Method and apparatus for environmental monitoring and data logging

摘要

An economical particle monitor for use in measuring particulate matter in the atmosphere includes two detection chambers: an ionized atmosphere between two electrically biased plates with particulate matter affecting current flow through the ionized atmosphere between the plates and a light-scattering chamber in which light from a light-emitting diode is scattered from introduced particles and detected by a photo-electric detector. Measures of current flow are provided to a data logger as a measure of particulate matter in the atmosphere, and the data logger maintains a record of measured particulate matter along with temperature and humidity. Alternatively, the signals could be provided to an analog (dial) or digital display for instant read out. A plurality of detectors can be provided with each detector being sensitive to particles of a specific size range and concentration range. The recorded data of the data logger is periodically downloaded to a personal computer for analysis and reporting