Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 30 for “"Temperature Compensation"”.
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Design Technique for Analog Temperature Compensation of Crystal Oscillators
… the stability of a crystal oscillator with temperature variations of the environment. They are temperature control and temperature compensation. Temperature control involves placing the sensitive components of an oscillator in a temperature stable chamber. Usually referred to as an …
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Temperature Compensation Improvements for Impedance Based Structural Health Monitoring
… of structures. Environmental variables such as temperature present a challenge to assessing the veracity of damage detected through statistical modeling of impedance signals. An effective frequency shift method was developed to compensate impedance measurements for changes resulting from …
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Development of ultra-stable MEMS oscillators with 10⁻¹¹-level frequency stability via dual-mode temperature compensation
… Building on this platform, we evaluate how temperature variations and electronics-induced phase drift fundamentally limit the achievable stability of MEMS-based clocks. The first architecture is a single-mode ovenized clock in which the resonator is mounted on a temperature-regulated copper …
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Modeling of Circadian Rhythms: Robust Temperature Compensation in Drosophila melanogaster and Testable Hypotheses in Neurospora crassa
… biological clock, and that the clock is temperature compensated. However, the molecular mechanism of circadian rhythms began to come clear only after the discovery of the period (per) gene in Drosophila melanogaster in 1971, and the frequency (frq) gene in Neurospora crassa in 1973. Since …
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A low-power analog logarithmic map circuit with offset and temperature compensation for use in bionic ears
… A logarithmic current-mode A/D converter with temperature compensation and automatic offset calibration is presented in this paper. It employs a dual-slope, auto-zeroing topology with a 60 dB dynamic range and 300 Hz sampling rate, for capturing the envelope of speech signals in a bionic ear. …
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Compensação de temperatura para sensores de corrente elétrica baseados em redes de Bragg em fibras ópticas
Study and the development of temperature compensation for electrical current sensors based on fiber Bragg gratings using the twin gratings technique. The measurement of electric current by opto-mechanical sensors is very well described in the literature, as well as techniques that propose the …
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Effects of temperature on the electrical impedance of piezoelectric elements
… impedance can also occur due to changes in temperature. Piezoelectric materials have been known to have temperature dependency regarding their basic properties, such as the dielectric constant and the piezoelectric coefficient. In this thesis, this temperature dependency will be …
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Hot-thermistor spirometry for the artificial ventilation of infants
… and clinical applications are discussed. A new temperature-compensated hot-thermistor anemometer/spirometer was developed because the wide variety of spirometers described previously for-measuring respiratory volumes •and volume flow rates were unsatisfactory for routine use in monitoring infant …
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Development of a Miniature, Fiber-optic Temperature Compensated Pressure Sensor
… The measurement of physical parameters (such as temperature and pressure) in extremely harsh environment is one of the most intriguing challenges of this field, and is highly valued in the automobile industry, aerospace research, industrial process monitoring, etc. [2]. Although the semiconductor …
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Non-silicon Microfabricated Nanostructured Chemical Sensors For Electric Nose Application
… issues like sensitivity, selectivity, stability, temperature influence, humidity influence, thermal characterization, drifting problem etc. of SMO gas sensors have been intensively investigated. A novel approach to improve temperature stability of SMO (including tin oxide) gas sensors by applying …
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Miniature fiber-optic multicavity Fabry-Perot interferometric biosensor
… interferometric (MFPI) sensors with built-in temperature compensation were designed and fabricated for thin-film measurement, with applications in chemical and biological sensing. Both the tubing-based MFPI sensor and microgap MFPI sensor provide simple, yet high performance solutions for …
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Label-free DNA Sequence Detection Using Oligonucleotide Functionalized Fiber Probe with a Miniature Protrusion
… interferometer (Micro-FBGI) has the intrinsic temperature compensation capability. The micro-intrinsic Fabry-Perot interferometer (Micro-IFPI)features simple signal processing due to its simple configuration. Successful DNA immobilization and hybridization have been demonstrated onto the 25μm …
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Analysis and design of high-transconductance RF mosfet voltage to-current converters
… Circuits (OGFCs) ere implemented with a new temperature-compensation scheme, designed to operate well in an industrial environment (-40°C - +8S°C). It is found that the best types of V -I converters were the DSFCs which, offer a more accurate value of Gt (3.386mS) and the THO less than -S7dB …
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Electrooptic electric field sensor for dc and extra-low-frequency measurement
… Niobate were identified as the main sources of temperature instability. A new method of temperature compensation of the quarter-wave plate is proposed. Due to the temperature instability of Lithium Niobate, mainly attributed to the pyroelectric effect and natural birefringence, it is difficult …
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Computer data acquisition, control, and analysis for the University of Tennessee at Chattanooga's internal combustion engine labratory
… dynamometer system to monitor the temperature of the exhaust gases at different locations and the coolants entering and leaving the dynamometer and the radiator.Those thermocouples have an output signal of O - 55 mv.The TESCOM gas analyzer system measures the concentrations of the …
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Micro- and nano-electrode arrays for electroanalytical sensing
… produced by EBL and NIL. A dissolved oxygen and temperature sensor incorporating a working microelectrode array was also designed and fabricated. The sector comprised a densely packed array of 2.5 mm radius electrodes and a micro-reference electrode, both of which were covered with an agarose …
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Liquid level measurement using a coplanar transmission line
… user calibration from the line's end points, and temperature compensation. A T-shaped line, which concentrates the field around its open end, was used for other applications such as, evaporation monitoring, measurement of slurry settlement, and to observe the effect of acids, bases, and salts in …
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Study of A Direct Measuring Skin Friction Gage with Rubber Compounds for Damping
… to create an even flow over the surface, and for temperature compensation. In high speed testing the oil leaks out; therefore, a gage with rubber to fill the gap instead of oil was introduced This study employed a finite element method model to fully understand the strains involved with the rubber …
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Design and fabrication of a prototype aluminum nitride-based pressure sensor with finite element analysis and validation
… of the differential system is also studied and temperature compensation is developed to improve system robustness. The portable electrical circuit involving the frequency measurement system is finally designed and evaluated. Such a sensor could serve as a key component in artificial skin or be …
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