SU1205102A1 - Scanning device - Google Patents

Description

The invention relates to optical and optoelectronic instrumentation and can be used in spectrophotometers with periodic scanning of the spectrum, as well as in other systems for the automatic control of non-stationary parametric fields.

The purpose of the invention is to reduce energy consumption, increase reliability, as well as expand the operational capabilities of the device when scanning in a given solid. coal

Figure 1 shows the scanning device, a general view; figure 2 is the same, side view; FIG. 3 is an electrical schematic diagram of an electric motor control; Fig. 4 shows the voltage plots at the points of the electrical circuit indicated in Fig. 3; in FIG. 3, the rotational-oscillatory trajectory of the scanning beam with a ratio of the amplitude of the angle of oscillatory movement to the angular diameter of the scanned field is four.

The device consists of a stepper motor 1, which provides: pulsed rotation of a shaft rigidly mounted on its shaft fork 2, in bearings 3 of which a T-shaped rod 4 rotates freely. The axis X of rotation of the rod 4 is perpendicular to the axis Z of rotation of the engine shaft 1, and the axis the rod t makes an angle of 45 ° with the Z axis. On the axis X of the rod 4, plates 5 are installed, between which the protrusion 7 of the mirror 8 is firmly clamped by a bolt 6, and the reflecting surface of the mirror 8 makes the required angle with the Z axis 9 and risk 10, on a fork 2 us The brackets 11 with a stop 12 and 13. On the rod 4c, weights 14 are arranged to move along the axis. The elastic spring 15 is fixed at one end on the fork 2, and the other end on the rod 4. Reverse 16 are fastened on the fork 2 connection, state is, for example, a pair of LEDs - a photodiode, and a plate 18 is attached to the rod 4, controlling the switching on of sensors 16 and 17, which are included in the control circuit of a stepper motor. The engine control circuit also contains triggers 19 and 20, lo

02.2

elements 21 and 22, an OR 23 logic element, a frequency generator 24 synchronized with the output of the trigger 20 with adjustable frequency, a distributor of 25 pulses, a power amplifier 26 and a stepper motor 1 "Feedback sensors are included in the control circuit through a current-collecting device 27 .

The device works in the following way.

At the time of switching on the voltage, the oscillatory system, consisting of a mirror 8, a rod 4 with weights 14 and a plate 18, as well as a spring 15, is in the equilibrium position, while the position of the plate 18 fixed on the rod 45 ensures the sensor 16 to turn on. 16 gives impulse and trigger

19 is set to the state of logical one. Through the logical element And 21 and the logical element OR 23 pulse sets the trigger

20 in the state of logical unit and turns on the generator 24, synchronizing the output frequency in phase with the beginning of the applied pulse. Through the logical element And 22, the signal enters the distributor 25 pulses, then to the amplifier 26 power and stepper motor 1, which comes in. rotational motion.

At the initial moment, the oscillatory system is at rest. When you turn on the engine 1, it comes into rotational movement around the Z axis along with the engine shaft. At the same time, the centrifugal force acts on the loads -14, which, by deforming

the spring 15 rotates the oscillatory system around the axis X. The rotational speed of the shaft of the engine 1 is increased to a value which determines the magnitude of the centrifugal force acting on the weights 14. at which the oscillatory system and the associated plate 18 rotates around the axis X at an angle providing a sensor 17 o

The impulse from the sensor 17 through the logical element OR 23 transfers the trigger 20 to the state of logical zero, thereby closing the coincidence circuit consisting of the logical element AND 22. The engine 1 stops, after which the oscillator 3

the system continues to move by inertia until it collides with the stop 12. Next, the system oscillates around the X axis and, moving in the opposite direction, passes the equilibrium position, while the sensor 16 induces a pulse that sets the trigger 19 to the logical zero state, and logical element And 21 does not miss it. After the collision with the stop 13, the oscillating system again passes the equilibrium position, the sensor

16 impulse and the management scheme works in the same way as described.

However, in the equilibrium position, the system has a significant initial speed and the time interval between the operation of the sensors 16 and

17 shorter than in overclocking mode.

1205102

During this period of time, determined by the position of the weights 14 on the axis of the rod 4, the motor 1 rotates the system around the Z axis by the required angle.

Thus, the device performs scanning of the beam reflected from the mirror 8 along a rotational-oscillating trajectory with the required

10 by the ratio of the amplitude of the oscillation angle to the angular diameter of the scanned field, determined by the positions of the sensor 17 and the stops 12 and 13.

15 The use of the invention ensures the reduction of energy intensity, increase of reliability, as well as expansion of the operational capabilities of the device when scanning in

20 given solid angle.

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Compiled by V. Drin Editor A. Ogar Tehred S. S Migunova Proofreader M. Maksimnnnets

Order 8526/49 Circulation 525 Subscription VNISHS USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5

Branch ShSh Patent, Uzhgorod, ul, Project, 4

Claims (1)

A SCANNING DEVICE comprising a swinging mirror, pivotally mounted on a motor shaft using a coupling and interacting with the shaft using an elastic element, the mirror swing axis being perpendicular to the shaft axis, characterized in that, in order to reduce energy consumption and increase reliability, it is equipped with a load rod at one end and an axis at the other end, perpendicular to the rod, rigidly connected to the axis of swing of the mirror and pivotally connected to the coupling, made in the form of a fork, while the elastic element is fixed on and the plug, the rod is installed at an angle to the motor shaft and interacts with the elastic element, and the engine is made with the possibility of pulse rotation of the shaft.