Speaker
Description
Existing mechanical methods of helical scanning of recorded signals during continuous analog visible registration complicate the design of analog recorders with continuous visible recording of low-frequency processes and periodic frame output. They reduce their reliability and accuracy, complicate sweep step adjustment, increase power consumption and size, and introduce additional static and dynamic recording errors. To address these shortcomings, an electronic helical scanning method and supporting device for continuous analog visible recording have been proposed, analyzed, and tested.
However, both with known mechanical and with the proposed electronic helical scanning methods for continuous analog visible recording, the recording zero lines are tilted relative to the direction of recording media movement by certain angles. This causes the actual signal recording speeds to differ from the media movement speed, leading to additional amplitude and spectral errors in the visible signal recording. To eliminate this and other shortcomings of helical scanning, an electronic method for line-by-line step scanning of continuous visible recordings is proposed. According to this method, an additional step voltage is applied to the measuring galvanometer simultaneously with the recorded signal being fed. The step duration of this step voltage is equal to the recording duration of one line, and the instantaneous step increment after each recording line is equal to the ratio of the required recording scan step to the galvanometer sensitivity.
Furthermore, when determining discrete recording deflection angles and corresponding voltage steps, taking into account the static errors of helical scanning, electronic line scanning is performed with a uniform digital scan step, compensating for and eliminating the static errors of helical scanning.