Most Huode has developed a small-scale and low-cos

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Germany has developed a small-size, low-cost gas mass spectrometer

microelectronic technology research institute IHP leibnizinstitute and German Aerospace Research Center (DLR), and jointly developed a small-size, cost-effective gas mass spectrometry (gasspectroscopy) sensing system, which operates at 245ghz frequency; The system is also the first system in the world that uses silicon germanium (SiGe) chips to make transmitters and receivers. IHP Leibniz said that the agency has developed a cost-effective method to manufacture the required SiGe semiconductor components - that is, the transmitter and receiver chips of the antenna are integrated, and the operating frequency is 238ghz~252ghz; Because those components adopt standard silicon process technology and can utilize existing semiconductor equipment, they can reduce production costs and establish a hitherto unattainable low-cost technical foundation for gas sensors

the newly developed gas sensor has huge application potential, including the detection of toxic gases, or the chemical process control in the semiconductor industry; In addition, this kind of sensor can also be used in the field of medical care, for example, by analyzing the breath of patients to help detect lung diseases

ihp Leibniz develops a small-scale, low-cost gas mass spectrometry analysis system

millimeterabsorptionspectroscopy technology is a technology that already exists in the laboratory, which is applied in the fields of molecular spectroscopy and radio astronomy to determine the concentration of molecules; Traditionally, the RF emission sources used in this technology - Schottky diodes and downstreamfrequencymultipliers - are very expensive and bulky. Although some commercial millimeter wave frequency multipliers can be used as RF emission sources in recent years, they are also small in size, but the price is still relatively high

recently, an American research team has also developed a gas mass spectrometry analysis system with an operating frequency of 210~270ghz, using commercial millimeter wave components; However, the price of such systems still depends on millimeter wave components with high production costs. The ideal solution is to use chips produced by mature SiGe or CMOS processes, so as to greatly reduce the system cost

in addition to the above-mentioned cases of sheet metal damage, the SiGe receiver and transmitter chip prototype developed by IHP Leibniz researchers in the process of transportation supports 238~252ghz operating frequency. Although the range is narrow, the researchers emphasize that this is only the prototype chip, and there will be a version with better performance next. The full-automatic impact testing machine is used to measure the impact resistance of metal materials under normal temperature or low temperature dynamic load. The system displayed by the mechanism uses an opticalbench to carry the transmitting and receiving modules, and the effective antenna gain is amplified through a lens; During gas mass spectrometry measurement, a gas absorption unit (gasabs) with a size of about 0.6m, which is an orptioncell with the capacity of many modern automatic sorting devices, will be placed between the transmitter and the receiver

The IF signal of the receiver will be recorded as a function of the transmission frequency using general commercial laboratory measurement technology; Researchers have integrated local oscillators in both transmitter and receiver, whose frequency is stabilized by external PLL circuit. Two PLL units use two reference frequencies with constant offset. 6) put the brush on the push rod, which can establish a constant if frequency for the receiver after a complete scan. Therefore, very small amplitude changes can be detected as the result of gas absorption analysis

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