Abstract: The present invention relates to an oxygen probe for a furnace. The oxygen probe includes an elongate outer conductor and an inner conductor within the outer conductor. An oxygen sensor is in electrical connection with the outer conductor and the inner conductor. The oxygen probe further includes a seal arrangement for receiving the inner conductor and maintaining a seal to a reference chamber during movement of the conductors owing to heat from the furnace.

Abstract: The present invention relates to an oxygen probe for a furnace. The oxygen probe includes an elongate outer conductor and an inner conductor within the outer conductor. An oxygen sensor is in electrical connection with the outer conductor and the inner conductor. The oxygen probe further includes a seal arrangement for receiving the inner conductor and maintaining a seal to a reference chamber during movement of the conductors owing to heat from the furnace.

Abstract: A system to enable an authorized person access or entry or use of to a restricted area or location or apparatus includes a base station (14) that, on initiation, transmits one or more actuating signals, either at predetermined intervals or on the occurrence of a predefined event The signals are received by any transponder (12) that is within range. Each transponder (26, 27, 28, 29) receiving the actuation signal reacts by transmitting a unique, coded response signal (21, 22, 23, 24) that is received by a receiver associated with the base station (14). A base station processor processes the received response signals (21, 22, 23, 24) and perform a Fourier transform and/or a spectral analysis on the received signal combination to develop an identification of the individual received response signals. The base station selects one of the identified response signals and authenticates the transponder (26, 27, 28, 29) responsible for the transmission of that selected response signal.

Abstract: An access system (2) including an electronic key (4) provided with a transmitter (6) and including a secured location provided with a receiver (10), the transmitter (6) and the receiver (10) being designed to communicate with one another to exchange authentication data. The transmitter (6) transmits a signal; the receiver (10) converts the transmitted signal into spectral data; and, in response to transmission of the authentication data, the access system (2) grants access to the secured location, provided the spectral data matches the spectral signature of transmitter (6).

Abstract: A security system (4, 8), including an electronic key (4) having a transmitter (6) and a secure object having a base station (8) which has a receiver (10) is described, the transmitter (6) and the receiver (10) being designed so that they communicate to exchange authentication data, the key (4) transmitting the data in a message which includes parts having predetermined periods (T0, . . . , T4) having transmission signal variations; and the base station (8) detecting distortion in the transmission signal variations due to a relay station.

Abstract: A device for data transmission in a motor vehicle and/or from a motor vehicle in its vicinity includes a first transceiver unit in or on the motor vehicle and a second transceiver unit. which is provided in at least one transponder unit whose spatial position relative to the vehicle may be variable or any desired position. In the first transceiver unit is a radar unit equipped for distance measurement, expanded by adding a two-channel data transmission system. The second transceiver unit is also a two-channel data transmission unit, and the microwave frequencies for two-channel communication of the data transmission system are selected so that their difference yields an intermediate frequency which is processable using conventional components in a heterodyne receiver in the reception part of each of the first and second transceiver units.

Abstract: A device for data transmission in a motor vehicle and/or from a motor vehicle in its vicinity has a first transceiver unit (1) in or on the motor vehicle and a second transceiver unit (2) which is provided in at least one transponder unit whose spatial position relative to the vehicle may be variable or any desired position; it is characterized in that the first transceiver unit (1) is a radar unit equipped for distance measurement, expanded by adding a two-channel data transmission system; the second transceiver unit (2) is also a two-channel data transmission unit, and the microwave frequencies (f1, f2) for two-channel communication of the data transmission system are selected so that their difference |f1-f2| yields an intermediate frequency (fIF) which is processable using conventional components in a heterodyne receiver in the reception part of each of the first and second transceiver units (1, 2).