# US 2021/0239667 A1 · Shoulder mountable real-time air quality measurement device and air quality device calibration system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0239667 A1 - Document ID: US20210239667A1 - Status: Published application - Kind: A1 - Application number: 17/269,825 - Filed: 2019-08-20 - Published: 2021-08-05 - Earliest claimed: 2018-08-20 - Assignees: Yale University - Applicants: Yale University - Inventors: Drew Gentner; Fulizi Xiong - Web page: https://patentgrep.com/patent/US20210239667A1 ## CPC - G01N 33/0006: {Calibrating gas analysers} - G01N 1/2205: {with filters} - G01N 1/2273: {Atmospheric sampling} - G01N 21/274: {Calibration, base line adjustment, drift correction} - G01N 33/0009: {General constructional details of gas analysers, e.g. portable test equipment (devices for withdrawing samples in the gaseous state G01N1/22)} - G01N 33/0031: {comprising two or more sensors, e.g. a sensor array} - G01N 35/00693: {Calibration} - G01N 15/0211: {Investigating a scatter or diffraction pattern} - G01N 21/3504: for analysing gases, e.g. multi-gas analysis - G01N 21/53: within a flowing fluid, e.g. smoke - G01N 2001/2223: {aerosol sampling devices} - G01N 2001/2276: {Personal monitors} - G01N 2015/0046: {in gas, e.g. smoke} - G01N 2201/0221: Portable; cableless; compact; hand-held - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) ## Abstract An air quality measurement device includes a housing configured to rest on a shoulder of a user. The housing includes an air inlet directed to a breathing zone of the user, and an air outlet. An air quality sensor and an air pump within the housing is connected in-line between the air inlet and the air outlet. A calibration system for an air quality measurement device includes a gas sensor, a particulate matter sensor, and calibration elements: a particulate matter zeroing element configured to calibrate the particulate matter sensor, a gas sensor zeroing element to calibrate the zero response of the gas sensor(s), and a gas sensor known concentration element to calibrate the concentration response of the gas sensor(s). ## Claims ### Claim 1 An air quality measurement device comprising: a housing configured to rest on a shoulder of a user comprising an air inlet directed to a breathing zone of the user, and an air outlet; an air quality sensor and an air pump within the housing and connected in-line between the air inlet and the air outlet. ### Claim 2 (depends on 1) The air quality measurement device of claim 1, wherein the housing comprises a form-fitting crescent shape. ### Claim 3 (depends on 1) The air quality measurement device of claim 1, wherein the housing comprises an attachment mechanism configured to attached to a shoulder area of apparel or a shoulder strap. ### Claim 4 (depends on 3) The air quality measurement device of claim 3, wherein the shoulder strap is one of a bag strap, a backpack strap and a harness strap. ### Claim 5 (depends on 1) The air quality measurement device of claim 1, wherein the air inlet is directed towards an area in front of a user's face and the air outlet is directed to an area behind the user. ### Claim 6 (depends on 1) The air quality measurement device of claim 1, wherein the air quality sensor is at least one of a gas sensor and a particulate matter sensor. ### Claim 7 (depends on 1) The air quality measurement device of claim 1 further comprising a connection to an external battery and an external cell board. ### Claim 8 (depends on 1) The air quality measurement device of claim 1 further comprising an internally contained battery and an internally contained cell board. ### Claim 9 (depends on 8) An air quality measurement system comprising: the device of claim 8; and a battery and cell board unit configured to attach to a user using an attachment mechanism separate from the housing. ### Claim 10 A calibration system for an air quality measurement device comprising: a gas sensor, a particulate matter sensor, and particulate matter zeroing element configured to calibrate the particulate matter sensor. ### Claim 11 (depends on 10) The calibration system of claim 10, wherein an outlet to a manifold housing the gas sensor and filtered of particles at a main inlet is connected to the particulate matter zeroing element. ### Claim 12 (depends on 11) The calibration system of claim 11 further comprising: a 3-way valve configured to switch airflow from the outlet between the particulate matter zeroing element and a particulate matter sensor inlet. ### Claim 13 (depends on 10) The calibration system of claim 10, further comprising a gas phase zeroing element comprising a packed bed of mixed catalysts and adsorbents configured to filter out pollutants. ### Claim 14 (depends on 13) The calibration system of claim 13, wherein the packed bed comprises at least one of soda lime, ascarite, activated carbon, molecular sieves and steel wool. ### Claim 15 (depends on 13) The calibration system of claim 13, wherein the packed bed comprises at least two of soda lime, ascarite, activated carbon, molecular sieves and steel wool. ### Claim 16 (depends on 13) The calibration system of claim 13, wherein the packed bed comprises at least three of soda lime, ascarite, activated carbon, molecular sieves and steel wool. ### Claim 17 (depends on 13) The calibration system of claim 13, wherein the packed bed comprises soda lime, ascarite, activated carbon, molecular sieves and steel wool. ### Claim 18 (depends on 13) The calibration system of claim 13, wherein the gas phase zeroing element comprises a cylinder comprising pure air. ### Claim 19 (depends on 13) The calibration system of claim 13, wherein the gas phase zeroing element comprises a cylinder comprising a gas standard that does not contain any gases the gas sensor is responsive to. ### Claim 20 (depends on 13) The calibration system of claim 13, wherein the gas phase zeroing element comprises a UV-generating lamp configured to generate a constant concentration of ozone. ### Claim 21 (depends on 11) The calibration system of claim 11, wherein the system is configured to provide zero calibration measurements across a range of relative humidity and temperature points. ### Claim 22 (depends on 21) The calibration system of claim 21, further comprising a water vapor permeation device configured to maintain at least a minimum relative humidity inside the manifold during a gas sensor calibration. ### Claim 23 (depends on 10) The calibration system of claim 10, wherein the system is configured to provide air quality measurement for a plurality of pollutants. ### Claim 24 (depends on 10) The calibration system of claim 10, further comprising a gas phase calibration system comprising: a gas cylinder, the gas cylinder containing a known gas mixture; and a controlled dispensing system configured to expose the gas sensor to a fixed quantity of the known gas mixture; wherein the gas sensor is responsive to the known gas mixture directly as a measured analyte of interest or indirectly as a cross-responsive gas.