JPWO2017073427A1 - 漏洩ガス検出装置および漏洩ガス検出方法 - Google Patents
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Abstract
Description
PB−PA=ε∫exp(α(λ)ct)S(λ)[B(Tback_B,λ)−B(Tback_A,λ)]dλ ・・・(1)
ここで、PAは、箇所Aにおける赤外線カメラによって観測された赤外線量であり、B(Tback_A,λ)は、箇所Aにおける背景輻射赤外線量であり(Tback_Aは箇所Aにおける背景温度であり、λは波長である)、PBは、箇所Bにおける赤外線カメラによって観測された赤外線量であり、B(Tback_B,λ)は、箇所Bにおける背景輻射赤外線量であり(Tback_Bは箇所Bにおける背景温度である)、S(λ)は、光学系の透過率であり、ctは、ガスの濃度厚み積であり(cは濃度であり、tは厚みである)、εは、背景放射率であり、α(λ)は、ガス吸収率である。積分∫は、観測した赤外線の波長範囲に亘って実行される。
P=∫[τg(λ、ct)B(Tback,λ)+(1−τg(λ、ct))B(Tg,λ)]dλ ・・・(2)
P=∫[B(Tg,λ)+τg(λ、ct){B(Tback,λ)−B(Tg、λ)}]dλ ・・・(3)
ここで、τg(λ、ct)は、ガスの吸収率であり、波長λおよび濃度厚み積ctの関数であり、したがって、(1−τg(λ、ct))は、前記ガスの放射率である。B(Tback,λ)は、背景が輻射(放射)した赤外線の量(背景輻射赤外線量)であり、背景温度Tbackおよび波長λの関数であり、B(Tg,λ)は、ガス雲GSのガスが輻射(放射)した赤外線の量(ガス輻射赤外線量)であり、ガス温度Tgおよび波長λの関数である。これらτg(λ、ct)、B(Tback,λ)およびB(Tg,λ)の各関数における関数形(関数のグラフの形)は、予め既知である。一例では、メタンガスにおける波長λに対する透過率τは、図3に示す特性曲線であり、メタンガスにおける波長λに対する分光放射輝度は、温度27℃において、図4に示す特性曲線である。前記分光放射輝度に基づいて前記ガス輻射赤外線量が求められる。また、前記背景輻射赤外線量は、背景物を黒体とみなし黒体放射に基づいて求められる。式2および式3それぞれの積分∫は、観測した赤外線の波長範囲に亘って実行される。
Claims (7)
- 対象領域の赤外線画像を取得する赤外線画像取得部と、
前記赤外線画像取得部で取得した前記対象領域の赤外線画像に基づいて、漏洩ガスで形成されたガス雲のガス雲画像領域を抽出するガス雲処理部と、
前記ガス雲のガス温度を取得するガス雲温度取得部と、
前記ガス雲の濃度厚み積を求める濃度厚み積処理部と、
前記ガス雲処理部で抽出したガス雲画像領域における背景温度と前記ガス雲温度取得部で取得したガス温度とに基づいて、前記濃度厚み積処理部で求めた前記ガス雲の濃度厚み積に対する、信頼性の度合いを表す指標である信頼度を求める信頼度処理部とを備える、
漏洩ガス検出装置。 - 前記ガス雲処理部で抽出されたガス雲画像領域、前記濃度厚み積処理部で求めた前記漏洩ガスの濃度厚み積、および、前記信頼度処理部で求めた前記信頼度を表示部に対して表示可能とする表示処理部とをさらに備え、
前記濃度厚み積処理部は、前記赤外線画像取得部で取得した前記対象領域の赤外線画像に基づいて、前記ガス雲における複数の箇所それぞれについて前記ガス雲の濃度厚み積をそれぞれ求め、
前記信頼度処理部は、前記ガス雲における前記複数の箇所それぞれで求めた複数の前記ガス雲の濃度厚み積それぞれに対する前記信頼度をそれぞれ求め、
前記表示処理部は、前記ガス雲における前記複数の箇所それぞれについて、当該箇所に対応する前記信頼度が所定の第1閾値以下である場合には、当該箇所に対応する領域を所定の色で塗りつぶして前記表示部に表示し、当該箇所に対応する前記ガス雲の濃度厚み積および信頼度を前記表示部に表示しない、
請求項1に記載の漏洩ガス検出装置。 - 前記濃度厚み積処理部は、前記赤外線画像取得部で取得した前記対象領域の赤外線画像に基づいて、前記ガス雲における複数の箇所それぞれについて前記ガス雲の濃度厚み積をそれぞれ求め、
前記信頼度処理部は、前記ガス雲における前記複数の箇所それぞれで求めた複数の前記ガス雲の濃度厚み積それぞれに対する前記信頼度をそれぞれ求め、
前記ガス雲における前記複数の箇所それぞれについて、当該箇所に対応する前記信頼度が所定の第2閾値以下である場合には、当該箇所の周囲の箇所で最も信頼度が高い箇所を判定する周囲信頼度判定処理部をさらに備える、
請求項1に記載の漏洩ガス検出装置。 - 前記ガス雲処理部で抽出されたガス雲画像領域、前記濃度厚み積処理部で求めた前記漏洩ガスの濃度厚み積、および、前記信頼度処理部で求めた前記信頼度を表示部に対して表示可能とする表示処理部をさらに備え、
前記表示処理部は、前記信頼度を前記濃度厚み積の表示色で表示する、
請求項1に記載の漏洩ガス検出装置。 - 前記濃度厚み積処理部は、前記信頼度処理部で求めた前記信頼度が所定の第3閾値以下である場合、所定の時間の経過後に、前記ガス雲の濃度厚み積を再度求める、
請求項1ないし請求項4のいずれか1項に記載の漏洩ガス検出装置。 - 前記ガス雲温度取得部は、大気の温度を検出する温度センサである、
請求項1ないし請求項5のいずれか1項に記載の漏洩ガス検出装置。 - 対象領域の赤外線画像を取得する赤外線画像取得工程と、
前記赤外線画像取得工程で取得した前記対象領域の赤外線画像に基づいて、漏洩ガスで形成されたガス雲のガス雲画像領域を抽出するガス雲処理工程と、
前記ガス雲のガス温度を取得するガス雲温度取得工程と、
前記ガス雲の濃度厚み積を求める濃度厚み積処理工程と、
前記ガス雲処理工程で抽出したガス雲画像領域における背景温度と前記ガス雲温度取得工程で取得したガス温度とに基づいて、前記濃度厚み積処理工程で求めた前記ガス雲の濃度厚み積に対する、信頼性の度合いを表す指標である信頼度を求める信頼度処理工程とを備える、
漏洩ガス検出方法。
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JPH0493745A (ja) * | 1990-08-09 | 1992-03-26 | Japan Sensor Kk | ガス漏れ検出装置 |
US20100231722A1 (en) * | 2009-03-16 | 2010-09-16 | Southwest Research Institute | Compact handheld detector for greenhouse gasses |
JP2015099168A (ja) * | 2015-03-03 | 2015-05-28 | 三菱電機株式会社 | 気体検出装置 |
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JP6773043B2 (ja) | 2020-10-21 |
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