Laser-Based Mass Flow Rate Sensor Onboard HFiRE Flight 1

Chen, Shin-Juh; Paige, M. E.; Silver, Joel A.; Williams, Skip; Barhorst, Todd

doi:10.2514/6.2009-5065

Cited by 12 publications

(8 citation statements)

References 10 publications

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“…Recent work has demonstrated the utility of the wavelength modulation spectroscopy in oxygen for measurements in wind tunnels (Lyle et al, 2007 a and b), and this approach has the distinction of successful development for flight testing as part of the HIFiRE 1 experimental package (Chen et al, 2009;Brown and Barhorst, 2011). The wavelength modulation approach is seeing wide applications for combustion systems where the measurement of water vapor and carbon monoxide are also of interest.…”

Section: Advances In Integrated Path Measurementsmentioning

confidence: 97%

Optical Diagnostics for High-Speed Flows

Miles

2013

43rd Fluid Dynamics Conference

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Since the year 2000 there has been a revolution in diagnostics of high-speed air flows. The foundations for this revolution were laid over the previous few decades, but with the development of new short pulse and pulse burst laser technologies, higher laser powers and higher pulse energies, new high speed cameras, better laser control and improved detection and laser delivery methodologies, many very effective new capabilities have been developed. Newly developed methods for molecular tagging velocimetry provide high fidelity visualization of transport properties and may be extended to simultaneous temperature measurements. Rapid field imaging with frequency tunable pulse burst lasers show instantaneous flow structure and complex boundary and mixing interactions. Extending these pulse burst concepts to swept volumetric imaging is very promising for full volumetric data collection. Fast wavelength modulation spectroscopy follows real time flow variation, and three dimensional particle imaging extends particle imaging velocimetry to volumetric data acquisition.

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Section: Advances In Integrated Path Measurementsmentioning

confidence: 97%

Optical Diagnostics for High-Speed Flows

Miles

2013

43rd Fluid Dynamics Conference

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“…Since then, wavelengthmodulation spectroscopy (WMS) has been used extensively to study a wide range of harsh combustion environments [3,129,39,27] particularly due to several experimental and theoretical advancements enabling robust, calibration-free WMS techniques [130,40,41,131,132,133]. Typically, the first-and second-harmonic signals are used to calculate gas properties and will be the focus here.…”

Section: Wavelength-modulation Spectroscopymentioning

confidence: 99%

“…Historically, most IR-LAS sensing in scramjets has employed near-IR telecommunication-grade TDLs for measuring temperature, H 2 O, and velocity in continuous-flow facilities [291,178,43,293,124,188,296,297], with only one prior example of measuring CO 2 in [292] (later discussed in [41]). Recently, several efforts have extended sensing capabilities to: 1) the mid-infrared for improved measurements of H 2 O [184,294], CO 2 [219,294], and the first measurements of CO [219,294] in a hydrocarbon-fueled model scramjet combustor, 2) 2D via tomography [124,190,126], 3) greater bandwidth for improved sensing in impulse facilities [244,159], and 4) the first in-flight TDLAS measurements for characterizing scramjet flow fields [26,27,28,298].…”

Section: Sensors For Scramjetsmentioning

confidence: 99%

“…Brown et al [28] presented the use of two independently developed TDLAS sensors for onboard measurements of O 2 in a hypersonic vehicle as part of the HI-FiRE I test campaign. The sensor developed by Zolo Technologies used scanned-wavelength direct absorption [26] while the sensor developed by Southwest Sciences used scanned-WMS [27]. Both sensors employed angled lines-of-sight across mock-inlet flow paths to infer the flow velocity from the Doppler-shifted absorption, with the ultimate goal of measuring O 2 mass flux entering the combustor.…”

Section: Sensors For In-flight Testsmentioning

confidence: 99%

See 1 more Smart Citation

Infrared laser-absorption sensing for combustion gases

Goldenstein

Spearrin

Jeffries

et al. 2017

Progress in Energy and Combustion Science

521

197

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Infrared laser-absorption spectroscopy (IR-LAS) sensors play an important role in diagnosing and characterizing a wide range of combustion systems. Of all the laser-diagnostic techniques, LAS is arguably the most versatile and quantitative, as it has been used extensively to provide quantitative, species-specific measurements of gas temperature, pressure, composition and velocity in both laboratory-and industrial-scale systems. Historically, most IR-LAS work has been conducted using tunable diode lasers, however, today's researchers have access to a wide range of light sources that provide unique sensing capabilities and convenient access to nearly the entire IR spectrum (≈1 to 20 μm). In particular, the advent of room-temperature wavelength-tunable mid-infrared semiconductor lasers (e.g., interband-and quantum-cascade lasers) and hyperspectral light sources (e.g., Fourierdomain mode-locked lasers, dispersed supercontinuum lasers, and frequency combs) has provided a number of unique capabilities that combustion researchers have exploited. The primary goal of this review paper is to document the recent development, application, and current capabilities of IR-LAS sensors for laboratory-and industrial-scale combustors and propulsion systems. A thorough review and description of the fundamental spectroscopy governing the accuracy of such sensors, and recent findings and databases that enable improved modeling of molecular absorption spectra will be provided. Modern light sources and the most commonly used diagnostic techniques are also discussed.

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“…Tunable diode laser absorption spectroscopy (TDLAS) has been widely used for concentration and temperature sensing in combustion and aerospace research [1][2][3][4][5][6]. The nonintrusive nature of TDLAS has also been exploited in industrial applications and in environmental monitoring [1,7,8].…”

Section: Introductionmentioning

confidence: 99%

Baseline correction for stray light in log-ratio diode laser absorption measurements

2014

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Log-ratio detection is a convenient technique for making temperature and concentration measurements using sensors based on tunable diode laser absorption spectroscopy. In many practical sensing applications, it is difficult to avoid stray light falling on the signal photodiode of the sensor. This stray light acts as noncommon-mode interference and introduces a systematic error in absorption measurements, which is not removed by baseline subtraction. This paper analyzes the factors that determine this systematic error and also presents a calibration method that can correct for it. This correction method is verified using a simple experiment.

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Laser-Based Mass Flow Rate Sensor Onboard HFiRE Flight 1

Cited by 12 publications

References 10 publications

Optical Diagnostics for High-Speed Flows

Optical Diagnostics for High-Speed Flows

Infrared laser-absorption sensing for combustion gases

Baseline correction for stray light in log-ratio diode laser absorption measurements

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