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Based on the temperature sensing quartz crystal resonators RKT206 the digital medical thermometer, electronic digital and analog controllers and industrial thermometers (-50…+125°C; accuracy class up to 0.05%) are developed and made.
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Ltd. "SKTB ELPA" designed and engineered sensors for measuring pressure of various fluids: fresh and salt water, oil and its derivatives products, food products (milk, paste).
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To visualize the characteristics of the output signal converters PTC; MPC and PDTK:
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Manometric feature of quartz resonators is the reproducibility of temperature-frequency characteristic (PMx), which must be compensated with high accuracy over a wide temperature range and in the range of operating pressures. You must take into account the change in the temperature sensitivity of the cavity of the pressure acting on it. The following describes two methods of temperature compensation.
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In Fig. 2 is a graph of the test results quartz pressure transducer with mathematical temperature compensated readings of temperature-sensitive resonator, which is located in the transmitter housing. The test was conducted in the Company "SKTB ELPA" December 12, 2007.
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Public safety and preservation of complex industrial infrastructure along the coast and the ocean shelf, as well as reducing the risk of adverse impacts on the marine environment in emergency situations on offshore oil platforms, closely related to the study of nonlinear dynamics of waves in the coastal zone. The experimental data are thus of great value in relation to the increasing demands for precision estimates of mean and extreme values of various parameters of hydro and the need for verification and refinement of mathematical models of wave processes. A collaboration of research teams of "Applied Mathematics" Nizhny Novgorod State Technical University (NSTU) and the Laboratory of wave dynamics and coastal currents of the Institute of Marine Geology and Geophysics (IMGG), Far East Branch, subject to many years of experience studying the nonlinear wave dynamics and conduct field experiments in the Pacific [1 - 5, 7 - 12, 14 - 17], it was decided to conduct a joint experiment, the purpose of which relate to the study of wave dynamics of the shelf area in general and, in particular, marine hazards on the shelf, the analysis of low-frequency (with periods ranging from minutes to hours ) sea-level fluctuations, registration processes due to topographical capture wave energy. In addition, the full-scale data obtained will be used for development and testing of a deterministic forecast model of nonlinear boundary waves.
Пьезоэлектрические кварцевые резонаторы и их применение в датчиках
Пьезоэлектрический резонатор представляет собой электромеханическую систему, в которой используется явление прямого и обратного пьезоэффекта, которая обычно выполнена в виде двухполюсника, объединяющего системы электрического возбуждения механических колебаний и съема электрического сигнала, пропорционально их амплитуде. В виду целого ряда свойств одним из самых распространенных пьезоэлектриков, применяемых в пьезоэлектрических резонаторах, является пьезокварц. Кварцевые резонаторы имеют высокую добротность 107 и более, кратковременную и долговременную стабильность 10-4 до 10-7 , практически отсутствует гистерезис при механических, температурных и электрических воздействиях.
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Quartz crystals are widely used in today's electronic equipment, generators and stable frequency filters. But quartz relevant sections and structures are also used to measure various physical parameters such as temperature, pressure, humidity, acceleration. [1,2] For example, pressure sensors. In precision barometer, a precise gauge of absolute pressure in downhole pressure sensors from companies such as Druck (UK), Quartzdyne (USA), Spartek Systems (Canada), Schlumberger (France), Ltd. "SKTB ELPA" (Russia) apply piezoresonance sensors (PCHE).
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Analyzing the current situation on the market of sensitive elements (SE) of the pressure sensors, the following basic principles of their action: piezoresistive, capacitive, piezoelectric and piezoresonance).
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A crystal oscillator is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a very precise frequency. This frequency is commonly used to keep track of time (as in quartz wristwatches), to provide a stable clock signal for digital integrated circuits, and to stabilize frequencies for radio transmitters and receivers. The most common type of piezoelectric resonator used is the quartz crystal, so oscillator circuits incorporating them became known as crystal oscillators, but other piezoelectric materials including polycrystalline ceramics are used in similar circuits.
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EPKV-10M is glued with epoxy glue to one side of the electrode on clean and fat-free surface, the central part of the area shall be free (see drawing). After the glue has dried to the pads of the piezoelectric element, if necessary, two wires are soldered.
Silochuvstvitelnaya characteristic EBL-10M in the free state is practically linear. If the element is glued, the nonlinearity silochuvstvitelnoy characteristics must be determined individually.
In siloperedayuschem device trade weights used differential, ie working couple silochuvstvitelnyh piezo EPKV-10M.
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Sensitive elements in quartz temperature transmitters are temperature-sensitive quartz resonators and transducers pressure - Manometric quartz resonators.
Calibration characteristic resonators described polynomial of second or third degree (approximation error of no more than 0.05% and 0.02%, respectively). F (P) = f O + A 1 * P + A 2 * P 2 + A * P 3 3
To compensate for the temperature error of temperature and frequency response is described as a polynomial of second or third degree (see example in Fig. Below).
This device allows you to measure the temperature with an accuracy of 0.01 degrees Celsius and is essentially a high-precision temperature measurement precision. Temperature sensor in the thermometer is thermo-sensitive crystal type RКТ206.