Single-pixel multispectral imager for torch and burner combustion efficiency measurement

Abstract

Presented embodiments provide a method of determining combustion efficiency measurements using an imager. In an embodiment, a single-pixel multispectral imager is used to provide precise measurement of combustion efficiency for torch and burner assemblies used in the industry.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Provisional Patent Application 63 / 517,349, filed on August 3, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] Aspects of the present disclosure relate to imaging techniques. More specifically, aspects of the present disclosure relate to multi-spectral imagers for flare and burner combustion efficiency measurements. Background Art

[0004] Industry is constantly trying to become more efficient in its operations to maximize profits and minimize risks. Energy usage has been a focus of industry for decades. By using energy efficiently, the cost of manufacturing products can be greatly reduced. Over time, energy costs have generally risen, leading to the need for innovation.

[0005] Historically, the combustion of hydrocarbon fuels has been accomplished by several methods. In addition to the combustion of hydrocarbon fuels, waste products such as exhaust gas streams may contain hydrocarbons. The emission of raw hydrocarbon fuels into the atmosphere is strictly regulated; therefore, measures are taken to prevent the emission of such hydrocarbons.

[0006] One method used to treat hydrocarbon gaseous waste streams is to use a flare system to burn the hydrocarbons, rather than venting them. Such systems can be problematic. The flare may need to be constantly "tuned," with the amount of hydrocarbons fed to the flare being tightly controlled. Without regulation of these gas streams, incomplete combustion can occur, resulting in inefficient conversion of the hydrocarbons to carbon dioxide. The flare system must be closely monitored to ensure that the feed stream is not too rich or too lean to provide an efficient combustion process.

[0007] Several methods can be used to quantify the combustion efficiency of a flare. In some cases, a qualified spotter is used to observe the emissions and visually determine whether the gaseous emissions are being properly burned. In other more automated systems, a series of cameras can be set up to provide a visual view of the combustion. Further embodiments monitor the oxygen and fuel provided to the burner system to calculate the most efficient combustion possible. In such a system, automatic control is provided to the operating control room to adjust parameters as needed.

[0008] Over time, there is an increasing need to become more efficient and provide tighter control over the flare or burner capabilities. Traditional aspects of combustion technology do not provide an adequate measure of combustion efficiency.

[0009] It would be desirable to provide an apparatus and method that is easy to operate and that provides better results than conventional apparatus and methods.

[0010] There is also a need to provide an apparatus and method which do not suffer from the above-mentioned disadvantages, namely incomplete combustion and emission of hydrocarbons to the environment.

[0011] There is also a need to reduce the economic costs associated with the above-mentioned operations and equipment using conventional tools. Summary of the invention

[0012] Therefore, to understand in detail the manner of the above-mentioned features of the present disclosure, a more specific description of the present disclosure briefly summarized below can be obtained with reference to the embodiments, some of which are illustrated in the accompanying drawings. It should be noted that the accompanying drawings only show typical embodiments of the present disclosure and should not be considered as limiting the scope thereof, as the present disclosure may allow for other equally effective embodiments without specific description. Therefore, the following overview only provides a few aspects of the description and should not be used to limit the described embodiments to a single concept.

[0013] In one exemplary embodiment, a device for analyzing a combustion source is disclosed. The device may include:

[0014] A collimating component is used to accept light from a light source and generate a collimated light beam.

[0015] a splitting component configured to receive the collimated light beam and generate at least a first light beam and a second light beam, wherein the wavelength of the first light beam is included in the first spectral band of interest and the wavelength of the second light beam is included in the second spectral band of interest,

[0016] wherein the first light beam is directed to a first detector configured to process the first light beam, and

[0017] The second light beam is directed to a second detector configured to process the second light beam.

[0018] In another exemplary embodiment, the device may include a first lens configured to receive light from a light source and produce a first light beam. The device may also include a second lens configured to receive the first light beam and produce a second collimated light beam. The device may also include a scanning system configured to receive the second collimated light beam and produce a redirected third light beam. The device may also include a broadband filter configured to receive the redirected third light beam and produce a second filtered light beam. The device may also include a first beam splitter configured to receive the filtered second light beam and separate the filtered second light beam into a first separated portion and a second separated portion. The device may also include a second beam splitter configured to receive the second separated portion and produce a third separated portion and a fourth separated portion. The device may also include a mirror configured to direct the fourth separated portion. The device may also include at least a first narrowband filter configured to receive the first separated portion and produce a first filtered separated portion. The device may also include a first partial lens configured to receive the first filtered separated portion and produce a final first filtered separated portion. The device may also include a first detector configured to process the final first filtered separation portion. The device may also include a second narrowband filter configured to accept the third separation portion and produce the third filtered separation portion. The device may also include a second partial lens configured to accept the third filtered separation portion and produce the final third filtered separation portion. The device may also include a second detector configured to process the final third filtered separation portion. The device may also include a third narrowband filter configured to process the fourth separation portion and produce the fourth filtered separation portion. The device may also include a fourth partial lens configured to process the fourth filtered separation portion and produce the final fourth filtered separation portion. The device may also include a third detector configured to process the final fourth filtered separation portion.

[0019] In another exemplary embodiment, a device for analyzing a combustion source is disclosed. The device may include a first lens configured to receive collimated light. The device may also include a second lens configured to receive a first light beam and generate a second light beam. The device may also include a scanner configured to receive the second collimated light beam and generate a third redirected light beam. The device may also include a broadband filter configured to receive the third light beam and generate a fourth filtered light beam. The device may also include a diffraction grating configured to receive and process the fourth filtered light beam and generate a diffracted light beam. The device may also include a detector array configured to receive and process the diffracted collimated light beam.

[0020] In another exemplary embodiment, a method for determining a flare combustion efficiency is disclosed. The method may include:

[0021] Receives light from a light source and produces a collimated beam,

[0022] processing the collimated light beam to produce at least a first light beam and a second light beam, the first light beam having a wavelength included in a first spectral band of interest and the second light beam having a wavelength included in a second spectral band of interest,

[0023] The first light beam and the second light beam are processed using a first detector (340) and a second detector to identify different spectral bands to calculate the combustion efficiency.

[0024] In another embodiment, the method may include receiving a beam from the torch with a telescope and producing a collimated beam. The method may also include processing the collimated beam with a scanner to produce a redirected collimated beam. The method may also include receiving the redirected collimated beam at a broadband filter and producing a second filtered beam. The method may also include processing the second filtered beam with a diffraction grating to produce a diffracted collimated beam. The method may also include processing the diffracted collimated beam with a detector array to identify different light bands to calculate combustion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Therefore, to understand in detail the manner of the above-mentioned features of the present disclosure, a more specific description of the present disclosure, briefly summarized below, can be obtained by reference to the embodiments, some of which are illustrated in the accompanying drawings. It is noted, however, that the accompanying drawings illustrate only typical embodiments of the present disclosure and are therefore not to be considered limiting of its scope, as the present disclosure may admit to other equally effective embodiments.

[0026] Figure 1 is a side elevation view of a flare system used in industry and a graph of the combustion efficiency of the flare system.

[0027] Figure 2 is a graph of the spectral band of interest in the mid-infrared region of the combustion process being analyzed.

[0028] Figure 3 is an example embodiment of an aspect of the present disclosure, wherein a transceiver uses a plurality of detectors.

[0029] Figure 4 is an example embodiment of an aspect of the present disclosure, wherein the transceiver uses a diffraction grating and a detector array.

[0030] Figure 5 is a side view of a prior art photovoltaic detector.

[0031] Figure 6 is a schematic diagram showing the principle of a dichroic filter.

[0032] Figure 7 is a schematic diagram of a dichroic filter scheme in an exemplary embodiment of the present disclosure.

[0033] Figure 8 Isolation of the hydrocarbon band using a dichroic filter is shown.

[0034] Fig. 9 is a diagram of a dichroic filter used to isolate the carbon dioxide band, which is approximately 4.26 microns from a reference band (approximately 3.9 microns).

[0035] Fig.10 is a view of a dual wedge prism scanner.

[0036] Fig.11 is an illustration of a fast steering mirror scanner.

[0037] Fig.12 A method of performing analysis of combustion efficiency measurements in an exemplary embodiment of the present disclosure is provided.

[0038] To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements in the figures. It is contemplated that elements disclosed in one embodiment may be beneficially utilized on other embodiments without specific recitation. DETAILED DESCRIPTION

[0039] In the following, reference is made to embodiments of the present disclosure. However, it should be understood that the present disclosure is not limited to the specifically described embodiments. On the contrary, any combination of the following features and elements, whether or not related to different embodiments, is considered to be able to implement and practice the present disclosure. In addition, although the embodiments of the present disclosure can achieve advantages over other possible solutions and / or prior art, whether a specific advantage is achieved by a given embodiment does not limit the present disclosure. Therefore, the following aspects, features, embodiments and advantages are merely illustrative and are not considered to be elements or limitations of the claims unless expressly stated in the claims. Similarly, reference to the "present disclosure" should not be interpreted as a summary of the inventive subject matter disclosed herein, and should not be considered to be elements or limitations of the claims unless expressly stated in the claims.

[0040] Although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts here, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish an element, component, region, layer or part from another region, layer or part. Terms such as "first", "second" and other numerical terms, when used here, do not mean order or sequence, unless the context clearly indicates. Therefore, without departing from the teaching of the exemplary embodiment, the first element, component, region, layer or part discussed here can be referred to as the second element, component, region, layer or part.

[0041] When an element or layer is referred to as being "on another element or layer," "engaged to," "connected to," or "coupled to" another element or layer, it may be directly on, engaged to, connected to, coupled to, or there may be intermediate elements or layers. Conversely, when an element is referred to as being "directly on another element or layer," "directly engaged to," "directly connected to," or "directly coupled to" another element or layer, there may be no intermediate elements or layers. Other words used to describe relationships between elements should be interpreted in a similar manner. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed terms.

[0042] Some embodiments will now be described with reference to the accompanying drawings. To remain consistent, similar elements in each figure will reference similar numbers. In the following description, many details are set forth to provide an understanding of various embodiments and / or features. However, it will be appreciated by those skilled in the art that some embodiments can be implemented without these details, and many variations or modifications to the described embodiments are possible. As used herein, the terms "above" and "below", "up" and "below", "upper" and "lower", "upwards" and "downwards", and other similar terms representing relative positions above or below a given point are used in this specification to more clearly describe certain embodiments.

[0043] refer to Figure 1 , aspects of the present disclosure provide an apparatus for measuring the combustion efficiency, hereinafter referred to as "CE" of a gas flare or oil burner. Figure 1 , a side elevation view of the flare is provided. As shown, aspects of the present disclosure may be the combustion of gas or oil in the open atmosphere. Such non-limiting embodiments may include well testing operations, refineries, production facilities, and other petrochemical plants. Combustion efficiency is a quantity that characterizes the performance of a combustion where the goal is to convert hydrocarbons into carbon dioxide, as it has a lower greenhouse effect than other gaseous hydrocarbons such as methane. This quantity is defined as follows:

[0044]

[0045] But there are several other ways to define it, depending on the type of gas under consideration. The values ​​in brackets refer to the concentration in parts per million (ppm), UHC stands for unburned hydrocarbons, and n. is the average number of carbon molecules in the unburned hydrocarbons. Figure 1 Provided at the bottom, a graph showing the combustion efficiency calculation is given.

[0046] Aspects of the present disclosure provide an apparatus that uses an imaging system in the mid-infrared region (between 3 and 5 um) that collects light from a flame to calculate combustion efficiency (CE). Hot combustion gases in a flame within a torch or burner emit specific bands of infrared light; therefore, relative gas concentrations in the flame can be inferred from the spectral content of this light. Aspects of the present disclosure operate by first collecting light from different locations in and around the flame using a scanner (steering mirror, galvanometer scanner - a scanner in which one or both mirrors are tilted to deflect the light beam, or a dual wedge prism scanner).

[0047] In the described aspect, the collected light is separated into several light streams according to wavelength. The light is then filtered to target specific spectral bands of interest, such as hydrocarbon bands between 3200nm and 3400nm, carbon dioxide bands near 4260nm, and reference bands between 3500nm and 4000nm. Other spectral bands of interest can be added, such as carbon monoxide bands near 4500 and 4800nm. Each light stream is sent to a different detector to generate a signal proportional to the intensity in a specific spectral band. These signals are then used to calculate the ratio of gas species.

[0048] The idea behind this measurement is to scan the area where the flame is present and extract samples from the border of the flame where the gases are still hot so they glow, but combustion is complete. Focusing the analysis on the border of the flame ensures that CE can be calculated reliably. In an embodiment, the scan can be used to generate a cross section of the flame to make the detection of the flame border as simple as possible.

[0049] In the aspects described here, a single-pixel photon multispectral imager is used because it does not produce a multispectral image like conventional devices, but rather produces a single pixel at each sampling time. Since the scanner is aimed at different targets, it is possible to reconstruct a complete image of the scene in different spectral bands of interest. In addition to the above, there are other possibilities.

[0050] The idea behind the measurement is to collect light in and around the flame using a telescope coupled to a scanner. When the scanner is aimed at the flame, the light emitted by the hot combustion gases is received and analyzed in different spectral bands. CE can be calculated at the flame boundary where combustion is complete, but the combustion gases are still hot enough to glow. By scanning the flame, a spectrum similar to Figure 1 The signal intensity of the signal intensity shown in . The samples on the boundary layer can be used to calculate CE.

[0051] refer to Figure 2 , showing the absorption coefficients of different gases of interest in the range of 2.5 to 5um. For this measurement, we are mainly interested in the hydrocarbon band of 3200-3400nm, the carbon dioxide band of 4190-4330nm, the reference band between the hydrocarbon and carbon dioxide bands, and, if necessary, the carbon monoxide band of 4700-4800nm. The idea of ​​this measurement is to extract the intensity of each band of interest and calculate the corresponding integrated concentration knowing the average absorption coefficient of each gas and the filter shape. Then it is possible to calculate CE. The reference band is used to correct other intensities to remove broadband background radiation, such as radiation from soot particles. As will be understood, other wavelengths besides the above wavelengths can be used.

[0052] refer to Figure 3 , an embodiment of the device 300 is disclosed. Incident light 306 is received by a telescope 305, which transmits the light to a scanner 307. As will be appreciated, a variety of optical instruments may be used in conjunction with the device 300. As disclosed, a telescope 305 may be used. Different types of lenses within the telescope 305 may be used to help transmit the light. A first broadband filter 312 removes unwanted wavelengths received. In an example embodiment, a 3 to 5 um bandpass filter may be used. A specific window may be used to reject the same wavelength. The light is then separated by two beam splitters 302, 304. These beam splitters may be standard beam splitters, meaning they are wavelength independent, or specific dichroic filters that will separate the light based on wavelength. The latter avoids wasting light and improves the signal-to-noise ratio. Each light stream then passes through a specific "narrow" bandpass filter (100-200 nanometers wide) that targets a specific species. The light in each light stream is then focused onto a detector. By using beam splitters 302 , 304 and mirror 326 , and associated narrowband filters 320 , 322 , 324 , and accompanying lenses 330 , 332 , 334 , the wavelength affects detectors 340 , 342 , and 344 .

[0053] The second embodiment is shown in Figure 4. In this embodiment 400, a linear detector array 402 is used instead of a single detector coupled to a diffraction grating 404. Light is diffracted by the grating based on its wavelength, which allows the wavelengths to be separated. The signal on each detector of the array allows a complete spectral map to be calculated, from which similar calculations can be made for each gas. The light passes through a telescope 406 and is reflected by a scanner 408. The light then passes through a broadband filter 414 before bouncing from the diffraction grating 404 to the detector array 402. In both of the disclosed embodiments, a housing can be created to house components other than the first lens. Other configurations are also possible and should not be considered limiting. As will be understood, various optical instruments can be used in place of the disclosed telescope 406, as previously disclosed. In other embodiments, multiple lenses can be used in the telescope.

[0054] Figure 5 A conventional photovoltaic detector 500 is shown that can be used for this application because they have relatively high sensitivity, high linearity, and very high speed. In an embodiment, a unit can be used because it includes filters for hydrocarbons, carbon monoxide, and a reference band. In addition, different types of detectors can be used, such as a non-cooled detector, which means that it does not require a thermoelectric cooler. In different embodiments, cooled and non-cooled detectors can be used.

[0055] refer to Figure 6 , discloses an arrangement using dichroic filters. As discussed previously, dichroic filters separate light between transmission and reflection based on wavelength. With these filters, all of the light from the hydrocarbon and carbon dioxide bands can be extracted and sent to the detector with minimal loss. Sample detectors such as Figure 7 The first filter reflects light from the hydrocarbon band and transmits light from the carbon dioxide and reference bands. The second filter reflects light from the reference band and transmits light from the carbon dioxide band. Figure 8 and Fig. 9 Different types of optical coatings that can be used for these two filters are shown. Figure 8 In , the reflection percentage 800 starts at a minimum at about 3500 nm and then increases to 3800 nm. The transmittance 802 has a similar but opposite curve. Fig. 9 , the percent reflection 900 starts at a maximum at about 4000 nm, then decreases to 4150 nm, then increases again at 4600, returning to a high value at 4800. The transmittance 902 has a similar but opposite graph.

[0056] The scanner can be arranged in two different ways. The first arrangement is based on a double wedge prism 1000, such as Fig.10 A second solution is to use a fast steering mirror scanner 1100, such as Fig.11 In further embodiments, galvanometer scanning or MEMS scanning may be used.

[0057] refer to Fig.12 , a method 1200 for determining the combustion efficiency of a combustion source is shown. As will be appreciated, the combustion source may be a torch or burner such as used in industry. The method 1200 may include, at 1202, receiving a light beam from the torch with a telescope and producing a collimated light beam. The method may also include, at 1204, processing the collimated light beam with a scanner to produce redirected collimated light. As will be appreciated, the scanner may use a double wedge prism, or may be a fast steering mirror scanner. At 1206, the method may continue by receiving the redirected collimated light at a first lens and processing the redirected collimated light into a second light beam. At 1208, the method may continue by receiving the second light beam at a broadband filter and producing a second filtered light beam. At 1210, the method may continue by processing the second filtered light beam with a diffraction grating to produce a diffracted collimated light beam. At 1212, the method may continue by processing the diffracted collimated light beam with a detector array to identify different light bands to calculate the combustion efficiency. As will be appreciated, calculations of combustion efficiency can be performed using a computer that will analyze the light pattern emitted from the burner or light source and then perform a simulation of the torch based on the light received and compare the simulation results to the actual light pattern. A data sheet for this type of analysis can be referenced so that a single set of combustion efficiency calculations can be referenced to derive the results.

[0058] Example embodiments of the claims are described herein. The examples discussed should not be considered limiting of the subject matter. In one exemplary embodiment, a device for analyzing a combustion source is disclosed. The device may include a first lens configured to accept light from a light source and produce a first light beam. The device may also include a second lens configured to accept the first light beam and produce a second collimated light beam. The device may also include a scanning system configured to accept the second collimated light beam and produce a redirected third light beam. The device may also include a broadband filter configured to accept the redirected third light beam and produce a second filtered light beam. The device may also include a first beam splitter configured to accept the filtered second light beam and split the filtered second light beam into a first separated portion and a second separated portion. The device may also include a second beam splitter configured to accept the second separated portion and produce a third separated portion and a fourth separated portion. The device may also include a mirror configured to direct the fourth separated portion. The device may also include at least a first narrowband filter configured to accept the first separated portion and produce a first filtered separated portion. The device may also include a first partial lens configured to receive the first filtered separation portion and produce a final first filtered separation portion. The device may also include a first detector configured to process the final first filtered separation portion. The device may also include a second narrowband filter configured to receive the third separation portion and produce a third filtered separation portion. The device may also include a second partial lens configured to receive the third filtered separation portion and produce a final third filtered separation portion. The device may also include a second detector configured to process the final third filtered separation portion. The device may also include a third narrowband filter configured to process the fourth separation portion and produce a fourth filtered separation portion. The device may also include a fourth partial lens configured to process the fourth filtered separation portion and produce a final fourth filtered separation portion. The device may also include a third detector configured to process the final fourth filtered separation portion.

[0059] In another exemplary embodiment, the device may further include a housing configured to receive all components except the first lens.

[0060] In another exemplary embodiment, the apparatus may be configured wherein the beam splitter is a dichroic mirror.

[0061] In another exemplary embodiment, the apparatus may be configured wherein the apparatus is a transceiver.

[0062] In another exemplary embodiment, a device for analyzing a combustion source is disclosed. The device may include a first lens configured to receive collimated light. The device may also include a second lens configured to receive a first light beam and produce a second light beam. The device may also include a scanner configured to receive the second collimated light beam and produce a third redirected light beam. The device may also include a broadband filter configured to receive the third light beam and produce a fourth filtered light beam. The device may also include a diffraction grating configured to receive and process the fourth filtered light beam and produce a diffracted light beam. The device may also include a detector array configured to receive and process the diffracted collimated light beam.

[0063] In another example, the device may further include a housing configured to receive all components except the first lens.

[0064] In another example, the apparatus may be configured wherein the apparatus is a transceiver.

[0065] In another exemplary embodiment, a method of determining the combustion efficiency of a torch is disclosed. The method may include receiving a light beam from the torch with a telescope and producing a collimated light beam. The method may also include processing the collimated light beam with a scanner to produce a redirected collimated light beam. The method may also include receiving the redirected collimated light beam at a broadband filter and producing a second filtered light beam. The method may also include processing the second filtered light beam with a diffraction grating to produce a diffracted collimated light beam. The method may also include processing the diffracted collimated light beam with a detector array to identify different light bands to calculate the combustion efficiency.

[0066] In another example embodiment, the method may be performed wherein the different light band is at least one of a hydrocarbon band and a carbon dioxide band.

[0067] In another example embodiment, the method may be performed wherein the scanner uses a double wedge prism.

[0068] In another example embodiment, the method may be performed wherein the scanner uses a fast steering mirror.

[0069] In another exemplary embodiment, the method may be performed wherein the broadband filter is a dichroic filter.

[0070] In another example embodiment, the method may be performed wherein the scanner is a MEMS scanner.

[0071] In another example embodiment, the method may be performed wherein the scanner is a galvanometer scanner.

[0072] The foregoing description of the embodiments is provided for the purpose of illustration and description. It is not intended to be exhaustive or limit the present disclosure. The individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but where applicable, they are interchangeable and can be used in selected embodiments even if not specifically shown or described. It can be changed in many ways. Such changes should not be considered as departing from the present disclosure, and all such modifications are intended to be included within the scope of the present disclosure.

[0073] Although embodiments have been described herein, those skilled in the art having benefit of this disclosure will appreciate that other embodiments may be conceived without departing from the scope of this disclosure. Therefore, the scope of this claim or any subsequent claims should not be unduly limited by the description of the embodiments described herein.

Claims

1. A device for analyzing a combustion source, comprising: a collimating assembly for receiving light from a light source (306) and generating a collimated light beam, a separation assembly configured to receive the collimated light beam and generate at least a first light beam and a second light beam, wherein the wavelength of the first light beam is included in the first spectral band of interest and the wavelength of the second light beam is included in the second spectral band of interest, wherein the first light beam is directed to a first detector (340) configured to process the first light beam, and The second light beam is directed to a second detector (342) configured to process the second light beam.

2. The device according to claim 1, wherein the separation component comprises: at least a first beam splitter configured to receive the collimated beam and split the collimated beam into a first separate beam and a second separate beam, and at least a first narrowband filter and a second narrowband filter, each configured to receive the split beam and produce a filtered split beam, wherein the first narrowband filter is configured to receive and filter the first split beam to target a first spectral band of interest, and The first beam is a filtered separated beam produced by a first narrower filter, and the second beam is a filtered separated beam produced by a second narrower filter.

3. The device according to claim 2, wherein the separation component further comprises: a second beam splitter configured to receive the second split beam and split the second split beam into a third split beam and a fourth split beam, and a third narrowband filter configured to receive the split beam and produce a filtered split beam, wherein the second narrowband filter is configured to receive and filter the third split beam to target a second spectral band of interest, wherein the third narrowband filter is configured to receive and filter the fourth split beam to target a third spectral band of interest, The third filtered light beam generated by the third narrowband filter forms a third light beam generated by the separation component, the wavelength of the third light beam is included in the third spectral band of interest, and is directed to a third detector configured to process the third light beam.

4. The apparatus of claim 2, wherein at least one beam splitter is a dichroic mirror. The device according to claim 2 , wherein a passband width of each narrowband filter is less than or equal to 200 nm.

6. The device according to claim 1, wherein the separation component comprises a diffraction grating configured to receive and process the collimated light beam and generate a diffracted collimated light beam comprising a first light beam and a second light beam; and The first detector and the second detector are part of a detector array.

7. The apparatus of claim 1, wherein at least one band of interest is a hydrocarbon band, a carbon dioxide band at 4190-4330 nm, or a carbon monoxide band.

8. The apparatus of claim 1 , wherein the collimating assembly comprises a telescope including a first telescope lens and a second telescope lens, the first telescope lens being configured to receive light from the light source and generate a telescope beam directed toward the second telescope lens, the second telescope lens generating a collimated beam.

9. The apparatus of claim 1, comprising a scanning system configured to receive and redirect the collimated light beam.

10. The apparatus of claim 9, wherein the scanning system uses a double wedge prism or a fast steering mirror.

11. The apparatus of claim 9, wherein the scanning system is a MEMS scanner or a galvanometer scanner.

12. The apparatus of claim 1, comprising a broadband filter configured to receive and filter the collimated light beam.

13. The apparatus of claim 12, wherein the broadband filter is a dichroic filter.

14. A method for determining the combustion efficiency of a flare, comprising: Receives light from a light source and produces a collimated beam. processing the collimated light beam to produce at least a first light beam and a second light beam, the first light beam having a wavelength included in a first spectral band of interest and the second light beam having a wavelength included in a second spectral band of interest, The first light beam and the second light beam are processed with the first detector and the second detector to identify different spectral bands to calculate the combustion efficiency.

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