Disclosed is a system for shape error in-situ measurement of large-scale torus, which comprises an attitude adjusting part, a rotating part and a measuring part. The attitude adjusting part comprises an attitude adjusting platform, an attitude adjusting platform motor and an adapter panel, wherein the attitude adjusting platform can adjust the rotation angles along z-axis and x-axis, the angle adjusted is controlled by the attitude adjusting platform motor, and the attitude adjusting part is connected with the rotating part through the adapter panel; the rotating part comprises a rotating index plate base and a high-precision rotating index plate which is released from fixation by a lever for rotating, rotated manually for a required angle, and then fixed again by restoring the lever; the measuring part comprises a sensor clamp, sensor holders, contact sensors and associated equipment, wherein the sensor clamp is positioned with the rotating index plate by a mandrel and then fixed by two bolts and nuts; and the sensor clamp has four groups of sensor jacks in total, with at least three jacks in each group, and a sensor holder is installed in each sensor jack and used for fixing each sensor.

A measurement apparatus includes a horizontal plate. The horizontal plate includes a first plate end, a second plate end disposed away from the first plate end in a longitudinal direction, a first plate surface extending between the first plate end and the second plate end, and a second plate surface extending between the first plate end and the second plate end. The second plate surface is disposed away from the first plate surface in a normal direction. A first support member extends from the first plate end longitudinally toward the second plate end and protrudes in a direction normally away from the second plate surface. A second support member extends from the first plate end longitudinally toward the second plate end and protrudes in a direction normally away from the second plate surface. A measurement bar contacts the first support member and the second support member.

A measurement device can include a plurality of wheel support modules. Each of the wheel support modules can be configured to attach to a different type of vehicle wheel and to provide for rotation of the vehicle wheel about an axis. An arm can be removably attached to the first wheel support module. A measurement element that measures deformation of the vehicle wheel can be moveably attached to the arm. The different configuration of each of the wheel support modules allows for various types of vehicle wheels to be measured for deformation using the same measurement device.

A large-size synthetic quartz glass substrate has a diagonal length of at least 1,000 mm. Provided that an effective range is defined on the substrate surface, and the effective range is partitioned into a plurality of evaluation regions such that the evaluation regions partly overlap each other, a flatness in each evaluation region is up to 3 m. From the quartz glass substrate having a high flatness and a minimal local gradient within the substrate surface, a large-size photomask is prepared.

A large-size synthetic quartz glass substrate has a diagonal length of at least 1,000 mm. Provided that an effective range is defined on the substrate surface, and the effective range is partitioned into a plurality of evaluation regions such that the evaluation regions partly overlap each other, a flatness in each evaluation region is up to 3 m. From the quartz glass substrate having a high flatness and a minimal local gradient within the substrate surface, a large-size photomask is prepared.

The present invention discloses a method for channel decoupling of a whole-roller flatness meter for a cold-rolled strip. The method includes the following steps: 1, setting a channel number and a channel breadth of the flatness meter; 2, obtaining an influence matrix under the condition of coupled channels; 3, calculating an inverse matrix of the influence matrix; 4, decoupling the channel by the inverse matrix of the influence matrix; and 5, obtaining flatness distribution after channel decoupling. The present invention decouples the channel of the whole-roller flatness meter by inverting the influence matrix and multiplying with the detection force vector. The present invention reproduces the true force vector and flatness distribution, and provides a new method for improving the flatness detection accuracy.

A profiling machine includes an inclinometer and a displacement sensor. The inclinometer is configured to sense an incline of the profiling machine on a surface relative to the acceleration vector of gravity. The displacement sensor is configured to sense the distance that profiling machine has traversed along the surface. The profiling machine is configured to calculate and generate a surface profile of the surface based on incline data from the inclinometer and displacement data from the displacement sensor.

A system for quickly determining if a hockey skate blade is bent is disclosed. The system is a quick and effective way to determine if a Hockey Skate Blade is bent which will affect the ability for the blade to be sharpened and skating performance. The disclosed system is a simple way to ensure skating performance and blade sharpness are optimized.

Method for analyzing surface waviness of tooth flanks of a gearwheel, comprising measuring two or more teeth of the gearwheel, wherein a deviation of their tooth flank geometry from the setpoint geometry is measured along at least one measuring path on each of the teeth; measuring at least one further tooth, wherein a deviation of its tooth flank geometry from the setpoint geometry is measured along at least one partial measuring path whose length is less than the length of the measuring path; and/or measuring at least one further tooth, wherein a deviation of the tooth flank geometry from the setpoint geometry is measured by touching at least one point on the tooth flank; associating a rotational angle with each measured value and determining a geometrically captured order spectrum by order analysis of the deviations plotted over the rotational angle, wherein one or more compensation and/or interpolation functions are determined.

A flatness sensing device includes a pressure sensing unit and a controller. The pressure sensing unit includes a plate portion, and a pressure sensor fixed and exposed at an edge of the plate portion. A sensing surface of the pressure sensor is flush with the bottom surface of the plate portion. The pressure sensor senses a pressure or lack of pressure of an object to be tested when it touches the object to be tested. The controller receives the pressure value output from the pressure sensor and determines a flatness of the object to be tested, the controller can issue an alarm on finding non-flatness and cause the degree of flatness to be displayed to a user.