1297 results about "Metal detectors" patented technology

A marker for marking a site within the body of a mammalian patient is positioned within the tissue of a patient. The marker may be placed in the first instance by a needle or the like or placed where a tissue sample has been removed. The marker has a plurality of loops each at various angles to the other such that when positioned within the patient, one of the loops is positioned orthogonal to a magnetic field of a metal detector. Various shapes of markers may be used, including electron orbital shapes, chains of loops or barbells. Barbs or other anchoring elements may be used to stabilize the marker's position. Normal delivery techniques as needles, catheters or cannulas may readily position the marker within the patent. By having the marker so designed and positioned, at least one of the closed loops is detectable by a metal detection beam of a metal detection device.

An integrated metal detector-portable medical device adapted to identify metals in a human body, where the metal detector is in connection with the portable medical device. The metal detector includes: at least one transmitting means adapted to generate a second magnetic field so as to induce a magnetic field generated by a metal; at least one sensor adapted to detect a magnetic field generated by the metals to be detected; and at least one signaling means adapted, upon detection of a magnetic field, to alert the identification of metals, if the intensity of a magnetic field is above a predetermined value.

An implementation of a direction finding and magnetic nulling metal detector is provided. Some embodiments of the present invention provide for a metal detector having multiple resonant circuits and associated coils for transmitting a primary transmit signal, transmitting a magnetic nulling signal, and receiving a receive signal. A controller includes logic to process the generate the transmit signals and to process the received signal in order to determine a gradient vector along one or two dimensions, a depth and whether or not a metal object is ferrous.

The present application discloses a system for scanning a shoe for illegal materials. The system includes an X-ray source for projecting a beam of X-rays onto the shoe, a detector array for detecting X-rays transmitted through the shoe and at least one metal detector coil for detecting metals within the shoe. The system produces a radiographic image of the shoe by processing the detected X-rays and data obtained from the at least one metal detector coil. Other embodiments are directed toward other screening technologies, including millimeter wave screening technologies.

A metal detector has a circular excitation coil (10) through which foodstuffs to be tested (65) pass, on a conveyor belt (40). The excitation coil (10) is excited by a stable oscillator (50) and the lines of flux generated by the excitation coil (10) link two receiver coils (20, 30) equidistantly spaced either side of the excitation coil (10). As a foodstuff (65) having a foreign ferromagnetic or electrically conductive object therein passes through the receiver coils (20, 30), a voltage is induced in them. This induced voltage is phase compensated. The change in amplitude or frequency of the oscillator (50) as the foodstuff (65) moves through the excitation coil (10) is also passed to the processor (70) which removes the artifacts from the detector signal caused by the volume of the foodstuff (65) itself. The resultant signal, which was previously swamped by the effect of the volume of the foodstuff itself, can then be detected and the foodstuff can be removed from the conveyor (40).

An electronic ferrous metal detector with an alarm includes a non-ferrous core positioned circumferentially about an opening in an object, such as a hole in a garbage can lid. A pick-up coil having a sufficient number of windings is wound about the non-ferrous core for detecting magnetized objects passing therethrough and generating a voltage. The voltage is passed through an op-amp and into a comparator/detector, where a preset reference point is compared to the voltage from the op-amp. Once the voltage passes the preset reference point, the comparator goes to a high output and powers a switch, such as a SCR or Triac, which is gated on and carries the current and feeds the voltage to an alarm that provides an audible or visual signal that a magnetized piece of ferrous material has passed through the metal detector.

A hybrid-technology metal detector, using pulse-induction and sine-wave excitation of the transmitter coil alternately, in rapid succession. The energy stored in the transmitter coil, in the pulsed mode, is used to shock-excite a high-Q circuit formed by the coil and a parallel capacitor into oscillations in the sine-wave mode. The multiplicative action of the circuit Q causes high currents to flow in the transmitter coil, causing high fluxes to be impressed on the searched area, with increased sensitivity as a result. Using a linear coil-current ramp to assess and minimize the coupling between the transmitter and receiver coils permits effective separation of the reactive and resistive components of the target signals, making accurate identification of targets possible.

This invention relates to a metal detector using multiple frequency signals generated and processed digitally. The detector transmits sinusoidal signals using a multiple frequency resonator or square waves, with optional modulation. The operation of the transmitter is continuously monitored to allow for tuning, detection of abnormal conditions and correction of phase shifts.

An integrated medical waste management and treatment system may include sensors, interlocks, communications links and/or other features for determining if the waste itself, the decontaminating disinfectant used in the process, or the status of the system are consistent with recommended or authorized system operation. System operation may be terminated if a condition inconsistent with recommended or authorized system operation is detected. Such compliance apparatus may include an electronic scale for determining the weight of the waste loaded into the receiver compartment, a metal detector, or a sensor for determining if the decontaminating disinfectant is a recommended or authorized disinfectant. A communications link may be provided one or more systems to transmit information to a central station to deliver updates or commands associated with the recommended or authorized operation of each system.

A spectral analysis surveillance system includes sources or emitters which emit various wavelengths of electromagnetic radiation or energy into a space under surveillance, and a sensor which produce signals indicative of electromagnetic energy returned by people and other objects in the space. The electromagnetic radiation may fall in the visible portion of the electromagnetic spectrum yet the energy is emitted to appear as either white light or a single color. Returned energy is analyzed against reference samples. The spectral analysis surveillance system may be part of an integrated surveillance system including other components, for example metal detectors, baggage X-ray scanners, full body imagers, etc., and may provide surveillance of private or public locations, for instance airports.

The invention relates to a continuous casting-direct rolling device for producing a rod wire and a section bar. The device comprises a continuous casting machine, a casting blank cutting device, a after-cutting roller way, a quick heat-insulating roller way and a steel rolling production line, wherein the continuous casting machine is arranged as a one-machine one-flow or multi-machine multi-flow continuous casting machine; the roller way width of the quick heat-insulating roller way is gradually reduced along the direction from the continuous casting machine to the steel rolling production line till a single casting blank can pass; a plurality of hot metal detectors, a pyrometer and a heat-insulating device are arranged on the quick heat-insulating roller way; the device further comprises a casting blank unloading device; the casting blank unloading device can be selectively arranged in front of the quick heat-insulating roller way or the steel rolling production line. The invention further provides a continuous casting-direct rolling method for producing the rod wire and the section bar. According to the invention, a traditional heating furnace is cancelled and the metallurgy thermal energy of a continuous casting blank is fully utilized, so that the energy consumption and the discharging in the production of the rod wire and the section bar are greatly reduced; the technological process is simplified, the equipment investment of a heating furnace area is reduced, and the cost is lowered; the oxidation burning loss of the billet is reduced and the yield is increased.

The present invention is directed to an apparatus for providing law enforcement and private citizens with a single device that integrates law enforcement tools and mechanisms for the application of force. An exemplary device features a metal detector, a light emitting source optionally having a strobe feature, an electric stun system, and a debilitating spray dispensing system. Some embodiments of the present invention include an electric stun system comprising a plurality of probes mounted to the distal terminus of the shaft and configured to protrude from the shaft, a plurality of plates configured longitudinally along the outer surface of the shaft, and a stun system switch disposed on the shaft. Some embodiments of the present invention include the debilitating spray dispensing system comprising at least one nozzle and a dispensing switch disposed on the handle. Some embodiments of the present invention include a handle comprising an ergonomic grip and a guard.

It is a metal probe in lossless electromagnetism measurement technique field. The digital signal processor generates two paths of signals through two direct digital systemization chips into two multipliers that get two paths of separation signals through two low-pass filters. The data through the A/D conversion is sent to the digital signal processor for analysis and judgments. The human and machine dialogue system comprises single machines communicated with digital signal serial processors.

The invention relates to the manufacturing field of cigarettes, in particular to a method for manufacturing cigarettes by the filamentization of tobaccos reconstituted by a papermaking process. The method comprises the following steps of: (1) scattering boxed finished reconstituted tobaccos, and storing the scattered reconstituted tobaccos in a bin cabinet; (2) lifting the reconstituted tobaccos in the bin cabinet, and controlling the flow of the reconstituted tobaccos by using an electronic belt scale; (3) conveying the reconstituted tobaccos to a reversible belt by a high-position vibrationgroove with a metal detector; (4) after the reconstituted tobaccos on the reversible belt falls off the conveying vibration groove, prepressing the reconstituted tobaccos by a prepressing device, andallowing the reconstituted tobaccos to enter a tobacco filament cutter; (5) winnowing the reconstituted tobaccos to remove dust, allowing the reconstituted tobaccos to enter a buffering cabinet, and metering and boxing for blending; and (6) mixing the boxed reconstituted tobaccos and cut tobaccos directly by a blending filament mixing system, perfuming, storing and rolling to form the cigarettes of finished products. The reconstituted tobaccos are blended directly without undergoing a high-strength processing process, so resource waste caused by mechanical crushing in the process of blending the reconstituted tobaccos is reduced.

The present invention discloses a small-cross tapping control method of continuous cast billet heating furnace, and is characterized by that at charging side of two heating furnaces a furnace-charging sensor, slab length detection disk and slab furnace-charging temp. detector are mounted, in the interior of the furnace a detector is mounted and at tapping hole a heat metal detector is mounted. The slab length signal, billet furnace-charging temp. signal and slab pulling speed signal are transferred into PLC and process control computer, and the computer can be used for making operation and comparison so as to obtain the optimized tapping modulus of two furnaces and can implement slab small-cross tapping control of two heating furnaces.

The invention relates to a method for controlling automatic equidistant steel tapping of a heating furnace, comprising the following steps of: setting steel tapping intervals; obtaining the time that billet is conveyed to the outlet of a heat insulating roller bed according to the distance from the head of the billet in the heating furnace to a hot metal detector at the outlet of the heat insulating roller bed and the speed of the roller bed; calculating the line speed of the billet in a 0# rolling mill; calculating the time that the tail of the billet is separated from the hot metal detector at the outlet of the heat insulating roller bed and enters the 0# rolling mill; calculating the time S3 when the furnace door of the heating furnace is opened; comparing the speed of the billet in the rolling in actual production with the linear speed of the billet in the 0# rolling mill, wherein if the difference is smaller than or equal to 10% of the linear speed of the billet in the 0# rolling mill, S3 is used as the time that the furnace door is opened, and if the difference is greater than 10% of the linear speed of the billet in the 0# rolling mill, the time S3of opening the furnace door calculated previously is retained. The invention can avoid repeat steel heaping and reduce delay of machine halt, thereby the dimensional accuracy of the product is improved, and the hour yield of roll line production is improved greatly.

A method of operation of a metal detector having a driver circuit for establishing an alternating magnetic field in a coil system so as to generate an output signal at a given frequency, the method comprising the steps of

• • a. generating an adjustable balance signal;
  • b. combining the adjustable balance signal with the output signal of the detector.
  • c. varying the adjustable balance signal so as to provide a compensated signal.