High-accuracy mid-IR laser-based gas sensor
US-10107751-B2 · Oct 23, 2018 · US
Gas analyzer
US10288561B1 · US · B1
| Field | Value |
|---|---|
| Publication number | US-10288561-B1 |
| Application number | US-201815933393-A |
| Country | US |
| Kind code | B1 |
| Filing date | Mar 23, 2018 |
| Priority date | Mar 23, 2018 |
| Publication date | May 14, 2019 |
| Grant date | May 14, 2019 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
A gas analyzer is provided, capable of measuring specific gas amount information within a measurement target gas in which pressure varies greatly. The gas analyzer includes a calculation member for calculating specific gas amount information of the nth cycle, a gas pressure change amount calculation unit for calculating an amount of gas pressure change at each time, and a correction signal creation member for generating a time changing, corrected light intensity at each wavelength ν, by performing a fitting process using the time-changing intensity over a long time period in a time zone in which the amount of gas pressure change is small but using the time-changing intensity over a short time period in a time zone in which the amount of gas pressure change is large. The calculation member generates a light intensity change of the measurement light in the predetermined wavelength range of ν1 to ν2 of the nth cycle by using the time changing, corrected light intensity at each wavelength ν, and calculates the specified gas amount information for the nth cycle.
First claim
Opening claim text (preview).
What is claimed is: 1. A gas analyzer comprising: a light source member for irradiating measurement light at predetermined time intervals in a predetermined wavelength range of ν1 to ν2 to a target gas for measurement in an object for measurement; a light receiving member for receiving a light intensity I of the measurement light having passed through the measurement target gas; a calculation member for calculating specific gas amount information in n cycles, using a light intensity change I n (ν) of the measurement light in the predetermined wavelength range of ν1 to ν2 of the nth cycle; a pressure sensor for detecting a gas pressure P of the measurement target gas; a gas pressure change amount calculation member for generating a time-changing P(t) of the gas pressure P and for calculating an amount of gas pressure change ΔP(t) at each time t; an acquisition signal generating member for generating a time-changing I ν (t) of the light intensity at each wavelength ν; and a correction signal creation member for generating a time-changing i ν (t) of a corrected light intensity at each wavelength ν, by performing a fitting process using the time-changing I ν (t) over a long time interval in a time zone in which the amount of gas pressure change ΔP(t) is small but using the time-changing I ν (t) over a short time interval in a time zone in which the amount of gas pressure change ΔP(t) is large, wherein the calculation member generates a light intensity change i n (ν) of the measurement light in the predetermined wavelength range of ν1 to ν2 of the nth cycle by using the time-changing i ν (t) of the corrected light intensity at each wavelength ν, and calculates the specified gas amount information for the nth cycle. 2. The gas analyzer according to claim 1 , wherein the light source member comprises: a laser element; and a laser control member for oscillating the measurement light in the predetermined wavelength range ν1 to ν2 from the laser element at a constant period n. 3. The gas analyzer according to claim 2 , wherein the object to be measured includes an internal combustion engine that performs an intake step, a compression step, a combustion step, and an exhaust step in a predetermined cycle. 4. The gas analyzer according to claim 1 , wherein the object to be measured includes an internal combustion engine that performs an intake step, a compression step, a combustion step, and an exhaust step in a predetermined cycle.
Assignees
Inventors
Classifications
for analysing gases, e.g. multi-gas analysis · CPC title
- G01N21/39Primary
using tunable lasers · CPC title
Diode laser · CPC title
for pressure variations · CPC title
Gaseous flow · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US10288561B1 cover?
- A gas analyzer is provided, capable of measuring specific gas amount information within a measurement target gas in which pressure varies greatly. The gas analyzer includes a calculation member for calculating specific gas amount information of the nth cycle, a gas pressure change amount calculation unit for calculating an amount of gas pressure change at each time, and a correction signal crea…
- Who is the assignee on this patent?
- Shimadzu Corp
- What technology area does this patent fall under?
- Primary CPC classification G01N21/39. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue May 14 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (B1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).