An example first device includes: processor circuitry configured to establish a cable communication; analog to digital converter circuitry configured to sample cable voltages over time; echo estimator circuitry configured to determine a plurality of echo coefficients corresponding to the plurality of voltages; and physical length estimator circuitry configured to: identify a first echo coefficient in the echo coefficients that satisfies a static threshold, the first echo coefficient corresponding to a near end echo; identify a second echo coefficient in the echo coefficients that satisfies a dynamic threshold, the second echo coefficient corresponding to a far end echo; and estimate the length of a cable for the cable communication based on the first echo coefficient and the second echo coefficient.

A rollable display panel and a rollable display device, the rollable display panel including a display region configured to display an image; a non-display region surrounding the display region; and a resistor sensor in the non-display region including sensing material of which resistance values are different by location, wherein the resistor sensor outputs a sensing signal that is regularly changed proportional to a rolling length of the rollable display panel, and a sensor driver that determines a driving region of the rollable display panel based on the sensing signal.

Systems are provided for cable length measurement in a communication system. The systems include a transmitter, a receiver, a signal sampler and a cable length calculation unit. The transmitter is configured to transmit a plurality of data symbols at a first data rate via a wired data communication link, and the receiver is configured to receive a reflection signal. The signal sampler is configured to sample the received reflection signal using a phase shift number of shifting sampling phases to generate reflection samples, and combine the reflection samples with different sampling phases to generate a series of reflection samples corresponding to a second data rate higher than the first data rate. The cable length calculation unit is configured to determine a delay parameter from the series of reflection samples, and generate an estimate of a length of the data communication link.

A system and method for cleaning of heat exchanger tubes including an assembly, an indexer, and a communication device provided with specialized software and programming. The indexer includes orthogonally arranged first and second arms. A trolley and sensors are provided on the indexer arms. One or more lances are provided on the trolley to deliver water jets into the openings. Sensors measure displacement as the trolley is moved relative to the heat exchanger's face plate. An operator controls the system from a distance away using the communication device. During setup, the pattern of the face plate is learned and mapped utilizing information from the sensors as one of the inputs. This information is utilized to help navigate the face plate during a subsequent cleaning operation. A kit for retrofitting existing X-Y indexers is also disclosed.

A method for determining the length of a line involves determining a length of a first electrical line, determining an identifier of the first electrical line, determining a length of a second electrical line, which is intended for installation in an electrical installation assembly, based on the length of the first electrical line and a starting length determined by means of the identifier.

A steering wheel angle sensor is described comprising a first part and a second part, wherein the first part and the second part are moveable relative to each other in rotational direction and the first part comprises at least one first signal generating means (1, 2) generating a sine signal (x.sub.2, x.sub.5) in response to an angular position of the second part and at least one second signal generating means (3, 4) generating a cosine signal (y.sub.2, y.sub.5) in response to the angular position of the second part. Such a steering wheel angle sensor should allow a simple fault detection. To this end fault detecting means (9) are provided, wherein the fault detecting means (9) form a sum of the square of the sine signal (x.sub.2, x.sub.5) and the square of the cosine signal (y.sub.2, y.sub.5) and generates a fault signal, if the sum is not within a predetermined range.

Cable-actuated position sensors are described that employ multiple block and tackle arrangements to measure displacement of a draw wire or flexible cable. The disclosed sensors are relatively small and inexpensive. The disclosed sensors may also be used as part of a servo motor, or in conjunction with gear motors to provide positional information for operation of the gear motor.

A deployable device includes a supporting structure, a deployable structure capable of switching from a configuration wound around a first axis to a configuration deployed according to a second axis substantially at right angles to the first axis, by being deployed by a length defined in a frame of reference of the supporting structure, wherein it further comprises a deployed length control device comprising a sensor and a computer linked to the sensor, a first conductive track electrically linked to the sensor extending on the deployable structure, substantially along the perimeter of the deployable structure, and forming one or more turns of a first coil in the wound configuration, and in that the sensor is configured to measure an electrical parameter from the first electrically conductive track which varies with the deployed length of the deployable structure and the computer is configured to determine the deployed length of the deployable structure.

A sensor system for determining extension or tension in a seat belt of a seat-belt system in which the belt extends from and can be wound up on a retractor. The system has an electrical conductor extending longitudinally along the belt, a retractor for paying out and winding up the belt and the conductor thereon, and n electrode juxtaposed with the retractor. A controller connected to the conductor applies an electrical voltage to the conductor and is also connected to the electrode for detecting the voltage in the conductor.

A rollable display panel and a rollable display device, the rollable display panel including a display region configured to display an image; a non-display region surrounding the display region; and a resistor sensor in the non-display region including sensing material of which resistance values are different by location, wherein the resistor sensor outputs a sensing signal that is regularly changed proportional to a rolling length of the rollable display panel, and a sensor driver that determines a driving region of the rollable display panel based on the sensing signal.