DE2334384A1 - Detector for fast movement processes - with picture signal which is obtained through high speed shutter of camera tube - Google Patents

Abstract

The signal is applied to a signal storage tube for a full frame perid, and then scanned at the same or at a different standard and displayed on a T.V. monitr. The electron beam deflections in the camera and storage tube are synchronised. An electronic picture converter tube keyed by an H.V. pulse whose width is equal to the required exposure time, is used as the high speed shutter. The shutter and the camera tube are coupled through a fibre optical system. Sensitivity of the camera tube, e.g. of the vidicon type, is controlled by signal plate voltage variation, and is coupled with the exposure time so that the camera tube output signal is constant when the illumination does not change.

Description

ROBERT BOSCH FERNSEHANLAGEN GMBH, ₆₁ Darmstadt, Robert-Bosch-Str.

_. .. "_o, /" · "PLI / Mi / Kn

Rl.-No. 158V7? 6/28/73

Device for recording and displaying very fast movement processes.

There is occasionally the task of a certain phase of a very fast movement process in an observable image to hold on. The solution to this problem brings with the application of the photographic technique because of the development process often unsustainable time lag. If you use a television camera to record the movement process, because of the Movement of the object during operation and normal playback only get a 'blurred single image, even if the exposure time is shorter than the sampling period. Even when using a fluorescent screen with a long afterglow period, the image impression is unsatisfactory.

The device according to the invention for image acquisition faster Movement processes and their immediately following representation is characterized in that the one image signal obtained with a quick-release fastener for the duration of a full image period of a signal storage tube and then scanned with the same standard or a standard that deviates from the input standard is made visible on a television receiver.

In this way, rapidly progressing, e.g. ballistic processes can be captured and displayed practically immediately Carry out series of tests without wasting time, fix sporting moments or natural events and the like. Advantageous a known image converter is used as a quick-release fastener, the electrodes of which are briefly activated by a pulse are biased so that an image of the image projected on the photocathode is displayed on the fluorescent screen of the image converter appears. This enables exposure times of up to 1 η sec.

-Z-

509829/0320

ROBERT BOSCH FERNSEHANLAGEN GMBH

Rl.-No. 1584/73 - 2 - ■

The deflection of the electron beam in the image pickup tube and in the storage tube is preferably carried out synchronously. It is Also useful when using an image converter tube as a quick-release fastener, the coupling between the two tubes via each to make a fiber optic. An advantageous development of the invention is that the sensitivity of the pickup tube is made dependent on the duration of the exposure, so that regardless of the exposure duration for the same scene lighting the same output signal level is always obtained from the image pick-up tube. E.g. the sensitivity at a vidicon tube can be influenced by changing the signal plate voltage.

In the following, the invention is explained with a schematically drawn figure showing an embodiment. In the exemplary embodiment, an overall arrangement using an electronic quick-release fastener is shown. The scene is imaged on the image converter 2 with the aid of optics. This image converter, which serves as a quick release, is coupled via fiber optics to the camera tube 3i, which is also provided with fiber optics. The image signal obtained at the output of the camera tube 3 is fed to the signal memory 5 via a gate circuit k. The gate circuit h is used to blank a single image period from an image signal sequence. The image signal appearing at the output of the gate circuit is fed to the signal memory 5 and, after storage, is taken from the signal memory and displayed on the picture tube 6. Here the image can be reproduced and evaluated for a longer period of time.

This transmission takes place in detail as follows: The camera and the signal memory are both from the pulse generator 7, which works with the desired scanning standard, synchronized. The pulse generator 8 emits a high voltage pulse

5 09829/0320

ROBERT BOSCH FERNSEHANLAGEN GMBH

Rl.-No. 158V75 - 3 -

for the electronic "quick release", for example can be triggered manually at a desired moment. The duration of the pulse corresponds to the desired exposure duration for the image pickup tube. The pulse fed to the quick release is introduced into the logic 9 at the same time. These ensures that the beam flow of the image pickup tube on the camera 3 is blocked at the time of the start of the exposure and remains blocked until the next V pulse for synchronization of the vertical deflection device of the camera arrives. This V-impulse opens at the same time, the gate circuit for the Duration of 2 partial images making up a full image or a multiple thereof. In this way it is in the latch the image signal of the camera is stored exactly at the start of the scan. After saving, the logic ensures that the signal memory is switched to reading. On the Picture tube 6 then appears the picture signal in the form of a standing momentary picture, which is for at least a quarter of an hour can represent. The image corresponds to a movement phase recorded during the exposure time.

Claims (2)

ROBERT BOSCH FERNSEKANLAGEN GMBH Bl. -No. 158V75- h - claims 1. A device for detecting fast movements, characterized in that the image signal obtained via a quick-release fastener (2) from an image pick-up tube (j>) is fed to a signal storage tube for the duration of a full image period and then scanned with the same or a standard deviating from the input standard and is made visible on a television receiver (6). 2. Device for recording rapid movement processes, thereby characterized in that the deflection of the electron beams in the pickup tube and signal storage tube runs synchronously. 3. Device for detecting rapid movement processes according to claims 1 and 2, characterized in that as a quick lock an electronic image converter tube with a high voltage pulse, the duration of which is equal to the desired one Exposure time is, is keyed, is used. H. Device for the detection of rapid movement processes, characterized in that the coupling between the shutter and the camera tube takes place via fiber optics. 5 device for the detection of fast movement processes, characterized in that the sensitivity of the image pickup tube, E.g. of the vidicon type, coupled by changing the signal plate voltage with the exposure time is that with constant illumination of the process to be recorded always the same output signal of the camera tube is obtained. 509829/03 2 0