Topic
Crystal oven
About: Crystal oven is a research topic. Over the lifetime, 955 publications have been published within this topic receiving 10380 citations. The topic is also known as: oven-controlled crystal oscillator & OCXO.
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01 Feb 1968
TL;DR: In this paper, three fluid relaxation oscillators using R-C-R feedback loops were tested to establish the feedback resistances required to make the oscillator frequency insensitive to temperature and pressure.
Abstract: : Three fluid relaxation oscillators using R-C-R feedback loops were tested to establish the feedback resistances required to make the oscillator frequency insensitive to temperature and pressure. The frequency of the three oscillators, geometrically similar but with different feedback resistances, was measured as a function of stagnation pressure and temperature. With modifications guided by these data, one of the oscillators showed frequency variations of less than 2 percent with changes in input pressure of 6 to 30 psig and changes in temperature of 75 to 200F. A theoretical analysis indicates that an oscillator frequency simultaneously insensitive to temperature and pressure can be achieved using a lumped R-C-R network in the feedback loop.
1 citations
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14 Aug 1963
TL;DR: In this paper, an automatic temperature control system for a crystal oven is described, where a switch responsive to the temperature within the oven controls the electrical supply to thermoelectric junctions inside and outside the oven so that the oven is heated and cooled as necessary to maintain the temperature constant.
Abstract: 934,191 Automatic temperature control MINNESOTA MINING & MANUFACTURING CO June 3, 1960, No 19783/60 Class 38 (4) [Also in Group XIII] In an automatic temperature control system for a crystal oven, a switch responsive to the temperature within the oven controls the electrical supply to thermoelectric junctions inside and outside the oven so that the oven is heated and/or cooled as necessary to maintain the temperature constant In Fig 1 a piezo - electric crystal 22 is mounted between electrodes 24, 26 loaded by a spring 28 within an insulating chamber 12 having a cap 14 A bimetallic strip 68 responsive to the temperature within the chamber adjusts the position of a contact 70 so that if the temperature within the chamber rises above a value determined by the setting of a contact 72 a circuit is completed to pass current from a DC source 80, 82 through dissimilar semi-metallic elements P, N in such a direction that heat is absorbed by the thermo-electric junctions within the chamber and exhausted by the junctions outside the chamber The temperature within the chamber is thus maintained constant at a value below the ambient temperature so that the frequency of a valve oscillator 86 associated with the crystal is constant Suitable materials for the thermoelectric junction elements are described In a modification, Fig 3 (not shown), bimetallic strip 68 controls a two-way switch so that current is passed in one or other direction through the thermo-electric junctions to heat or cool the chamber as necessary to maintain its temperature at a value below, at, or above ambient temperature
1 citations
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20 Nov 2012
TL;DR: In this article, an Oven Controlled Crystal Oscillator (OCO) is described, which consists of a thermostatic bath, a heating device, a PCB and a signal generating element.
Abstract: The present invention discloses an Oven Controlled Crystal Oscillator and a manufacturing method thereof. The Oven Controlled Crystal Oscillator comprises a thermostatic bath, a heating device, a PCB and a signal generating element, where the signal generating element is used for generating a signal of a certain frequency, the heating device, the PCB and the signal generating element are mounted in the thermostatic bath, the signal generating element is mounted in a groove formed on one side of the PCB, while the heating device is mounted against the other side of the PCB that is opposite to the groove. The signal generating element may be a passive crystal resonator or an active crystal oscillator. The Oven Controlled Crystal Oscillator according to the invention is advantageous for a small volume and a high temperature control precision.
1 citations
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01 Nov 2009
TL;DR: In this article, the authors developed a load sensor that uses an AT-cut quartz crystal resonator whose resonance frequency changes under external load, and features high sensitivity, high-speed response, and a wide measurement range.
Abstract: A compact load sensor we developed uses an AT-cut quartz crystal resonator whose resonance frequency changes under external load, and features high sensitivity, high-speed response, and a wide measurement range. Also it has the superior feature in the temperature and frequency stability. In the past, the quartz crystal resonator had been hardly applied to the load measurement because of low degree of mechanical characteristic, that is, it is weak to stress concentration by bending. We have developed and characterized a sensor mechanism that safely maintains the quartz crystal resonator. The objective of this study is to improve the resolution of load measurement and to miniaturize the sensor. We designed a novel retention mechanism of the quartz crystal resonator which is fixed vertical to the applied load. The new load sensor was evaluated on the relation between load and resonance frequency as well as temperature and resonance frequency.
1 citations
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TL;DR: In this paper, an account of work carried out by the Radio Section of the Post Office between 1925 and 1934 in the development of the use of quartz crystal oscillators in a number of different applications, of which the most important was the control of the carrier frequency of shortwave transmitters used for overseas radio services.
Abstract: This paper gives an account of work carried out by the Radio Section of the Post Office between 1925 and 1934 in the development of the use of quartz crystal oscillators in a number of different applications, of which the most important was the control of the carrier frequency of shortwave transmitters used for overseas radio services. The paper is divided into an introduction and five parts treating respectively with the crystal plate (including tourmaline and special applications involving the use of the crystal plate as resonator), the crystal holder, the oscillator circuit, the temperature control of the crystal, and results obtained in service. The importance of apparatus capable of precise frequency measurement, both in the development work and the maintenance of a high grade of service from the constant-frequency point of view, is emphasized.
1 citations