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Detection system for improving stability of high sensitivity terahertz mixer and detection method

A detection system and mixer technology, which is applied in the field of signal detection, can solve problems such as the deterioration of the temperature resolution of the mixer, the instability of the working point of the mixer, and the influence of the performance of the mixer, and achieve the goal of improving the temperature resolution. Effect

Inactive Publication Date: 2012-01-18
NANJING UNIV
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Problems solved by technology

[0010] Previous studies focused on reducing the noise temperature of high-sensitivity terahertz mixers, thereby improving temperature resolution, but did not take into account the instability of local oscillator signal power, and other related factors that make the operating point of the mixer Instability, which affects the performance of the mixer, making the temperature resolution of the mixer worse

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  • Detection system for improving stability of high sensitivity terahertz mixer and detection method
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  • Detection system for improving stability of high sensitivity terahertz mixer and detection method

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Embodiment Construction

[0028] Below in conjunction with the accompanying drawings and specific embodiments, the present invention will be further clarified. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. Modifications of equivalent forms all fall within the scope defined by the appended claims of this application.

[0029] Taking the HEB mixer as an example, the specific measurement process is described. like figure 2As shown, the local oscillator signal in the terahertz frequency band reflected by the beam splitter and the 300K load signal transmitted by the beam splitter (that is, the desired signal in the claims) pass through the low-temperature liquid helium Dewar (that is, the low-temperature Duwar in the claims). Tile) Dewar window on the outer wall into the Dewar interior. The Dewar is a metal shell, and the electromagnetic wave signal can only be irradiated into the Dewar through a windo...

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Abstract

The invention discloses a detection system for improving the stability of a high sensitivity terahertz mixer, which comprises a terahertz frequency band local oscillator signal source, a beam splitter, a silicon lens, a mixer, a coaxial three-way joint, a direct current blocker, an isolator, a low-temperature low-noise amplifier, a normal temperature intermediate-frequency amplifier, a band-pass filter, a device for converting an intermediate frequency power into a direct current voltage, a computer, a direct current bias power supply, a bias deice, a microwave source and a low temperature dewar. The invention also discloses a detection method for improving the stability of the high sensitivity terahertz mixer. In the invention, a feedback circuit is used to control a microwave power further lower than a terahertz power so as to compensate the instability of a terahertz local oscillator power; and by taking the HEB (Hot Electron Bolometer) mixer as an example, the Allen time of the mixer is prolonged to about 10 seconds from about 1 second and the temperature resolution is improved by 30 percent.

Description

technical field [0001] The invention belongs to the field of signal detection, and in particular relates to a detection system and a detection method for improving the stability of a high-sensitivity terahertz mixer. Background technique [0002] THz wave refers to the electromagnetic wave with frequency in the range of 0.1-10THz and wavelength in the range of 3000-30μm. Its frequency band is between microwave and visible light, coincides with millimeter wave in long waveband, and coincides with infrared light in short waveband. The THz frequency band has very important academic and application value. First of all, the THz spectrum of substances contains rich physical and chemical information, such as the vibrational and rotational spectra of molecules, especially the vibrational spectra of macromolecules, which have many characteristic peaks in the THz band. Studying the spectral properties of materials in this band is important for exploring substances. structure is impo...

Claims

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Application Information

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IPC IPC(8): G01N21/25G01N22/00
Inventor 姜奕陈健康琳许伟伟吴培亨
Owner NANJING UNIV
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