A Dielectric Constant Measuring Device Based on Differential Oscillator
A dielectric constant and measuring device technology, which is applied in the field of dielectric constant measuring devices based on differential oscillators, can solve problems such as difficult portability, miniaturization, and common-mode interference, and achieve portability and suppress common-mode interference , to achieve the effect of miniaturization
Active Publication Date: 2021-12-07
LANSUS TECH INC
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Problems solved by technology
[0006] However, the above-mentioned measurement device is susceptible to interference from environmental factors. The MOS tube in the oscillator is an active device, and its bias circuit is sensitive to environmental interference, such as indoor temperature, humidity and other factors, which easily cause common-mode interference; and, Although a VNA is avoided, a spectrum analyzer is required, making it difficult to achieve portability and miniaturization
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[0029] Referring to the drawings, wherein like reference numerals represent like components, the principles of the present invention are exemplified when implemented in a suitable computing environment. The following description is based on illustrated specific embodiments of the invention, which should not be construed as limiting other specific embodiments of the invention not described in detail herein.
[0030] refer to figure 1 In the dielectric constant measurement device 100 based on a differential oscillator provided by the embodiment of the present invention, the dielectric constant measurement device 100 includes a differential oscillator 11 for outputting two differential oscillation signals, and the differential oscillator 11 The detection branch 12 and the reference branch 13 , the mixer 14 and the voltage measurement mechanism 15 are connected to the two output ends of the circuit.
[0031] Wherein, the detection branch 12 includes a first DC blocking capacitor...
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The embodiment of the present invention discloses a dielectric constant measuring device based on a differential oscillator, which includes a differential oscillator for outputting two differential oscillation signals, and detection branches respectively connected to the two output terminals of the differential oscillator and a reference branch, a mixer, and a voltage measurement mechanism; one path of the differential oscillation signal is transmitted to the mixer after passing through the first DC blocking capacitor, the first phase shifting unit and the first sensitive element in the detection branch in sequence One input terminal of the frequency converter, and the other differential oscillation signal is transmitted to the other of the mixer after passing through the second DC blocking capacitor, the second phase shifting unit and the second sensitive element in the reference branch in sequence Input terminal; the first sensitive element and the second sensitive element have the same structure, and the voltage measuring mechanism is connected to the output end of the mixer. Through the above method, the present invention can suppress the common mode caused by effective environmental factors interference, and is conducive to portability and miniaturization.
Description
technical field [0001] The invention relates to the technical field of dielectric constant measurement, in particular to a dielectric constant measurement device based on a differential oscillator. Background technique [0002] High-precision dielectric constant measurement system is widely used in agriculture, industry, medical treatment and other fields. For example, in the field of agriculture, the maturity of crops can be analyzed by analyzing the difference in the dielectric constant of seeds by taking advantage of the large dielectric constant of water; in the medical field, the detection of cancer cells can be realized by analyzing the dielectric constant of cells; In the field of industrial production, by analyzing the dielectric constant of the process object, its chemical composition can be analyzed to improve production efficiency. [0003] Common measurement methods include transmission line method, resonant cavity method, free space method, etc., but these meas...
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IPC IPC(8): G01R27/26H03B5/04H03B5/12
CPCG01R27/2688H03B5/04H03B5/1206
Inventor 史哲张莽石昊云郭嘉帅
Owner LANSUS TECH INC