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INVENTION
Russian Federation Patent RU2115143
METAL DETECTOR
Name of applicant: Leonard E. Lepine
Name of the inventor: Leonard E. Lepine
The name of the patentee: Leonard E. Lepine
Address for correspondence:
Starting date of the patent: 1997.04.02
Usage: in detecting conductive and ferromagnetic objects by means of induction coils producing an alternating magnetic field to simplify the circuit information processing and provide effective inertialess indication not limited outside of the scale, the sensitivity adjustment facilities in a wide range and ability to work in the dark under water.
The inventive detector comprises a support and a tunable oscillators, a mixer and a display device, the latter is made in the form of a chain of n light-emitting diodes arranged in a ring or line, creating the effect of "running lights", and further comprises a counter-decoder with n outputs, to which attached LEDs delay element divider n, trigger an element of light ban, the output of the tunable oscillator is further connected to the counting input c of the counter-decoder and a divider by n, the output of the mixer is connected to an input of a delay element and an input S trigger installation element output a delay coupled to the reset input of divider R n, whose output is connected to the reset R input of the flip-flop, a direct output Q is connected to the reset input R-decoder and counter with a light entrance prohibition element whose output is connected to the common wire of LEDs, and inverted output 
a trigger input connected to the EU ban of the counter-decoder accounts.
DESCRIPTION OF THE INVENTION
The invention relates to the detection of conductive and ferromagnetic objects by means of induction coils producing an alternating magnetic field.
Known metal containing tunable and reference generators connected in series switch, the first pulse counter, the first memory unit, the correction element, a digital to analog converter, the indicator, the second memory unit, whose output is connected to the control input of the correction element, and a second pulse counter whose input is connected to the output of the reference oscillator, and an output coupled to the control inputs of the first storage unit and the switch, the input of which is connected to the tunable oscillator. To improve the measurement of productivity by automating the process of reading the correction indicator is equipped with a metal detector and decoder to third pulse counter.
There are metal detectors and the other containing the reference and tunable oscillators, frequency comparison circuit, turnouts and audible indicators - headphones.
General block diagram of such analogs is shown below. Increased sensitivity to them is achieved by comparing the reference frequency with higher harmonic frequency of the oscillator.
The disadvantages of the known metal detectors are sensitive restriction caused by listening signals; inconvenience for divers at work under water; unwanted sound to attract the attention of people; disadvantage when working with headphones because a plurality of wires.
The closest to the claimed technical solution is a metal (SU, N 1327033, 1987 - the prototype).
The detector comprises a support and a tunable generators, control circuit and LED. To increase productivity and simplify the metal introduced in series connected switch, the first pulse counter, the first memory device and the correction circuit DAC, a second pulse counter, and the second storage device. The output digital to analog converter coupled to the micrometer dial.
When a conductive object acts detector zone change occurs tunable oscillator frequency, as a result of multiple transformation and memorizing correction leads to a corresponding digital information originating from digital to analog converter, and further - to a deviation indicator arrow.
The disadvantage of this known technical solution is the complexity of transformations, the need for periodic adjustment Keypad and dial gauge, and inertia.
Object of the invention is to simplify the data processing circuits, providing effective display inertialess not limited outside of the scale, ease of adjusting the sensitivity in a broad range, the ability to work under water in the dark.
This object is achieved in that a metal detector comprising a support and a tunable oscillators, a mixer and a display device, the latter is made in the form of a chain of n light-emitting diodes arranged in a ring or line, creating the effect of "running lights", and further comprises a counter-decoder with n outputs, which are connected LEDs, a delay element, divide by n, the trigger and the element of light of the ban, the output of the tunable oscillator is further connected to counter input C-decoder counter and a divider on n, the output of the mixer is connected to the input of the delay and the input of the installation member S flip-flop, the output delay element coupled to the reset input R divider by n, the output of which is connected to the reset input R flip-flop, a direct output Q of which is connected to the reset input R-decoder counter and to the input light barring element whose output is connected to the common wire of LEDs and inverted output a trigger connected to the input prohibition account EC-decoder counter.
In general, due to the combination of distinctive features is achieved by providing a metal detector to simplify information processing circuit, to ensure effective inertialess indication, not a limited range of the scale, convenient adjustment of sensitivity over a wide range, ease of use in the dark under the water. The magnitude of the movement "running lights" (angle, number of turns, etc.) is proportional to the change in frequency of the oscillator and allows visually judge the distance to the subject of the search, but also its size and direction of movement of the opposite view of the frequency response for non-ferrous (eddy current ) and black (magnetic) metals allows to distinguish between ferrous and nonferrous metals.
The combination of sound indication of the proposed light allows you to search conductive and ferromagnetic objects more quickly and easily.
In more detail the proposed technical solution is seen in the flowchart of FIG. 1 and the circuit diagram of FIG. 2.
A block diagram of the detector shown in FIG. 1, consists of the following elements: 1 - a tunable oscillator with a search coil 2 - reference frequency generator, 3 - mixer, 4 - the delay element 5 - divide by n, 6 - trigger 7 - counter-decoder to n outputs, 8 - light element ban (LED off).
The detector works as follows (see. The block diagram in Fig. 1).
In the absence of a metal object in the search magnetic field coil frequency tunable oscillator of the last one is constant, and the output of the mixer 3 there is a constant frequency difference value (or its harmonics). In the interval between pulses of the difference frequency trigger 6 under the action of the more frequent pulses output from the divider 5 is in the reset state R, the counter-decoder 7 - able EC account prohibition light barring element 8 is open, this included any one of the LEDs. When you receive the output of the mixer 3, the next pulse of the difference frequency trigger 6 is thrown into a state of installation of the S, while the circuit reset R,-decoder counter 7 is its reset to "0", on the EC chain - including authorization bill, and the element 8 turns off the LEDs . At the same time starts delay element 4 with a constant time delay greater than the repetition period of the output pulse divider 5, that is greater than the maximum time shift diode-decoder meter 7, after which the element Hold 4 outputs a reset pulse to "0" divider 5, thus carrying out the timing the origin of the beginning of each period of the difference frequency. While the difference frequency is constant, each of its momentum over time coincides with any one and the same impulse in the sequence of n pulse counting counter-decoder, which produces from the time of reset to "0" before the arrival of the account ban pulse is the same number of switches O that each time leads to the inclusion of the same LED, that is, at the same time "light" in the chain is stationary. When approaching the coil oscillator 1 to a metal object, its frequency, and hence the repetition period of the difference frequency pulses change that leads to a shift in time the moment they enter the interval of n counting pulses, resulting in a number of counter 7 switching from reset to stop change, and accordingly included in turn adjacent LEDs, creating the effect of "running lights".
Schematic diagram of the detector is shown in FIG. 2. It tunable oscillator is implemented on a chip DD1, capacitors C1 and C2 and resistors R1 and R2. The search coil L1 serves as a circuit inductance. Reference is made to the generator chip DD2, a quartz resonator ZQ1 and resistor R3. The mixer is made on the D-trigger DD4.1, delay element - the transistor VT1 and elements DD3.2, R5, R6, R12, C4 and C7; divider on the n - on a chip DD5, trigger management - on-chip DD4.2, DD6 - counter-decoder. In the transistor VT2 and resistors R7 and R8 are made of light element ban on elements DD3.1, C3, R4 - generator short reset pulse for DD4 chip and DD6. It outputs counter-decoder DD6 connected chain of indicator LEDs VD1 ... VD10. In addition, the sound indication is stored in the form of a piezoelectric transducer connected to the outputs of the mixer through the buffer elements DD3.3 and DD3.4.
The proposed solution solves the challenge to the invention.
At present, a technical solution is characterized by a set of declared distinguishing features, it is not known in Russia and abroad and meet the requirements of "novelty" criterion.
The proposed solution is the original, greatly simplifying and improving the well-known technical solutions to optimize the design, is not readily apparent from the prior art and meets the requirements of the criterion of "inventive step".
Currently it manufactured and tested several models and is preparing the launch of products in production.
The device - a metal detector - can be realized by industrial methods using known technical means, technologies, materials and components meet the criteria and requirements of "industrial applicability".
CLAIM
Metal containing reference and tunable oscillators, a mixer and a display device, wherein the display device is a chain of n light-emitting diodes arranged in a ring or line, creating the effect of "running lights", and further comprises a counter-decoder with n outputs to which are attached LED lights, the delay element divider n, trigger an element of light ban, the output of the tunable oscillator is further connected to the counting inputs of a counter-decoder and a divider by n, the output of the mixer is connected to an input of a delay element and the input of setup S flip-flop , the output delay element coupled to the reset input R divider by n, the output of which is connected to the reset input R flip-flop, a direct output Q is connected to the reset input R of the counter-decoder and to the input light barring element whose output is connected to the common wire of LEDs, and inverse output a trigger input connected to the EU ban of the counter-decoder accounts.
print version
Publication date 12.11.2006gg
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