Abstract: Disclosed is an actuator level detection system of an aircraft. The system includes an actuator containing fluid that defines a resistivity and including a first contact point and a second contact point. The system includes a first contactor disposed about the actuator cooperating with the first contact point to define a first contact resistance that includes the resistivity. The system includes sensor circuitry includes a conductive path defining a conductive path resistance, between the first contact point and the second contact point. The sensor circuitry has a total resistance that includes the first contact resistance and the conductive path resistance.
Abstract: A level sensing controller includes a signal generator circuit to generate an excitation signal. The controller also includes a connection to route an inverse of the excitation signal to a first polar electrode of a first capacitor. The first polar electrode is coupled to a container to hold liquid. The controller also includes a connection to route the excitation signal to a second polar electrode of a second capacitor. The second positive polar electrode is coupled to the container. The controller also includes a connection to a sense electrode to form the first capacitor with the first polar electrode and to form the second capacitor with the second polar electrode. The controller also includes a measurement circuit configured to measure charge at sensing electrode and determine, based on the measured charge, whether a liquid in the container has reached a level of the second polar electrode.
Abstract: A projection type image display device provided with an unauthorized use preventing system includes a button unit or a remote controller for operating the display device, a condition memory for storing information indicating at least one use condition in an authorized use of the display device, a password memory for storing a password for releasing a restriction on the use of the display device, a detector for detecting a used condition of the display device at a power on timing, and a processor for imposing restrictions on the use of the display device when the use condition detected by the detector does not match the at least one use condition indicated by the information stored in the condition memory and for relieving the restriction based upon input of the password.
Abstract: Acceleration and/or tilt sensor having a ferromagnetic fluid that is located in a receptacle, and the receptacle constitutes a neutral position for the fluid, and the fluid is permanently magnetized, and a magnetic field detector arrangement is located at the receptacle to detect a displacement of the fluid, wherein a portion of the fluid can be displaced relative to the receptacle from the neutral position to an operating position by an external force while maintaining a continuous surface with the portion of the fluid remaining in the neutral position, and the fluid returns to the neutral position after removal of the external force.
Abstract: An adjustment-free tiltsensor for application in the fields of geodesy, geophysics and geotechnics, with a tilt angle measuring range greater than ±5° to ±10° and an essentially enhanced angular resolution better than 1 microradiant, in which an electrolytic liquid and a gas bubble are present in a closed spirit level, the spirit level is curved over an angle of up to 360°, a plurality of electrode configurations each having a plurality of electrodes are arranged along the spirit level for sensing the position of the gas bubble, the electrodes are in electric contact with the electrolytic liquid, and the electrodes are connected to a first electronic circuit, by means of which the electric quantities between selected electrodes can be measured.
Abstract: An electrolytic tilt sensor is disclosed which comprises a containment envelope having a metallic container and a header, the envelope defining a chamber and having at least one pair of apertures, an electrolytic solution partially filling the chamber, and at least one pair of electrodes, each electrode including an electrically active, transverse portion positioned within the chamber in a general horizontal alignment with one another defining a tilt axis, and a lead portion extending to the exterior of the envelope through the respective aperture. The tilt sensor may further include a sealing material disposed in each aperture of the providing a substantial fluid-tight seal about the respective electrode.
Abstract: A digital inclinometer detects an inclination angle by sensing varying conductive current of various electrodes. When the inclinometer is rotated through an inclination angle, various segments of the sensing electrodes become immersed in a conductive fluid causing varying conductive currents to these sensing electrodes. A driving signal is applied to driving of electrode and the sensing side of electrodes is kept at a constant voltage by connecting them to an analog ground or to current sensing amplifier which maintains virtual ground during measurement to achieve an equipotential at both sides of the sensor plates. An Analog to Digital converter, microprocessor, and LCD display achieves a digital readout. Novel methods allow 360-degree precise measurements, while overcoming traditional limitations and errors due to fringe effects, non-linearity, and various environmental changes.
Abstract: A tilt sensor capable of sensing tilt in two axes includes an outer shell, a magnet at a fixed position inside the shell, and a reference element movable within the shell in response to gravity. Magnetic flux follows a plurality of paths from a pole of the magnet, around the shell, through the reference element, to the opposite pole of the magnet. Magnetic sensors detect changes in reluctance of the flux paths resulting from the movement of the reference element within the shell, from which the angle of tilt can be determined.