scholarly journals Light Intensity Control Using Polaroids

2022 ◽  
Vol 10 (1) ◽  
pp. 585-589
Author(s):  
Mansi Kadam
Keyword(s):  
Light Intensity ◽  
Light Wave ◽  
Polarized Light ◽  
Light Sources ◽  
Variable Intensity ◽  
Unpolarized Light ◽  
Propagation Of Light ◽  
Intensity Control ◽  
Pass Through ◽  
Polarization Of Light

Abstract: In today’s era of illuminating devices, there are a wide variety of devices available in aesthetics but the none with variable intensity of light. Using the basic principle of polarization of light using a Polaroid filter or polarizer, the designing of a light intensity control was done. The polarizing angle of the filter decides the intensity of the light that would pass through the filters. According to the principle of propagation of light, the electric and magnetic vibrations of a light wave occur perpendicularly to each other. A light wave that is vibrating in more than one plane is known as unpolarized light. The light emitted by the sun, by a lamp or a tube light are all unpolarized light sources. The other kind of wave is a polarized wave. A Plane polarized light vibrates on only one plane. The process of transforming unpolarized light into the polarized light is known as polarization. Using the same principle and with the use of a LDR (light dependent resister) as a sensor to sense the intensity of the surrounding light and then rotate the polaroid filter sheets accordingly using a stepper motor for the required change in intensity. The sensing and sending of feedback and subsequent rotation of the Polaroid filter sheets would be automated by ATMEGA32 microcontroller and L293D. Keywords: Polaroids, LDR, Light Variation, ATMEGA32, L293D

The Analysis of the Experiment of Polarized Light in Uniaxial Dichroism Crystal

2013 ◽  
Vol 300-301 ◽  
pp. 1267-1270
Author(s):  
Nan Yang Ye ◽  
Da Hai Han
Keyword(s):  
Distribution Function ◽  
Light Intensity ◽  
Intensity Distribution ◽  
Polarized Light ◽  
Light Intensity Distribution ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Elliptically Polarized Light ◽  
Polarization Of Light ◽  
Elliptically Polarized

In the experiment of the polarization of light, circularly polarized light can’t be got though all instruments are carefully adjusted and the polarized light we get is generally regarded as elliptically polarized light. We analyzed the process and find the light we get isn’t circularly polarized light or elliptically polarized light as usually thought and deduced the light intensity distribution function and it can fit the experimental results with small errors.

scholarly journals Laser Imaging Nephelometer for aircraft deployment

2021 ◽  
Author(s):  
Adam T. Ahern ◽  
Frank Erdesz ◽  
Nicholas L. Wagner ◽  
Charles A. Brock ◽  
Ming Lyu ◽  
...  
Keyword(s):  
Polarized Light ◽  
Field Measurements ◽  
High Temporal Resolution ◽  
Light Sources ◽  
Laser Imaging ◽  
Instrument Function ◽  
Scattering Coefficients ◽  
Smoke Plumes ◽  
Linearly Polarized ◽  
Polarization Of Light

Abstract. Validation of remote sensing retrievals of aerosol microphysical and optical properties requires in situ measurements of the same properties. We present here an improved imaging nephelometer for measuring the directionality and polarization of light (i.e. polarimetry) scattered at two wavelengths (405 nm and 660 nm) with high temporal resolution. The instrument was designed for airborne deployment and is capable of ground-based measurements as well. The Laser Imaging Nephelometer (LiNeph) uses two orthogonal detectors with wide-angle lenses and linearly polarized light sources to measure both the phase function, P11(θ), and degree of linear polarization, -P12/P11(θ). In this work, we will describe the instrument function and calibration, as well as data acquisition and reduction. The instrument was first deployed aboard the NASA DC-8 during the 2019 FIREX-AQ campaign. Here, we present field measurements of smoke plumes that show that the LiNeph has sufficient resolution for 0.24 Hz polarimetric measurements at two wavelengths, 405 and 660 nm, at integrated scattering coefficients ranging from 50–80,000 Mm−1.

scholarly journals III. On the Plane and Angle of Polarization of Light Reflected at the surface of a Crystal

1844 ◽  
Vol 15 (1) ◽  
pp. 37-65
Author(s):  
P. Kelland
Keyword(s):  
Polarized Light ◽  
The Subject ◽  
Polarization Of Light

The present Memoir is, to a certain extent, a continuation of one which the author presented to the Society in December 1838, and which has since been published in the thirteenth volume of the Transactions. Other motives, however, than the desire of completing the subject, have influenced him in producing the following analysis. A very important point in the hypothetical conditions which Fresnel assumed to hold with respect to polarized light, has, of late, been warmly combated in various quarters. Fresnel supposed that light polarized in a given plane consists of vibrations of such a nature that the motion is perpendicular to that plane. Neumann and other writers contend that the very opposite is the fact. We hope to be able to offer evidence of some little weight in favour of the former view; at the same time we do not pretend to shew the actual impossibility of the truth of the latter.

Long-range correlations of the polarized-light intensity in disordered samples

JETP Letters ◽  
2009 ◽  
Vol 89 (11) ◽  
pp. 547-552 ◽  
Author(s):  
E. E. Gorodnichev ◽  
A. I. Kuzovlev ◽  
D. B. Rogozkin
Keyword(s):  
Light Intensity ◽  
Long Range ◽  
Polarized Light ◽  
Long Range Correlations

scholarly journals PSB27: A thylakoid protein enabling Arabidopsis to adapt to changing light intensity

2015 ◽  
Vol 112 (5) ◽  
pp. 1613-1618 ◽  
Author(s):  
Xin Hou ◽  
Aigen Fu ◽  
Veder J. Garcia ◽  
Bob B. Buchanan ◽  
Sheng Luan
Keyword(s):  
Photosystem Ii ◽  
Light Intensity ◽  
Light Adaptation ◽  
Light Exposure ◽  
Starch Accumulation ◽  
State Transitions ◽  
Potential Candidate ◽  
Subsequent Work ◽  
Variable Intensity ◽  
Changing Light

In earlier studies we have identified FKBP20-2 and CYP38 as soluble proteins of the chloroplast thylakoid lumen that are required for the formation of photosystem II supercomplexes (PSII SCs). Subsequent work has identified another potential candidate functional in SC formation (PSB27). We have followed up on this possibility and isolated mutants defective in the PSB27 gene. In addition to lack of PSII SCs, mutant plants were severely stunted when cultivated with light of variable intensity. The stunted growth was associated with lower PSII efficiency and defective starch accumulation. In response to high light exposure, the mutant plants also displayed enhanced ROS production, leading to decreased biosynthesis of anthocyanin. Unexpectedly, we detected a second defect in the mutant, namely in CP26, an antenna protein known to be required for the formation of PSII SCs that has been linked to state transitions. Lack of PSII SCs was found to be independent of PSB27, but was due to a mutation in the previously described cp26 gene that we found had no effect on light adaptation. The present results suggest that PSII SCs, despite being required for state transitions, are not associated with acclimation to changing light intensity. Our results are consistent with the conclusion that PSB27 plays an essential role in enabling plants to adapt to fluctuating light intensity through a mechanism distinct from photosystem II supercomplexes and state transitions.

Conversion of unpolarized light to polarized light with greater than 50% efficiency by photorefractive two-beam coupling

2000 ◽  
Vol 25 (4) ◽  
pp. 257 ◽  
Author(s):  
John E. Heebner ◽  
Ryan S. Bennink ◽  
Robert W. Boyd ◽  
R. A. Fisher
Keyword(s):  
Polarized Light ◽  
Unpolarized Light ◽  
Beam Coupling

scholarly journals Experimental researches on the elliptic polarization of light

1843 ◽  
Vol 4 ◽  
pp. 394-394
Keyword(s):  
Experimental Investigation ◽  
Polarized Light ◽  
Tabular Form ◽  
Metallic Surfaces ◽  
Analytical Results ◽  
Elliptic Polarization ◽  
Polarization Of Light ◽  
Experimental Researches

This paper contains an experimental investigation of the phenomena of elliptic polarization resulting from the reflexion of polarized light from metallic surfaces, and the theory on which they are explicable; the analytical results being given in a tabular form, and applied to the cases of the experiments themselves.

Automatic Room Light Intensity Control Using Soft Controller

2020 ◽  
pp. 349-356
Author(s):  
C. Subramani ◽  
Varun Sah ◽  
G. R. Vishal ◽  
Abhimanyu Sharma ◽  
Indranil Gupta ◽  
...  
Keyword(s):  
Light Intensity ◽  
Room Light ◽  
Intensity Control
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