Some Characteristics of the Shadow Produced by a Horizontal Disk Setting under a Vertical Linear Light Source

Fujiwara, Yoshiteru; Ohtani, Yoshihiko

doi:10.2150/jieij1917.61.6_303

Cited by 2 publications

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“…(1) Direction of the particles emitted from the light source By the luminous intensity distribution of the equation ( 1), the number of the particles in the direction e is Pe = Po (a'cos e + b･cos2 e) (4) where; Po is the number of the particles in the direction perpendicular to the light source surf ace.…”

Section: Illuminance Calculation By Monte Carlo Methodsmentioning

confidence: 99%

“…J:T = . po ' cos e ' de (9) After fixing Po by the equation ( 6), the relation of emitting direction e to the uniform random numbers is determined as = (sin e + 1) 1 2 (10) (4) Reflection and absorption of the particles on the surface of the shadow caster When the straight line which indicates the flying locus of the particle emitted from the light source or the surface of the room intersects in the circle which indicates the cross section of the column as the shadow caster, it is considered that the particle collides with a certain point on the shadow caster. As for reflection and absorption, the same idea as the above items ( 2) and ( 3) is applicable supposing a tangential plane on the collided point of the shadow caster (See Fig.…”

Section: Illuminance Calculation By Monte Carlo Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Shadow Characteristics of a Column in an Infinite length Room.

Ohtani

Ohta

Takubo³

et al. 1993

J. Light & Vis. Env.

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This paper deals with characteristics of the illuminance and the shadow factor within a shadow affected by reflected light, in an infinite length room which has a ribbon-shaped light source and a column (a shadow caster) of infinite length.Calculations are done by Monte Carlo method which is widely used lately to predict'the illuminance distribution of a room. First, Monte Car[o method for numerical calculations is presented to obtain the illuminance within a shadow. Next, some experiments are made under the same conditions as the calculations. And, the experimental results are compared with the calculated results. As there is not a large difference seen between them, it is confirmed that the above method is suitable.Finally, the characteristics of the illuminance and the shadow factor on the floor at the varied reflectances of the room surface and the shadow caster are obtained and examined.

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Section: Illuminance Calculation By Monte Carlo Methodsmentioning

confidence: 99%

Section: Illuminance Calculation By Monte Carlo Methodsmentioning

confidence: 99%