本文關(guān)鍵詞：封裝西林藥瓶殘留氧氣檢測中的諧波基線校正和去噪方法　出處：《光譜學(xué)與光譜分析》2017年08期 　論文類型：期刊論文

  更多相關(guān)文章： 可調(diào)諧激光吸收光譜(TDLAS) 西林藥瓶殘留氧氣檢測 小波變換 基線校正 去噪

【摘要】：可調(diào)諧激光二極管吸收光譜(TDLAS)技術(shù)的成熟和快速非接觸氣體濃度測量的優(yōu)點,十分適合用于對封裝西林藥瓶內(nèi)殘留氧氣進(jìn)行濃度檢測。采用TDLAS技術(shù)對封裝西林藥瓶內(nèi)殘留氧氣進(jìn)行濃度檢測,檢測系統(tǒng)的光路經(jīng)過空氣和玻璃藥瓶,玻璃瓶壁對激光的散射和衰減是檢測系統(tǒng)的主要干擾,給二次諧波信號的穩(wěn)定性帶來了很大影響。設(shè)計和搭建了基于TDLAS的封裝西林藥瓶殘氧量檢測系統(tǒng)。針對從系統(tǒng)中提取出的二次諧波信號,提出了一種基于小波變換的基線消除和噪聲濾除方法,解決在殘留氧氣濃度檢測過程中基線漂移和噪聲干擾問題,克服玻璃瓶壁對二次諧波信號的干擾,效果明顯。選用"sym6"小波,將實驗測得的信號進(jìn)行五層小波分解,根據(jù)每一層小波分解得到的低頻分量求出相應(yīng)的基線斜率,對五個基線斜率進(jìn)行加權(quán)平均得到原始信號的基線斜率。由求得的基線斜率,對原始信號經(jīng)過去基線處理,再進(jìn)行小波分解和軟閾值處理后得到重構(gòu)信號。對氧氣濃度為21%的西林瓶的測量結(jié)果表明,處理后諧波信號和理論信號之間的相對誤差由處理前的1.26%下降到了0.12%,證明了此方法可以很好地解決在殘留氧氣濃度檢測過程中基線漂移和噪聲干擾問題,克服玻璃瓶壁對二次諧波信號的干擾,為氧氣濃度測量提供很高質(zhì)量的信號。
[Abstract]:Tunable diode laser absorption spectroscopy (TDLAS) technology and the maturity of the advantages of fast and non-contact measurement of gas concentration, and is very suitable for the packaging of bottles within the residual oxygen resistant concentration detection. Using TDLAS technology to package bottle residue resistant oxygen concentration detection, optical detection system through the air and glass bottles, scattering of laser the glass bottle wall and attenuation is the main interference detection system, brings great influence to the two harmonic signal stability. Design and build the packaging bottle resistant residual oxygen detection system based on TDLAS. According to the two harmonic signal is extracted from the system, proposes a wavelet transform to eliminate the noise and baseline based on the method of solution in the residual oxygen concentration during the detection of baseline drift and noise problems, overcome the jar of two harmonic signal interference, Guo Ming effect Show. Uses "sym6" wavelet, the signal measured by five layer wavelet decomposition, according to the low frequency components of each layer of wavelet decomposition for the corresponding baseline baseline slope, slope of the five baseline slope by the weighted average of the original signal. The baseline slope obtained, after the original signal to baseline then, wavelet decomposition and wavelet soft threshold is obtained after signal reconstruction. The measurement results show that the oxygen concentration of 21% vials of the relative error between the processed harmonic signal and the theory of signal processing by the 1.26% dropped to 0.12%, proved that this method can well solve the problem in the residual oxygen concentration detecting process in the baseline drift and noise problems, overcome the jar of two harmonic signal interference, provide high quality signal for the oxygen concentration measurement.

【作者單位】： 中南大學(xué)信息科學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(61533021,61174132) 高等學(xué)校博士學(xué)科點專項科研基金項目(20130162110067)資助
【分類號】：TN249;TQ460.69
【正文快照】： 引言封裝西林藥瓶內(nèi)殘留氧氣濃度在線檢測一直是相關(guān)行業(yè)的難點和熱點,藥瓶內(nèi)的殘氧量和瓶內(nèi)藥品的質(zhì)量和保質(zhì)期有著很密切的關(guān)系。瓶內(nèi)的氧氣含量如果超出了行業(yè)標(biāo)準(zhǔn),會使得藥品變質(zhì),給藥品生產(chǎn)和醫(yī)療安全帶來嚴(yán)重威脅。所以在藥品完成西林瓶封裝后,還必須進(jìn)行殘留氧氣濃度檢，

本文編號：1359627