SU768013A2 - Television stroboscopic camera - Google Patents

Description

(54) TELEVISION STROBOSCOPIC CAMERA

The invention relates to television technology.

A known television stroboscopic camera for observing vibrating objects according to the main author. St. No. 452077 comprising a series-connected transmitting tube with an electronic gate and a video amplifier, a switching beam control device consisting of a series-connected anti-coincidence unit, a differentiation and limiting unit, a trigger and a control pulse former, which are connected to the second input of the anti-matching unit and with the second input of the electronically transmitted transmission tube, an exposure pulse shaping device consisting of heaters when not operating vibration sensor, an amplifier, a second output level regulator which through a torus connected to the second input of the threshold device, and the trigger threshold device, the output of the flip-flop is connected to the corresponding input mntisovpadeny unit, whose output is connected through Wuxi .1itel with an electronic shutter.

However, a well-known television stroboscopic camera has a low image quality that is reproduced on the screen of a receiving device when the conditions of image transmission are changed: illumination, vibra- tion and amplitude of vibrations on the transmission tube with an electronic shutter.

The aim of the invention is to provide an automatic adjustment of the exposure time of a transmission tube with an electronic shutter when the illumination level 10 and the amplitude of vibrations change.

For this purpose, in a television stroboscopic camera for observing vibrating objects containing a series-connected transmitter. an electronic shutter tube and a video amplifier, a switching beam control device consisting of a series-connected anti-coincidence unit, a differentiation and limitation unit, a trigger and a control pulse former, the first 20 and second outputs of which are connected respectively to the second input of the anti-coincidence unit and. with the second input of the transmitting tube with an electronic shutter, an exposure pulse shaping device,

consisting of a series-connected vibration sensor, an amplifier, the second output of which is connected to the second input of the threshold device through a level regulator, a threshold device and a trigger, wherein the trigger OUT is connected to the corresponding input of the anti-coincidence unit, the output of which is connected through an amplifier to an electronic shutter level regulator is connected to the output of the transmitting tube with an electronic shutter, while the sync input of the level regulator is supplied with frame sync pulses, and the level regulator contains The first and second discretization blocks, the pulse shaper, the coincidence block, the first inputs of which are connected to the corresponding outputs of the first sampling block, and the second input are connected to the output of the pulse generator, the input of which is connected to the output of the second sampling block, each of the matches block nonlinearity, the outputs of which are connected to the corresponding inputs of the threshold level generator, with the first, second and synchronous input of the level regulator are Respectively, the first input of the first sampling unit, the first input of the second sampling unit, the second inputs of the first and second sampling units.

The drawing shows the structural electrical circuit of the proposed camera.

The television stroboscopic camera contains a transmission tube with an electronic shutter G, a video amplifier 2, a switching beam control device 3 consisting of an anti-coincidence unit 4, a differentiation and limiting unit 5, a trigger 6 and a driver pulse generator 7, an exposure pulse shaping device 8, consisting from the vibration sensor 9, the amplifier 10, the level regulator 11, the threshold device 12 and the trigger 13, and the amplifier 14, while the level regulator 11 consists of the first 15 and second 16 sampling units, pulse pulley 17, coincidence block 18, N nonlinearity blocks 19, and a threshold level driver 20.

The camera works as follows.

A sinusoidal signal taken from the vibration sensor 9 is supplied through the amplifier 10 to the threshold device 12 and the first sampling unit 15, which consists of a set of threshold and storage elements. Depending on the magnitude of the amplitude of the sinusoidal signal during the frame time, a circuit is triggered that corresponds to a certain level of sampling. The second sampling unit 16 works similarly, which extracts the maximum signal for the frame time from the transmitting tube with the electronic shutter 1. When frame sync pulses enter the sampling units 15 and 16

the signals corresponding to the maximum sampling level go to pulse generator 17 and block 18, respectively. The pulse shaper 17 generates a signal whose amplitude depends on the signal that characterizes the maximum sampling rate for a given frame. This impulse through the coincidence unit 18 enters a certain nonlinearity unit 19 depending on the signal from the first sampling unit 15.

Q Nonlinearity blocks 19 realize the pre-calculated dependence of the exposure time on the illumination and amplitude of the image vibrations on the photosensitive layer of the transmission tube with the electronic shutter 1. Their number corresponds to

the number of sampling levels of the first sampling unit 15, the number of which depends on the specific conditions of use of the proposed camera. Threshold level produced by shaper

0 threshold level 20, is determined by the magnitude of the signal coming from the nonlinearity blocks 19 ...

At the output of the threshold device 12, opposite-voltage voltage pulses are generated, which control the operation of trigger 5. The impulse formed by the latter. These flows through the anti-coincidence unit 4 and the amplifier 14 to the electronic shutter. Simultaneously, the pulses from the output of the block of anti-coincidence 4 after differentiation

- and restrictions are applied to the input of the trigger 6 and the driver control pulses 7, which are part of the switching beam control device 3. Its purpose is to turn off the normally closed switching beam on

5, the time during which the transmission tube with the electronic shutter 1 is not exposed. At the same time with the unlocking pulses, the locking pulses are sent to the anti-coincidence unit 4.

 The proposed camera makes it possible to obtain a sharp and sedentary image and maintain it best when the conditions of transmission of the input image change. Besides; gogo, we offer camera

5 allows us to significantly expand the field of application of pulsed television sensors, which distinguishes it from the prototype.

Claims (2)

1. Television stroboscopic camera for observing vibrating objects according to the author. St. No. 452077, characterized in that, in order to ensure automatic adjustment of the exposure time of the transmission tube with an electronic shutter when the illumination and vibration amplitude change, the second input of the level regulator It is connected to the output of the transmitting tube with an electronic shutter, while the sync input of the level regulator is supplied with frame sync pulses. 2. A camera according to claim 1, wherein the level controller comprises first and second sampling units, a pulse shaper, a coincidence unit, the N first inputs of which are connected to the corresponding outputs of the first sampling unit, and the second input connected to the pulse shaper output whose input is connected with the output of the second sampling block, each of the N outputs of the coincidence block are connected to the input of the corresponding nonlinearity block, the outputs of which are connected to the corresponding inputs of the threshold level generator, the first, second, and synchronous input of the level controller, respectively the input of the second sampling unit, the second inputs of the first and second sampling units.