Computer modeling of integrating spheres

Crowther, Blake G.

doi:10.1364/ao.35.005880

Cited by 20 publications

(4 citation statements)

References 7 publications

(8 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Figure 1, the radius of the powersphere is R. The laser with a luminous flux of Φ is incident into the powersphere from the entrance hole and irradiates on the inner wall of the powersphere, with a direct irradiation area of S. The directly irradiated light is reflected by the inner wall and transmitted to the other inner walls of the powersphere. The laser finally forms a uniform distribution after multiple reflections on the inner wall [15][16][17][18]. Assuming the small surface element of any point in the direct irradiation area S is dA, and the luminous flux irradiated on the surface element is dΦ, then the illumination EA at point A is:…”

Section: Basic Principle Of Powerspherementioning

confidence: 99%

Design and Fabrication of Large-Size Powersphere for Wireless Energy Transmission via Laser

Pan

Zhang

et al. 2021

Photonics

View full text Add to dashboard Cite

The powersphere is a device used for maximizing the conversion of light in wireless energy transmission via laser. It is a spherical structure made up of thousands of photovoltaic cells. Due to the large dimensions and existence of many holes in the spherical surface, there are some drawbacks in machining, such as limited movement space of the machines, long cycle, low precision, and high cost. In this context, with a powersphere irradiated by the laser as the model, the principle of powersphere is deduced theoretically. It is proven that the illuminance value at any position on the inner wall of the powersphere is equal, and the calculation formula of this value is derived. Based on this theory and the comparative analysis of processing methods and the results of processing experiments, the structure of the powersphere is designed. The experimental processing of the powersphere is carried out by selecting the welding method. Finally, two hemispherical powersphere frames are processed, which are connected by screws to form a ball frame for the installation of photovoltaic cells. The results show that the improved design and fabricating method can process the powersphere quickly, accurately, and economically. A comparative experiment of powersphere and photovoltaic panel was carried out. The experimental results show that the powersphere has the function of light uniformity and repeated use of laser. So, the designed and processed powersphere is consistent with the theoretical analysis.

show abstract

Section: Basic Principle Of Powerspherementioning

confidence: 99%

Design and Fabrication of Large-Size Powersphere for Wireless Energy Transmission via Laser

Pan

Zhang

et al. 2021

Photonics

View full text Add to dashboard Cite

show abstract

“…An extensive area for MCM application is the modelling of integrating spheres: for reflectivity and transmittance measurements [18], for use as a calibrated diffuser [19], for flux comparison of various sources of radiation [20], for building large-aperture uniform sources, etc. Numerical modelling of integrating spheres becomes even more important in the realization of the lumen based on a black-body source and a spherical integrator of the luminous flux [21].…”

Section: Integrating Spheresmentioning

confidence: 99%

Monte Carlo method in optical radiometry

Prokhorov

1998

Metrologia

View full text Add to dashboard Cite

State-of-the-art in the application of the Monte Carlo method (MCM) to the computational problems of optical radiometry is discussed. The MCM offers a universal technique for radiation transfer modelling based on the stochastic approach. Developments of the original MCM algorithms and software for calculation of effective emissivities of black bodies, absorption characteristics of cavity radiometers and photometric properties of integrating spheres are used for designing advanced optical instruments. The capabilities of the developed software are illustrated by several examples. The techniques of convergence improvement and special time-saving algorithms are outlined.

show abstract

“…The common disadvantages of these methods are well known: their applicability to only Lambertian surfaces and the growth of computational difficulties with the sophistication of system geometry. In the last decades, very important results in computer modeling of integrating sphere have been obtained with the help of the Monte Carlo method [7][8][9][10][11][12][13] The foundation of this technique is the probabilistic treatment of radiation-matter interactions. This approach allows construction of a stochastic model of the system being modeled and an assessment of its parameters with a large number of ray tracing implementations.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of an integrating sphere radiation source

Prokhorov

Hanssen

2002

SPIE Proceedings

View full text Add to dashboard Cite

Integrating spheres are often used as calibration sources providing uniform radiance within a solid angle and/or uniform irradiance at a distance. The best performance in such a system can be achieved if one is able to evaluate as well as predict the important characteristics of the sphere system's output, such as the spatial and angular distributions of radiance over the exit port, or the distribution of irradiance at the external plane of calibration. We have developed the algorithms and specialized software based on Monte Carlo techniques to solve the problem of radiation transfer inside an integrating sphere containing several point sources and conical annular baffle. The new algorithm employs backward ray tracing coupled with the "shadow rays" technique. As a timesaving procedure, the axial symmetry of the sphere and the superposition principle are used to substitute the sum of single source radiation fields rotated through a specific angle, for the radiation field of the complete multiple source sphere. The random (due to the stochastic character of the Monte Carlo method) component of uncertainty for the radiance or irradiance results is less than 0.1%. The results of numerical experiments are used to establish the performance variation as a function of the reflectance and specularity of the sphere wall, the number of radiation sources, the type of baffle used, and the angular distribution of their radiant intensity.

show abstract

Computer modeling of integrating spheres

Cited by 20 publications

References 7 publications

Design and Fabrication of Large-Size Powersphere for Wireless Energy Transmission via Laser

Design and Fabrication of Large-Size Powersphere for Wireless Energy Transmission via Laser

Monte Carlo method in optical radiometry

Numerical modeling of an integrating sphere radiation source

Contact Info

Product

Resources

About