EP2715291A2 - Réétalonnage de capteurs de gaz non dispersif à absorption dans l'infrarouge (ndir) sollicités par absorption - Google Patents

Réétalonnage de capteurs de gaz non dispersif à absorption dans l'infrarouge (ndir) sollicités par absorption

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Publication number
EP2715291A2
EP2715291A2 EP12794011.2A EP12794011A EP2715291A2 EP 2715291 A2 EP2715291 A2 EP 2715291A2 EP 12794011 A EP12794011 A EP 12794011A EP 2715291 A2 EP2715291 A2 EP 2715291A2
Authority
EP
European Patent Office
Prior art keywords
gas
sensor
ndir
gas sensor
ratio
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12794011.2A
Other languages
German (de)
English (en)
Other versions
EP2715291A4 (fr
Inventor
Jacob Y. Wong
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Airware Inc
Original Assignee
Airware Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US13/149,738 external-priority patent/US8178832B1/en
Priority claimed from US13/348,568 external-priority patent/US8222606B1/en
Priority claimed from US13/420,323 external-priority patent/US8217355B1/en
Application filed by Airware Inc filed Critical Airware Inc
Publication of EP2715291A2 publication Critical patent/EP2715291A2/fr
Publication of EP2715291A4 publication Critical patent/EP2715291A4/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • 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
    • 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
    • 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
    • G01N21/59—Transmissivity
    • G01N21/61—Non-dispersive gas analysers
    • 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
    • G01N2201/06—Illumination; Optics
    • G01N2201/066—Modifiable path; multiple paths in one sample
    • G01N2201/0662—Comparing measurements on two or more paths in one sample
    • 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
    • G01N2201/12—Circuits of general importance; Signal processing
    • G01N2201/127—Calibration; base line adjustment; drift compensation
    • G01N2201/12746—Calibration values determination

Definitions

  • the present invention is in the field of measuring instruments, and specifically relates to re-calibrating non-dispersive infrared (NDIR) gas sensors whose outputs have drifted over time and no longer correctly reflect their measurement accuracy.
  • NDIR non-dispersive infrared
  • the dual-beam NDIR gas sensor is of an Absorption Biased ("AB " ) designed type that uses an identical spectral narrow band pass filter for wavelength selection for both the Signal channel and the Reference channel.
  • the dual-beam NDIR gas sensor has no moving parts for effecting the interposition of spectral fitters, an absorbing cell or a non-absorbing ceil to create both the Signal channel and the Reference channel,
  • a re-calibration method is described in which the output P of an AB designed NDIR gas sensor is compared to a second gas concentration of the sample gas P c determined by a Calibration Master, itself an AB designed NDIR gas sensor, in the close environ of the sensor to be re-calibrated. If the difference between P and P c exceeds a preselected threshold, the calibration curve of the sensor can be adjusted by adjusting its Go value based upon a reversed calibration curve algorithm.
  • the recalibration method can use a master NDIR gas sensor which itself is an AB designed NDIR gas sensor which obtains an air sample from a close environ air space proximate the sample chamber of the NDIR gas sensor being recalibrated through the use of an air sampler.
  • An AB designed gas sensor can also be self-recalibrated by using a stored standard gamma ratio and a measured standard gamma ratio and a self- calibration algorithm to correct the calibration curve for a difference between the stored standard gamma ratio and the measured standard gamma ratio when their difference exceeds a preselected threshold.
  • the stored standard gamma ratio and the measured standard gamma ratio are obtained at different points of time, the standard gamma ratio being the ratio of signal to reference outputs from a standard signal detector located in the Signal channel and a standard reference detector located in the Reference channel.
  • the standard signal and reference detectors are equipped with an identical narrow band pass filter with the same Center Wavelength ("CWL”) and Full Width Half Maximum (FWHM) neutral to the absorption of the gas of interest.
  • CWL Center Wavelength
  • FWHM Full Width Half Maximum
  • G 0 the standard gamma is independent of the amount of gas of interest present in the sample chamber of the sensor and its value changes only when changes in the sensor components are detected.
  • the standard gamma can therefore be used proportionally to correct for the changes in the value of G 0 , thereby readjusting the calibration curve and rendering the sensor to be self-calibrating over time.
  • Figure 1 shows the optical component layout for the Absorption Biased methodology for DIR gas sensors.
  • Figure 2 shows respectively the output curves for the Reference and Signal channel detectors as a function of C0 2 in the sensor sample chamber.
  • Figure 3 shows the ratio of the output of the Signal channel detector over the Reference channel detector output at sensor block temperature ⁇ as a function of C0 2 in the sensor sample chamber.
  • Figure 4 shows the normalized ratio of the output of the Signal channel detector over the output of the Reference channel detector at sensor block temperature B T as a function of C0 2 in the sensor sample chamber.
  • Figure 5 depicts the sensor calibration curve expressed the C0 2 concentration in the sample chamber for the Absorption Biased (AB) NDIR gas sensing methodology as a third order polynomial of the normalized ratio of signal output/reference output.
  • AB Absorption Biased
  • Figure 6 depicts the sensor reverse calibration curve expressed the normalized ratio of signal output reference output for the Absorption Biased (AB) NDIR gas sensing methodology as a third order polynomial of the C0 2 concentration in the sample chamber.
  • AB Absorption Biased
  • Figure 7 portrays a typical scenario wherein an Absorption Biased (AB) designed NDIR gas sensor is being recalibrated by a Calibration Master using the Effortless Recalibration (ERC) technique without the use of an air sampler.
  • Figure 8 portrays a typical scenario wherein an Absorption Biased (AB) designed NDIR gas sensor is being recalibrated by a Calibration Master using the Effortless Recalibration (ERC) technique with the use of an air sampler.
  • Figure 9 depicts the component layout and construct of a specially designed air sampler guaranteeing at all times the accuracy of using the ERC technique to recalibrate an AB designed NDIR gas sensor with a Calibration Master.
  • Figure 10 shows the details of an air-tight telescopic tube which is part of the specially designed air sampler.
  • Figure 1 1 depicts the optical component layout for a self-commissioning
  • the present invention only applies to NDIR gas sensors and not to other technology types of gas sensors.
  • the present invention builds upon the inventor's earlier disclosure of an Absorption Biased (AB) methodology for NDIR gas sensors set forth in U.S. Patent No. 8,143,581 , the disclosure of which is specifically incorporated herein by reference.
  • This AB methodology can be reviewed briefly as follows. First of all, this methodology is based upon a conventional Double Beam Configuration Design for NDIR gas sensors. Two channels or beams are set up, one labeled Signal and the other Reference. Both channels share a common infrared source but have different detectors, each of which is equipped with the same or identical narrow band-pass filter used to spectrally define and detect the target gas of interest.
  • Both detectors for the two channels share the same thermal platform with each other and also with the sample chamber and the common infrared source mount for the sensor.
  • An absorption bias is deliberately established between the Signal and Reference channels by having the sample chamber path length longer for the Signal channel than that for the Reference channel. By so doing, the detector output of the Reference channel is always greater than that of the Signal channel when there is target gas present in the sample chamber. This is due to the fact that there is more absorption taken place in the Signal channel because of its longer sample chamber path length.
  • FIG 1 shows the optical component layout for the Absorption Biased methodology for NDIR gas sensors.
  • both the signal channel detector 1 and the reference channel detector 2 are entrapped with 100% dry nitrogen 3 and have the same narrow band-pass spectral filter 4 which is used to detect the gas of Interest in the sample chamber 5.
  • both detectors 1 and 2 are thermally connected to the entire sensor body 6 through their respective waveguides 7 and 8 and consequently they always share the same thermal platform with each other.
  • the entire sensor body 6, which is in essence a composite of aluminum parts comprising the infrared source mount 9, sample chamber 5 and the waveguides 7 and 8, respectively, for the signal and reference channels, provides an excellent common thermal platform for detectors 1 and 2.
  • the sample chamber path length L R , 10, associated with the reference channel is approximately one-half of the sample chamber path length L s , 11 , associated with the signal channel.
  • a common infrared source 12 is used to illuminate both the signal and the reference channels.
  • the output of detector 1 for the signal channel is always less than that of the detector 2 for the reference channel irrespective whether or not there is any amount of the gas of interest in the sample chamber 5.
  • the respective detector outputs can be determined by using the well-known Beer-Lambert Absorption Law for the particular gas of interest, the designed characteristics for the narrow band-pass filter 4 and the physical dimensions of L R 10 and L s 1 1.
  • any changes in the calibration curve for an AB designed NDIR gas sensor will only be reflected in the changing value of G 0 over time. It will not be reflected in the Physics measurement principle of such an NDIR gas sensor, which is supposed to always remain invariant. If the output of the infrared source for any NDIR gas sensor is changing spectrally over time due to whatever reason, and it is delivered to the Signal and Reference channel detectors, and these detectors have different spectral narrow band-pass filters, this changing spectral output of the source will destroy the invariance of the absorption Physics treatment for the sensor. This is because the ratio of the two channels at the very beginning establishes spectrally the absorption Physics for the gas measurement based upon the spectral output of the source. Such is actually the case for non-AB designed Double Beam NDIR gas sensors since the Signal and the Reference channel detectors, unlike the AB-designed gas sensors, each has its own and different spectral narrow band-pass filters instead of identical ones.
  • Figure 2 shows the graph 13 depicting the output V R (B T ) of the reference channel detector 2 as a function of C0 2 concentrations in the sample chamber 5.
  • Graph 14 of Figure 2 shows the output V S (B T ) of the signal channel detector 1 as a function of C0 2 concentrations in the same sample chamber. Note that both outputs of the detectors are individually a function of the sensor block temperature BT, which is linked to ambient temperature T wherein the sensor is located. Since the signal channel path length is longer than that for the reference channel, V S (BT) changes more than V R (B T ) for any amount of C0 2 in the sample chamber 5.
  • G(BT) V S (B T ) / V R (B T )
  • Such a functional relationship between G(BT) and the C0 2 concentrations in sample chamber 5 is the de facto calibration curve for the sensor as depicted by graph 15 in Figure 3 for a particular sensor block temperature B T .
  • the value of G(B T ) depends on sensor block temperature B T and B T must therefore be kept unchanged during calibration for the sensor when concentrations of C0 2 are made to vary in sample chamber 5 in order to obtain corresponding G(B T ) values.
  • G(B T ) the value of G(B T ), other than being dependent upon the value of C0 2 concentration in the sample chamber of the sensor and its block temperature B T , is invariant over time since both the signal and reference channels of the sensor have similar detectors with identical spectral filters and share the same thermal platform at B T .
  • the value of G(B T ) is governed only by the NDIR gas absorption Physics for a particular gas of interest and is therefore invariant over time.
  • it is hot quite exact in reality. This is because the components of the sensor will not be time invariant and their performance characteristics can and will inevitably change over time.
  • the Absorption Biased methodology recognizes two distinct domains that constitute the sensor's realistic calibration curve.
  • the first is the invariant NDIR gas absorption Physics domain discussed before and the second is the variant sensor component characteristics domain discussed below.
  • the variant sensor component characteristics domain is represented by value of G(BT) when there is no gas of interest present in the sensor's sample chamber or
  • G Q (BT) VS(B T ) / VR(B T ) ... 0 concentration of gas of interest
  • n 3 or the third order as depicted by graph 17 in Figure 5).
  • the same plotted data can also be used to generate the inverse de facto calibration curve for the sensor or XP[P(ppm)] linking C0 2 gas concentration in the sample chamber P(ppm) to the value of ⁇ ( ⁇ ).
  • P(ppm) By plugging in the value of P(ppm) into the function XP, one can get the value of x(B T ) or
  • XP[P(ppm)i can also be expressed as a third order polynomial of P(ppm) as depicted in graph 18 of Figure 6.
  • the value of G(B T ) is invariant as far as the gas absorption Physics is concerned.
  • G 0 (B T ) is also dependent upon B T , the calibration curve as shown in Equation (1 ) above for the sensor combining both the invariant Physics domain and the variant sensor components domain is valid only if G(B T ) and Go(B T ) are measured at the same temperature of B T .
  • G(B T ) can be determined at any temperature ⁇ as long as G 0 (B T ) is also determined at the same temperature for determining x(B T ). Because of this fact, we must determine G 0 (B T ) as a function of B T or
  • the gas concentration in the immediate neighborhood or surrounding of the sensor to be re-commissioned or recalibrated will first be accurately determined by a "Calibration Master".
  • This so-called “Calibration Master” is a gas sensor that must live up to its name as being able to measure accurately the gas concentration in the vicinity of the sensor to be re-commissioned or recalibrated.
  • the Calibration Master can be another gas sensor whose accuracy has been checked or re-calibrated prior to the time it is being used by its operator to make rounds checking multiple gas sensors.
  • This information is then sent wirelessly via WiFi or via infrared under direct visual contact from the "Calibration Master" to the sensor in question.
  • the sensor will know how to re-commission or recalibrate itself according to this information for the accurate gas concentration level of its environ that it receives from the Calibration Master.
  • the calibration curve of an AB designed NDIR gas sensor is transformed into a curve that expresses the amount of the target gas present in the sample chamber, P(ppm), as an nth order polynomial of the normalized ratio, x, of the Signal channel detector output over the Reference channel detector output.
  • P(ppm) the amount of the target gas present in the sample chamber
  • x the normalized ratio
  • this calibration curve transformation can be quantitatively expressed in terms of P(ppm), x and G 0 as follows:
  • Vs and V R are respectively the Signal and Reference channel detector outputs when there is target gas in the sample chamber.
  • P (ppm) and G 0 of Equations (4) and (5) above represent respectively the invariant Physics principle portion and the inevitably variant components portion of the methodology.
  • the parameter x is a function of G 0 [see Equation (6)]
  • the value of x can be corrected back to its proper value, and the original calibration curve for the sensor as represented by Equation (4) will still be valid. Under this circumstance, no output drifts should be detected from the sensor and it will stay accurate over time.
  • an NDIR gas sensor e.g. C0 2
  • C0 2 an NDIR gas sensor
  • the sensor no longer accurately detects C0 2 and we wish to restore this sensor to its original accuracy or calibration curve.
  • any gas standards such as 100% Nitrogen or a certified C0 2 concentration (e.g. 1 ,000 ppm) admixed with Nitrogen to achieve this, we must however prepare an acceptable gas standard for this sensor in order that it can be recalibrated.
  • An acceptable gas standard for this purpose could just be the concentration of the gas of interest (e.g. C0 2 ) that surrounds the sensor to be recalibrated.
  • the Calibration Master must be sensing the same air sample in the air space surrounding the to- be-recalibrated sensor. Since the air sample is never stationary but is quite dynamic with or without any air current in the vicinity of the relevant sensor, it is also very important that the to-be-recalibrated sensor and the Calibration Master be sensing the same air sample and also during the same time period. The objective here is to make sure that both the sensor to be recalibrated and the Calibration Master sense or detect the same gas concentration value within the same place and within the same time period.
  • the Calibration Master first sends a command to the relevant sensor to measure the concentration of the gas of interest in the immediate space surrounding it for a certain time period, e.g. 120 seconds. At the same time the Calibration Master also commences to measure the same in the same air space and for the same time period itself via the use of an air sampler. At the end of the specified time period, the Calibration Master requests from the relevant sensor the measured concentration value for the gas of interest. Upon comparing the received value with the one measured by itself and if the gas concentration values between the two are found to be within the expected accuracy specification (e.g. +/- 50 ppm), nothing else will be carried out by the Calibration Master indicating that the relevant sensor is accurate. However, if the compared values lie outside of the expected accuracy specification, the concentration value of the gas of interest as measured by the Calibration Master will be sent to the relevant sensor and it will attempt to recalibrate itself automatically as outlined below.
  • the expected accuracy specification e.g. +/- 50 ppm
  • the ratio of the Signal channel detector output (Vso) over the Reference channel detector output (V R0 ), which is designated as Go VSO VRQ, belongs uniquely only to the variant components portion of the calibration curve and will change as the component characteristics of the sensor inevitably change over time, for example from aging.
  • the re-calibration methodology for AB designed NDIR gas sensors is a procedure that works by updating the G 0 of the sensor to be re-calibrated.
  • FIG. 7 portrays a typical scenario wherein an Absorption Biased (AB) designed NDIR gas sensor 19, e.g. a C0 2 sensor, is to be recalibrated with a Calibration Master 20 held by an operator 21 using the Effortless Re-Calibration (ERC) technique described earlier.
  • Operator 21 is standing just a few feet in front of sensor 19 which is hung roughly in the center and close to the fop of a wall 22 which might typically be 20 ft. wide and 10 ft. tall.
  • ERC Effortless Re-Calibration
  • Operator 21 using the Calibration Master measures the concentration of the gas of interest (e.g. C0 2 ) in the immediate environ of the sensor to be checked and/or recalibrated.
  • the concentration of the gas of interest surrounding the relevant sensor is determined by both it and the Calibration Master wirelessly within the same air space 23 and also within the same time period.
  • this air space 23 is closer to the operator 21 who exhales quite a bit of C0 2 gas into air space 23 while working, the concentration of the gas of interest in the shared air space 23 may be non-uniform with higher gas concentration level leaning towards the operator 21 holding the Calibration Master 20.
  • FIG 9 portrays the details of the components layout for an especially preferred embodiment of a specially designed air sampler 24 encompassing the Calibration Master 20 in the same package.
  • the specially designed air sampler 24 comprises a small air pump 26 whose inlet 27 is connected to one end 28 of an air-tight telescopic sampling tube 29 (see Figures 9 and 10).
  • Outlet 30 of air pump 26 is connected to inlet 31 of an air-tight confined space 32 wherein an AB designed NDIR gas sensor 33 is located.
  • Outlet 34 of confined space 32 leads to free space 35 outside of specially designed air sampler 24.
  • Air pump 26 is powered by a battery pack 36 and controlled by an ON/OFF switch 37 all located inside the air sampler unit 24.
  • Calibration Master 20 Also confined inside air sampler unit 24 is Calibration Master 20 whose printed circuit board (PCB) (not shown in Figure 9) interfaces with AB designed NDIR gas sensor 33 on one side and a LCD display 38 and a keypad 39 on the other. Whereas LCD display 38 shows operator 21 of Calibration Master 20 what is going on at any one time, keypad 39 allows operator 21 to issue functional commands to Calibration Master 20 in order for it to carry out the ERC routine.
  • PCB printed circuit board
  • An air-tight telescopic sampling tube 29 (see Figure 10), when not in use, is lodged by two clamps 40 and 41 located on the right-hand-side of air sampler unit 24.
  • the telescopic tubing 29 (see Figure 10) of air sampler 24 is, in an especially preferred embodiment, specifically designed to have substantially air-tight sections so that air does not get into air sampler unit 24 during sampling except through inlet 42 of telescopic sampling tube 29 (see Figures 9 and 10).
  • the air-tight telescopic sampling tube 29 might be 6 ft. long when fully extended with 9 sections and an outside diameter of 0.5". When all its sections are drawn back, its length is around 8". In theory this air-tight sampling tube 29 can be of any length and any diameter as long as it is convenient to use for air sampling under all circumstances.
  • the ERC procedure has been described in terms of how it can be accomplished in the field. It should be noted that the ERC procedure can be accomplished very quickly, without the need for using standard gasses, which greatly reduces the cost of the procedure. In practice, it is important to realize that the ERC procedure allows a technician to check calibration of large numbers of sensors in short periods of time, a limiting factor being the time necessary to move between sensors and a short amount of time needed for an ERC procedure.
  • each gas sensor has a unique identification number.
  • a Calibration Master can address a particular gas sensor via its unique ID number and can request instantaneous data from it in order to ascertain whether the gas sensor is accurate.
  • Calibration Master 20 software is included in Calibration Master 20 (e.g., in processor memory or other memory media) to facilitate the ERC process and also allow Calibration Master 20 to interact with a computer (e.g., by use of the Internet, a LAN, a WAN or hardware device) where information from Calibration Master 20 can be collected and utilized with one or more computer program modules to track compliance with scheduled calibration checks.
  • Calibration Master 20 can create and store a data file containing desired information such as the unique identifier of the gas sensor being checked, the gas concentration detected by the gas sensor, the date and time of the procedure, whether the gas sensor was recalibrated and any other desired information.
  • automatic reports documenting the ERC procedure, and its results can be generated, stored or sent to one or more additional locations electronically, such as through, for example, an Internet connection. Because the information used to generate such results is stored electronically, human error is minimized and, if desired, the system can be configured with sufficient safeguards so as to prevent doctoring of calibration results, thus guaranteeing better information regarding long term stability results of gas sensors subjected to the ERC procedure.
  • a Calibration Master can be configured so that it can be used to test multiple gas sensors used to sense different types of gasses or a single gas sensor that can detect multiple gasses.
  • a single gas sensor might be configured so that it can detect both C0 2 and water vapor, and a single Calibration Master can be designed to calibrate the sensor for both gasses.
  • the present invention has now advanced a novel Re- calibration methodology applicable only to AB designed NDIR gas sensors and apparatus that can be used to perform such methodology.
  • the final portion of the present invention will now address how a specially designed AB NDIR gas sensor can be made to recalibrate itself without the need for using a Calibration Master as described earlier to carry out a re-calibration procedure.
  • the first step is to install a "Standard" Signal channel detector 43 and a “Standard” Reference detector 44 both equipped with the same and identical band-pass filter 45 neutral to the detection of the target gas respectively next to the Signal channel detector 5 and the Reference channel detector 6 as shown in Figure 1 1.
  • both Signal channel detector 5 and Reference channel detector 6 are equipped with the same narrow band-pass filter 8 which is used to detect the gas of interest in the sample chamber 9 (see Figures 1 and 1 1 ).
  • Detectors 5, 6, 43 and 44 are all of the same kind but each has its own spectral filter.
  • Detectors 5 and 6 have the same spectral filter for the detection of the target gas whereas detectors 43 and 44 have the same filter that is neutral to the detection of the target gas, i.e. passing no radiation that would be absorbed by it.
  • detectors 5 and 6 in the component layout configuration for an AB designed NDIR gas sensor as shown in Figure 1 are single channel detectors. When detectors 5 and 43 and also detectors 6 and 44 are installed next to each other together as pairs, they can be, respectively, two dual-channel detectors 46 and 47 (see Figure 11 ).
  • the values for the CWL and FWHM for filter 8 depend upon which target gas the sensor is designed to detect.
  • the GWL for neutral band-pass filters 45 can be at 2.20 ⁇ , 3.91 ⁇ or 5.00 ⁇ with a FWHM of ⁇ 0.1 ⁇ . None of the common gases encountered by the general public everyday including those in the atmosphere have absorption bands at these wavelengths within the specified spectral pass-band of ⁇ 0.1 ⁇ .
  • Standard GAMMA is the ratio of the output of the "Standard” Signal channel detector 43 over the output of the "Standard” Reference channel detector 44 (see Figure 11 ) is now defined and created.
  • the value of "Standard GAMMA” is independent of the presence of the target gas in the sample chamber since the spectral filters that the "Standard” detectors carry are neutral to the detection of the target gas. In other words, the radiation passed by these filters will not be absorbed by the target gas in the sample chamber of the sensor.
  • the "Standard GAMMA” is therefore unrelated to the measurement Physics of the AB designed NDIR gas sensor but serves to monitor the performance characteristics of all the sensor components over time.
  • the value of "Standard GAMMA" will change accordingly.
  • the value of the regular G Q of the AB designed NDIR gas sensor will also change when the performance characteristics of the sensor components change over time and hence affect the calibration curve of the sensor.
  • the only way to compensate for the change of the G 0 value in order to restore the measurement accuracy of the sensor is to update it from time to time. This can be done by flowing 100% dry N 2 through the sample chamber of the sensor and re-determine the correct Go value or to execute the re-calibration methodology disclosed earlier above.
  • the present invention advances a third way to update the value of G 0 when there are changes in the performance characteristics of the sensor components over time by taking advantage of the definition and creation of the concept for "Standard GAMMA".
  • the "Standard GAMMA” can be used to update the regular Go when the performance characteristics of the sensor components change over time. It can update proportionally the value of the regular G 0 with the change it detects in itself in order to preserve the measurement accuracy of the sensor going forward in time. In other words, such a sensor has now become self-commissioning, namely knowing how to correct any performance characteristics changes in the sensor components over time thereby restoring the measurement accuracy of the sensor since its initial calibration.
  • a sensor according to the present invention is ideally suited for use with the HVAC&R industry, especially when numerous such sensors are networked together in a single structure, such as a building.
  • the accuracy gained by continued self-commissioning allows networked sensors to now fulfill a long-felt need for stable sensors.
  • multiple sensors can be combined within a single sensor unit, by adding one or more additional pairs of detectors., one of which is in the signal channel, the other of which Is in the reference channel, such additional pairs of gas detectors meeting the requirements of an AB designed NDIR gas sensor— namely, that this new pair of detectors is equipped with the same or identical narrow band-pass filter used to spectrally define and detect a different target gas of interest.
  • Figure 1 1 illustrates two pairs of detectors, as compared to Figure 1 , such a sensor would now have three detectors in each of the signal and reference channels, two of which function to detect two different target gasses, and one of which serves as the Standard in accordance with the teachings of this invention.
  • a single pair of Standard detectors can be used to calibrate multiple pairs of different target gas detectors.
  • a single sensor can be used to detect two or more gasses, such as C0 2 and water vapor, and the information obtained from the Standard can be used to self-commission the multiple gas detectors contained in the same single sensor.
  • the present invention discloses a powerful new NDIR gas sensor that is self-commissioning, that can detect one or more target gasses, which can be networked for inclusion in sophisticated networking applications that have gone unused to date for want of suitable sensors.
  • the self-commissioning sensors disclosed herein ensure that such sensors will represent a major advance in the field of NDIR gas sensors.
  • sensors according to the present invention may ever so slowly drift over time, albeit in an amount of time much longer than presently encountered within the industry.
  • the reason for this is the lack of a perfect source.
  • the present invention ensures that changes in the intensity or spectral content of the source will be corrected by self- commissioning. Yet, if there is physical change in the source that affects its radiation pattern, which might theoretically occur if, for example, there is sagging of a filament in an incandescent light bulb or possible bubbling on a MEMS source, there is a possibility of a very slight drift over a long period of time that cannot be corrected by self-commissioning. Fortunately, however, this theoretical problem can be overcome by also using the re-calibration methodology disclosed earlier in this application.
  • a drift-free sensor is truly obtained which, if it ever does drift, can easily be recalibrated. And, even if the sensor never does drift, its users will know it can quickly be checked and recalibrated if need be. This then represents about as perfect an NDIR sensor as there ever has been, one that can only be improved with respect to drift by use of a perfect source.

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Abstract

Selon l'invention, les capteurs NDIR sollicités par absorption peuvent être réétalonnés par ajustement d'une courbe d'étalonnage obtenue à partir d'un rapport gamma (« G ») qui a été normalisée par le rapport gamma lorsqu'aucun gaz d'échantillon n'est présent dans la chambre d'échantillon (« Go »), G étant le rapport d'une sortie de canal de signal (« Vs ») du capteur de gaz NDIR divisé par une sortie de canal de référence (« VR ») du capteur de gaz NDIR. Un capteur de gaz NDIR sollicité par absorption utilise un filtre passe-bande à spectre étroit identique pour une sélection de longueur d'onde pour à la fois un canal de signal ayant une longueur de chemin de canal de signal et un canal de référence ayant une longueur de chemin de canal de référence et une sollicitation d'absorption est appliquée au canal de signal par le fait de rendre la longueur de chemin de signal de canal plus longue que la longueur de chemin de canal de référence. Le réétalonnage peut être atteint par ajustement de Go sur la base d'un algorithme de courbe d'étalonnage inversée qui utilise une concentration de gaz échantillon déterminée par un capteur de gaz NDIR maître. En variante, le capteur de gaz NDIR peut être auto-réétalonné à l'aide d'un rapport gamma standard stocké et d'un rapport gamma standard mesuré et d'un algorithme d'auto-étalonnage pour corriger la courbe d'étalonnage.
EP12794011.2A 2011-05-31 2012-05-25 Réétalonnage de capteurs de gaz non dispersif à absorption dans l'infrarouge (ndir) sollicités par absorption Withdrawn EP2715291A4 (fr)

Applications Claiming Priority (4)

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US13/149,738 US8178832B1 (en) 2011-05-31 2011-05-31 Re-calibration methodology for NDIR gas sensors
US13/348,568 US8222606B1 (en) 2011-05-31 2012-01-11 Air sampler for recalibration of absorption biased designed NDIR gas sensors
US13/420,323 US8217355B1 (en) 2011-05-31 2012-03-14 Self-commissioning NDIR gas sensors
PCT/US2012/039539 WO2012166585A2 (fr) 2011-05-31 2012-05-25 Réétalonnage de capteurs de gaz non dispersif à absorption dans l'infrarouge (ndir) sollicités par absorption

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CA2837588A1 (fr) 2012-12-06
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WO2012166585A2 (fr) 2012-12-06

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