US20090213381A1 - Analyzer system and optical filtering - Google Patents
Analyzer system and optical filtering Download PDFInfo
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- US20090213381A1 US20090213381A1 US12/112,401 US11240108A US2009213381A1 US 20090213381 A1 US20090213381 A1 US 20090213381A1 US 11240108 A US11240108 A US 11240108A US 2009213381 A1 US2009213381 A1 US 2009213381A1
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Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
- G01N21/274—Calibration, base line adjustment, drift correction
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N2021/3129—Determining multicomponents by multiwavelength light
- G01N2021/3133—Determining multicomponents by multiwavelength light with selection of wavelengths before the sample
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
- G01N2021/317—Special constructive features
- G01N2021/3174—Filter wheel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
- G01N21/031—Multipass arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
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- G01N2201/121—Correction signals
- G01N2201/1215—Correction signals for interfering gases
Definitions
- emissions from fossil fuel combustion facilities typically include multiple types of gases.
- emissions can include gases such as CO 2 , NO 2 , SO 2 , etc.
- Each of the different types of gases has unique optical absorption characteristics. These unique characteristics enable a corresponding gas analyzer system to positively identify whether a particular type of gas is present in a gas sample.
- Beer's law defines an empirical relationship that relates the absorption of light to properties of the material through which the light is traveling. In other words, different materials absorb different frequencies of light energy. By passing of optical energy through a gas sample and detecting which frequencies of optical energy are absorbed by the gas sample, it is possible to determine what type of gas is present in the gas sample. The amount of absorption can indicate a concentration of a respective gas.
- One conventional gas analyzer system includes an optical source that generates an optical signal for passing through a sample gas.
- Such an analyzer also includes a so-called optical filter wheel and a so-called chopper wheel.
- the optical filter wheel and the chopper are both disposed in a path of the optical signal.
- the optical filter wheel includes a number of different optical filters, each of which passes only a single frequency band of light energy. Depending on which filter is disposed in a path of the optical signal, it is known what frequency band of light is being passed through the sample. An optical detector measures how much optical energy passes though the sample.
- the chopper wheel includes multiple windows or cut-outs separated by opaque regions that block light.
- the chopper wheel is also placed in a path of the optical signal such that a position of the chopper wheel dictates whether any of the optical signal passes through the gas sample or is blocked by an opaque region. As the chopper wheel spins, it blocks and passes optical energy through the sample to a detector.
- a conventional gas analyzer system produces modulated light by setting the filter wheel in a position so that the optical signal passes through a selected filter in the optical wheel.
- a controller spins the chopper wheel to repeatedly block and pass the optical signal through the gas sample as discussed above.
- Application of the chopper wheel results in modulation of a single frequency band of optical energy depending on which filter on the filter wheel has been chosen to be “chopped” or modulated.
- a controller can produce a modulated optical signal using a two-wheel assembly including a chopper wheel and filter wheel.
- the conventional two-wheel assembly as discussed above is prone to failure because it includes many moving parts.
- such an assembly includes a filter wheel and a chopper wheel that operate independently of each other and, thus, require separate driver control logic and motors.
- Embodiments herein include a unique way to produce a modulated optical signal and collect data for detecting a presence of different types of matter in a sample chamber.
- a gas analyzer system includes an optical source, an optical filter, a controller, and an analyzer.
- the optical source generates an optical signal.
- the optical filter assembly includes different optical filters in which to filter the optical signal.
- the controller is configured to select sequential application of each of the different optical filters in a path of the optical signal to modulate the optical signal.
- the optical analyzer analyzes the modulated optical signal passing through a sample to detect which of one or more types of matter are present in the sample.
- the matter can include different types of gases, liquids, or solids present in the sample.
- an example analyzer system as described herein can determine a concentration of multiple gases present in the sample based on how much of the modulated optical signal is absorbed by the sample at different optical energies.
- the optical filter assembly can include multiple filters in which to measure absorption of optical energy.
- the gas analyzer system can identify concentrations of different types of gases in a sample even though there happens to be absorbance interference amongst the gases.
- the optical filter assembly can be an optical filter wheel including the different optical filters, each of which is separated by opaque partitions that block the optical signal from passing through the sample.
- a filter wheel can include a first filter, a second filter, a third filter, etc.
- between each filter pair is an opaque region that blocks the optical energy.
- Each filter passes different frequency bands of optical energy.
- the controller can be configured to rotate the optical wheel to each of multiple successive positions including a first position, a second position, a third position, a fourth position, a fifth position, etc. to produce the modulated optical signal.
- the first filter When in the first position, the first filter is disposed in a path of the optical signal enabling the optical signal to pass through the first optical filter and the sample to the analyzer.
- an opaque region of the optical filter wheel is disposed in a path of the optical signal to block the optical signal from passing through the sample.
- the second filter When in the third position, the second filter is disposed in a path of the optical signal enabling the optical signal to pass through the second optical filter and the sample to the analyzer.
- the third filter When in the fifth position, the third filter is disposed in a path of the optical signal enabling the optical signal to pass through the first optical filter and the sample to the analyzer. Sequentially setting the optical filter wheel in these positions as discussed herein produces the modulated optical signal for passing through the sample to detect the presence of different gases.
- This process can be repeated for any number of filters on the optical filter wheel such that the controller generates the modulated optical signal based on positioning different optical filters in a path of the optical signal.
- the analyzer collects absorption information for the frequency band. The transition from one filter to a next filter serves as a way of modulating the optical signal.
- Modulating the optical signal as described herein enables the analyzer to collect absorption data in a different manner than as discussed above for the conventional two-wheel assembly including a chopper wheel.
- the conventional two-wheel assembly lends itself to repeated sampling of the optical signal for a single filter of the filter wheel assembly based on use of the chopper wheel.
- embodiments herein enable more efficient serial collection of absorption data in a serial manner via modulation without use of a chopper wheel.
- FIG. 1 is an example diagram of an analyzer system according to embodiments herein.
- FIG. 2 is an example diagram illustrating an optical filter assembly according to embodiments herein.
- FIG. 3 is an example diagram illustrating detected intensities of light for different frequency bands according to embodiments herein.
- FIG. 4 is an example diagram illustrating collected sample data according to embodiments herein.
- FIG. 5 is an example graph illustrating absorption of energy associated with carbon dioxide over a range of wavelengths.
- FIG. 6 is an example graph illustrating absorption of energy associated with carbon monoxide over a range of wavelengths.
- FIG. 7 is an example graph illustrating energy absorption at different wavelengths for multiple different gas samples.
- FIG. 8 is an example block diagram of a computer system configured with a processor and related storage to execute different methods according to embodiments herein.
- FIGS. 9 and 10 are example flowcharts illustrating methods according to embodiments herein.
- FIG. 1 is an example diagram of an analyzer system 100 according to embodiments herein.
- analyzer system 100 includes a user 108 , an optical source 110 , optical signal 115 , optical filter assembly 120 , modulated optical signal 125 , chamber 129 , detector assembly 135 , repository 180 , sample data processor 142 , and display screen 130 .
- Optical filter assembly 120 includes multiple filters 122 such as filter 122 - 1 , filter 122 - 2 , filter 122 - 3 , filter 122 - 4 , filter 122 - 5 , filter 122 - 6 , filter 122 - 7 , filter 122 - 8 , filter 122 - 9 , filter 122 - 10 , etc.
- Chamber 129 includes inlet 127 , outlet 128 , and reflectors 131 - 1 and 131 - 2 .
- Display screen 130 displays report 145 for viewing by user 108 .
- Detector assembly 135 includes detector 136 and monitor circuit 137 .
- analyzer system 100 analyzes absorption characteristics of sample 126 as it passes from inlet 127 through chamber 129 to outlet 128 .
- the analyzer system 100 passes the modulated optical signal 125 through the sample 126 to identify a presence and/or concentrations of multiple different target gases such as H 2 O (water), CO (carbon monoxide), CO 2 (carbon dioxide), NO (nitric oxide), NO 2 (nitrogen dioxide), SO 2 (sulfur dioxide), N 2 O (nitrous oxide), CH 4 (methane), HC (hydrocarbons), etc.
- the inlet 127 of chamber 128 can be configured to receive gas sample 126 from a smokestack.
- the analyzer system 100 measures combustion by-products in sample 126 using a unique method employing non-dispersive infrared (IR) absorbance spectroscopy.
- IR infrared
- the basis of analyzing sample 126 is use of Beer-Lambert's Law. As mentioned above, this law defines a linear relationship between the concentration of a gas of interest and the amount of energy it absorbs. Via this technique, the gas analyzer 140 determines the presence and/or concentration of matter such as individual pollutants in the sample 126 based on the capacity of the compounds to absorb infrared energy of a specific wavelength.
- optical source 110 During operation, optical source 110 generates optical signal 115 .
- the optical source generates optical signal 115 in an infrared spectrum such as a broad range of optical wavelengths between 1.5 and 7.5 micrometers.
- the optical source 115 can be a device such as semiconductor device, a glowing metal filament heated to a temperature of several hundred degrees C., etc.
- the optical detector 136 is a pyroelectric detector device such as the Selex detector Type #5482 (available from SELEX S&AS, PO Box 217, Millbrook Industrial Estate, Victoria, Hampshire, UK).
- the detector device is a lead-selenide device such as the SensArray detector, part number SA-432-386T (available from SensArray Infrared, Burlington, Mass. 01803).
- filter controller 155 changes which of multiple optical filters 122 is aligned in a path of the optical signal 115 for passing of a limited frequency band of the optical signal 115 through sample 126 to detector 136 .
- the filter controller 155 produces the modulated optical signal 125 by rotating an optical filter assembly 120 to each of multiple successive positions in which the optical filters 122 pass different frequency bands of optical energy through the sample 126 .
- optical filter assembly 120 can be a filter wheel that spins in response to input by the filter controller 155 .
- the filter controller 155 rotates optical filter assembly 120 so that optical filter 122 - 1 of the optical filter assembly 120 initially lies in the path of the optical signal 115 .
- the filter 122 - 1 absorbs certain frequencies in the optical signal 115 and passes other frequencies of the optical signal 115 to sample 126 in chamber 129 .
- filter 122 - 1 moves out of the path of optical signal 115 .
- the opaque partition of the optical filter assembly 120 between filter 122 - 1 and filter 122 - 2 then temporarily blocks the optical signal 115 so that substantially little or no optical energy passes through the sample 126 in chamber 129 to detector 126 .
- the filter controller 155 continues to rotate optical filter assembly 120 so that optical filter 122 - 2 aligns in the path of the optical signal 115 .
- the filter 122 - 2 absorbs certain frequencies in the optical signal 115 and passes other frequencies of the optical signal 115 to sample 126 in chamber 129 .
- filter 122 - 2 moves out of the path of optical signal 115 .
- the opaque partition of the optical filter assembly 120 between filter 122 - 2 and filter 122 - 3 then temporarily blocks the optical signal 115 so that substantially little or no optical energy passes through the sample 126 in chamber 129 .
- the filter controller 155 continues to rotate optical filter assembly 120 so that optical filter 122 - 3 of the optical filter assembly 120 lies in the path of the optical signal 115 .
- the filter 122 - 3 absorbs certain frequencies in the optical signal 115 and passes other frequencies of the optical signal 115 to sample 126 in chamber 129 .
- analyzer system 100 Based on repeating the above sequence of blocking and filtering different portions of the optical signal 115 over time, analyzer system 100 produces modulated optical signal 125 by multiplexing different frequency bands of the optical signal 115 through the sample. Each filter 122 can pass one or more frequency bands or channels of optical energy to the optical detector 136 .
- the analyzer system 100 passes the (multi-frequency) modulated optical signal 125 through sample 126 .
- the analyzer 140 detects types of gas present in the chamber 126 as well as a concentration of the detected gases.
- the filter controller 155 can initiate spinning the optical filter assembly 120 at a rate such as thirty rotations per second.
- a rate such as thirty rotations per second.
- the detector 136 and sampling circuit 137 collects three hundred sixty intensity samples or thirty samples per each filter for each second.
- a rate of rotating the optical filter assembly 120 to collect data can vary depending on such factors as how many filters are presenting the optical filter assembly 120 , the ability of the detector 136 to take a reading, etc.
- the chamber 129 can include reflector 131 - 1 and reflector 131 - 2 to increase the optical path length of the modulated optical signal 125 as it passes through the sample 126 .
- Increasing the effective optical path length of the modulated optical signal 125 in the chamber 129 enables greater absorption of the modulated optical signal 125 when a target gas happens to be present in the chamber 129 . This results in more accurate gas type determinations and/or more accurate gas concentration readings.
- the reflectors 131 can be configured as a multi-pass cell in which the optical signal repeatedly reflects off reflector 131 - 1 and 131 - 2 prior to striking detector 136 .
- Monitor circuit 137 can include an amplifier and A/D circuit (e.g., analog to digital converter circuit) to measure a strength of the received optical signal 132 .
- the monitor circuit 137 samples the intensity of the detector 136 to produce sample data 138 .
- detector assembly 135 then stores intensity readings associated with optical signal 132 as sample data 138 in repository 180 .
- an output signal 305 such as the output voltage of the detector 136 varies depending on how much energy is present in the optical signal 132 .
- Monitor circuit 137 can include an amplifier and A/D circuit (e.g., analog to digital converter circuit) to measure a strength of the received optical signal 132 .
- the detector assembly 135 can be configured to detect peak values and trough values associated with the optical signal 132 as illustrated in FIG. 3 .
- peaks and troughs provide a relative measure of how much of the optical energy at the different frequency bands has been absorbed by the sample 126 .
- the sample data processor 142 of analyzer 140 processes the sample data 138 such as peak and trough information at the different frequency bands to identify which, if any, types of gases are present in the chamber 129 as well as concentrations of the gases. Via report 145 on display screen 130 , the analyzer 140 can indicate the different types of gases and concentrations in the sample 126 for viewing by user 108 .
- a benefit of sequentially collecting data in the different frequency bands is the ability to more accurately detect a presence of fast moving gases in chamber 126 .
- conventional methods include setting a filter in a path of an optical signal and chopping the frequency with a so-called chopper wheel as discussed above.
- a fast moving gas of a particular type may not be detected because the conventional analyzer did not sample the appropriate frequency bands while the fast passing gas was present in a sample chamber.
- Embodiments herein include sequentially collecting data from different frequency bands. In such embodiments, a fast passing gas in the chamber 129 is more likely to be detected by the analyzer 140 because the frequency bands are changed more frequently.
- FIG. 2 is a diagram illustrating an example filter assembly 120 for filtering optical signal 115 and producing modulated optical signal 125 according to embodiments herein.
- optical filter assembly 120 includes multiple filters 122 including reference filter 122 - 1 , reference filter 122 - 2 , filter 122 - 3 , filter 122 - 4 , filter 122 - 5 , filter 122 - 6 , filter 122 - 7 , filter 122 - 8 , filter 122 - 9 , filter 122 - 10 , filter 122 - 11 , and filter 122 - 12 .
- Opaque regions 220 such as opaque region 220 - 1 , opaque region 220 - 2 , opaque region 220 - 3 , block optical energy from passing through sample 126 .
- optical filter assembly 120 can include any practical number of filters.
- Each of the filters 122 can be chosen so that it is possible for the analyzer 140 to identify which, if any, types of the target type gases are present in the sample 126 passing through the chamber 129 .
- the target gases can include gases such as H 2 O (water), CO (carbon monoxide), CO 2 (carbon dioxide), NO (nitric oxide), NO 2 (nitrogen dioxide), SO 2 (sulfur dioxide), N 2 O (nitrous oxide), CH 4 (methane), HC (hydrocarbons), etc.
- the filters 122 can be configured as follows:
- Each of reference filter 122 - 1 and reference filter 122 - 2 can be configured to have a center wavelength of approximately 3.731 micrometers +/ ⁇ 2 percent.
- the filter 122 - 1 can have an FWHM (Full Width at Half Maximum) of 0.08 micrometers.
- FWHM Full Width at Half Maximum
- the filter 122 - 1 passes a wavelength band or range of energy centered around 3.731 micrometers.
- the center wavelength value of filter 122 - 1 such as 3.731 micrometers is chosen such that the filter passes a range of energy wavelengths that are not absorbed by any of the target gases except water, which tends to absorb energy in every channel.
- Use of such reference channels i.e., filter 122 - 1 and filter 122 - 2 ) serve as a way to correct for drift associated with other channels in the analyzer system 100 .
- Drift can be caused by factors such as changes in the intensity of the optical signal 115 produced by 115 over time, changes in the detector and its ability to detect optical signal 132 over time, etc. If used for correction of drift, the readings produced by the analyzer system 100 typically will be more accurate.
- Filter 122 - 3 can be configured to have a center wavelength of approximately 2.594 micrometers +/ ⁇ 2 percent.
- the filter 122 - 2 can also have an FWHM (Full Width at Half Maximum) of +/ ⁇ 15 percent of the center wavelength.
- the filter 122 - 3 passes a wavelength band or range of energy centered around 2.594 micrometers. This frequency band is at least partially absorbed by H 2 O when present in the sample 126 .
- gases that absorb energy in this range, and which are possibly present in sample 126 include: CO (carbon monoxide), CO 2 (carbon dioxide), and N 2 O (nitrous oxide).
- Filter 122 - 4 can be configured to have a center wavelength of approximately 4.630 micrometers +/ ⁇ 2 percent.
- the filter 122 - 4 can also have an FWHM (Full Width at Half Maximum) of +/ ⁇ 15 percent.
- the filter 122 - 4 passes a wavelength band or range of energy centered around 4.630 micrometers.
- This frequency band is at least partially absorbed by CO (carbon monoxide) when present in the sample 126 .
- gases that absorb energy in this range, and which are possibly present in sample 126 include: H 2 O (water) and N 2 O (nitrous oxide).
- Filter 122 - 5 can be configured to have a center wavelength of approximately 4.843 micrometers +/ ⁇ 2 percent.
- the filter 122 - 5 can also have an FWHM (Full Width at Half Maximum) of +/ ⁇ 15 percent of the center wavelength.
- the filter 122 - 5 passes a wavelength band or range of energy centered around 4.843 micrometers.
- This frequency band is at least partially absorbed by CO 2 (carbon dioxide) when present in the sample 126 .
- gases that absorb energy in this range, and which are possibly present in sample 126 include: CO (carbon monoxide), NO (nitric oxide), and SO 2 (sulfur dioxide).
- Filter 122 - 6 can be configured to have a center wavelength of approximately 5.25 micrometers +/ ⁇ 2 percent.
- the filter 122 - 6 can also have an FWHM (Full Width at Half Maximum) of +/ ⁇ 15 percent of the center wavelength.
- the filter 122 - 6 when the filter 122 - 6 is positioned in a path of the optical signal 115 , the filter 122 - 6 passes a wavelength band or range of energy centered around 5.25 micrometers. This frequency band is at least partially absorbed by NO (nitric oxide) when present in the sample 126 .
- NO nitric oxide
- gases that absorb energy in this range, and which are possibly present in sample 126 include: H 2 O (water), CO 2 (carbon dioxide), and NO 2 (nitrogen dioxide).
- Filter 122 - 7 can be configured to have a center wavelength of approximately 6.211 micrometers +/ ⁇ 2 percent.
- the filter 122 - 7 can also have an FWHM (Full Width at Half Maximum) of +/ ⁇ 15 percent of the center wavelength.
- the filter 122 - 7 passes a wavelength band or range of energy centered around 6.211 micrometers. This frequency band is at least partially absorbed by NO 2 (nitrogen dioxide) when present in the sample 126 .
- NO 2 nitrogen dioxide
- gases that absorb energy in this range, and which are possibly present in sample 126 include: H 2 O (water), CO (carbon monoxide), NO (nitric oxide), SO 2 (sulfur dioxide), and N 2 O (nitrous oxide).
- Filter 122 - 8 can be configured to have a center wavelength of approximately 8.696 micrometers +/ ⁇ 2 percent.
- the filter 122 - 8 can also have an FWHM (Full Width at Half Maximum) of +/ ⁇ 15 percent of the center wavelength.
- the filter 122 - 8 passes a wavelength band or range of energy centered around 8.696 micrometers.
- This frequency band is at least partially absorbed by SO 2 (sulfur dioxide) when present in the sample 126 .
- SO 2 sulfur dioxide
- gases that absorb energy in this range, and which are possibly present in sample 126 include: CO (carbon monoxide), NO 2 (nitrogen dioxide), and N 2 O (nitrous oxide).
- Filter 122 - 9 can be configured to have a center wavelength of approximately 7.831 micrometers +/ ⁇ 2 percent.
- the filter 122 - 9 can also have an FWHM (Full Width at Half Maximum) of +/ ⁇ 15 percent of the center wavelength.
- the filter 122 - 9 passes a wavelength band or range of energy centered around 7.831 micrometers.
- This frequency band is at least partially absorbed by N 2 O (nitrous oxide) when present in the sample 126 .
- gases that absorb energy in this range, and which are possibly present in sample 126 include: SO 2 (sulfur dioxide).
- Filter 122 - 10 can be configured to have a center wavelength of approximately 3.236 micrometers +/ ⁇ 2 percent.
- the filter 122 - 10 can also have an FWHM (Full Width at Half Maximum) of +/ ⁇ 15 percent of the center wavelength.
- the filter 122 - 10 passes a wavelength band or range of energy centered around 3.236 micrometers. This frequency band is at least partially absorbed by CH 4 (methane) when present in the sample 126 .
- gases that absorb energy in this range, and which are possibly present in sample 126 include: H 2 O (water), SO 2 (sulfur dioxide), and N 2 O (nitrous oxide).
- Filter 122 - 11 can be configured to have a center wavelength of approximately 3.367 micrometers +/ ⁇ 2 percent.
- the filter 122 - 11 can also have an FWHM (Full Width at Half Maximum) of +/ ⁇ 15 percent of the center wavelength.
- the filter 122 - 11 passes a wavelength band or range of energy centered around 3.367 micrometers.
- This frequency band is at least partially absorbed by HC (hydrocarbons) when present in the sample 126 .
- gases that absorb energy in this range, and which are possibly present in sample 126 include: H 2 O (water), NO 2 (nitrogen dioxide), SO 2 (sulfur dioxide), and N 2 O (nitrous oxide).
- Filter 122 - 12 can be configured to have a center wavelength of approximately 3.896 micrometers +/ ⁇ 2 percent.
- the filter 122 - 12 can also have an FWHM (Full Width at Half Maximum) of +/ ⁇ 15 percent of the center wavelength.
- the filter 122 - 12 passes a wavelength band or range of energy centered around 3.896 micrometers. This frequency band is at least partially absorbed by N 2 O when present in the sample 126 .
- gases that absorb energy in this range, and which are possibly present in sample 126 include: H 2 O (water), NO 2 (nitrogen dioxide) and SO 2 (sulfur dioxide).
- filters 122 can be any values that allow passing of bands of optical energy that can be absorbed by sample 126 and aid in discerning which of multiple gases are present in the sample 126 .
- FIG. 3 is an example diagram illustrating intensities of optical energy for different frequency bands according to embodiments herein.
- detector 136 senses a magnitude of light energy in a respective frequency band depending on which filter is in the path of optical signal 115 .
- Signal 305 such as an output voltage of the detector 136 represents a measure of how much optical energy is detected by detector 136 .
- sample 126 absorbs a certain portion of optical energy passed by a respective filter depending on which of one or more types of gases are present in sample 126 .
- the light-blocking region of optical filter assembly 120 between filter 122 - 12 and filter 122 - 1 passes the path of optical signal 115 . Because the signal is being blocked during such time, the intensity of signal 305 decreases.
- one or more reference filters of the optical filter assembly have a center wavelength selected to minimize absorbance due to flue gas/sample.
- the light-blocking region or opaque region of optical filter assembly 120 between filter 122 - 1 and filter 122 - 2 passes the path associated with optical signal 115 . Because the optical signal 115 is being blocked during such time, the intensity of signal 305 decreases.
- the reference filter 122 - 2 passes the path of optical signal 115 . Because a respective frequency band of optical signal 115 passes though filter 122 - 2 during such time, the intensity of signal 305 increases.
- the light-blocking region or opaque region of optical filter assembly 120 between filter 122 - 2 and filter 122 - 3 passes the path of optical signal 115 . Because the optical signal 115 is blocked during such time, the intensity of signal 305 decreases.
- filter 122 - 3 passes the path of optical signal 115 . Because a respective frequency band of optical signal 115 passes though filter 122 - 3 during such time, the intensity of signal 305 increases. As previously discussed, the amount of optical energy detected by detector 136 will vary depending on how much of the optical signal is absorbed by sample 126 .
- the analyzer 140 repeats the same sequence of filtering for each following cycle 2, 3 and so on.
- the monitor circuit 137 samples signal 305 to produce sample data 138 as in FIG. 4 .
- An intensity reading for a given filter 122 can be a measure between a peak and subsequent valley or between a valley and subsequent peak of signal 305 .
- the intensity can be measured by tracking the rate at which the signal changes when optical filters and opaque areas sequentially pass in front of the source.
- the monitor circuit 137 can be configured to measure the optical energy in a frame such as when filter 122 - 1 passes in a path of optical signal 115 by repeated sampling of signal 305 to identify the lowest value of the signal 305 , which occurs around time T 1 .
- the identified low value represents a valley and relative “zero” of the detector 136 for filter 122 - 1 .
- the monitor circuit 137 also monitors signal 305 in the frame to identify a subsequent highest value of the signal 305 , which occurs at around time T 2 .
- the high value represents a peak for filter 122 - 1 .
- a difference in the signal 305 values between this peak and the valley pair represents a measure of how much optical energy is detected by the detector 136 for the given filter.
- the monitor circuit 137 can be configured to measure the optical energy in a frame such as when filter 122 - 2 passes in a path of optical signal 115 by repeated sampling of signal 305 to identify the lowest value of the signal 305 , which occurs around time T 3 .
- the identified low value represents a valley and relative “zero” of the detector 136 for filter 122 - 2 .
- the monitor circuit 137 also monitors signal 305 to identify a subsequent highest value of the signal 305 , which occurs at around time T 2 .
- the high value represents a peak for filter 122 - 2 .
- a difference in the signal 305 between this peak and the valley pair represents a measure of how much optical energy is detected by the detector 136 for filter 122 - 2 .
- This monitor circuit 137 can be configured to repeat sampling of signal 305 for each of the different filters 122 on a continuous basis so that the analyzer system 100 continuously monitors the presence of different gases in sample 126 as it passes from inlet 127 through chamber 129 to outlet 128 . Note again that measuring the optical energy between peak-valley pairs or valley-peak pairs to determine an absorbance of optical energy is shown by way of a non-limiting example only and that the signal 305 can be processed in a number of different ways to detect how much of the optical signal 115 passes through the sample 126 and/or how much is absorbed by the sample 126 .
- FIG. 4 is an example diagram illustrating sample data 138 according to embodiments herein.
- sample data 138 - 1 includes intensity readings associated with signal 305 for each of the filters 122 for cycle # 1
- sample data 138 - 2 includes intensity readings associated with signal 305 for each of the filters 122 for cycle #2, and so on.
- Sample data such as data 11 , data 12 , etc. for each successive filter 122 represents data collected by monitor circuit 137 .
- data sample 138 - 1 can include sample information collected during cycle # 1 .
- data 11 can include a pair of peak-valley readings for reference filter 122 - 1 in cycle # 1
- data 12 can include a pair of peak-valley readings for reference filter 122 - 2 in cycle # 1
- data 13 can include a pair of peak-valley readings for filter 122 - 3 in cycle #1, and so on.
- data sample 138 - 2 can include sample information collected during cycle # 2 .
- data 21 can include a pair of peak-valley readings for reference filter 122 - 1 in cycle # 2
- data 22 can include a pair of peak-valley readings for reference filter 122 - 2 in cycle # 2
- data 23 can include a pair of peak-valley readings for filter 122 - 3 in cycle #2, and so on.
- the monitor circuit 137 can store sample data for each of the cycles.
- the monitor circuit 137 can store sample data 138 in any of multiple different ways. For example, in one embodiment, the monitor circuit 137 collects the peak and valley values for each of the different filters 122 for cycle # 1 and stores the sample data in repository 180 . In following cycle # 2 , the monitor circuit 137 collects peak and valley values for each of the different filters 122 for cycle # 2 and adds the collected peak and valley values for cycle # 2 to those for cycle # 1 .
- the monitor circuit 137 repeats this process of collecting and summing the sample data such that, after K cycles, the sample data 138 in repository 180 includes a summation of K peak samples and a summation of K valley samples for filter 122 - 1 , a summation of K peak samples and a summation of K valley samples for filter 122 - 2 , a summation of K peak samples and a summation of K valley samples for filter 122 - 3 , a summation of K peak samples and a summation of K valley samples for filter 122 - 4 , and so on.
- the analyzer 140 uses the collected sample data 138 to identify which type of matter such as gases are present in sample 126 and/or a concentration of the gases.
- FIG. 5 is an example graph 500 illustrating absorption of energy associated with carbon monoxide over a range of wavelengths. As shown, carbon monoxide absorbs optical energy in the range of optical wavelengths approximately between 4.4 and 4.8 micrometers.
- FIG. 6 is an example graph 600 illustrating absorption of energy associated with carbon dioxide over a range of wavelengths. As shown, carbon dioxide absorbs optical energy in the range of optical wavelengths approximately between 4.2 and 4.5 micrometers.
- FIG. 7 is an example graph 700 illustrating energy absorption at different wavelengths for multiple different gases such as gas X, gas Y, and gas Z, potentially present in sample 126 passing through chamber 129 . Note that this is only an example illustration of different gases and how they can absorb optical energy in the same wavelengths and thus “interfere” with each other.
- gases can absorb optical energy at around the same wavelengths.
- gas Y and gas Z both absorb optical energy in a range of wavelength values around wavelength W 2 .
- gas Y and gas Z both absorb optical energy in a range of wavelength values around wavelength W 3 .
- the following discussion presents an example of how to convert detected optical intensity values such as those in sample data 138 to one or more corresponding concentration measurements of gases present in sample 126 .
- the first step is to determine the amount of energy that was absorbed by the gas sample. This is called the Absorbance, and it is defined as the log of the ratio of the intensity measured when there is no sample present (the Zero Intensity) divided by the intensity measured when the sample is present (Sample Intensity).
- A is the absorbance
- I o is the intensity measured while sampling high purity zero air
- I s the intensity measured while sampling the gas of interest.
- the absorbance is a direct measure of concentration. Also, absorbance values are additive, so if two different gases both cause some attenuation or absorbance of the modulated optical signal 125 for a given filter 122 , the total absorbance at that wavelength is the sum of the individual absorbance for each of the gases. This is referred to as interference. Analyzer 140 corrects for cross interferences between channels as discussed below.
- the analyzer 140 can be calibrated in accordance with a calibration procedure that establishes the relationship between the measured absorbance and the concentration of the target compound in the sample 126 .
- the analyzer 140 records the detected signal for such a gas.
- calibration includes calibrating the analyzer 140 at each of multiple different concentrations for each gas of interest that may be present in sample 126 .
- A absorbance
- ⁇ is the absorptivity of the gas of interest
- b is the sample pathlength as a result of reflections between reflectors 131
- C is the concentration of the gas of interest.
- the analyzer 140 can be calibrated using multipoint calibration, using high purity zero air and a series of different concentration of span gases in a factory setting.
- field calibration procedures may be different than factory calibration procedures.
- a so-called field zero procedure or calibration performed in the field can be similar to the factory zero as discussed above, except there is no assumption that the so-called “zero” air will be free of water.
- the calibration procedure can include measuring a single target sample at a known concentration as the non-linearity detected during the factory calibration is repeatable.
- the reference wavelength for filter 122 - 1 and filter 122 - 2 is selected at a point in the optical spectrum where none of the possible target gases in the sample 126 is expected to cause absorbance. Changes in the intensity of the modulated optical signal 125 measured at the reference wavelength are assumed to occur because of fluctuations in behavior of the hardware such as the source 110 and detector 136 and are assumed to occur to the same degree in both the reference channels and sample channels.
- Reference channels refer to sampling of the modulated optical signal 125 via use of filter 122 - 1 and filter 122 - 2 .
- Sample channels refer to sampling of the modulated optical signal 125 via use of filter 122 - 3 , filter 122 - 4 , etc.
- FIG. 8 is a block diagram of an example architecture of a respective computer system 810 such as one or more computers, processes, etc., for implementing analyzer 140 according to embodiments herein.
- Computer system 810 can include one or more computerized devices such as personal computers, workstations, portable computing devices, consoles, network terminals, networks, processing devices, etc.
- computer system 810 can include one or multiple computers that carry out the processing as described herein.
- computer system 810 of the present example includes an interconnect 811 coupling memory system 812 , a processor 813 , I/O interface 814 , and a communications interface 817 .
- I/O interface 814 provides connectivity to peripheral devices such as repository 180 and other devices 816 (if such devices are present) such as a keyboard, mouse (e.g., selection tool to move a cursor), display screen 130 , etc.
- peripheral devices such as repository 180 and other devices 816 (if such devices are present) such as a keyboard, mouse (e.g., selection tool to move a cursor), display screen 130 , etc.
- Communications interface 817 enables the analyzer application 140 - 1 of computer system 810 to communicate over network 190 and, if necessary, retrieve data, update information, etc., from different sources.
- memory system 812 can be encoded with instructions associated with analyzer application 140 - 1 .
- the instructions support functionality as discussed above and as discussed further below.
- the analyzer application 140 - 1 (and/or other resources as described herein) can be embodied as software code such as data and/or logic instructions on a tangible and/or intangible computer readable medium, media, etc. such as memory or on another computer readable medium that supports processing functionality according to different embodiments described herein.
- processor 813 accesses memory system 812 via the use of interconnect 811 in order to launch, run, execute, interpret or otherwise perform the logic instructions of the analyzer application 140 - 1 .
- Execution of the analyzer application 140 - 1 produces processing functionality in analyzer process 140 - 2 .
- the analyzer process 140 - 2 represents one or more portions of the analyzer 140 performing within or upon the processor 813 in the computer system 810 .
- the analyzer application 140 - 1 itself such as the un-executed or non-performing logic instructions and/or data, etc.
- the analyzer application 140 - 1 may be stored on a computer readable medium such as a floppy disk, hard disk or in an optical medium.
- the analyzer application 140 - 1 can also be stored in a memory type system such as in firmware, read only memory (ROM), or, as in this example, as executable code within the memory system 812 (e.g., within Random Access Memory or RAM).
- FIG. 9 is an example flowchart 900 illustrating operations associated with analyzer 140 according to embodiments herein. Note that flowchart 900 of FIG. 9 and corresponding text below may overlap with and refer to some of the matter previously discussed with respect to FIGS. 1-8 . Also, note that the steps in the below flowcharts need not always be executed in the order shown.
- step 910 the analyzer 140 generates an optical signal 115 to pass through a sample 126 .
- step 915 the analyzer 140 selects application of each of different optical filters 122 in a path of the optical signal 125 to produce modulated optical signal 125 .
- step 920 the analyzer 140 analyzes the modulated optical signal 125 after passing of the modulated optical signal 125 through the sample 126 to detect which of multiple possible target gases are present in the sample 126 .
- FIG. 10 is an example flowchart 1000 illustrating operations associated with analyzer 140 according to embodiments herein. Note that flowchart 1000 of FIG. 10 and corresponding text below may overlap with and refer to some of the matter previously discussed with respect to FIGS. 1-9 . Also, note that the steps in the below flowcharts need not always be executed in the order shown.
- step 1010 the analyzer 140 generates an optical signal 115 in an infrared frequency range.
- the analyzer 140 selects application of each of different optical filters 122 in a path of the optical signal 115 to produce modulated optical signal 125 .
- Selecting the different filters 122 can include successive positioning of different optical filters 122 and opaque partitions 220 in the path of the optical signal 115 .
- each of the different optical filters 122 can be configured to pass a different optical frequency band of the optical signal 115 through the sample 126 .
- the analyzer 140 disposes a first optical filter such as filter 122 - 2 in the path of the optical signal 115 for a duration of time.
- the optical filter 122 - 2 is configured to pass a first optical frequency energy band of the optical signal 115 through the sample 126 .
- the analyzer 140 disposes a second optical filter such as filter 122 - 3 in the path of the optical signal for a duration of time.
- the second optical filter can be configured to pass a second optical frequency energy band of the optical signal through the sample 126 .
- the analyzer 100 can dispose a third optical filter such as filter 122 - 4 in the path of the optical signal 115 for a duration of time.
- the third optical filter can be configured to pass a third optical frequency energy band of the optical signal through the sample 126 .
- the analyzer 140 Based on repeatedly passing the filter 122 in a path of the optical signal 115 , the analyzer 140 produce modulated optical signal 125 .
- step 1050 the analyzer 140 analyzes the modulated optical signal 125 after passing of the modulated optical signal 125 through the sample 126 to detect which of multiple gases are present in the sample 126 .
- step 1060 for each of multiple filters, the analyzer 100 detects an amount of optical energy in the modulated optical signal 125 after passing of the optical energy through the sample 126 for each of the multiple filters 122 .
- the analyzer 140 determines a concentration of one or more gases present in the sample based on how much of the modulated optical signal 125 is absorbed by the sample 126 at different optical energies.
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EP09713570.1A EP2252877A4 (de) | 2008-02-21 | 2009-02-19 | Gasanalysatorsystem |
CN200980114720.8A CN102016550B (zh) | 2008-02-21 | 2009-02-19 | 气体分析仪系统 |
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US12/112,401 US20090213381A1 (en) | 2008-02-21 | 2008-04-30 | Analyzer system and optical filtering |
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Also Published As
Publication number | Publication date |
---|---|
US20090213380A1 (en) | 2009-08-27 |
EP2252877A2 (de) | 2010-11-24 |
CN102016550B (zh) | 2012-12-19 |
WO2009105571A3 (en) | 2016-04-14 |
WO2009105571A2 (en) | 2009-08-27 |
EP2252877A4 (de) | 2016-08-31 |
US7835005B2 (en) | 2010-11-16 |
CN102016550A (zh) | 2011-04-13 |
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