摘要:
Method and arrangement for oscillation isolation by means of an air bearing. The electropneumatic valves (4) for the compressed-air supply to the air bearing are subjected to a dither signal. This causes additional vibration of the mass 1 to be isolated. A compensation signal transmitter (12) ensures that additional vibration of the mass (1) is suppressed, by controlling actuators (10). Overall, hysteresis effects are avoided in the control of the compressed-air flow.
摘要:
The invention relates to a device for compensating for magnetic fields which has two sensors which are active in different frequency ranges and thus allows regulation with a bandwidth from 0 to 20 kHz.
摘要:
The invention relates to the control and regulation of a vibration isolation system with a number of vibration signal transducers for providing analogue sensor signals and a number of actuators for suppressing vibrations by processing the sensor signals to form actuator actuation signals for driving the actuators. One object of the invention is to demonstrate a way which enables high-quality parameterizability and regulating performance over a considerably wider frequency bandwidth of a vibration isolation system to be regulated. The invention proposes digitizing some of the sensor signals provided and processing them to form digital actuator actuation signals and processing other sensor signals provided in an analogue manner to form analogue actuator actuation signals and combining the digital actuator actuation signals and the analogue actuator actuation signals to form common actuator actuation signals which are supplied to the actuators in order to drive them.
摘要:
The invention is in particular a supporting device for relative supporting loads with respect to a base comprising a load side part, a base side part, and an intermediate part giving support to the load side part, and thus defining a supporting direction with reference to the base and the load side, including a pressure chamber bounded by chamber walls.
摘要:
There is provided a method and an apparatus for isolating mechanical vibrations reacting to beam metrology tools. The apparatus includes an outer structure for supporting a metrology instrument, and a chuck for holding a specimen with respect to the metrology instrument in an intended defined position for performing measurements on the specimen by the metrology instrument,. The apparatus also includes at least one active vibration isolator means coupled to the chuck for compensating relative movement between the specimen and the metrology instrument. A method is also provided that includes detecting a change of position of the specimen in response to mechanical vibrations, and effectuating an active modification of the position of the chuck in response to the detection for counteracting a relative displacement between the specimen and the metrology instrument.
摘要:
An active system for isolating vibrations includes: at least one first vibratio-isolating device, arranged between a load and a sstanding surface, for at least partially decoupling the static and dynamic forces acting between the load and the standing surface, the first vibration-isolating device includes a passively isolating coupling element for mechanically decoupling the static and dynamic forces including a natural frequency; at least one second vibration-isolating device, assigned to the load, for imparting control forces to the load for actively damping the substantially decoupled dynamic forces, the second fibratio-isolating device including a coupling element for dynamically coupling said second vibration-isolating device to the load and the first isolating device
摘要:
The invention relates to an active vibration isolation system which detects structural vibration of the mass to be isolated via a sensor and also takes account of these disturbance variables.
摘要:
An examination and processing machine, in particular a lithography appliance, for use in the semiconductor industry, comprising a machine frame (1), an examination or processing device (5) for a work piece (4), a carriage (3) which is mounted on the machine frame (1) and can hold the work piece (4), a handling device (6) for positioning the work piece (4) on the carriage (3) and for removing it from the carriage (3), a series of oscillation isolators (2) for low-oscillation mounting of the machine frame (1), and individual control devices (30, 40, 20) for controlling the carriage (3), the handling device (6) and the oscillation isolators (2). These control devices (20, 30, 40) are subordinate to an overall control device (50), which acts as a host system, via a real-time bus (60).
摘要:
A vertically and horizontally effective air bearing comprising a base, an interface part that is movably arranged on the base, a piston that is movably arranged inside the interface part and supports a load, and a coupling element that couples the piston with the load. The load is supported in a manner to be isolated from vibration in the horizontal and vertical directions with respect to the base, and the coupling element preferably comprises a pin that is coupled to the piston. The coupling element is spaced from the load by at least one quarter of the length of the piston.
摘要:
The invention relates to a method for adapting a vibration isolation system as well as to an arrangement with a vibration isolation system. By constructive measures in the environment of the vibration isolation system, particularly plane-parallel surfaces areas are avoided and thereby disturbing environmental influences are reduced.