GAS CONCENTRATION MEASUREMENT DEVICE

• Main Authors: SHINFUKU YOSHIFUMI, SEKI TAKUYA
• Format: Patent
• Language: English; Japanese
• Published: 24.05.2023
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

To perform a measurement of gas concentration simply and accurately.SOLUTION: A gas concentration measurement device 100 comprises: a concentration measurement space 22; a transmission unit 14 that transmits an ultrasonic wave to the concentration measurement space 22 in responce to a transmission signal; a reception unit 16 that receives the ultrasonic wave propagating through the concentration measurement space 22, and outputs a reception signal; and an analysis unit 18. The analysis unit 18 is configured to obtain a space propagation time in the concentration measurement space 22 on the basis of a timing when the transmission signal is input to the transmission unit 14 and a timing when the reception signal is output from the reception unit 16, and obtain concentration of gas of a measurement object on the basis of the space propagation time. The analysis unit 18 is configured to obtain a correction value relevant to a direct wave type propagation time on the basis of the direct wave type propagation time and a reflection wave type propagation time, and obtain a space propagation time on the basis of a post-correction propagation time having the direct wave type propagation time corrected based on the correction value, or one of the direct wave type propagation time of the reflection wave type propagation time and a propagation time corresponding to a value related to the direct wave type propagation time.SELECTED DRAWING: Figure 1 【課題】本発明は、気体濃度の測定を簡単かつ正確に行うことを目的とする。【解決手段】気体濃度測定装置１００は、濃度測定空間２２と、送信信号に応じて濃度測定空間２２に超音波を送信する送信部１４と、濃度測定空間２２を伝搬した超音波を受信し、受信信号を出力する受信部１６と、解析部１８とを備える。解析部１８は、送信部１４に送信信号が入力されるタイミングと、受信部１６から受信信号が出力されるタイミングとに基づいて、濃度測定空間２２における空間伝搬時間を求め、空間伝搬時間に基づいて測定対象の気体の濃度を求める。解析部１８は、直接波方式伝搬時間と、反射波方式伝搬時間とに基づいて、直接波方式伝搬時間に対する補正値を求め、直接波方式伝搬時間を補正値に基づいて補正した補正後伝搬時間、または、反射波方式伝搬時間のうち直接波方式伝搬時間もしくはそれに関連する値に応じた一方に基づいて空間伝搬時間を求める。【選択図】図１