摘要:
A system is useful for positioning a load, such as a test head. The system includes an arm which supports the load and which moves along a first vertical axis. The system also includes a rotation unit for rotating the first vertical axis about a second vertical axis spaced apart from the first vertical axis.
摘要:
A sensitive, durable, high resolution tactile sensor particularly suited for use as a robot end effector in an automated manufacturing process. The tactile sensor has an array of pressure sensing sites provided by a series of current emitter electrodes surrounded by a series of companion current collector electrodes both of which engage a rough conductive layer carried on the underside of a resilient platen. The emitters are electrically connected together in parallel rows, and the collectors are electrically connected together in parallel columns above and across the rows. The emitters and collectors are electrically insulated from one another as are the rows and columns. When the platen engages an object to apply pressure at one of the sites, and a positive voltage is applied to an emitter electrode, current flows from the emitter electrode and through the conductive layer to the companion collector electrode from which it is collected and measured. Cross-multiplexing circuitry scans the rows and columns periodically to provide a readout of both the location and magnitude of applied pressure.
摘要:
A system is useful for positioning a load, such as a test head. The system includes an arm which supports the load and which moves along a first vertical axis. The system also includes a rotation unit for rotating the first vertical axis about a second vertical axis spaced apart from the first vertical axis.
摘要:
A safety lock system prevents unlocking of a balanced loaded unit when the loaded unit becomes unbalanced. A plurality of calipers applies pressure on opposite sides of a guide rail. A lock block couples the load to at least one of the calipers for movement of the load along the guide rail. A rotatable handle is coupled to the calipers through a shaft. Rotation of the handle locks or unlocks the lock block against vertical movement. A safety block is coupled to the loaded unit and is moveable with the loaded unit for preventing rotation of the handle upon a preselected movement of the loaded unit relative to the lock block.
摘要:
Tunable optical parametric amplifiers and oscillators that are pumped by the light from a tunable laser source are disclosed. One possible embodiment uses a tunable solid-state laser pump and an OPA medium or nonlinear crystal, such as potassium titanyl phosphate KTP or barium borate BBO or lithium borate LBO. The second harmonic output from a tunable solid-state laser is also used to pump the OPA medium. A singly or doubly resonant cavity design is preferably used to reduce the oscillation threshold (i.e., the required pump beam power) of the OPO.
摘要:
A method is disclosed for producing a superimposed fast transient grating on a permanent holographic grating which provides high scattering ability, fast modulation response times, and the capability of writing and erasing signals therein. A glass host is doped with trivalent rare earth ions, and is then placed in the crossed field of two coherent radiation beams to resonantly pump the trivalent rare earth ions at a frequency in resonance with one of the absorption transitions thereof. This produces two types of laser induced gratings, a transient population grating associated with the excited rare earth ions, and a permanent holographic grating associated with a structural modification of the glass host. The superposition of these gratings result in a four wave mixing signal with enhanced strength and the capability of amplitude or frequency modulation. These superimposed gratings have applications involving phase conjugation and other types of optical signal processing and also provide a new method for probing the local structural properties of amorphous materials.