Abstract: The elements of the frame, such as A, B, C, and D are held in place by the four angles (1) disposed at the corners of the frame and by the cramps (5, 6, 7, 8) mounted on each angle. On the other hand, each angle comprises a semi-circular flat sheave (1e) surrounding its right-angle apex. The edge of this sheave is provided with a groove (4) in which the cable (3) passes. The tightener (2) comprises a clamp (13) tightened by a screw (16) permitting the two strands of the cable (3) to be clamped between its body and its gripping part. The nut (23) bearing against the end side of the frame (10) acts upon the threaded rod (22) and exerts a pull on the clamp (13) through which the cable is tightened and the elements of the frame are squeezed tight against one another.

Abstract: A fiber optical sensor device is provided for measuring a physical parameter. The sensor device contains a light source which emits a light beam into the end of a first light transmitting fiber. Light delivered from the output end of the fiber is directed to a light dispersing or selecting device such as a prism or an interference filter. This device disperses or splits the light transmitted by the first light transmitting fiber into its spectral components. The sensor device also contains a second light transmitting fiber. The input end of this second fiber receives the spectral components, whereby the components to be transmitted by the second fiber are selected dependent upon the physical parameter to be measured. The output end of the second fiber directs the selected component(s) to a light detector which measures the component intensity. The output signal of the detector is a measure of the physical parameter.

Abstract: A light beam is transmitted by a fiber optical cable to a light modulation device such as a vibrating filament, bar or plate. This device or oscillator modulates the light intensity with a frequency which is dependent upon the physical parameter to be measured. Oscillations are sustained by a striking device. The modulated light beam is transmitted by a fiber optical cable from the measurement location to an evaluation location where the frequency of the modulated light beam is measured. The measured frequency is a function of the physical parameter.