JP2009020127A - 超音波ガス流量計を用いてガスの貫流を検出する方法 - Google Patents
超音波ガス流量計を用いてガスの貫流を検出する方法 Download PDFInfo
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- JP2009020127A JP2009020127A JP2008279029A JP2008279029A JP2009020127A JP 2009020127 A JP2009020127 A JP 2009020127A JP 2008279029 A JP2008279029 A JP 2008279029A JP 2008279029 A JP2008279029 A JP 2008279029A JP 2009020127 A JP2009020127 A JP 2009020127A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/02—Compensating or correcting for variations in pressure, density or temperature
- G01F15/022—Compensating or correcting for variations in pressure, density or temperature using electrical means
- G01F15/024—Compensating or correcting for variations in pressure, density or temperature using electrical means involving digital counting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/662—Constructional details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/667—Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/667—Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters
- G01F1/668—Compensating or correcting for variations in velocity of sound
Abstract
ガスの容積流或いは質量流、特に高い動的流れの正確且つ確実に検出する評価方法を改良すること。
【解決手段】
平均流速と流れるガス量とが運転時間から高い時間的解像度をもつ送信器と受信器の間の二つの音信号により検出されるガス流量を検出する、ガスの貫流を検出する方法のために、ガス、特に高動的流れの容積流或いは質量流の正確且つ確実な検出が達成される。
そのために、運転時間の決定後に流量用の仮定値が評価され、この仮定値は少なくともガスの特性的温度と測定管の壁の温度によって修正される。
【選択図】 図1
Description
その際に、図1はこの発明のガス流量計を概略的に示し、図2と2aはこの発明の容量式超音波変換器の全体図と詳細図を示し、図3は配列構成にて容積式超音波変換器を示し、図4は容量式超音波変換器の一次信号用のこの発明の増幅器回路を概略的に示し、図5はブロック線図形態で評価方法の表示であり、図6は送信器と受信器対の送信と受信信号の表示並びに受信信号の付属位相信号を示す。
1.....測定管
2.....加熱要素
3.....評価電子部
4.....加熱制御電子部
5.....据付け部
6.....カバー
7−10...変換器
11....受信電子部
12,13...温度センサー
14....圧力センサー
15....ラムダゾンデ
16....データ伝送ライン
17....変換器本体
18....金属性ダイアフラム
19....裏板
20....構成
21....絶縁層
22....変換器本体
23....金属性ダイアフラム23
24....裏板
25....絶縁基礎材料基体
26....電極
27....絶縁層
28....補助回路線図
29....結合抵抗
30....増幅器
31....コンデンサー
32....RC−素子
33....結合コンデンサー
34....フィルタ回路
35,36,37...段
Claims (20)
- 平均流速とそれからの流れるガス量とが運転時間から高い時間的解像度をもつ送信器と受信器の間の二つの音信号により検出されるガス流量を検出する方法において、運転時間の決定後に流量用の仮定値が評価され(35)、この仮定値は少なくともガスの特性的温度と測定管の壁の温度によって修正される(36)ことを特徴とする方法。
- 流量の仮定値を決定するために、測定管の現実の圧力値、特に正確に運転測定の箇所に関係されることを特徴とする請求項2に記載の方法。
- 仮定値はガスの特性的温度と測定管の壁の温度に依存して修正されることを特徴とする請求項1或いは請求項2に記載の方法。
- 測定管の壁の温度が測定されることを特徴とする請求項1乃至請求項3のいずれか一項に記載の方法。
- 測定管内のガスの温度が測定されることを特徴とする請求項1乃至請求項4のいずれか一項に記載の方法。
- ガスの特性的温度は、運転時間とそれによる測定管内の温度形状の物理的モデルに基づく音速度用の仮定値とから検出されることを特徴とする請求項1乃至請求項5のいずれか一項に記載の方法。
- ガスの特性的温度は、測定管の壁の温度の考慮によって精確に表現されることを特徴とする請求項6に記載の方法。
- 温度測定と運転時間測定用の時点の選択の際に装置の幾何学形状と流速が考慮されることを特徴とする請求項1或いは請求項7に記載の方法。
- ガス量(37)の仮定値の修正の際のガス組成を考慮するために、ガス量の算出用の断熱係数の公称値が採用されることを特徴とする請求項1乃至請求項8のいずれか一項に記載の方法。
- 断熱係数の公称値はガスの特性的温度に一致して修正されることを特徴とする請求項9に記載の方法。
- 超音波信号の送信時点と運転時間の仮定値とに依存して、受信信号の到着時点用の期待時間窓が求められることを特徴とする請求項1乃至請求項10のいずれか一項に記載の方法。
- 送信時点の連続性、即ち測定反復率は仮定された運転時間に依存して適合されることを特徴とする請求項1乃至請求項11のいずれか一項に記載の方法。
- 運転時間の仮定値として予め行った測定の運転時間が使用されることを特徴とする請求項11或いは請求項12に記載の方法。
- 運転時間の仮定値として予め行った流量測定の結果に依存してモデル的に形成された計算値が使用されることを特徴とする請求項11或いは請求項12に記載の方法。
- 運転時間を求めるために、まず最初に受信信号の開始用の仮定時点が確認され、精密開始は複雑な値に図示された受信信号の位相情報の分析によって確認されることを特徴とする請求項11乃至請求項14のいずれか一項に記載の方法。
- 複雑な受信信号は実際の受信信号のヒルバート変換によって求められることを特徴とする請求項15に記載の方法。
- 現実の受信信号のために受信信号の複雑な表示の現実の位相位置が求められ、位相位置の連続変更の領域における任意の時点で受信信号の開始用の仮定時点が確認されることを特徴とする請求項16に記載の方法。
- 受信信号の開始の仮定時点のために最大振幅の発生時点が使用されることを特徴とする請求項15に記載の方法。
- 受信信号の開始用の仮定時点から出発して受信信号の精密な開始は最初に生じた位相位置に基づいて求められることを特徴とする請求項15に記載の方法。
- 受信信号の第一零通過は求める信号特徴の到着時点として定義されていることを特徴とする請求項19に記載の方法。
Applications Claiming Priority (1)
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AT0050703U AT6511U3 (de) | 2003-07-16 | 2003-07-16 | Ultraschall-gasdurchflusssensor sowie vorrichtung zur messung von abgas-strömungen von verbrennungskraftmaschinen sowie ein verfahren zur ermittlung des durchflusses von gasen |
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JP2004208932A Division JP4361843B2 (ja) | 2003-07-16 | 2004-07-15 | 超音波ガス流量計 |
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JP2004208932A Expired - Fee Related JP4361843B2 (ja) | 2003-07-16 | 2004-07-15 | 超音波ガス流量計 |
JP2008279029A Pending JP2009020127A (ja) | 2003-07-16 | 2008-10-30 | 超音波ガス流量計を用いてガスの貫流を検出する方法 |
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US (1) | US7093502B2 (ja) |
EP (1) | EP1498700A3 (ja) |
JP (2) | JP4361843B2 (ja) |
CN (2) | CN1325881C (ja) |
AT (1) | AT6511U3 (ja) |
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CN110515082A (zh) * | 2019-09-06 | 2019-11-29 | 长春工程学院 | 一种基于超声波的自动测距系统 |
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Also Published As
Publication number | Publication date |
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JP2005037397A (ja) | 2005-02-10 |
EP1498700A3 (de) | 2005-08-17 |
CN101078640B (zh) | 2011-04-06 |
AT6511U3 (de) | 2004-09-27 |
CN1325881C (zh) | 2007-07-11 |
CN101078640A (zh) | 2007-11-28 |
US7093502B2 (en) | 2006-08-22 |
JP4361843B2 (ja) | 2009-11-11 |
CN1576803A (zh) | 2005-02-09 |
AT6511U2 (de) | 2003-11-25 |
EP1498700A2 (de) | 2005-01-19 |
US20050066744A1 (en) | 2005-03-31 |
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