PORTABLE DEVICE FOR DETECTING AND MEASURING PARTICLES ENTRAINED IN THE AIR

摘要

A portable ambient air quality monitor having an enclosure to enclose and protect the monitor from an ambient environment and an airflow intake for controllably allowing ambient air to enter the monitor. A photodiode is disposed at a location downstream from a fan. The airflow from the fan is laminarized by a mesh or baffle to allow a thin stream of air to flow over the photodiode. A sensing region is defined by an intersection of an airflow sampling path and an optical path. The sensing region is also disposed above the photodiode. The airflow sampling path is configured to receive laminar airflow from the airflow intake and for directing the laminar airflow into the sensing region. A light beam is generated from a laser to reflect the light beam for reducing the required area of the sensing region to detect and measure the particles floating in the ambient air.

主权项

1. A portable ambient air quality monitor comprising:
an enclosure to enclose and protect the monitor from an ambient environment, the enclosure having a controlled airflow intake for receiving ambient air, for forming an airflow sampling path and for laminarizing the airflow in the sampling path; and a sensor, having a sensing region, coupled to the airflow intake in the sampling path for receiving laminar airflow from the airflow intake and for directing the laminar airflow into the sensing region to detect and measure particles entrained in the ambient air.