Use of an airborne Fraunhofer line discriminator for the detection of solar stimulated luminescence

Watson, R. D.; Hemphill, W. R.

doi:10.3133/ofr76202

Cited by 8 publications

(7 citation statements)

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“…Instead, passive detection of vegetation SIF using airborne systems came to rely on narrow absorption features of the incident radiation. To the best of our knowledge, the first reported airborne test over vegetation was performed with the MKII Fraunhofer Line Discriminator deployed onboard a helicopter (Watson and Hemphill, 1976).…”

Section: Line Scannersmentioning

confidence: 99%

Remote sensing of solar-induced chlorophyll fluorescence (SIF) in vegetation: 50 years of progress

Mohammed¹,

Colombo

Middleton

et al. 2019

Remote Sensing of Environment

489

267

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Remote sensing of solar-induced chlorophyll fluorescence (SIF) is a rapidly advancing front in terrestrial vegetation science, with emerging capability in space-based methodologies and diverse application prospects. Although remote sensing of SIF -especially from space -is seen as a contemporary new specialty for terrestrial plants, it is founded upon a multi-decadal history of research, applications, and sensor developments in active and passive sensing of chlorophyll fluorescence. Current technical capabilities allow SIF to be measured across a range of biological, spatial, and temporal scales. As an optical signal, SIF may be assessed remotely using high-resolution spectral sensors in tandem with state-of-the-art algorithms to distinguish the emission from reflected and/or scattered ambient light. Because the red to far-red SIF emission is detectable non-invasively, it may be sampled repeatedly to acquire spatio-temporally explicit information about photosynthetic light responses and steady-state behaviour in vegetation.Progress in this field is accelerating with innovative sensor developments, retrieval methods, and modelling advances. This review distills the historical and current developments spanning the last several decades. It highlights SIF heritage and complementarity within the broader field of fluorescence science, the maturation of physiological and radiative transfer modelling, SIF signal retrieval strategies, techniques for field and airborne sensing, advances in satellite-based systems, and applications of these capabilities in evaluation of photosynthesis and stress effects. Progress, challenges, and future directions are considered for this unique avenue of remote sensing.

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Section: Line Scannersmentioning

confidence: 99%

Remote sensing of solar-induced chlorophyll fluorescence (SIF) in vegetation: 50 years of progress

Mohammed¹,

Colombo

Middleton

et al. 2019

Remote Sensing of Environment

489

267

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“…From these observations, it is concluded that the highest values of luminescence occurs in the Galisteo Formation, which contains the uranophane sandstones. Luminescence in this formation ranges from 2.0 to 6.0 ppb rhodamine wt equivalent (100 counts equals 1 ppb, Watson and Hemphill, 1976), an order of magnitude less than measured with the FLD in ground configuration (Watson and Theisen, 1977). This difference is not surprising due to the larger resolution element viewed by the FLD at approx- y; / .…”

Section: Discussionmentioning

confidence: 68%

“…A field experiment was designed to: 1) Provide an early test of an airborne FLD imaging system. In earlier work (Watson and Hemphill, 1976), the FLD had been limited to operation in a non-imaging mode only; operation in an imaging mode is a recent modification.…”

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confidence: 99%

Mapping luminescence of uranium-bearing sandstones using an imaging Fraunhofer line discriminator

Watson¹,

Theisen²

1977

Open-File Report

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Measurements with a Fraunhofer Line Discriminator (FLD) imaging system over uranium-bearing sandstones in the Galisteo Formation, Sandia Mountains, New Mexico, show that luminescence of these sandstones is detectable and in general agreement with their distribution as mapped on the ground. The FLD imaging system coupled with a color television monitor and recorder, provides an inexpensive and reasonably accurate method of mapping the extent of luminescent materials, without the need of sophisticated aircraft image-motion compensation.

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“…Our results apply only to individual broadleaves or groups of pine needles. However, combined with results for pine and citrus canopies (Watson et al, 1973;Watson & Hemphill, 1976;Hemphill et al', 1977;McFarlane et al, 1980), they suggest that relationships of F to A might be found for whole trees or densely vegetated terrain where interference from background F is minimized. When incorporated into the design of hand-held instruments and airborne or spaceborne systems which are not yet commercially available (Hemphill & Settle, 1981), the Fraunhofer line-depth principle may contribute significantly to field studies of the relationship of F to A.…”

Section: Discussionmentioning

confidence: 87%

Chlorophyll fluorescence measured using the Fraunhofer line‐depth principle and relationship to photosynthetic rate in the field

Carter

Theisen

Mitchell

1990

Plant Cell & Environment

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Abstract. A field study was conducted to determine the relationship of solar‐excited chlorophyll a fluorescence to net CO2 assimilation rate in attached leaves. The Fraunhofer line‐depth principle was used to measure fluorescence at 656.3 nm wavelength while leaves remained exposed to full sunlight and normal atmospheric pressures of CO2 and O2. Fluorescence induction kinetics were observed when leaves were exposed to sunlight after 10 min in darkness. Subsequently, fluorescence varied inversely with assimilation rate. In the C4Zea mays, fluorescence decreased from 2.5 to 0.8 mW m‐2 nm‐1 as CO2 assimilation rate increased from 1 to 8 μmol m‐2 s‐1 (r2= 0.520). In the C3Liquidambar styraciflua and Pinus taeda, fluorescence decreased from 6 to 2 mW m‐2 nm‐1 as assimilation rate increased from 2 to 5 or 0 to 2 μmol m‐2 s‐1 (r2= 0.44 and 0.45. respectively). The Fraunhofer line‐depth principle enables the simultaneous measurement of solar‐excited fluorescence and CO2 assimilation rate in individual leaves, but also at larger scales. Thus, it may contribute significantly to field studies of the relationship of fluorescence to photosynthesis.

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Use of an airborne Fraunhofer line discriminator for the detection of solar stimulated luminescence

Cited by 8 publications

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Remote sensing of solar-induced chlorophyll fluorescence (SIF) in vegetation: 50 years of progress

Remote sensing of solar-induced chlorophyll fluorescence (SIF) in vegetation: 50 years of progress

Mapping luminescence of uranium-bearing sandstones using an imaging Fraunhofer line discriminator

Chlorophyll fluorescence measured using the Fraunhofer line‐depth principle and relationship to photosynthetic rate in the field

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Use of an airborne Fraunhofer line discriminator for the detection of solar stimulated luminescence

Cited by 8 publications

References 0 publications

Remote sensing of solar-induced chlorophyll fluorescence (SIF) in vegetation: 50 years of progress

Remote sensing of solar-induced chlorophyll fluorescence (SIF) in vegetation: 50 years of progress

Mapping luminescence of uranium-bearing sandstones using an imaging Fraunhofer line discriminator

Chlorophyll fluorescence measured using the Fraunhofer line‐depth principle and relationship to photosynthetic rate in the field

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Remote sensing of solar-induced chlorophyll fluorescence (SIF) in vegetation: 50 years of progress

Remote sensing of solar-induced chlorophyll fluorescence (SIF) in vegetation: 50 years of progress