JP2000055960A - Electric field detector using coherer and decoherer containing spherical metal powder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To embody an electrode structure in which containing metal powder is always brought into contact with both electrodes irrespective of the attitude of a coherer by conducting the coherer as an electric field detector with a uniform resistance value in response to an electric field to be applied with good sensitivity, and easily returning to an original insulating state with a weak acoustic vibration. SOLUTION: Fine metal powder having a completely spherical shape is loosely charged between both electrodes of a coherer 3, the coherer 3 becomes a conducting state in response to an applicable electric field, then the weak acoustic vibration of a small-sized buzzer 8 driven by the stored charge of a capacitor 6 is given to the coherer 3 by using high flowability of the spherical metal powder, and hence effectively returned to the original insulating state. The containing metal powder is always brought into contact with both electrodes even if it is used in any attitude by the coherer 3 having a concentric circular electrode structure, and the electric field detecting capability of high sensitivity can be held.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coherer and a decoherer device containing spherical metal powder. The electric field detecting device according to the present invention can be used for detecting radio waves and alternating electric fields and for detecting electrostatic charging.

[0002]

2. Description of the Related Art A coherer in which a metal powder is loosely packed in a thin glass tube has long been known as a radio wave detector. After the coherer became conductive in response to an external electric field, the coherer was mechanically hit to mechanically return the coherer to its original insulating state. Also, the metal powder contained in the coherer usually had an irregular shape made with a file, so a certain amount of mechanical vibration was required to move the metal powder and make it decohered. Further, since the coherer exhibits a resistance change as an electric resistance of the whole metal powder having an irregular shape, even if a constant external electric field is applied to the coherer, the coherer becomes conductive with a significantly different resistance value each time.

[0003]

Since the coherer of the present invention incorporates a metal powder having a completely spherical shape, the number of contact points between the spherical powders existing between the two electrodes is almost constant. The resistance value of the metal powder as a whole when in the conductive state is almost constant. With this property, a coherer having very stable characteristics can be produced.

Problem 2 to be Solved Since completely spherical metal powder has a very high fluidity, the powder is easily moved and decohered even with a very slight vibration. Therefore, it is not necessary to perform decohering by hitting hard as in the related art, and decohering can occur even with a small buzzer acoustic vibration or several mechanical vibrations of the vibrator to restore the original insulating state.

A decoherer circuit that operates immediately in response to an input voltage to be detected instantly decoheses and cannot be sensed as sound or vibration to know that the decoherer has operated. For this reason, a delay duration of at least about 1 second is required, but this can be solved by decohering using the discharge current of the large-capacity capacitor.

The coherer used in the prior art has an opposing planar electrode structure as shown in FIG. 2, so that when the coherer is placed horizontally, the built-in metal powder contacts both electrodes. If this is set up vertically, metal powder will collect below and will not act as a coherer. By using a coherer having a concentric electrode structure as shown in FIG. 3 to solve this problem, a state can be created in which the metal powder contacts both electrodes with the same area even if the coherer is used upright.

[0004]

An antenna terminal for detecting a radio wave is connected to a coherer. A probe with a built-in high resistance for detecting high voltage electrostatic charging or commercial power supply voltage is connected to the coherer. A spherical metal powder having a particle size of several hundred microns or less is sealed in the coherer tube so that the coherer exhibits a stable resistance value. A high-frequency choke is inserted in order to effectively apply an impact input voltage to only the coherer without passing through the attached circuit. By inserting a light-emitting diode that indicates that the coherer has become conductive in series with the bias power supply, an external voltage is applied to the probe terminal or antenna terminal. Show. Since the capacitor connected in parallel to the circuit is charged by the power supply voltage, when the push switch for decohering is pressed, the charge of the capacitor flows through the buzzer and the buzzer emits a sound. The coherer fixed to the buzzer vibrates slightly due to sound pressure, and the spherical metal powder inside moves to cause decohering. As a result, the light emitting diode goes out and returns to the original voltage detection standby state. If a vibrator that operates at a low DC voltage is connected instead of a buzzer that operates at a low DC voltage, decohering can be performed with only a few vibrations without generating sound.

[0005]

FIG. 1 is a block diagram showing a specific electric circuit of an electric field detecting device according to an embodiment of the present invention.

[0006]

When the probe of the electric field detecting device according to the present invention is brought into contact with a charged object or a commercial power supply terminal, or when the antenna connected to the antenna terminal detects a radio wave arriving from space, the coherer has a sensitivity. It conducts well with a constant resistance value, and as a result, the light emitting diode emits light to indicate that an electric field has been detected. When the push switch is pressed to return the coherer to its original insulated state, the charged capacitor charges the capacitor and activates the buzzer to emit a sound. I do. Since the coherer contains spherical metal powder having high fluidity, even a slight vibration thereof loses electrical contact between the metal powders, and the coherer returns to its original insulating state. In the case where the coherer has the opposed plane electrode structure as shown in FIG. 2, there is a restriction that the coherer cannot be used in a vertical posture. However, by using the concentric electrode structure coherer as shown in FIG. Even when used in such a posture, the present device operates normally and can detect an electric field.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an electric field detection device as one embodiment of the present invention.

FIG. 2 is a side view of a coherer having an opposed flat electrode structure.

FIG. 3 is a side view (left) and a sectional view (right) of a coherer having a concentric electrode structure.

[Explanation of symbols]

1. 1. Terminal for connecting an antenna for radio wave detection 2. A probe for detecting static electricity or commercial power supply voltage with a built-in high resistance to prevent the human body holding this device from receiving an electric shock due to the charged high voltage. 4. Coherer containing spherical metal powder 4.1mH high frequency choke 6. Light emitting diode 6. 1000 μF capacitor 7. Single pole double throw push switch for decoherer drive DC low voltage buzzer 9.3 volt battery 10. Power switch 11. Ground terminal 12. 12. cylindrical insulating pipe Metal electrode 14. Metal electrode 15. Spherical metal powder 16. Cylindrical metal pipe electrode 17. Circular metal rod electrode 18. Insulating plate 19. Insulating plate 20. Spherical metal powder

Claims (3)

[Claims] 1. A coherer containing a perfect spherical metal powder having a diameter of several hundred microns or less as a sensor of an electric field detector. 2. The coherer according to claim 1, utilizing a very high fluidity of the spherical metal powder contained therein, and a weak acoustic vibration through a discharge of a condenser for giving a delay effect is generated by the coherer. A deco-healer device that performs a so-called deco-healing action that returns to the original insulating state. 3. A coherer having an electrode having a contact surface shape such that internal metal powder contacts both electrodes, regardless of the spatial orientation of the coherer according to claim 1.