The factor analysis literature includes a range of recommendations regarding the minimum sample size necessary to obtain solutions that are adequately stable and correspond closely population factors.A fundamental misconception about this issue is size, or ratio number variables, invariant across studies.In fact, dependent on several aspects any given study, including level communality variables overdetermination factors.The authors present theoretical mathematical framework provides basis...

This paper presents a capacitive rotary encoder for both angular position and speed measurements. The is mainly composed of three parts: the transmitting segments; pair reflecting electrodes; receiving electrodes. segments together with four mutual quadrature carrier voltages provide modulated electric field. electrodes, which are patterned sinusoidally can encode to phase/frequency signal based on modulation. then digitally decoded in field programmable gate array processor demodulation...

Electrical cross coupling is regarded as a major obstacle to achieving high-performance miniature fiber-optic gyroscopes (FOGs), because it can cause dead bands, which are critical errors in FOGs. Using differential photodiode amplifier has proven be effective rejecting coupled interference. However, the conventional three-op-amp instrumentation cannot provide FOG's bandwidth requirements, of large capacitance and parasitic capacitance. We present high-performance, fully amplifier, where...

Electrical crosstalk in an interferometric fiber-optic gyroscope (IFOG) is regarded as the most significant factor influencing dead bands. Here, we present a six-state modulation (SSM) technique to reduce crosstalk. Compared conventional four-state (FSM) or square-wave (SWM), SSM reduces correlation between voltage and demodulation reference by separating their fundamental frequencies, thus bias error induced The measured band of 1500-m IFOG approximately 0.02 °/h using FSM 0.08 SWM, whereas...

This paper reports a transceiver module with high polarization extinction ratio (PER) for the polarization-maintaining interferometric fiber optic gyroscope (PM-IFOG). utilizes graded-index lens featuring slanted face coated multilayer film, enabling simultaneous collimation and beam splitting. Configurations of splitter corresponding are simulated designed using ray matrix method physical optical propagation. The loss is about 3.77 dB, PER exceeds 25 dB. IFOG prototype implemented by...

Capacitive rotary encoders are widely used in motor velocity and angular position control, where high-speed high-precision angle calculation is required. This paper illustrates implementation of arctangent operation, based on the CORDIC (an acronym for COordinate Rotational DIgital Computer) algorithm, capacitive encoder signal demodulation an FPGA to obtain position. By skipping some unnecessary rotation we improve algorithm's computing accuracy. Experiments show that residue error almost...

A novel fault diagnosis method for the space-borne interferometric fiber-optic gyroscope (IFOG) is presented in this paper. The noise source of analyzed first. Then, prediction model random walk coefficient (RWC) established based on radiation-induced attenuation effect optical fiber, and estimation RWC developed by using detected signal acquired photo-detector. In addition, an improved iterative to calculate with output data IFOG orbit proposed. three values mentioned above are compared...

The first-principle calculations have been performed to study the pressure-induced effects on structural, electronic, elastic and lattice dynamical properties of defect chalcopyrite CdIn 2 Te 4 . optimized structural parameters are well consistent with available experimental theoretical data. evolutions energy gaps, constants, moduli, phonon dispersion spectra, Raman scattering as zone-center frequencies pressure investigated in detail. Our results show that has a direct bandgap gaps...

A novel digital compensation scheme is demonstrated to control the gain of modulation chain and suppress influence quantization error on bias. The produced by multiplied scaling factor theoretically analyzed. Simulations indicate that varies with input angular velocity temperature, which verified experiments. By switching integration compression operations in chain, this reduced, while automatic reset phase ramp register achieved. We test a fiber optic gyroscope. results reveal...

First‐principles calculations are performed to study the effects of biaxial strains and high pressure on structural, electronic, lattice dynamical properties defect chalcopyrite HgM 2 Te 4 (M = Al, In) semiconductors. The evolutions optimized structural parameters, band‐gap energy, crystal‐field splitting ‐point phonon frequencies with strain have been analyzed. parameters reasonable compared existing experimental results. Both compounds undergo an indirect direct band gap transition under...