The micromanipulator

 

(57) Abstract:

Applications: instrumentation, to create the micrometric movements in biomedical engineering. The inventive micromanipulator includes a movable carriage 1, the piezoelectric actuator in the form of a shaft with the rotor 6, which is connected through the pushers 9 with the annular piezoelectric elements 7 and 8, one of which is mounted on the shaft, and the second on the housing, and a control system consisting of a generator 10 of the high-frequency pulses, managed key 11, shapers 14, 13 frequency and duration of the excitation pulses, respectively, and the power source 12. 2 Il.

The invention relates to the instrument and can be used to create the micrometric movements in biomedical engineering, chemical, electronic and other industries.

Known micromanipulator containing movable table and the actuator [1]

Known two-coordinate the installation device, comprising a fixed frame on which are mounted piezoelectric Flexural ("bimorph") elements. The disadvantage of this device is the small range of adjustment of the micrometric movements, drift, and so on [2]

The closest technical Yu expansion of the range of regulation and enable automation of the process of moving the carriage has mounted on it the object is moved using a stepper motor, transmitting the rotation of the micrometer screw [3]

The value of a single micromovings this device is determined by the step motor and stepper motor is determined by the tens of minutes of arc. Further reduction of micrometric movements in such systems can be achieved by setting the reduction gear on the engine or changing the gear ratio of the micrometer screw, which leads to the complexity of the design, increase the size, power and complexity, as well as to limit the possibility of a temporary grouping of micrometric movements that determines the speed of microbody. Micropreemie uniquely tied to the speed and Vice versa.

The objective of the invention is to enable simultaneous formation of small isolated movements and their group velocity (time).

This technical result is achieved that the micromanipulator containing a movable table, which is connected via a screw-nut drive connected to the control unit, the actuator is made in the form of a shaft with a rotor connected via the pushers with the annular piezoelectric elements, one of which is mounted on the shaft, and the second is installed on the housing, and the unit upravleniekrovlia length packs of excitation pulses, managed key generator generation of high frequency pulses of excitation of the piezoelectric elements, the control key is connected to the power source.

In Fig.1 shows a block diagram of a micromanipulator, and Fig.2 plot of supply voltage, explaining the operation.

The device includes a movable carriage 1 is located in the bearing rails 2 connected with the micrometer screw nut 3. The screw-nut 3 are conjugated through a flexible coupling with the shaft 4 of piezo technology 5, comprising a rotor 6, the annular piezoelectric element 7 mounted on the shaft, and the piezoelectric element 8 mounted on the housing, the outer cylindrical side of which is fixed a metal elastic pushers 9, rests in the inner part of the rotor 6.

The control system includes a generator for generating pulses of excitation of the piezoelectric element 10, the managed key 11, the power source 12, the shaping unit 13 duration pack of excitation pulses and the shaping unit 14 frequency burst stimulation.

The operation of the device is as follows.

Even if you have a constant supply voltage at the output of block 12 (plot a, Fig.2), for example, the supply voltage is assetsa the frequency generator 14, forming a pulse frequency control fSL(plot B). In block 13 is formed pulse duration of the control nin accordance with a frequency fCL.The generated control signal (plot) goes on a managed key 11, the output of which are the pulses of power corresponding to the frequency and duration of control pulses (plot D).

Block 10 is converted pulse power in packs of excitation pulses at the resonant frequency of the piezoelectric element with the excitation voltage Uwosb.and frequency frez(plot D).

When the voltage on the piezoelectric element 7 he is excited. Vibrations from the piezoelectric element is transmitted to the plungers 9, which, starting from a friction-braked tappets of the lower piezoelectric element of the rotor, creating a torque shaft. When changing the direction of rotation is connected to the piezoelectric element 8. When this torque is given by the pushers of the piezoelectric element, the rotor 6 is transmitted through the frictional contact of the upper piezoelectric element and further to the load.

The step of piezo technology or the turn angle of the rotor is proportional to the pulse duration control (plot E). The angular rotation of the micrometer screw 3 is giving carriage 1 l (plot E) will be determined by the step of piezo technology and gear ratio of the screw-nut.

The moving speed at a given micropace l will be determined by the pulse frequency control fSL.

The use of the device due to the simultaneous formation of micropedic and their groups have greatly improved the characteristics of the micromanipulator. Thus, the achieved angular step on piezo technology with diameter piezotube 20 mm 30 angle.with that in combination with a micrometer screw-nut with a transmission ratio of 1/500 allows to realize micropreemie 10-2μm, which is at frequency fSP1 Hz provides the speed micromovings 10-2µm/S.

The MICROMANIPULATOR containing a movable table, which is connected via a screw-nut drive connected to the control unit, characterized in that the actuator is made in the form of a shaft with a rotor connected via pushers with integral piezoelectric elements, one of which is mounted on the shaft, and the second is installed on the housing, and the control unit is made in the form of serially connected processing unit frequency burst excitation, managed key generator generation of high frequency pulses of excitation of the piezoelectric elements, and the input control key on

 

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FIELD: physics.

SUBSTANCE: method for optical capturing of a particle in soft biological tissue is based on irradiating the surface of the tissue with a parallel beam of coherent laser radiation and determining the depth z of the captured particle in the tissue. The radiation wavelength λ* is selected depending on the depth z - for z<0.1 mm λ*=450 nm, for z≥0.1 mm λ*=1250·[1-exp(-z/1.35)], where λ* is given in nm and z in mm.

EFFECT: invention provides maximum particle capturing force with minimal heating of the tissue.

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