公开(公告)号：US20210033513A1

公开(公告)日：2021-02-04

申请号：US17073875

申请日：2020-10-19

Applicant: Analog Devices, Inc.

Inventor： Shrenik DELIWALA

IPC: G01N15/06 ,  G08B17/107 ,  G08B17/103

Abstract: Device for optically detecting smoke and implementing thereof. Apparatus and methods for detecting the presence of smoke in a small, long-lasting smoke detector are disclosed. Specifically, the present disclosure shows how to build a very compact housing around the smoke detector while keeping the reflections from the housing structure to a very low value while satisfying all the other peripheral needs of fast response to smoke and preventing ambient light. This allows very small measurements of light scattering of the smoke particles to be reliable in a device resistant to the negative effects of dust. In particular, geometrical optical elements, e.g., cap and optical defection elements, are disclosed.

公开(公告)号：US20200284831A1

公开(公告)日：2020-09-10

申请号：US16792596

申请日：2020-02-17

Applicant: Analog Devices, Inc.

Inventor： Shrenik DELIWALA

IPC: G01R31/28 ,  G01N15/06

Abstract: Gain independent reference channel measurement system and method. A method of making robust, stable measurements, in a variety of different applications is disclosed. More specifically, this disclosure describes systems and methods relating to performing gain independent reference channel measurements by making two phase measurements of a device under test. Mathematically, the measurements are combined and many common mode parameters drop out. The result yields an analysis of a device under test analysis which mitigated errors, predominately arising from environmental variations and changes in circuit behavior stemming from swings in signal input.

公开(公告)号：US20190086244A1

公开(公告)日：2019-03-21

申请号：US16136223

申请日：2018-09-19

Applicant: Analog Devices, Inc.

Inventor： Shrenik DELIWALA

IPC: G01D5/353 ,  G02B6/42 ,  H01L31/167 ,  G02B6/02

Abstract: Fiber Bragg grating interrogation and sensing used for strain and temperature measurements. A simple, broadband light source is used to interrogate one or more fiber Bragg grating (FBG). Specifically, a packaged LED is coupled to fiber, the light therefrom is reflected off a uniform FBG. The reflected light is subsequently analyzed using a filter and a plurality of Si photodetectors. In particular, the filter is a chirped FBG or an optically coated filter, in accordance with some embodiments. Measurement analysis is performed by ratio of intensities at the plurality of detectors, at least in part.

公开(公告)号：US20180348121A1

公开(公告)日：2018-12-06

申请号：US15993188

申请日：2018-05-30

Applicant: Analog Devices, Inc.

Inventor： Shrenik DELIWALA

IPC: G01N21/3504 ,  G01N21/01

Abstract: System and apparatus for portable gas detection. Specifically, this disclosure describes apparatuses and systems for optical gas detection in a compact package. There is a need for a very compact, low-power, gas detection system for gases such as CO2, NOx, water vapor, methane etc. This disclosure provides an ultra-compact and highly efficient optical measurement system based on principals of optical absorption spectroscopy. It reduces the size of the instrument as well its power consumption by more than an order of magnitude making it possible to deploy it widely. There is an identified need for large number of distributed gas sensors to improve human health, environment, and save energy usage.