Write compensation using the thermal transfer function in an optical disk.
The theoretical basis for a write-compensation scheme is developed with a simplified thermal transfer function in an optical disk. The thermal transfer function is analytically approximated to a first-order exponential filter similar to that of an integrating circuit. A write-compensation method is then given directly by the inverse function of the filter. A simplified form of the compensation is also derived, and this is verified by experiments. This method eliminates the thermal interference and shows how to form mark edges uniformly for an arbitrary optical disk.
Latent heat effects of pulsed laser beam induced temperature profiles in optical recording thin films.
A numerical algorithm for the computation of the temperature profile induced by a pulsed laser beam has been developed by means of the quasi-implicit technique. In this calculation the effect of the latent heat of fusion was included in the temperature calculation. Some examples are given to demonstrate the utility of the numerical technique for calculating temperature profiles in optical recording media. The effects of various thermodynamic properties of recording media are apparent in the examples presented in this work, and the result of the calculated temperature information can be readily applied to the study of the writing mechanism. Extensions to a multilayered thin film system can be easily done simply by modifying the matrix elements which involve the interfacial layers.
Research on integral error calibrating system of high-voltage electric energy measurement device
To the question that there is no accuracy grade to the existed HV energy measuring system, a design scheme to calibrate the integer error of HV energy measuring device is provided in this paper. The hardware of the calibrating system, including test power source, signal source, power benchmark system, power source measuring and regulating circuit, has been introduced in detail. The function of the monitoring and operating software is also discussed in the paper.