To generate ultrasound, specialemitters of magnetostrictive type. The main parameters of the devices include resistance and conductivity. The allowable frequency is also taken into account. By design, the devices may vary. Also it should be noted that the models are actively used in echo sounders. To understand the emitters, it is important to consider their scheme.
Device Diagram
Standard magnetostrictive radiatorThe ultrasound consists of a stand and a set of terminals. Directly the magnet is fed to the capacitor. There is a winding at the top of the device. A clamping ring is often installed at the base of the radiators. The magnet is suitable only for the neodymium type. At the top of the models is a rod. To fix it, use a ring.
Ring modification
Ring devices operate at conductivity from4 microns. Many models are made with short stands. Also it should be noted that there are modifications on field capacitors. To collect the magnetostrictive radiator with your own hands, the coil of the solenoid is used. In this case, it is important to establish a low threshold voltage. A ferrite rod is more suitable for choosing a small diameter. The clamping ring is put in the last turn.
Device with a yarn
Make the magnetostrictive emitter yourhands quite simply. First, the rack is prepared for the rod. Further it is important to cut out the stand. To do this, you can use a metal disk. Experts say that the stand in diameter should not be more than 3.5 cm. The terminals for the device are selected at 20 V. At the top of the model a ring is fixed. If necessary, you can rewind the electrical tape. The resistance index of the radiators of this type is in the region of 30 Ohm. They work with a conductivity of at least 5 microns. Winding in this case is not required.
Dual winding model
Devices with a double winding are produceddifferent diameters. Conductivity in the models is at the level of 4 microns. Most devices have high impedance. To make a magnetostrictive radiator with your own hands, only a steel stand is used. The isolator in this case is not required. The ferrite rod can be mounted on the lining. Specialists recommend in advance to prepare a sealing ring. It should also be noted that a field-type capacitor is required to assemble the radiator. The input resistance of the model should not exceed 20 ohms. Windings are installed next to the rod.
Radiators based on reflector
Emitters of this type are distinguished by a highconductivity. Models operate at 35 V. Many devices are equipped with field capacitors. Make a magnetostrictive radiator with your own hands is quite problematic. First of all, you need to pick up a rod with a small diameter. In this case, the terminals are prepared with a conductivity of 4 microns.
The impedance in the device must bemake up from 45 ohms. The plate is mounted on a stand. The winding in this case must not touch the terminals. At the bottom of the device must be a circular stand. To fix the ring, a usual tape is often used. The condenser is soldered over the manganite. It should also be noted that the rings are sometimes applied with overlays.
Devices for echo sounders
For echo sounders, it is often usedmagnetostrictive radiator. How to prepare a model yourself? Self-made modifications are made with a conductivity of 5 microns. The impedance of their average is 55 ohms. To produce a powerful ultrasonic generator with your own hands, the rod is applied at 1.5 cm. The winding of the solenoid is wound with a small pitch.
Experts say that the racks forradiators are more suitable to choose from stainless steel. In this case, the terminals are used with low conductivity. The capacitors are of different types. The limiting voltage of the emitters is at 14 watts. Rubber rings are used to fix the rod. At the base of the device, tape is wound. Also worth noting that the magnet must be installed in the last place.
Modifications for Fishermen
Devices for anglers are collected only fromwire capacitors. First you need to install a rack. It is more expedient to use rings with a diameter of 4.5 cm. The winding of the solenoid must fit snugly against the rod. Quite often, the capacitors are soldered at the base of the emitters. Some modifications are made on two terminals. Ferrite rod must be fixed on the insulator. To strengthen the ring is used tape.
Low-impedance models
Low-impedance devicesoperate at a voltage of 12 V. Many models have two capacitors. To assemble the device generating ultrasound, with their own hands, a 10 cm rod will be required. At the same time, the capacitors on the radiator are installed in a wire type. The winding is wound in the last turn. It should also be noted that a terminal is required to assemble the modification. In some cases, field capacitors of 4 microns are used. The frequency parameter will be quite high. It is better to install the magnet over the terminal.
Devices of high wave resistance
Ultrasound transducers of high resistancewell suited for short wave receivers. Collect the device on its own can only be based on transient capacitors. In this case, the terminals are tying high conductivity. Quite often the magnet is mounted on the rack.
The stand for the radiator is used at low altitude.Also it should be noted that one rod is used to assemble the device. To isolate its base, an ordinary electrical tape is suitable. In the upper part of the radiator there must be a ring.
Rod devices
Scheme of ultrasonic radiator of rod typeincludes a conductor with a winding. Condensers are allowed to use different capacities. In this case, they may differ in conductivity. If we consider a simple model, the stand is prepared in a circular shape, and the terminals are set to 10 V. The winding of the solenoid is wound in the last turn. It should also be noted that the magnet is selected neodymium type.
The rod is directly applied to 2.2 cm.The terminals can be installed on the lining. It should also be mentioned that there are modifications to 12 V. If we consider devices with field capacitors of high capacity, then the minimum diameter of the rod is allowed 2.5 cm. In this case, the winding must be wound up to the insulation. A protective ring is installed in the upper part of the radiator. Stands can be made without a lining.
Models with unijunction capacitors
Emitters of this type give out conductivity tolevel of 5 microns. At the same time, the wave resistance index at them reaches a maximum of 45 ohms. In order to independently manufacture the radiator, a small stand is prepared. At the top of the stand must be a rubber lining. It should also be noted that the magnet is prepared by the neodymium type.
Experts advise to install it on the glue.The terminals for the device are selected at 20 watts. Directly the condenser is installed above the cover plate. The rod is used with a diameter of 3.3 cm. At the bottom of the winding there must be a ring. If we consider the model as two capacitors, then the rod can be used with a diameter of 3.5 cm. The winding must be wound up to the very base of the radiator. In the lower part of the drain tapes are glued. The magnet is installed in the middle of the rack. At the same time, the terminals must be on the sides.
