The form qualities of precision components are essential for their functionalities. The Peak-to-Valley parameters are widely adopted to assess the form accuracy of optical components. The commonly used least squares method is prone to over-estimation, thus the Chebyshev fitting should in turn be implemented. In this paper the original minimax optimization problem is converted into an unconstrained differentiable minimization problem by exponential penalty functions. The fitting accuracy and numerical stability are balanced by employing an active-set strategy and adjusting the configuration parameters adaptively. Finally some benchmark data sets are applied to demonstrate the validity and efficiency of this method.

This paper describes an approach to generating reference data sets to evaluate the performance of algorithms used in coordinate metrology for form and geometric tolerance assessment. The approach starts with the reference results, e.g., the solution feature parameter values, and then determines the coordinate data. In this way, the expensive development of reference software is avoided. In this paper we consider the generation of reference data associated with determining the best-fit surface according to the least squares (Gaussian) and Chebyshev criteria.

The paper presents the implementation of analog data acquisition system, in particular controlling with a 6- channel ADC converter AD7656 via the FPGA Xilinx Spartan 3 series. The procedures for data sending from the ADC to the FPGA buffers, their conversion and subsequent transmission to TigerSHARC DSP are described. The digital representations of ADC analog input signals are sent to the FPGA through three lines of serial interface at the physical layer compatible with standard SPI. After processing in the FPGA they are sent to the DSP, with the participation of the lines in standard LVDS. The paper discusses the properties of related interfaces, standards, procedures and control of ADC issues as well as algorithms of FPGA configuration program and functions implemented in this system. Selected results of functional testing are shown.

Optical chemical sensors usually utilize immobilized reagents in a solid matrix usually in the form of a monolith or a thin film. The reagents immobilized into the sensor are responsible for the extraction of the analyte into the sensing material and generating an optical signal proportional to the change in the concentration of the analyte. In the work presented here we propose to use transparent polymethacrylate matrix (PMM) for physical immobilization of analytical reagents. The using of PMM allowed us to combine the capability of the solid phase to immobilize reagents without losing the matrix transparence and the capability of the reagents to participate in the analytical reaction with analytes accompanied by an optical effect.

This paper describes a method for the determination of hydrogen chloride gas in ambient air. The method involves analyte gas sampling in aqueous solution by using diffusion scrubber coupled ion chromatography with suppressed conductivity detection for subsequent ion analysis. Method detection limit is less than 0.05ppbv. Semi-automated a half hourly measurement results for Seoul air are presented.