JP5771181B2 - 複数の成分を含むガスを分析するために測定空気チャンバ内に設けられたセンサチップ - Google Patents
複数の成分を含むガスを分析するために測定空気チャンバ内に設けられたセンサチップ Download PDFInfo
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- G—PHYSICS
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- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/483—Physical analysis of biological material
- G01N33/497—Physical analysis of biological material of gaseous biological material, e.g. breath
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2406—Electrostatic or capacitive probes, e.g. electret or cMUT-probes
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- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/34—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor
- G01N29/348—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with frequency characteristics, e.g. single frequency signals, chirp signals
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- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
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- G—PHYSICS
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Description
さらにインタフェースで、狭窄、拡張、屈曲又は変形がインピーダンス変化を生じ、従って乱流を生じさせる可能性がある。さらに、速いフロー変化(呼吸による)が、制御されない乱流を生じさせて強くシグナルを減衰させることもあり得る。
結果として、少なくとも検出チャンバは相当大きくなければならず、さらにパワーを要するものである。これは小型のオンチップ超音波装置の使用を妨げる。さらに、小型のセンサ装置の適用を不可能とする。
a)設計パラメータ:図3に示されるように、R=膜半径332
b)材料パラメータ:h=厚さ;E=ヤング率;V=ポアソン比
ウェハ上で、絶縁層の厚さ及び材料定数は固定される。
p∝νgas・A、ここでνgasはガス速度である。
追加のポンプ手段(真空)が前記制限によるフロー抵抗を相殺するために使用され得る。
Claims (14)
- 複数の成分を含むガスを分析するために測定空気チャンバ内に設けられたセンサチップであり、
前記センサチップが超音波を送受信するための複数のセルを含み、
前記複数のセルが50kHz及び10MHzの間の周波数範囲にわたり、前記複数のガス成分のうちの少なくとも1つの成分の濃度を、前記周波数範囲内で少なくとも2つの超音波応答に基づいて測定するように作動可能とされ、
前記測定空気チャンバは、空気チャンバ断面内に寸法的制限を設けて前記測定空気チャンバ内でガス圧力を変動させ、前記寸法的制限がセルに対する前記ガス圧力をセル毎に選択的に変動させ、複数のセルのそれぞれの周波数を変動させて、前記濃度の測定を達成する、センサチップ。 - 請求項1に記載のセンサチップであり、前記複数のセル中でのそれぞれのセルの周波数は、前記周波数範囲内で変動する、センサチップ。
- 請求項2に記載のセンサチップであり、前記複数のセルが前記送受信のための膜を有しており、それぞれの膜がサイズを持ち、前記膜サイズ及び/又は前記膜のそれぞれのバネ定数を前記複数のセルで相違させることによってそれぞれの周波数の変動を実現する、センサチップ。
- 請求項2に記載のサンサチップであり、前記複数のセルがバイアス電圧を有しており、前記バイアス電圧を前記複数のセルにつき相違させることによってそれぞれの周波数の変動を実現する、センサチップ。
- 請求項2に記載のセンサチップであり、測定すべきガス濃度について、前記複数のセルのひとつのセルを十分に広い範囲で、前記セルのバイアス電圧を変動させることで順に調節し、それにより前記少なくとも2つの超音波応答のうちの異なる応答を取得する、センサチップ。
- 請求項1に記載のセンサチップであり、前記周波数範囲が50kHzから10MHzの範囲に拡張される、センサチップ。
- 請求項1に記載のセンサチップであり、前記複数のセルのひとつのセルが容量性装置を含む、センサチップ。
- 請求項7に記載のセンサチップであり、前記容量性装置がcMUT(容量性マイクロマシン超音波トランスデューサ)を含む、センサチップ。
- 請求項7に記載のセンサチップであり、前記容量性装置がMEMS(マイクロマシンシステム)マイクロホンを含む、センサチップ。
- 請求項1に記載のセンサチップであり、前記複数のガス成分のそれぞれの濃度を全て測定することを含む、センサチップ。
- 請求項1に記載のセンサチップであり、前記センサチップがさらに呼気中の二酸化炭素濃度を測定するためのカプノグラフセンサとして構成される、センサチップ。
- 請求項1に記載のセンサチップであり、前記複数のセルが超音波を前記セルの膜を横切る空気フローに放射し、前記複数のセルが空気フローの方向に配置される、センサチップ。
- 請求項12に記載のセンサチップであり、前記空気フローが呼気を含み、かつ前記センサチップはさらに、前記濃度の測定がチップ上以外のセンサを必要とすることなく実施されるように超音波の飛行時間を決定する、センサチップ。
- 測定空気チャンバ内に設けられた空気成分測定チップであり、前記チップは:
超音波を送受信するための柔軟性膜を有する容量性トランスデューサのアレイを含み、それぞれの膜がサイズを有し、
空気フローの方向に複数の前記トランスデューサを用いて空気フローを測定するためのオンチップアルゴリズム装置を含み、前記オンチップアルゴリズム装置はさらに、トランスデューサプレート上の容量性測定、抵抗エレメント及びオンチップ熱電対のうちの少なくとも1つにより温度を測定し、
前記トランスデューサのバイアス電圧及び/又は膜サイズを前記トランスデューサの中で相違させて50kHz及び10MHzの間の超音波周波数範囲を達成し、かつチップ上以外のセンサを必要とせずに、空気中の窒素、酸素、水及び二酸化炭素の濃度を測定し、
測定空気チャンバが、空気チャンバ断面内に寸法的制限を設けて前記測定空気チャンバ内でガス圧力を変動させ、前記寸法的制限がセルに対する前記ガス圧力をセル毎に選択的に変動させ、複数のセルのそれぞれの周波数を変動させて、前記濃度の測定を達成する、
空気成分測定チップ。
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US16236109P | 2009-03-23 | 2009-03-23 | |
US61/162,361 | 2009-03-23 | ||
PCT/IB2010/051043 WO2010109363A2 (en) | 2009-03-23 | 2010-03-10 | Gas sensing using ultrasound |
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JP5771181B2 true JP5771181B2 (ja) | 2015-08-26 |
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US (1) | US8689606B2 (ja) |
EP (1) | EP2411799B1 (ja) |
JP (1) | JP5771181B2 (ja) |
CN (1) | CN102362178B (ja) |
BR (1) | BRPI1006205B8 (ja) |
WO (1) | WO2010109363A2 (ja) |
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