Abstract: A force that causes tensile stress in a thread must be measured, for example in the textile industry, to avoid overstretching of the thread. Thus, small thread tensions must be maintained for many threads moving at high speeds. For this purpose a device for measuring thread tensions up to about 0.1 N (Newton) has a rod type metal component, one end of which forms a mounting member while the other end forms a thread engaging lever arm connected to the mounting member by a flat leaf spring carrying at least one strain gage. The lever arm is, e.g., conically tapering away from the leaf spring and carrying a thread engaging cylinder or extension at its end remote from the leaf spring. The signal provided by the strain gage is proportional to the force. The device forms a thread tension sensor having an eigenfrequency of about 3 kHz for measuring tensile stress on threads travelling at high speeds.

Abstract: A strain gage or a measuring transducer equipped with such a strain gage has, for supporting the measuring grid structure, a backing made of a polyphenylenesulfide film. Such a backing assures a plurality of desirable characteristics simultaneously and equally well for each characteristic.

Abstract: A device for measuring physical values, each as pressure changes, includes a sensor transponder section and an interrogator receiver section for transmitting interrogation signals including a power supply from the interrogator receiver section to the sensor transponder section and for transmitting measured signal values in the opposite direction. The sections can be coupled to each other by inductive coils so that electrical connections are avoided. Thus, the pressure in a rotating automobile tire can be measured, for example. The sensor transponder section includes a computer circuit the input of which receives a reference frequency signal and a measured frequency signal. A reference oscillating signal has a frequency determining element that is not influenced by the pressure to be measured, but only by extraneous, e.g. environmental influences. A measuring oscillating circuit has a frequency determining element that is responsive to the changes in the physical value to be measured.

Abstract: A strain gage transducer or rather a large group of such transducers is balanced by a combination of at least one balancing resistor embedded in an insulating member and connected in a corner of a bridge circuit formed by the strain gages, and a number of adjustment resistors included in a flat, flexible printed circuit type cable having first conductor strips connected at one inner end to said balancing resistor in the embedding insulating member and electrically interconnected at the other output end. The adjustment resistors form part of the flat first conductor strips and are initially short-circuited by respective conductor strip sections which are interrupted for the adjustment.

Abstract: In a mechanical to electrical transducer, a plurality of strain gauges are mounted either on a diaphragm or on a flexure spring mechanically coupled to the diaphragm. The diaphragm is mounted on a clamping ring, and the strain gauges are disposed at different distances from the clamping ring. In order to equalize the heat transfer of the strain gauges with respect to the clamping ring, the areas of the strain gauges may be varied, the spacings of the conductors of the strain gauges may be varied, the relative positioning of the strain gauges may be controlled, the width of various portions of the flexure spring may be varied, or slots may be provided adjacent certain strain gauges in the flexure spring.