Normable metrological characteristics of groups of seismic detectors

An analysis is made of metrological characteristics of seismic detectors categorized in different groups. A discussion is presented of aspects of calculating the characteristics of a group from the parameters of individual detectors while using different methods to compare these parameters.Translated from Izmeritel'naya Tekhnika, No. 3, pp. 45–47, March, 1995.     

All-digital ring-wedge detector applied to fingerprint recognition

An all-digital ring-wedge detector system is presented that simulates the analog multielement array commonly used in coherent optoelectronic processors. The system is applicable with either hard-copy or digital imagery. Using neural-network software, we demonstrate high accuracy for the recognition of fingerprints, including both orientation and wide-scale size-independent sortings by using ring-only and wedge-only input neurons, respectively. Also, the system is applied on windowed subregions of fingerprint imagery, providing a feature set that summarizes localized information about spatial-frequency content and edge-angle correlations. Examples are presented in which this localized spatial-frequency information is used to produce local ridge-orientation maps and to detect regions of poor print quality. In summary, both direct-image data and spatial-transform data are found to be important.     

All-digital ring-wedge detector applied to image quality assessment

In the automatic assessment of image quality we obtained a high accuracy in the classification of image degradations in a manner that is widely independent of scene content. Using an all-digital ring-wedge detector system combined with neural-network software, we conducted several experiments in which the end goal is to classify images according to numerical quality scales. Experiments are presented to stress the importance of both local and global image quality assessment. Two databases of degraded images were prepared. One uses five levels of Gaussian blur to simulate depth of field. The other was prepared with lossy compression and recovery with artifacts generated by a JPEG (Joint Photographic Experts Group) compression algorithm. In quantitative terms our best sorting of Gaussian blur without knowledge of the original scene was to an accuracy of 96%. For degradation using JPEG we obtained an accuracy of 95% without knowledge of the original and 98% when the original scene is available as a reference.     

Laser dynamic goniometer metrological characteristics

Accuracy characteristics are considered for a laser dynamic goniometer (LDG) for calibrating prismatic angle measures, and a method of increasing the accuracy is proposed. Estimates are given for the confidence bounds to the total error of the LDG, which constitute ±0.08″ (2σ) on measuring multifaced prisms by cross calibration and ±0.13″ on measuring other prismatic measures (2σ). Translated from Izmeritel’naya Tekhnika, No. 5, pp. 19–23, May, 2009.     

A theoretical study of the metrological characteristics of a calibrated fresnel attenuator of the beam power of laser radiation

A theoretical investigation of the metrological characteristics of a precision Fresnel attenuator is performed for the purpose of determining whether it can be employed as a comparison standard intended for comparing the domestic primary standard of the unit of mean power of continuous laser radiation with an absolute cryogenic radiometer.     

A method of improving the metrological characteristics of contactless conductometers

A method of improving the metrological characteristics of monitoring instruments, based on the use of a system of coupled oscillations as a highly sensitive recorder of the state of balance of a measuring circuit and simultaneously as a converter of the measured and compensating quantities in the information signal is considered. It is shown that it is possible to improve the metrological characteristics by constructing an intelligent measuring mechanism using a system of active interacting components. __________ Translated from Izmeritel’naya Tekhnika, No. 5, pp. 58–61, May, 2007.     

干涉型全光纤加速度地震检波器

以全光纤迈克尔逊干涉仪为基础,研制出由地震敏感元件组成的单分量双光路加速度地震检波器样机,并提出了三分量检波器的设计方案。为了考察缠绕光纤前后顺变柱体弹性模量的变化,做了拉伸和压缩实验,以确定其作为敏感元件的关键特性。该检波器可用于检测小到0.01g的加速度。     

Standardizing metrological characteristics for industrial radiation pyrometers

Translated from Izmeritel'naya Tekhnika, No. 3, pp. 39–41, March, 1992.     

Monitoring metrological characteristics for built-in eddy-current sensors

Translated from Izmeritel'naya Tekhnika, No. 11, pp. 37–38, November, 1988.