Separate wavelength rapid selection serial control system
A wavelength selection and rapid selection technology, applied in the field of spectroscopic instruments, can solve the problem of asynchrony between the measurement signal and the detection wavelength, and achieve the effect of rapid selection and improvement of the acquisition rate.
Inactive Publication Date: 2010-06-02
CENT FOR SPACE SCI & APPLIED RES
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Problems solved by technology
[0003] Therefore, the purpose of the present invention is to overcome the problem that the measurement signal and the detection wavelength are easily out of sync when performing rapid measurement of the separation wavelength in the prior art, and propose a method that is not affected by the rotation stability of the wavelength selection disc, and the measurement signal and the detection wavelength are long-term Synchronous, stable and reliable wavelength selection disc-sampling pulse-AD acquisition serial control system
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[0022] Such as figure 1 shown. This embodiment includes a driving circuit 1 , a DC brushless motor 2 , a wavelength selection disc 3 , a position sensor 4 , a photodetector 5 and a signal processing unit 6 .
[0023] The drive circuit 1 converts the DC power supply into the three-phase power required to drive the DC brushless motor 2, and supplies the DC brushless motor 2 according to the timing required by the DC brushless motor 2 to drive the DC brushless motor 2 to rotate. The motor 2 is used to drive the rotation of the wavelength selection disk 3 . DC brushless motor 2 is a DC brushless torque motor with a speed of 250rpm.
[0024] The wavelength selection disc 3 is installed on one end of the rotating shaft of the DC brushless motor 2 , and the axis of the wavelength selecting disc 3 coincides with the rotating shaft of the DC brushless motor 2 . The wavelength selection disk 3 is placed behind the exit slit 7 of the spectrometer, close to the exit slit. The structur...
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The invention provides a serial control system for rapid selection of discrete wavelength, which comprises a drive motor, a wavelength selection disk, a position sensor, a photoelectric detector and asignal processing unit, wherein the wavelength selection disk is provided with wavelength selection holes and sampling pulse teeth, the wavelength selection holes are through-holes with certain opening angles and widths, the opening angles of the wavelength selection holes are not overlapped, and the distance between the wavelength selection holes and the rotating shaft of the wavelength selection disk corresponds to the positions in an exit slit array corresponding to different wavelengths; the sampling pulse teeth are positioned at the edge of the wavelength selection disk and one-to-one corresponding to the wavelength selection holes; the position sensor is close to the edge of the wavelength selection disk and used for detecting the sampling pulse teeth; and the position sensor and the photoelectric detector transmit the signal to the signal processing unit. By the invention, the measurement signal and the detection wavelength can be synchronous in a long-term, stable and reliablemanner.
Description
technical field [0001] The invention belongs to the technical field of spectroscopic instruments, in particular, the invention relates to a serial control system for rapid selection of separation wavelengths. Background technique [0002] Differential absorption and wavelength pair measurement methods are important methods in spectroscopy measurements. In order to measure the global distribution of total atmospheric ozone, the United States began to develop the Total Ozone Mapping Spectrometer (TOMS) in the late 1970s using wavelength pair measurement technology. In order to achieve rapid measurement of each detection wavelength, the instrument uses a fixed grating, an array exit slit spectrometer and a wavelength selection disk, and a single photodetector measures the signals of 6 separated wavelengths in time sequence. Here, realizing the accurate synchronization of the measurement signal and the detection wavelength is the key to the success of the whole machine. The cu...
Claims
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IPC IPC(8): G01J3/28
Inventor 王英鉴王咏梅张仲谋管凤君吕建工陈济
Owner CENT FOR SPACE SCI & APPLIED RES