Abstract:
Improved force measuring apparatus of the one- or two- string type, including means for applying to the movable member of the apparatus a corrective force that compensates for nonlinearities in the response of the apparatus over the full range of travel of the pan carrier member between the no-load and full-load positions, thereby to produce a linear variation in the resulting oscillation frequency with respect to load. In the one-string embodiment, linearization means are provided for applying to the oscillatory string means a corrective force that varies quadratically with the displacement of the movable member over its full range between the no-load and full-load positions. In the two-string embodiment, decoupling spring means are provided for independently connecting the two strings in opposite senses between the frame and pan carrier members. The aforementioned linearization means and/or temperature compensation means are also provided for improving the operation of the two-string embodiment.
Abstract:
A LOAD TO BE MEASURED TENDS TO DEFLECT, CRUSH OR WARP A RING TYPE OF TRANSDUCER. HOWEVER, A SENSOR DETECTS THE SLIGHTEST DEFLECTION OR WARPING OF THE RING AND ACTUATES APPARATUS TO RESTORE THE RING SO THAT THE NET RESULT IS SUBSTANTIALLY ZERO DEFLECTION OF THE TRANSDUCER RING. THE FORCE REQUIRED OF THE APPARATUS, TO HOLD THE TRANSDUCER RING OR TO RESTORE THE RING TO ZERO DEFLECTION, IS PROPORTIONAL TO THE FORCE APPLIED TO THE RING. BY MEASURING THIS FORCE, BY A HYDRAULIC PRESSURE GAGE, FOR EXAMPLE, THE MAGNITUDE OF THE LOAD TO BE MEASURED CAN BE ASCERTAINED. IN SIMPLE TERMS, A "HEAVY DUTY" YET VERY SENSITIVE SCALE IS PROVIDED TO INDICATE LIGHT OR HEAVY WEIGHT OR FORCE. NEVERTHELESS, THE SENSING ELEMENT INCURS SUBSTANTIALLY ZERO DEFLECTION. AND, THIS IS TRUE EVEN WHEN COMPARATIVELY LIGHTWEIGHT AND INEXPENSIVE APPARATUS IS USED.
Abstract:
A sensor includes: an electrostatic-capacity-type sensor electrode layer having a plurality of sensing units; a reference electrode layer opposed to one main face of the sensor electrode layer; and a deformable layer disposed between the reference electrode layer and the sensor electrode layer, the deformable layer being to deform elastically due to application of pressure. The deformable layer is recessed between the sensing units or discontinuous between the sensing units. The reference electrode layer has a shaped portion between the sensing units.