Fraunhofer line-depth sensing applied to water

Test of data compilation procedures for Fraunhofer line discriminator

“…The necessity of one or more additional correction factors to permit rationalization of FLD records and interpretation of dye concentrations has been explained in a previous report (Stoertz, 1969 )x. It was concluded that the principal factors still to be accounted for are luminescence efficiency of the rhodamine dye and instrumental sensitivity, and was almost invariably lower than the "zero" setting of the recorder pen.…”

“…This utilizes the theoretical formula derived previously (Stoertz, 1969 equation #36 (a, tc' -9' ' cti I cwi' cte , cwe, h and f) have been described above.…”

Snapshot imaging Fraunhofer line discriminator for detection of plant fluorescence

“…sunlight), are preferred over the former. High spectral resolution is essential for detection of passive fluorescence [14] . As a result, spatial heterodyne spectroscopy (SHS), which has superior spectral resolution compared to grating spectrometers, is chosen as the theoretical basis of our design [15] .…”

“…The snapshot imaging technique collects all spatial and spectral voxels simultaneously and thereby minimizes its susceptibility to temporal registration errors, while the system's high throughput can also be attributed to the use of snapshot imaging. The quantification of fluorescence is performed by measuring the difference in intensities of ambient light spectrum and fluorescence spectrum, at a particular wavelength [14] . Our system is calibrated to detect plant fluorescence around 656 nm, i.e.…”