Stereoscopic spectral filter for researching micro-objects

2021 ◽  
Author(s):  
V.I. Batshev ◽  
◽  
N.A. Bulygina ◽  
Keyword(s):  
Spectral Filter

Growth Response and Carbohydrate Status of Gibberellin-treated Spectral Filter-grown Chrysanthemum Plants

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 522c-522
Author(s):  
Anuradha Tatineni ◽  
Sonja L. Maki ◽  
Nihal C. Rajapakse
Keyword(s):  
Plant Height ◽  
Growth Regulation ◽  
Red Light ◽  
Sucrose Phosphate Synthase ◽  
Spectral Filter ◽  
Spectral Filters ◽  
Wide Range ◽  
Ornamental Crops ◽  
Carbohydrate Levels ◽  
Carbohydrate Status

Interest in the use of non- (or less) chemical methods to reduce the height of ornamental crops has increased tremendously. Manipulation of greenhouse light quality is one alternative for plant growth regulation. We have shown that eliminating far-red light from the greenhouse environment with liquid CuSO4 spectral filters is effective in reducing the height of a wide range of plants though plant carbohydrate status is also altered under CuSO4 filter. In previous studies, application of GA3 reversed both the reduction of plant height and carbohydrate status of CuSO4 spectral filter grown plants. It has been proposed that GAs enhance the activity of the enzyme sucrose phosphate synthase to regulate carbohydrate levels. In the present study the role of exogenously applied GA19, GA1, and GA3 in overcoming the reduction of plant height and carbohydrate levels was investigated. Chrysanthemum plants were treated weekly for 4 weeks with saturating doses of GA19, GA1 and GA3 (25 μg) or the growth retardants paclobutrazol and prohexadione. GA1 was also applied with paclobutrazol and prohexadione to assess whether response to GAs is altered under CuSO4 filter. GA1 and GA3 promoted growth similarly under control or CuSO4 filter. GA19 was least effective in promoting growth under CuSO4 filter. In summary, these results suggest that gibberellin physiology is altered under spectral filters with the conversion of GA19 a possible point of regulation. The correlation between the carbohydrate status and the growth of the plants will be discussed.

scholarly journals Experimental demonstration of spectral domain computational ghost imaging

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Piotr Ryczkowski ◽  
Caroline G. Amiot ◽  
John M. Dudley ◽  
Goëry Genty
Keyword(s):  
Signal To Noise Ratio ◽  
Michelson Interferometer ◽  
Spectral Domain ◽  
Proof Of Concept ◽  
Ghost Imaging ◽  
Spectral Measurements ◽  
Spectral Filter ◽  
Wavelength Division ◽  
Spectral Encoding ◽  
Light Effects

AbstractWe demonstrate computational spectral-domain ghost imaging by encoding complementary Fourier patterns directly onto the spectrum of a superluminescent laser diode using a programmable spectral filter. Spectral encoding before the object enables uniform spectral illumination across the beam profile, removing the need for light collection optics and yielding increased signal-to-noise ratio. In addition, the use of complementary Fourier patterns allows reduction of deleterious of parasitic light effects. As a proof-of-concept, we measure the wavelength-dependent transmission of a Michelson interferometer and a wavelength-division multiplexer. Our results open new perspectives for remote broadband spectral measurements.

Thulium-doped fibre broadband source for spectral region near 2 micrometers

2016 ◽  
Vol 24 (4) ◽  
Author(s):  
M. Písařík ◽  
P. Peterka ◽  
J. Aubrecht ◽  
J. Cajzl ◽  
A. Benda ◽  
...  
Keyword(s):  
Spontaneous Emission ◽  
Ring Laser ◽  
Amplified Spontaneous Emission ◽  
Full Width ◽  
Spectral Filter ◽  
Double Pass ◽  
Broadband Light Source ◽  
And Performance ◽  
Fibre Characteristics ◽  
Laser Setup

AbstractWe demonstrated two methods of increasing the bandwidth of a broadband light source based on amplified spontaneous emission in thulium-doped fibres. Firstly, we have shown by means of a comprehensive numerical model that the full-width at half maximum of the thulium-doped fibre based broadband source can be more than doubled by using specially tailored spectral filter placed in front of the mirror in a double-pass configuration of the amplified spontaneous emission source. The broadening can be achieved with only a small expense of the output power. Secondly, we report results of the experimental thulium-doped fibre broadband source, including fibre characteristics and performance of the thulium-doped fibre in a ring laser setup. The spectrum broadening was achieved by balancing the backward amplified spontaneous emission with back-reflected forward emission.

Position Effect of Spectral Filter on Properties of Highly Chirped Pulses in an All-Normal-Dispersion Fiber Laser

2009 ◽  
Vol 45 (10) ◽  
pp. 1284-1288 ◽  
Author(s):  
Chunmei Ouyang ◽  
Lu Chai ◽  
Hui Zhao ◽  
Minglie Hu ◽  
Youjian Song ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Position Effect ◽  
Spectral Filter ◽  
Normal Dispersion ◽  
Chirped Pulses

Comparison of Mosaic Patterns for Spectral Filter Arrays

2018 ◽  
Author(s):  
Davit Gigilashvili ◽  
Jon Yngve Hardeberg ◽  
Jean-Baptiste Thomas
Keyword(s):  
Spectral Filter

scholarly journals Intercomparison of integrated IASI and AATSR calibrated radiances

2009 ◽  
Vol 9 (2) ◽  
pp. 8101-8119 ◽  
Author(s):  
S. M. Illingworth ◽  
J. J. Remedios ◽  
R. J. Parker
Keyword(s):  
Weather Prediction ◽  
Radiometric Calibration ◽  
Spectral Filter ◽  
Filter Function ◽  
Brightness Temperatures ◽  
Data Points ◽  
Cross Calibration ◽  
Sky Conditions ◽  
Error Constraint

Abstract. The mission objectives of the Infrared Atmospheric Sounding Interferometer (IASI) are driven by the needs of the Numerical Weather Prediction (NWP) and climate monitoring communities. These objectives rely upon the IASI instrument being able to measure top of atmosphere radiances accurately. This paper presents a technique and results for the validation of the radiometric calibration of radiances for IASI, using a cross-calibration with the Advanced Along Track Scanning Radiometer (AATSR). The AATSR is able to measure Brightness Temperature (BT) to an accuracy of 30 mK, and by applying the AATSR spectral filter function to the IASI measured radiances we are able to compare AATSR and IASI Brightness Temperatures. By choosing coincidental data points that are over the sea and in clear sky conditions, a threshold of homogeneity is derived. It is found that in these homogenous conditions, the IASI BTs agree with those measured by the AATSR to within 0.5 K, with a precision of order 0.04 K. These results indicate that IASI is likely to be meeting its target objective of 0.5 K accuracy. It is believed that a refinement of the AATSR spectral filter function will hopefully permit a tighter error constraint on the quality of the IASI data and hence further assessment of the climate quality of the radiances.

scholarly journals Applications of nanotechnology with hybrid Photovoltaic/Thermal systems

2020 ◽  
pp. 1-15
Author(s):  
Mohammed Alktranee
Keyword(s):  
Thermophysical Properties ◽  
Base Fluid ◽  
Volume Fraction ◽  
Working Fluid ◽  
Spectral Filter ◽  
Thermal Systems ◽  
Cooling Fluid ◽  
Numerical Studies ◽  
The Impact ◽  
T System

This paper appears potential of use nanofluids as a working fluid with the photovoltaic/thermal (PV/T) systems as an alternative of the conventional liquids in improves the efficiency of the hybrid PV/T system. The review highlights the impact of some parameters (base fluid, volume fraction, the concentration of nanoparticles, surfactants, shape, and size of nanoparticles) on nanofluids' thermophysical properties and their effect on the PV/T system's efficiencies. Hence, it discusses the PV/T behavior, which uses different nanofluids based on previous experimental, analytical, and numerical studies. The review concluded that using nanofluid as a cooling fluid or spectral filter contributes by enhancing the performance and increasing the PV/T system's efficiency. Thus, each type of nanofluids has certain features that contribute to removing the PV cells' excess heat by cooling it, contributing to its work's stability, and increasing its productivity. Nanofluids thermophysical properties play an intrinsic role by enhancing nanofluids' performance, thus positively reflecting on the PV/T system's performance. Despite the variation in the values of thermal and electrical efficiency, Most of the studies that used nanofluids have achieved encouraging results that appeared by improving the performance of PV/T systems.

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