Abstract:
A multichannel optical sensing device is disclosed, for measuring the outr sky luminance or illuminance or the luminance or illuminance distribution in a room, comprising a plurality of light receptors, an optical shutter matrix including a plurality of liquid crystal optical shutter elements operable by electrical control signals between light transmitting and light stopping conditions, fiber optic elements connected between the receptors and the shutter elements, a microprocessor based programmable control unit for selectively supplying control signals to the optical shutter elements in a programmable sequence, a photodetector including an optical integrating spherical chamber having an input port for receiving the light from the shutter matrix and at least one detector element in the spherical chamber for producing output signals corresponding to the light, and output units for utilizing the output signals including a storage unit having a control connection to the microprocessor based programmable control unit for storing the output signals under the sequence control of the programmable control unit.
Abstract:
The fundamental-mode field radius `w` is a key parameter in characterizing optical fibers. `w` is a function of P, .theta. and .lambda. where P is the far-field power passing through a circular aperture subtending a solid angle of 2.theta. at the fiber end face and .lambda. is the center wavelength of transmitted length. `w` is derived by moving a fixed diameter aperture along an axis extending between the test fiber end surface and a photodetector so as effectively to vary .theta.. At each location the power P incident on the photodetector and the corresponding acceptance angle .theta. are measured. A microprocesor is programmed to compute from the range of measured values of .theta. and P, the value of mode field radius for a particular transmission wavelength .lambda..
Abstract:
The fundamental-mode field radius 'w' is a key parameter in characterizing optical fibers. 'w' is a function of P, θ and A where P is the far-field power passing through a circular aperture subtending a solid angle of 2θ at the fiber end face and λ is the center wavelength of transmitted light. 'w' is derived by moving a fixed diameter aperture (20) along an axis extending between the test fiber end surface and a photodetector (24) so as effectively to vary θ. At each location the power P incident on the photodetector (24) and the corresponding acceptance angle θ are measured. A microprocessor (28) is programmed to compute from the range of measured values of θ and P, the value of mode field radius for a particular transmission wavelength λ.
Abstract in simplified Chinese:本发明提供一种构造简单、能实现高精度测定之发光二极管的光量测定设备。光量测定设备3具备:一受光模块1,其系与LED101相向配置,接收从LED101所发出之放射状的光,并测定其光量;一探针109,其系供给电力至LED101,以使LED101发光;以及一受光范围设置机构,其系根据相对于LED101的发光中心轴LCA之角度θ,对从LED101发出的光之中使受光模块1受光之光范围即受光范围进行设置。在一切割片103b上排列有多个LED101。受光范围设置机构在受光模块1接收由多个排列之LED101所发出的光时,将受光范围设置为不论LED101的排列形态为何,使接收到的光之光量的测定误差在规定比率以下。