Method of compensating for drift in gas sensing equipment
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0751668
(2000-12-29)
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발명자
/ 주소 |
- Kouznetsov, Andrian
- Nelson, Audrey
- Maddux, Brian C.
- Higgins, Don Q.
- Nisbet, Jean A.
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출원인 / 주소 |
- Edwards Systems Technology, Inc.
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
7 인용 특허 :
8 |
초록
▼
A method for compensating for baseline or span drift in gas sensing equipment includes obtaining gas concentration data over a time period and identifying a quiescent period within that time period. The method compares a component concentration corresponding to the quiescent period with one or more
A method for compensating for baseline or span drift in gas sensing equipment includes obtaining gas concentration data over a time period and identifying a quiescent period within that time period. The method compares a component concentration corresponding to the quiescent period with one or more additional component concentrations relating to different quiescent periods and calculates an estimated background gas concentration for a predetermined number of time periods. The estimated background concentration is then compared to a preset, or expected, background concentration, and a correction value is calculated. For baseline drift, a correction value is determined to be the difference between the estimated background concentration and the present (expected) background concentration. For span drift, a correction value is determined to be the ratio of the estimated background concentration to the preset (expect) background concentration. Measured concentrations by the gas sensor are then adjusted by the correction value.
대표청구항
▼
A method for compensating for baseline or span drift in gas sensing equipment includes obtaining gas concentration data over a time period and identifying a quiescent period within that time period. The method compares a component concentration corresponding to the quiescent period with one or more
A method for compensating for baseline or span drift in gas sensing equipment includes obtaining gas concentration data over a time period and identifying a quiescent period within that time period. The method compares a component concentration corresponding to the quiescent period with one or more additional component concentrations relating to different quiescent periods and calculates an estimated background gas concentration for a predetermined number of time periods. The estimated background concentration is then compared to a preset, or expected, background concentration, and a correction value is calculated. For baseline drift, a correction value is determined to be the difference between the estimated background concentration and the present (expected) background concentration. For span drift, a correction value is determined to be the ratio of the estimated background concentration to the preset (expect) background concentration. Measured concentrations by the gas sensor are then adjusted by the correction value. with said contact means so as to drive said one tool to perform a forming operation on said worksheet. 4. A sheet fabrication machine, comprising: a tool means having one direction convert member movable in a first direction; a die means having an other direction convert member movable along said first direction to work cooperatively with said tool means along said first direction, said tool and die means act against each other when moved toward each other along said first direction; a first servo motor means for bidirectionally driving one contact means along a first longitudinal axis in a direction different from said first direction, said one contact means making contact with said one direction convert member for driving said tool means along said first direction; a second servo motor means for bidirectionally driving an other contact means along a second longitudinal axis in a direction different from said first direction, said other contact means making contact with said other direction convert member for driving said die means along said first direction; wherein, when a worksheet is positioned between said tool means and said die means, said tool means and die means are driven by said one and other direction convert members, respectively, to effect work on said worksheet when said one and other direction convert members are contacted by said one and other contact means driven by said first servo motor means and said second servo motor means, respectively. 5. Machine of claim 4, wherein said first contact means is a roller and wherein direction convert member of said tool means includes a cam at the top thereof that coacts with said roller, said first servo motor means driving said roller along said first axis so that, as said roller is being driven by said first servo motor means and comes into contact with said cam, said tool means is driven along said first direction relative to said die means. 6. Machine of claim 5, wherein said one direction convert member includes a circular top with at least two different portions that coacts with said roller, said first servo motor means driving said roller along first axis so that, as said roller is being driven by said first servo motor means and comes into contact with said portions of said circular top, said tool means is driven along said first direction relative to said die means. 7. Machine of claim 5, wherein said first direction is perpendicular to the plane of said worksheet, and wherein said die means is driven along said first direction to effect a forming operation on said worksheet. 8. Machine of claim 5, wherein said cam is configured to have a pair of first upward sloping surfaces each extending to respective second upward sloping surfaces, said respective second upward sloping surfaces meeting to form an apex that defines the uppermost area of said cam; wherein at least one of said first upward sloping surfaces, when coacting with said roller, enables the tool of said tool means to be exchanged with another tool; wherein each of said second sloping surfaces, when coacting with said roller, enables said tool means to come into contact with either said die means or said worksheet positioned over said die means, the coaction of said roller with said each second sloping surfaces further enables said tool means to perform a forming operation on said worksheet; and wherein when said roller coacts with said apex, said tool means is driven to penetrate said worksheet. 9. Machine of claim 4, wherein said second contact means is a roller and wherein said die means includes a wedge means at the bottom thereof that coacts with said roller, said second servo motor means driving said roller along said second axis so that, as said roller is being driven by said second servo motor means and comes into contact with said wedge means, said die means is driven along said first direction relative to said tool means. 10. Machine of claim 4, wherein said die means is dr
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