Abstract:
A source of illumination of constant color temperature and intensity including a lamp 41 the color temperature of the light from which is dependent on the power applied to the lamp 41. There is a device 154 for measuring the intensity of portions of the spectrum of the light and for providing signals indicative of those intensities. Means 174, 45 responsive to the signals adjust the power to achieve the selected color temperature. A light modulator 48 adjusts the intensity without affecting color temperature. There is a spherical mirror 46 centered on the lamp 41 and the modulator 48 is located between the lamp 41 and the mirror 46 and controls the brightness of the image of the lamp 41 formed on the lamp 41 by the spherical mirror 46.
Abstract:
Le dispositif permettant de collecter le rayonnement d'une source de lumière (20) à l'intérieur d'un miroir concave, comporte un réflecteur (10') cylindrique ou parabolique ou elliptique ayant une symétrie de rotation, qui est recouvert par un réflecteur du rayon de retour (40), courbe ou plan, présentant une ouverture (42). Le réflecteur du rayon de retour (40) renvoie une partie de la lumière vers la zone de la source (20) et provoque, à la suite de la transparence partielle de cette zone, l'émission d'un faisceau de lumière intensif et quasi-parallèle à travers l'ouverture (42). Cette lumière peut par exemple être amenée, après passage d'un élément monochromateur (31), vers une cellule de mesure à gaz (68). Le miroir (57) ayant une forme complémentaire à celle du réflecteur (10', 10") sert à augmenter l'efficacité optique du dispositif. Le signal de mesure peut être capté par un détecteur de lumière ou un microphone (69). Dans ce dernier cas, il est nécessaire d'utiliser un dispositif d'échange de gaz découplé acoustiquement qui peut être réalisé par exemple par des tubes capillaires remplis par le fluide (75, 75').
Abstract:
A pulse oximetry measurement system uses a pseudo-random noise generator to stimulate one or more light emitting diodes (LEDs). The light amplitudes from these LEDs, after passing through a part of a body, are detected by a phototransistor or photodiode and digitized with an analog-to-digital converter (ADC). The digitized ADC light amplitude values are re-correlated with the outgoing pseudo-random noise stimulus. Spread spectrum techniques are known for their noise mitigation properties, and ability to pass multiple signals through the same medium without interference. Thus, these measurements can be performed substantially simultaneously with minimal interference from each other. The pulse oximetry measurement system correlates the measured light intensities using pseudo-random noise generation and phase division multiplexing, and computes the measured and correlated peak-to-peak detected light amplitudes to obtain a ratio between these light amplitudes for determining oxygen saturation in the blood, and may also be used for heart rate monitoring.
Abstract:
The present invention discloses a detection system with quantum light source, it includes a quantum light source module and a detection module, wherein the quantum light source module is composed of plural quantum light sources and illuminating an object under test to generate an object image, while the detection module detects the object image and performs detection or analysis. With the implementation of the present invention, low implementation cost is made possible by dispensing with a complex production process and complicated manufacturing equipment; relatively small space taken up by the quantum light sources allows the detection system to be used in a variety of applications; accurate and high-intensity light output facilitates identification of the characteristics of a to-be-tested object, lowers the error rate of detection, and enhances detection efficiency substantially; and can be used to detect, identify, or discriminate physiological signals correctly.
Abstract:
The invention relates to a lighting device by means of which a surface can be particularly uniformly illuminated, in particular for scientific or quality control purposes. In particular, the invention relates to a lighting device for homogeneously illuminating an object, which device comprises a homogenisation device (10) and is suitable for connection to a light source, said homogenisation device (10) having an inlet opening (12), an inlet chamber (16) arranged behind the inlet opening (12), an intermediate chamber (18), an outlet chamber (20), and an outlet opening (22) arranged behind the outlet chamber (20), wherein the inlet chamber (16), the intermediate chamber (18) and the outlet chamber (20) each have an outer surface (26) and an inner surface (24), wherein the inlet chamber (16) extends along a first main axis (H1) and the outlet chamber (20) extends along a second main axis (H2), and a light source arranged in the region of the inlet opening (12) can send light through the inlet chamber (16), the intermediate chamber (18), the outlet chamber (20) and the outlet opening (22) onto an object to be illuminated, characterised in that a beam of light cannot travel in a straight line from a point of the inlet opening (12) to a point of the outlet opening (22), and that at least the respective inner surfaces (24) of the inlet chamber (16), the intermediate chamber (18) and the outlet chamber (20) are diffusely reflective in at least one respective first region, such that a beam of light reflected on one of these inner surfaces (24), said beam illuminating a first reference surface (R1) with a first irradiance when incident, when emergent illuminates a second reference surface (R2) of the same size with a second irradiance that is lower than the first irradiance by at least a factor of 3, when both reference surfaces (R1, R2) are positioned at a distance of 10 mm from the reflection point (P).
Abstract:
The present disclosure relates to a reflective optical sensor module, an optical sensing accessory, and an optical sensing device. A reflective optical sensor module comprises a light source (110) and a first encapsulant (111), a photodetector (120) and a second encapsulant (121), an electrode (170) and a substrate (140). The light source (110) is configured to convert electric power into radiant energy and to emit light to an object surface. The photodetector (120) is configured to receive the light from an object surface and to convert radiant energy into electrical current or voltage. The electrode (170) is configured to detect an external circuit formed by the contact with an object surface. The optical sensing accessory and the optical sensing device comprise the reflective optical sensor module and other electronic modules to have further applications.
Abstract:
The present application discloses a LED-based solar simulator light source having at least one LED array formed by multiple LED groups of LED assemblies, at least one field flattening device, at least one diffractive element, and at least one optical element configured to condition the broad spectrum light source output signal and direct the light source output signal to a work surface.