摘要:
The present invention concerns a method for working out the angular position of a rotating element which is mounted in a fixed frame, consisting in using at least one light source emitting a beam of light in the direction of a fixed sensor and using computing means for processing an output signal of the sensor, characterized in that it consists in: - a) arranging the light source with respect to the rotating element and of the sensor in a way so as to induce an interaction between the beam of light and the sensor which depends on the angular position of the rotating shaft, - b) arranging on the path of the beam of light, in a fixed position with respect to the sensor, a perforated mask which presents a repetitive pattern of perforations, - c) detecting shadows generated by the mask on the sensor, - d) processing the output signal of the sensor for determining the position of the shadows on the sensor, - e) and computing the angular position of the rotating element by using the position of the shadows.
摘要:
The present invention concerns a method for working out the angular position of a rotating element which is mounted in a fixed frame, consisting in using at least one light source emitting a beam of light in the direction of a fixed sensor and using computing means for processing an output signal of the sensor, characterized in that it consists in: - a) arranging the light source with respect to the rotating element and of the sensor in a way so as to induce an interaction between the beam of light and the sensor which depends on the angular position of the rotating shaft, - b) arranging on the path of the beam of light, in a fixed position with respect to the sensor, a perforated mask which presents a repetitive pattern of perforations, - c) detecting shadows generated by the mask on the sensor, - d) processing the output signal of the sensor for determining the position of the shadows on the sensor, - e) and computing the angular position of the rotating element by using the position of the shadows.
摘要:
La présente invention concerne un capteur rotatif optique de mesure de position angulaire absolue destiné à être utilisé en combinaison avec des moteurs miniatures tournant à des vitesses de plusieurs centaines de milliers de tours/minute. La plupart des capteurs de position rotatifs actuels utilisent un disque fixé au rotor, sur lequel est marqué un code, ainsi qu'un capteur qui lit la valeur du code à un ou plusieurs endroits particuliers du disque. Contrairement à ces capteurs, le système proposé utilise la totalité du marquage du disque pour le calcul de la position absolue. Cette particularité confère à l'invention plusieurs avantages, dont certains sont cumulables : • dimension très faible du capteur, • possibilité d'atteindre des vitesses de rotation de l'ordre de 600'000 tours/min, • augmentation de la résolution par interpolation si le flou de mouvement est négligeable, c.à.d. à des vitesses de rotation réduites (max 20'000 tours/min), • compensation automatique du décentrage de l'axe, • calibration adaptative en fonction de la non-uniformité de l'éclairage et du fixed-pattern du capteur d'image.
摘要:
The present invention concerns a method for working out at least the angular position of a rotating element which is mounted in a fixed frame, consisting in using at least one fixed light source emitting a beam of light in the direction of a fixed sensor, arranging the light source with respect to the rotating element and of the sensor in a way so as to induce an interaction between the beam of light and the sensor, which depends on the angular and the radial position of the rotating element and using computing and processing means for providing a value of the angular position dependent of the output signal of the sensor, characterized in that it consists in: a) arranging on the path of the beam of light a code-disc which presents a regular two dimensional pattern of transparent and opaque areas and an absolute code and which is integral in rotation with the rotating element, b) using the image casted by the code-disc on the sensor for determining the eccentricity of the code-disc in dependence of the angular position of the rotating element, c) using the eccentricity for compensating the value of the computed angular position, d) and computing a corrected angular position of the rotating element.
摘要:
The present invention discloses a one-dimension position measurement system comprising: - a first ruler, on which is applied a first one-dimension code, - a second ruler, on which is applied a second one-dimension code, - a camera for acquiring simultaneously a picture of a portion of the first one-dimension code and of a portion of the second one-dimension code, and - some processing means. According to the invention, the second ruler is disposed parallel to the first ruler, one end of said first ruler being tied to one end of said second ruler, the other end of said first and second rulers being free. Moreover, said first and second rulers are made of material having different temperature expansion coefficients.
摘要:
The present invention concerns a method for working out the angular position of a rotating element which is mounted in a fixed frame, consisting in using at least one light source emitting a beam of light in the direction of a fixed sensor and using computing means for processing an output signal of the sensor, characterized in that it consists in: - a) arranging the light source with respect to the rotating element and of the sensor in a way so as to induce an interaction between the beam of light and the sensor which depends on the angular position of the rotating shaft, - b) arranging on the path of the beam of light, in a fixed position with respect to the sensor, a perforated mask which presents a repetitive pattern of perforations, - c) detecting shadows generated by the mask on the sensor, - d) processing the output signal of the sensor for determining the position of the shadows on the sensor, - e) and computing the angular position of the rotating element by using the position of the shadows.
摘要:
A method of analyzing a stereo video signal, characterized in that it comprises the steps of extracting from the stereo video signal at least one video frame (10) having two closed regions (10L, 10R), selecting a set of locations (11L, 11R) on each of the two closed regions of the video frame, computing a description (D.11L, D.11R) of the video frame in the neighbourhood (12L, 12R) of each location, associating at least one location (11 L) on the left region (10L) with one location (11 R) on the right region (10R) according to the matching of their respective descriptions, computing the depth (Z.11 L) of at least one location (11 L) on one (11 L) of the regions based on its position (X11L, Y11 L) and the position (X11R, Y11 R) of its associated location (11 R), and transmitting said locations (X11L, Y11 L), depths (Z.11 L) and descriptions (D.11L) though a communication channel (13) to an application electronic device (14).
摘要:
The present invention discloses a method for determining the position and/or the displacement of a mobile element with respect to a fixed frame, consisting in using a fixed light source (1) emitting a beam of light, arranging the light source (1) with respect to the mobile element and with respect to the a sensor (2) in a way so as to induce an interaction between the beam of light and the sensor which depends on the position of the mobile element and using processing and computing means for providing a value of the position and/or the displacement of the mobile element in dependence of the output signal of the sensor, characterized in that it consists in using a concave mirror (3), integral in movement with the mobile element, for reflecting the beam of light in direction to the sensor, arranging on the path of the beam of light a fixed optical mask (4) which presents a two dimensional regular pattern interlaced with an absolute code, detecting and processing the image casted by the optical mask on the sensor, computing the displacement value of the said image on the said sensor and using the computed displacement value for computing and providing the position and/or the displacement in at least one direction of the mobile element in dependence of the image's displacement.
摘要:
The present invention discloses a one-dimension position measurement system comprising: - a first ruler, on which is applied a first one-dimension code, - a second ruler, on which is applied a second one-dimension code, - a camera for acquiring simultaneously a picture of a portion of the first one-dimension code and of a portion of the second one-dimension code, and - some processing means.
According to the invention, the second ruler is disposed parallel to the first ruler, one end of said first ruler being tied to one end of said second ruler, the other end of said first and second rulers being free. Moreover, said first and second rulers are made of material having different temperature expansion coefficients.