We propose a self-reverse-biased solar panel optical receiver for energy harvesting and visible light communication. Since the solar panel converts an optical component into an electrical component, it provides both energy harvesting and communication. The signal component can be separated from the direct current component, and these components are used for communication and energy harvesting. We employed a self-reverse-biased receiver circuit to improve the communication and energy harvesting performance. The reverse bias on the solar panel improves the responsivity and response time. The proposed system achieved 17.05 mbps discrete multitone transmission with a bit error rate of 1.1 x 10^-3 and enhanced solar energy conversion efficiency.

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Modifications are described to an Edwards IBMA 1 ion beam thinning machine which permit the earth current from the specimen holder t o be monitored continuously. The earth current, which gives a n indication of the ion beam current, is used to trip out the HT supply to the ion guns and the timer whenever the ion current drifts outside a preselected range. These modifications have been carried out on two ion bean1 thinning units, which operate independently from the same high voltage power supply. Trials with the modified machine have shown that the thinning rates of aluminium, copper and glass specimens all increase when the specimen holder, which is normally insulated, is earthed through the current monitor.Abstract A high pressure electrical feedthrough design is presented for use with gaseous pressure transmitters which has the advantages of being easy to construct, is refillable, and long lasting. Its usable pressure range extends to at least 5 kbar.

A near-field storage system using a solid immersion lens (SIL) has been studied as a high-density optical disc drive system. The major goal of this research is to improve the robustness of the air-gap controller for a SIL-based near-field recording (NFR) system against dynamic disturbances, such as external shocks. The servo system is essential in near-field (NF) technology because the nanogap distance between the SIL and the disc is 50 nm or less. Also, the air-gap distance must be maintained without collision between the SIL and the disc to detect a stable gap error and read-out signals when an external shock is applied. Therefore, we propose an improved air-gap control algorithm using only an acceleration feedforward controller (AFC) to maintain the air-gap distance without contact for a 4.48 G at 10 ms shock. Thus, the antishock control performance for the SIL-based NF storage system in the presence of external shocks is markedly improved. Furthermore, to enhance the performance of the antishock air-gap control, we use the AFC with a double disturbance observer and a dead-zone nonlinear controller. As a result, the air-gap distance is maintained without contact for a 6.56 G@10 ms shock.

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