Abstract: In the device the base and the swivel members consist of three spaced plates disposed one above the other. That is, a baseplate (1), an intermediate plate (3) and a supporting plate (5). The baseplate (1) is connected to the intermediate plate (3) disposed above it, via a first hinge (2) provided for within the area of one longitudinal side, and this intermediate plate (3), in turn, and within the area of the longitudinal side lying opposite the first hinge (2), is connected to the supporting plate (5) disposed thereabove, via a second hinge (4). Both the intermediate plate (3) and the supporting plate (5) are jointly capable of being swivelled about the swivel axis of the first hinge (2) and the supporting plate alone is capable of being swivelled about the swivel axis of the second hinge (4). The supporting plate (5) contains the object receptacle (8) whose center line is in agreement with the axis of the object.

Abstract: The rotation rate measuring instrument, in which the phase difference caused by the Sagnac effect is evaluated, contains two optical waveguides (7, 17). From a light beam, two component beams (CW, CCW) are derived which traverse the first optical waveguide (7) in opposite directions. A passive beam splitter (16) connects the first optical waveguide with the second optical waveguide (17) and splits each of the component beams into two further component beams. Of these further component beams, one remains in the first optical waveguide, and the other enters the second optical waveguide, where it propagates in the opposite direction. Evaluation, for which the two component beams are combined after having traversed one or both optical waveguides, takes place on a time-division multiplex basis, such that either the traversal of only one optical waveguide (7) or the traversal of both optical waveguides (7, 17) is taken into account. By comparing the two measurements, additional nonreciprocal phase differences (.

Abstract: A semiconductor laser is constructed such that at least a part of the laser optical feedback is provided by an external reflector spaced from the semiconductive material of the laser so as to form a composite optical cavity bounded by the semiconductive material and the reflector. The external reflector is supported on a mount constructed such that in response to changes in temperature the mount moves the external reflector relative to the adjacent surface of the semiconductive material so as to provide the external part of the optical cavity with a thermal coefficient substantially matched with the mode wavelength expansion coefficient of the internal part of the cavity.

Abstract: An infra-red detector or sensor comprises a wafer (11) of single crystal silicon in one surface of which pyramidal pits (12) forming a two-dimensional array are etched. The pits form horn aerial elements whereby radiant energy is directed to bolometers (14) one disposed at the throat of each horn.

Abstract: A pulse corrector provides circuitry for responding to first and second input pulses applied to its first and second inputs to provide first and second output pulses at the first and second outputs respectively such that the first pulse edge occurring at the first output after an interruption of the first input pulses never leads the corresponding first pulse edge occurring at the second output irrespective of the phase relationship between the corresponding first pulse edges occurring at the inputs after the interruption. Circuitry is also provided to ensure that the duration of the pulse produced at the first output and starting with the aforementioned first edge is not substantially less than that of one of the first and second input pulses, thus ensuring that a phase detector connected to the outputs of the pulse corrector is placed in a predetermined neutral state by the aforementioned pulse edges such that both its outputs are activated before reference pulses are again allowed to contact its input.

Abstract: For locating faults in digital telecommunication subscriber terminations various test loops (A, B, C) are closed and checked by signals transmitted via the exchange (16). When a fault is proved to exist in the so-called C-loop, it cannot be detected whether the fault is in the subscriber line (2) or in the network termination (1). In order to be able to distinguish between the two sources of fault, and when the subscriber line (2) is in an unobjectionable state, the filter coefficients which are continuously adjusted in a recursive filter contained in the echo canceller (24) of the subscribers group circuit (17), are stored. Since, in the case of a faulty subscriber line (2), the echo canceller (24), based on the received pulse answer, adjusts changed filter coefficients, it is possible to localize the location of fault by way of comparing the continuous coefficients with the stored coefficients.

Abstract: A demodulator circuit for demodulating a suppressed carrier phase modulated data input signal includes a carrier recovery circuit providing orthogonal reference carrier signals, first and second demodulation circuits for demodulating the signal with the orthogonal reference carrier signals, at least one data estimation circuit for deriving a first data estimation circuit from the demodulated signal, a second demodulated signal being delayed to obtain a signal which in combination with the first data estimation signal controls the carrier recovery circuit. The circuit further includes an automatic gain control which in response to the first data estimation and to a delayed first demodulated signal provides an AGC output signal.