2, CO2, and CF4, were chosen to test the device performance. Some experiments were conducted to get the relationship of PA signal and gas concentration. The minimum detection limit of each...
In this paper, a non-invasive oil temperature measurement instrument, together with the oil temperature calculation model based on the pipe surface and ambient temperatures, is presented. In order to validate the model, a verification device was developed which can measure the oil, pipe surface and ambient temperatures simultaneously. A series of model verification and optimization tests under different...
The purpose of this study is to investigate the effect of green roof on urban ecological environment and indoor environment for green buildings. The human settlement and indoor environment of green buildings and common buildings were evaluated based on green building assessment system. Results show that green roof could directly weaken the urban heat island effect and greenhouse gases. The temperature...
An assessment of thermal environment and indoor air quality (IAQ) in a lagre art gallery, which is mechannically ventilated, is presented. Measurements of indoor environmental parameters, CO2, formaldehyde, NH3, Randon, and TVOC concentrations were performed, while the comprehensive air quality evaluation index was calculated to describe the employees's feeling of discomfort and indoor air classification...
Considering the subsystems and parts in hydraulic system of large weapon equipment being scattered, together with the strong pertinence among them, a state monitoring scheme based on wireless sensor network (WSN) is adopted, which can not only eliminate a large number of cables, but also make the state monitoring system simple and convenient for carrying and installing. Taking advantage of optimal...
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