Solid-state electromechanical converter

FIELD: optics.

SUBSTANCE: proposed converter designed for operation as actuating device in adaptive optical systems has multilayer stack of plates electrically connected in parallel with double-layer ferroelectric ceramic plate with diffused phase transition. One layer of double-layer plate has slot of depth equal to thickness of this layer. Axes of slots in adjacent double-layer plates are disposed in relatively perpendicular planes.

EFFECT: elongated travel distance of operating element, enhanced time and temperature stability.

1 cl, 2 dwg

 

The invention relates to optics and is intended for use as actuators in adaptive optical systems.

Known piezoelectric Electromechanical transducer, which is included with accelerometer [1]. The device includes a multilayer element consisting of piezoceramic plates with metal electrodes connected electrically in parallel. The electrodes are insulated gaps and protrusions for connection with the switching bus. The monolithic design provides high rigidity. However, in the case of use of the element in the composition of the Executive device having an insulating gap causes tensile stress at the boundary between the electrically active and passive parts of the plate, substantially reducing the mechanical strength and the reliability of the device.

The closest analogue is the sensing element of the accelerometer [2], in the form of a monolithic multilayer stack of piezoelectric plates connected electrically in parallel. In piezoelectric plates from one of the electrode surfaces made metallized grooves, the depth of which is 0.3 thickness of the plate. Grooves diffuse filled metal switching tires. The device has a low relative is oefficient transverse conversion when working as part of a piezoelectric accelerometer.

However, as the Executive device known Electromechanical transducer is not a high-driven deformation. Controlled deformation in the piezoelectric Electromechanical transducer is proportional to the intensity of the electric field components in the plates. Especially important is the magnitude of the electric field in the electro-mechanical transducer, made of ferroelectrics with diffuse phase transition [3]. Controlled deformation in the material is proportional to the second degree of electric field intensity. One way to increase the strength of the electric field in the known device is the reduction in the thickness of plates is limited by the mechanical strength of the plate weakened by a groove. Another way is to increase the control voltage is often unacceptable because of the complexity of electronic equipment control system and reduce its reliability.

Claimed as the invention of the solid-state Electromechanical transducer can significantly increase the movement of the working body of the optical system by increasing the controlled deformation of the Converter.

This technical effect is achieved by the solid-state Electromechanical transducer comprising megaloi the first package is electrically connected in parallel magnetotransistor plates with electrodes and metallic grooves, diffuse is filled with the metal patch of the tires, and electrical connector for connection with the control system, the package consists of two plates made of ferroelectric ceramics with a diffuse phase transition, one layer of each double layer plate includes a groove with a depth equal to the thickness of this layer, two-layer plate is oriented in the package such that the layers with grooves alternating with layers without groove and the axis of the slots adjacent two plates arranged in mutually perpendicular planes.

Creating solid-state Electromechanical transducer is made possible thanks to the combination of new design and new material magnetotransistor plates that make up the package. Dual layer construction plate allows you to implement the principle of separation of functions between the layers. Layer with a groove effectively and reliably fulfills the contact function. Electroactive layer without groove can be, without compromising the mechanical strength is polished to a thickness of about 100 micrometers, which allows to significantly increase the electric field strength. The greatest effect of increasing the electric field strength is achieved in ferroelectric ceramics with a diffuse phase transition [3], with a quadratic controlled-strain tension electrical the CSO field. In addition, this material has a very low temperature coefficient of linear expansion and low aging due to the lack of domain structure. The absence of polarization increases the reliability of the device, as no mechanical stresses occurring in the polarized piezoelectric package. Symmetrical cruciform system of grooves provides the same Flexural rigidity of the transducer in two planes, which expands the range of operating frequencies. The combination of all these properties allows you to create highly sensitive Electromechanical transducer with high temporal and thermal stability for use in adaptive optical systems.

The invention is illustrated in the following description and drawings. 1 shows a General view of the solid-state Electromechanical transducer and electrical connections. Figure 2 presents a General view of two adjacent two-layer plates that make up the package.

The device includes a package 1 comprising a two-layer plate 2, made of Magno-niobate lead - ferroelectric ceramics with a diffuse phase transition. Layers 3, 4 two-layer plate 2 is provided with electrodes 5, 6, 7 and rigidly connected by diffusion welding.

In the first layer 3 is made a groove 8 (8.1 and 8.2 figure 2), the depth of which RA is the thickness of the layer 3. The groove 8 is metallized. Two-layer plate 2 rigidly connected to the package 1 by diffusion welding. This plate 2 is oriented in the package 1 so that the layers 3 with a groove alternating with layers 4 of the groove and the axis of the adjacent grooves 8 are located in mutually perpendicular planes (8.1 and 8.2 figure 2).

The grooves 8 diffuse filled metal switching tires 9, which by means of conductors 10 and 11 are connected through the electrical connector 12 with the output amplifier of the control system 13.

The package 1 is rigidly connected with the final ceramic plates 14, 15. Plate 14 functions as the Foundation of the Electromechanical transducer and rigidly fixed in the housing of the optical system. Plate 15 through the plunger 16 is connected to the working body of the 17 - item partitioned mirrors or mirrors with controlled shape of the surface.

The device operates as follows. The control signal from the output of amplifier 13 is supplied through the connector 12 and the conductors 10, 11 on the switching bus 9 two-layer plate 2. In layer 4, an electric field, the intensity of which is inversely proportional to the thickness of the layer 4. Due electrostriction effect of the deformation layers 4 all two-layer plate 2. Electrostriction deformation of magnetoterapia with a diffuse phase transition is proportional to the second degree of electric field intensity. The total deformation of the package 1 is transmitted through the plunger 16 working body systems 17.

New design of the Electromechanical Converter, which allows you to create a high electric field intensity in the electroactive material, and selecting the ferroelectric material, effectively transforming the high electric field strength in the warp, which exceeds the controlled deformation of the known piezoelectric materials, helped to create a highly effective Executive device for adaptive optical systems infrared range, require significant movement of the working body, commensurate with the wavelength of the applied laser radiation. Due to the additional technical effect of high temporal and thermal stability - the new device will find application in laser optical systems for aerospace purposes.

Sources of information

1. As the USSR №1682938, MCL. G 01 R 15/09, 1991.

2. RF patent №2150117, MCL. G 01 R 15/09, 1998.

3. Venice YU. and other Segneto and antisenescence collection of barium titanate. - M.: Chemistry, 1985, str.

Solid-state Electromechanical transducer comprising a multilayer package connected electrically in parallel magnetotransistor plates with electrodes and Metallistov the governmental grooves, diffuse is filled with the metal patch of the tires, and electrical connector for connection with the control system, wherein the package consists of two plates made of ferroelectric ceramics with a diffuse phase transition, one layer of each double layer plate includes a groove with a depth equal to the thickness of this layer, two-layer plate is oriented in the package such that the layers with a groove alternating with layers without groove and the axis of the slots adjacent two plates arranged in mutually perpendicular planes.



 

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FIELD: optics.

SUBSTANCE: proposed converter designed for operation as actuating device in adaptive optical systems has multilayer stack of plates electrically connected in parallel with double-layer ferroelectric ceramic plate with diffused phase transition. One layer of double-layer plate has slot of depth equal to thickness of this layer. Axes of slots in adjacent double-layer plates are disposed in relatively perpendicular planes.

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