Patent ID: 9395334
Filing Date: 2016-07-19
CPC Classification: G01G,G01N

Claim Text:
1. An atmospheric environment measuring apparatus comprising: a first filter disposed in a casing and adsorbing a component of a gas to be detected; a first mass sensor disposed in the casing between an inlet of the casing and the first filter, including a first piezoelectric vibration element and changing a resonance frequency according to a mass of a substance adhered on a surface of the first piezoelectric vibration element; a second mass sensor disposed in a stage following the first filter in the casing, including a second piezoelectric vibration element and changing a resonance frequency according to a mass of a substance adhered on a surface of the second piezoelectric vibration element; a second filter disposed in a stage following the second mass sensor in the casing and adsorbing a component of the gas to be detected; a third mass sensor disposed in a stage following the second filter in the casing, including a third piezoelectric vibration element and changing a resonance frequency according to a mass of a substance adhered on a surface of the third piezoelectric vibration element; and a fan disposed in a stage following the third mass sensor in the casing and fluidizing atmosphere from the inlet toward an outlet of the casing, wherein degradation of an adsorption ability of the first filter is judged based on the amount of change per unit time of the measured data given by the first mass sensor, the amount of change per unit time of the measured data given by the second mass sensor and an amount of change per unit time of the measured data given by the third mass sensor.