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With the advancement of clean energy, natural gas (methane) in the proportion of energy consumption increased year by year. Methane gas detection technology has become an important research direction in fire alarm area. Tunable diode laser absorption spectroscopy (TDLAS) is a new method of measuring trace methane gas, this gas detection technology has many unique advantages, such as intrinsic safe,...
The fire gas detection alarm system based on tunable diode laser absorption spectroscopy (TDLAS) is an early fire alarm technology which has high sensitivity, high resolution, low rate of false positives, rapid response, develops rapidly in recent years and has a broad application prospect. Tunable diode laser absorption spectroscopy using the wavelength tuning characteristics of semiconductor laser,...
A new safety system of optical fiber detection for methane measurement is described based on the near-infrared absorption mechanism. An optical fiber methane gas detector is designed for methane gas concentration below 5% v/v. The detector bases on tunable diode laser absorption spectroscopy, scans the methane gas absorption lines locate at 1653.722 nm, uses the orthogonal lock-in amplifier technology...
To evaluate the toxic effects of environmental contaminant PFOS on green algae, Chlorella pyrenoidosa was cultured in media containing serially diluted PFOS for evaluation of proliferation capacity and physiological indexes. Within 96h, PFOS dose equal or over 160 mg/L all inhibited the proliferation speed of Chlorella pyrenoidosa(p
Seeds of rice were treated with serial concentrations of perfluorooctane sulfonate (PFOS) for observation of germination and development. PFOS of 150 mg/L dose resulted in a germ inability rate of 87% and a germination rate of 88%, which was 96% and 97% respectively in control group. PFOS dose =120 mg/L all resulted in visible poor growth by seedlings falling or death. PFOS dose =90 mg/L inhibited...
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