Abstract: The improved intruder detection system of the present invention, because of its sensor, optical, and electronic systems, is uniquely capable of responding only to radiation from an intruder to signal an alarm. To achieve this, the sensor and optical systems are designed and cooperate to optically reject and balance-out extraneous, nonintruder-related radiation. In addition, the electronic system detects and rejects nonintruder-related inputs by recognizing certain uniquely intruder-related characteristics of the sensor signals, and to only signal an alarm in response to inputs evidencing such characteristics. Preferably the system is designed to reliably sense the presence of an intruder in multiple zones, to be economical to manufacture, easy to install, to be battery-powered and of a long life.

Abstract: A system for monitoring the temperature of a plurality of bearings and motors, for example in a grain elevator, includes a plurality of sensors associated with the respective bearings and motors whose temperatures are to be monitored. A first circuit energizes a display for providing a readout of the temperature at each sensor location, and a second circuit compares the temperature at each sensor with a maximum desired temperature for its associated bearing or motor, and energizes an alarm when this desired maximum is exceeded. A third circuit drives a display indentifying the sensor being monitored by the first and second circuits. A malfunction detector circuit produces an observable indication in response to an open circuit condition at any of the sensors.

Abstract: An intrusion alarm comprised of a retractible cord having a releasable member attached to one end of the cord. The releasable member can be held at one side of an entry way such as a door way, holding the cord extended. A retractor mounted at the other side of the entry way so as to retract the cord when the releasable member is released, such as by the opening of a door. The alarm includes a power source and a signal, these being operatively connected to sound an alarm when the releasable member is released. The releasable member may be such as a magnet, and it can also be used as a switch to connect the power supply to the signal.

Abstract: A passive infrared detection system which exhibits a consistent optical aperture and sensitivity over different operating ranges. The system includes a mirror assembly having a plurality of spherical segments arranged in two or more ranks, each corresponding to a different operating range. Each mirror segment is disposed at its respective focal length from a detector, and is of a size and configuration to provide an intended optical aperture to achieve uniform detection sensitivity irrespective of the range of the target.

Abstract: There is provided an alarm, which includes a mounting base, and means for securing the mounting base to an item whose movement is to be signalled by the alarm. A magnetic reed switch constitutes a first element, and a magnet constitutes a second element. One of these elements is mounted on a pivotal member capable of pivoting with respect to the mounting base, while the other of the elements is capable of retaining a given position with respect to the mounting base.

Abstract: A battery powered device which can continuously monitor and detect nuclear radiation utilizing fully integrated circuitry and which is provided with an alarm which alerts persons when the radiation level exceeds a predetermined threshold.

Abstract: Unoccupied passenger seats in a vehicle are sensed and a totalizing recorder such as an odometer is controlled in response to this sensing to provide an indication of the extent of vehicle use which is weighted according to the degree of occupancy of the vehicle. An external signal may be used to indicate whether a desired degree of occupancy is achieved.

Abstract: A liquid activatable alarm device for providing continuous monitoring of the presence or absence of a patient in a hospital bed. When the patient attempts to leave the bed, a pressure sensitive switch responds sounding an alarm warning the hospital staff.

Abstract: A magnetic pick-up device or other electrical output type sensor is operatively situated adjacent to a rotary part of the cable hoist assembly and produces impulses as the part rotates. These are conveyed to electronic equipment which, by use of the necessary calculator networks and the like, displays information such as upper and lower limits or positions of the cable hook and may include automatic cut-off devices for the hoist equipment. Also available is a display showing the total distance travelled by the cable both upwardly and downwardly and means to indicate when a predetermined distance has been travelled. Electronic equipment can also indicate the distance the load travels so that the operator can determine the location of the load relative to a reference point. Furthermore, the rate of travel of the cable as it applies to the penetration of a drill bit can be indicated.

Abstract: A warning apparatus comprises a Gunn oscillator, a transmitting antenna, a receiving antenna, a detector, and a comparator which produces a detecting signal when the output signal from the detector is belowed a reference level. The warning apparatus further comprises a drive circuit for applying a rectangular pulse voltage to the Gunn oscillator, a band-pass filter allowing only a microwave with the transmitting frequency band of microwaves received by the receiving antenna to pass therethrough, and a signal generator for applying the reference signal, which changes in accordance with the output signal of the detector, to the comparator.

Abstract: An electrical translation circuit for detecting the initiation and termination of a turn or change in direction of a motorcycle, automobile, boat or other like vehicle and the cancellation of the turn indicator for that vehicle. Sensors detect relative steering angle, distance and velocity of the vehicle processing same to cancel a manually operated turn indicator. The detected change in steering angle is coupled with processed signals indicative of appropriate forward movement of the vehicle. The combined signals initiate a cancellation signal which will terminate the vehicle turn indicator signal. The vehicle turn indicator signal will not be reset until there has been an appropriate retracement of the steering angle coupled with appropriate forward movement of the vehicle thereby precluding inadvertent reset signals arising from lane changes or vehicle stoppage during the turning operation.

Abstract: An indicator is provided in a dynamoelectric machine such as a DC electric motor wherein brushes are provided in brush holders to cooperate with a rotatable electrical conductor in the machine, for example, slip rings or a commutator. The indicator gives an indication when a brush has worn to a point where it should be replaced, and then an alarm sounds or a light is illuminated. The brush wear indicator includes an indicator contact which is electrically connected to the indicator means and it is insulated from but mounted to move in accordance with the brush wear movement. The contact is provided on the end of an electrical conductor which is embedded in the rear axial end of the brush so that the indicator contact will become exposed and the insulation covering it will be worn away upon sufficient brush wear. This completes an electrical circuit between the indicator contact and the commutator to thus provide an indication at the indicator means.

Abstract: A seed planter monitor is used with a traveling seed planter operable to periodically dispense seeds in each of a plurality of rows. The monitor, preferably a microcomputer device, comprises individual row counters for counting the seeds planted in each row. The monitor determines the row having the highest deviation from the average number of seeds planted per row. Whenever the maximum deviation exceeds a predetermined limit, an alarm signals an error condition to the planter operator. The monitor also senses and warns the operator of any stoppage occurring in any of the rows within a relatively short stoppage distance. Planting data is displayed to the operator during planting.

Abstract: In a flame-detecting apparatus for developing an electrical signal responsive to light, impinging on a light-responsive surface from a predetermined flame area, for example, in a combustion chamber, a convex lens member is disposed at a distance from the surface longer than the focal length of the lens member such that light impinging substantially perpendicularly to the lens member is converged then slightly diverged onto the light-receiving surface. An aperture-defining member is positioned approximately at a focal point of the lens member between the lens member and the light-receiving surface for only giving a light passage around a light axis of the lens member, the cross-sectional area of the light passage being smaller than that of the light-receiving surface so that extraneous light impinging obliquely on the lens member is prevented from passing to the light-receiving surface.

Abstract: The system for detecting abnormalities in the inflation level of a tire of a vehicle includes a coil of metallic wire supported by the wheel and contactor including a switch means responsive to tire pressure for coupling and uncoupling the coil of metallic wire in response to changes in tire pressure. A detector is provided for detecting metallic masses, and this detector is supported on the ground in a position to enable passage of the vehicle wheel closely adjacent thereto.

Abstract: An electronic system is provided for use with motor vehicles, homes, offices, factories, or other applications where it is desired to control access and/or operation. The security system utilizes a coded electronic key, preferably in the form of a card, which is connected to a decoder for identification by composing the key code with a stored code. If the electronic key is properly matched to the decoder, the system is allowed to function without tripping alarms. The system includes monitoring devices, supervising cabling and various access points, such as doors, hoods, etc., which, if breached without the proper card in place, will trip an alarm. The system is deactivated with the proper key and the system includes appropriate delays to allow proper parties to move in and out of the secured vehicle, room, etc.

Abstract: An electronic detection system for detecting intruders employs a transmisn line as a sensing element. In one embodiment the transmission line is a modified surface-wave transmission line, for example, a Goubau line, which is positioned about the perimeter of the area to be protected. An intruder in the field of the line causes an RF reflection back toward the source, which reflection may be detected by Doppler range-gating techniques. In other embodiments of the invention, the transmission line is an insulated, twisted wire pair or a deformable transmission line. In some instances, the transmission line may be replaced with an active or passive pressure line.

Abstract: The invention provides a fire detection system which comprises an electric thermal transducer such as a thermistor placed in a turbulent gas stream. The transducer produces a signal, having an AC and a DC component, which signal is preferably amplified. The components are separated out in a discriminator, for instance an AC amplifier and the AC component is squared and integrated to give a final output which is proportional to the temperature of a heat source, such as a fire, upstream of the transducer. The invention also provides a fire detection system comprising a series of transducers connected to a single processing apparatus, the signal from the transducers being compared to locate a heat source. The invention also provides a method of detecting a fire using a system as described above.

Abstract: An intrusion detection apparatus including a sensor for sensing an objectionable interference phenomenon within a detection area and developing a pulse train coincident therewith, signal processing circuitry responsive to the pulse train and operation to actuate a Gunn diode microwave generator or the like in a pulsed manner causing it to transmit microwave energy into the detection area in synchronism with the interference phenomenon, a microwave receiver for detecting microwave energy reflected from the detection area and for developing detection signals indicating motion within the monitored area, and further signal processing circuitry responsive to the detection signal and operative to actuate an alarm or the like.

Abstract: A multiple zone intrusion detection system in which a plurality of intrusion sensors can be readily converted into the system without system modification, and in which mode control signals from a central control unit and alarm signals from the sensors are both conveyed on a single conductor of the system cable. Each sensor has an associated interface module which permits coupling of different types of sensors to the system and sharing of a single conductor for mode control signals and alarm signals.