# US 2019/0318597 A1 · Chamberless air quality monitors with temperature sensing

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- Number: US 2019/0318597 A1
- Document ID: US20190318597A1
- Status: Published application
- Kind: A1
- Application number: 16/454,784
- Filed: 2019-06-27
- Published: 2019-10-17
- Earliest claimed: 2018-01-15
- Assignees: Kidde Technologies, Inc.
- Applicants: Kidde Technologies, Inc.
- Inventors: Michael J. Birnkrant; David L. Lincoln
- Web page: https://patentgrep.com/patent/US20190318597A1

## CPC

- G08B 17/107: for detecting light-scattering due to smoke
- G01K 13/02: for measuring temperature of moving fluids or granular materials capable of flow
- G01K 15/005: {Calibration}
- G01N 21/534: {by measuring transmission alone, i.e. determining opacity}
- G08B 17/103: using a light emitting and receiving device
- G01K 13/024: of moving gases
- G01N 2021/3155: {Measuring in two spectral ranges, e.g. UV and visible}
- G01N 2021/3181: {using LEDs}
- G01N 2201/0668: Multiple paths; optimisable path length
- G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G01K: MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (radiation pyrometry G01J5/00)
- 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

A chamberless indoor air quality monitor system includes a detector body. A resistive heater is operatively connected to the detector body. An active temperature sensor operatively connected to the resistive heater and operatively connected to an outer surface of the detector body configured to take an active temperature measurement. A method for measuring temperature in a chamberless indoor air quality monitor system includes generating an active temperature measurement with an active temperature sensor operatively connected to an outer surface of the detector body. The method includes heating the active temperature sensor with a resistive heater operatively connected to the detector body. The method includes comparing the active temperature measurements to one another to generate a corrected active temperature measurement based on a temperature difference over time between one or more of the active temperature measurements.

## Claims

### Claim 1

A chamberless indoor air quality monitor system, comprising:
a detector body, a resistive heater operatively connected to the detector body; and
an active temperature sensor operatively connected to the resistive heater and operatively connected to an outer surface of the detector body configured to take an active temperature measurement.

### Claim 2 (depends on 1)

The system of claim 1, further comprising a processor operatively connected to the active temperature sensor configured to receive active temperature measurements from the active temperature sensor and generate a corrected active temperature measurement based on a temperature difference over time between one or more active temperature measurements.

### Claim 3 (depends on 1)

The system of claim 1, further comprising a passive temperature sensor operatively connected to a printed circuit board (PCB) and enclosed within the detector body configured to take a passive temperature measurement.

### Claim 4 (depends on 1)

The system of claim 1, wherein the active temperature sensor is a resistance-temperature detector (RTD).

### Claim 5 (depends on 1)

The system of claim 1, wherein the active temperature sensor is a thermocouple.

### Claim 6 (depends on 1)

The system of claim 1, further comprising one or more light sources operatively connected to the detector body configured to emit light into a monitored space.

### Claim 7 (depends on 6)

The system of claim 6, further comprising at least three light sensing devices operatively connected to the detector body configured to receive scattered light emitted from the one or more light sources, wherein the at least three light sensing devices share a common centerline axis configured to provide overlapping sensing regions for close proximity detection of the scattered light.

### Claim 8 (depends on 7)

The system of claim 7, further comprising a processor configured to evaluate the received scattered light signals for presence of one or more indoor air quality conditions in the monitored space.

### Claim 9

An aircraft management system comprising:
chamberless indoor air quality monitor systems; and
an aircraft management computer operatively connected to each of the chamberless indoor air quality monitor systems to correlate and compare data across each of the chamberless indoor air quality monitor systems, wherein each chamberless indoor air quality monitor system includes:
a detector body;
a resistive heater operatively connected to the detector body; and
an active temperature sensor operatively connected to the resistive heater and operatively connected to an outer surface of the detector body configured to take an active temperature measurement.