7124results about "Testing/calibration of speed/acceleration/shock measurement devices" patented technology

A position measurement apparatus includes a movable stage structure, a measurement unit using a laser to measure a moved position of the stage and to output a corresponding measured value, a first filter configured to attenuate a first component of a certain frequency region of the measured value outputted by the measurement unit, a second filter connected in parallel with the first filter configured to attenuate a second component other than the certain frequency region of the measured value outputted by the measurement unit, a third filter connected in series to the second filter with the series connection of the second and third filters connected in parallel with the first filter, configured to attenuate the first component of the certain frequency region of the measured value outputted by the measurement unit, and a processing unit configured to combine an output of the first filter and an output of the series connection of the second and third filters and to thereby output a first combined value.

A computer-assisted system, medium and method of providing a risk assessment of a target system. The method includes providing one or more test requirements categories, associating one or more first data elements with each requirements category, associating one or more second data elements with a degree of exposure of the target system to the one or more threats, comparing the first data elements to the second data elements to determine, based on predetermined rules, composite data elements for each requirements category; and selecting, based upon predetermined rules, a level of risk of the composite data elements as a baseline risk level for each requirements category.

A method and system detects and diagnoses faults in heating, ventilating and air conditioning (HVAC) equipment. Internal state variables of the HVAC equipment are measured under external driving conditions. Expected internal state variables are predicted for the HVAC equipment operating under the external driving conditions using a locally weighted regression model. Features are determined of the HVAC based on differences between the measured and predicted state variables. The features are classified to determine a condition of the HVAC equipment.

Some embodiments of the invention may operate to measure a first output performance metric value associated with a current operation frequency of a processor, to set a trial operation frequency of the processor, and to measure a second output performance metric value associated with the trial operation frequency. If the measured performance variation is less than a specified acceptable performance variation, the trial operation frequency may be selected as a subsequent determined operation frequency.

Some embodiments of the invention may operate to measure a first output performance metric value associated with a current operation frequency of a processor, to set a trial operation frequency of the processor, and to measure a second output performance metric value associated with the trial operation frequency. If the measured performance variation is less than a specified acceptable performance variation, the trial operation frequency may be selected as a subsequent determined operation frequency.

A method for tracking an object includes producing energy fields at a plurality of different frequencies in a vicinity of the object, and receiving signals that are generated at a location of the object at the different frequencies in response to the energy fields. Multiple computations are made of spatial coordinates of the object based on the signals received at the different frequencies. Convergence of the computations is tested in order to ascertain whether the energy fields have been perturbed by an article in the vicinity of the object.

A system and method for monitoring photovoltaic power generation systems or arrays, both on a local (site) level and from a central location. The system includes panel and string combiner sentries or intelligent devices, in bidirectional communication with a master device on the site to facilitate installation and troubleshooting of faults in the array, including performance monitoring and diagnostic data collection.