規(guī)格:NDIR紅外氣體分析, 德國(guó)DIAS紅外探測(cè)器應(yīng)用系列1
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NDIR紅外氣體分析, 德國(guó)DIAS紅外探測(cè)器應(yīng)用系列1, 德國(guó)DIAS紅外公司的單元紅外探測(cè)器應(yīng)用, 德國(guó)DIAS紅外公司的多元紅外探測(cè)器應(yīng)用,
NDIR gas analysis NDIR氣體分析
許多氣體以一定特征吸收光譜吸收紅外輻射,這是由各自氣體的特定分子結(jié)構(gòu)決定的。NDIR氣體分析是一種相對(duì)便宜的方法,可用于精確測(cè)定單種氣體的濃度,它利用待檢測(cè)氣體的單個(gè)物質(zhì)典型吸收帶。
Many gases absorb infrared radiation in a characteristic absorption spectrum, which is determined by the specific molecular structure of the respective gas. Non-dispersive infrared gas analysis (NDIR gas analysis) is a comparatively inexpensive method for an exact determination of the concentration of individual gases, which utilizes individual substance-typical absorption bands of the gases to be detected.

待分析的混合氣體位于寬帶紅外輻射器及紅外探測(cè)器之間定義好的體積之內(nèi)。吸收紅外探測(cè)器的寬帶備有一個(gè)窄帶濾光片,其峰值傳輸正好位于待分析氣體的典型吸收帶。如果使用有多個(gè)光譜通道的紅外探測(cè)器代替單元
紅外探測(cè)器,則可以同時(shí)檢測(cè)多個(gè)離散氣體。紅外輻射器的發(fā)射光譜必須至少覆蓋所用吸收帶的光譜范圍。
如果在紅外輻射器及紅外探測(cè)器中沒有檢測(cè)到氣體,輻射出來(lái)的輻射能量幾乎可以毫無(wú)阻礙地?fù)糁性摷t外探測(cè)器,并在此生成最大可能的信號(hào)。隨著待測(cè)氣體的濃度增加,在其典型吸收光譜上的吸收會(huì)增加, 于是帶窄波段調(diào)諧的紅外探測(cè)器會(huì)輻射一個(gè)較低的信號(hào)。如果還有其它氣體通道的話,這些其它氣體通道也會(huì)相應(yīng)地對(duì)其它氣體起作用。
The gas mixture to be analyzed is located in a defined volume between a broadband IR emitter and an infrared sensor. The broadband absorbing IR sensor is equipped with a narrowband filter which has its peak transmission exactly at a typical absorption band of the gas to be analyzed. If a sensor with multiple spectral channels is used instead of a single-element sensor, several discrete gases can be detected simultaneously. The emission spectrum of the emitter must cover at least the spectral range of the absorption bands used.
If there is no gas to be detected between the emitter and the sensor, the emitted radiation hits the sensor almost unhindered and generates the maximum possible signal there. With increasing concentration of a gas to be measured, the absorption on its typical absorption spectrum increases and thus the sensor with the narrowband filter tuned to it emits a lower signal. The other channels, if any, react accordingly only to other gases
| Gas氣體 | Absorption band吸收帶 |
| CH4 | 3.33 µm |
| HC | 3.40 µm |
| Reference基準(zhǔn)氣體 | 3.91 µm |
| CO2 | 4.26 µm & 4.43 µm |
| CO | 4.64 µm |
| NO | 5.30 µm |
| NO2 | 6.22 µm |
| SO2 | 7.30 µm |
| Freon R134a 氟利昂 | 10.27 µm |
| Freon R12 氟利昂 | 11.30 µm |
對(duì)標(biāo)準(zhǔn)分析測(cè)量任務(wù),紅外探測(cè)器類型PYROSENSLTA 系列及LTM系列特別適合。而采用德國(guó)DIAS紅外公司特別開發(fā)的PYROSENS LTMI系列及LTSI系列紅外探測(cè)器系列,NDIR氣體分析可以測(cè)量濃度很低的氣體,其濃度最低可到一位數(shù)的ppm。相應(yīng)的檢測(cè)范圍取決于測(cè)量單元的結(jié)構(gòu)以及待測(cè)的氣體。典型的光譜范圍約為1μm至20μm,但我們的紅外探測(cè)器甚至可以在遠(yuǎn)高于100μm的波長(zhǎng)上使用。
PYROSENS紅外探測(cè)器用于冰箱及空調(diào)系統(tǒng)的泄露檢測(cè)或泄露測(cè)試,以及高精度及溫度穩(wěn)定的氣體濃度測(cè)試,這些氣體有CO、CO2及CH4,而CO及CO2間的交叉靈敏度比較低,常用于人類及獸醫(yī)。
此外,在半導(dǎo)體行業(yè),PYROSENS還可以用于半導(dǎo)體行業(yè)的真空室清潔過(guò)程的終端監(jiān)控的氣體監(jiān)控。
For standard measurement tasks, the sensors of the type series PYROSENS LTA and LTM are perfectly suitable. With the type series PYROSENS LTMI and LTSI DIAS Infrared GmbH offers highly developed pyroelectric IR sensors which allow NDIR gas analysis even for lowest gas concentrations in the single digit ppm range. The respective detection limit depends on the construction of the measuring cell as well as on the gas to be detected. The typical spectral range is between approx. 1 µm and 20 µm, but our sensors can even be used at wavelengths far above 100 µm.
Für Standardmessaufgaben sind die Sensoren der Typenreihen PYROSENS LTA und LTM hervorragend geeignet. Mit den Typenreihen PYROSENS LTMI und LTSI bietet die DIAS Infrared GmbH hochentwickelte pyroelektrische IR-Sensoren an, mit denen NDIR-Gasanalyse auch für geringste Gaskonzentrationen im einstelligen ppm-Bereich möglich wird. Die jeweilige Nachweisgrenze ist dabei sowohl von der Konstruktion der Messzelle als auch vom zu detektierenden Gas abhängig. Der typische Spektralbereich liegt dabei zwischen ca. 1 µm und 20 µm, unsere Sensoren sind aber selbst bei Wellenlängen weit über 100 µm einsetzbar.

PYROSENS sensors are used for leak detection or leak testing of refrigerators and air conditioning systems as well as for highly accurate and temperature stable concentration measurements of gases such as CO, CO2 and CH4 with very low cross sensitivity between CO and CO2, which are used especially in human and veterinary medicine.
In the semiconductor industry, they are used, among other things, for gas monitoring in the end-point monitoring of vacuum chamber cleaning processes.
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