Abstract: A system for simultaneously measuring 3DOF LGEs by a laser and a method therefor, including a measuring unit and a target mirror unit, the measuring unit includes a laser emitting module, a polarizing beam splitter, a fixed reflector, a first photodetector, and an interference length measuring module; the target mirror unit includes a reflector; the laser emitting module generates an emitting light L1, the polarizing beam splitter is used for 1) “beam splitting” comprising splitting the emitting light L1 into a measuring light L11 and a reference light L12, the measuring light L11 is incident on the target mirror unit and is reflected back by the target mirror unit, so as to return to the measuring unit with a 3DOF LGEs signal; and 2) “beam combining” making the measuring light L11 and the reference light L12 superposed with each other at a spatial position, so as to form a combined beam L3; by measuring a position, frequency and phase drifts of the light L3, the 3DOF LGEs of a space object moving linearly al

Abstract: A method and system for simultaneously measuring multiple DOF GEs by a laser. The system comprises a measuring unit and a target mirror unit; the measuring unit comprises a laser emitting module, a polarizing beam splitter, a fixed reflector, a first ?/4 wave plate, a second ?/4 wave plate, a first polarizer, a first photodetector, an interference length measuring module and a 2D angle measuring module. The target mirror unit comprises a beam splitter and a reflector. The laser emitting module generates an emitting light L1. The polarizing beam splitter is used for (1) beam splitting, (2) beam combining, and (3) beam separating. The fixed reflector is used for reflecting backward the reference light L12 propagating only inside the measuring unit to return the reference light L12 to the polarizing beam splitter.

Abstract: The invention relates to an online measurement system and method for multiple parameters of a wheel based on structured light. The measurement system comprises a wheel sensor, a first wheel online measurement device and a second wheel online measurement device, and is characterized in that both the first wheel online measurement device and the second wheel online measurement device comprise a tread structured light unit, a profile structured light unit and a two-dimensional image sensor. The tread structured light unit and the profile structured light unit project a profile contour curve and a tread contour curve on the wheel, the two-dimensional image sensor takes images, three-dimensional reconstruction is performed on the images to obtain tread contour information and profile contour information, and the wheel diameter, the wheel flange height and the wheel flange thickness are acquired according to the obtained contour information.

Abstract: The present invention discloses a laser measurement system and method for measuring a six-degree-of-freedom geometric error of a rotating shaft.

Abstract: The invention relates to an online measurement system and method for multiple parameters of a wheel based on structured light. The measurement system comprises a wheel sensor, a first wheel online measurement device and a second wheel online measurement device, and is characterized in that both the first wheel online measurement device and the second wheel online measurement device comprise a tread structured light unit, a profile structured light unit and a two-dimensional image sensor. The tread structured light unit and the profile structured light unit project a profile contour curve and a tread contour curve on the wheel, the two-dimensional image sensor takes images, three-dimensional reconstruction is performed on the images to obtain tread contour information and profile contour information, and the wheel diameter, the wheel flange height and the wheel flange thickness are acquired according to the obtained contour information.