CN104864964A - Infrared detector signal modulation and narrow band filter system and realization method - Google Patents
Infrared detector signal modulation and narrow band filter system and realization method Download PDFInfo
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- CN104864964A CN104864964A CN201510296021.7A CN201510296021A CN104864964A CN 104864964 A CN104864964 A CN 104864964A CN 201510296021 A CN201510296021 A CN 201510296021A CN 104864964 A CN104864964 A CN 104864964A
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Abstract
The invention discloses an infrared detector signal modulation and narrow band filter system and a realization method. The system comprises a sinusoidal signal generator, an analog multiplier and a bandpass filter. Output of the sinusoidal signal generator in the system is connected with input of the analog multiplier, and output of the analog multiplier is connected with input of the bandpass filter. The infrared detector signal modulation and narrow band filter system and the realization method have the advantages that amplitude information of signals outputted by the infrared detector can be obtained, noise is reduced greatly, and the signal to noise ratio of the infrared system is thus improved.
Description
Technical field
The invention belongs to the signal processing technology of infrared system, specifically refer to a kind of infrared eye signal madulation and narrow-band filtering system and implementation method, be mainly used in reducing infrared system noise to improve system signal noise ratio, can be applicable to infrared early warning, infrared point target detection etc. and higher occasion is required to system to-noise ratio.
Background technology
In recent years, along with the fast development of infrared technique, its application is also increasingly extensive, penetrate into every field that is military and national economy, as infrared reconnaissance, infrared track guidance, infrared early warning, environmental monitoring, resource exploration, engineering construction etc., serve great effect for promoting economic construction, social progress, the improvement of environment and national defense construction.
But infrared system is faced with the low problem of signal to noise ratio (S/N ratio), especially LONG WAVE INFRARED, and this seriously governs the development and application of infrared technique always, its main cause embodies in the following areas:
That echo signal is faint on the one hand, especially LONG WAVE INFRARED.When sun altitude is 45 °, the solar irradiance of the long wave infrared region that ground scenery receives is about 2 ‰ of visible light wave range.The information spinner that LONG WAVE INFRARED instrument receives will from self radiation of object scene, is that it receives 160 times of solar irradiance.Be converted in a spectrum sample interval, the incident solar irradiance of LONG WAVE INFRARED instrument (spectrum sample interval 50nm) is only 1/4 of visible ray instrument (spectrum sample interval 5nm).
Be thermal background emission and system noise restriction on the other hand, all objects higher than absolute zero all can have heat radiation, and therefore ray machine inside surface is all thermal background emission source.During normal temperature 300K, self heat radiation of optical-mechanical system to the interference especially severe of signal, among the heat radiation background that may be submerged in optical-mechanical system after the radiation signal light splitting from distant place scenery.Meanwhile, it is also very serious that the detector in infrared system reads noise, dark current noise, acquisition of information circuit noise etc.
The low noise technology of infrared focal plane device, as an important research direction in infrared technique, receives and pays close attention to widely.Existing many people expand research work to it, and achieve some achievements.
Be in the application of CN202553902U at publication number, disclose a kind of information acquisition circuit of infrared eye.This utility model is made up of information reading module, Nonuniformity Correction module, image filtering module and flush bonding processor module, and it focuses on utilizing digital signal processing method to carry out infrared image filtering, thus reduces picture noise, improves picture quality.
This utility model has certain limitation in the effect of noise reduction and the real-time of signal transacting, for this problem, the present invention brings out from the simulation signal generator that infrared eye exports and sends out, analogue technique is utilized to realize process in real time and significantly reduce noise, this invention is different from traditional low-pass filtering technique, but signal modulation technique is combined with band-pass filtering, reach better noise reduction while keeping infrared signal information.
Summary of the invention
The object of this invention is to provide a kind of infrared eye signal madulation and narrow-band filtering system and implementation method, significantly can reduce infrared system noise to improve signal to noise ratio (S/N ratio), for the signal processing method of infrared system provides important references.
Infrared eye output signal is similar to standard block, just amplitude is in change, for this signal characteristic, the present invention uses the sinusoidal signal with frequency homophase to be multiplied with it, complete the amplitude sampling of infrared eye output signal, thus produce a kind of modulation signal, this modulation signal is carried out to the bandpass filtering of arrowband, significantly can reduce system noise.Traditional infrared signal process uses low-pass filtering method, and remove high frequency noise, system noise is as shown in (1) hatched area in Fig. 1; This method carries out bandpass filtering to the signal after modulation, and system noise shown in hatched area, can find that noise reduction of the present invention is remarkable as Suo Shi (2) in Fig. 1; Method step as shown in Figure 2; System's composition as shown in Figure 3.
A kind of infrared eye signal madulation and narrow-band filtering system, comprise sinusoidal signal generator, analog multiplier and bandpass filter, it is characterized in that: the signal frequency that sinusoidal signal generator produces is not less than 1MHz and signal peak peak value is not less than 2V; Analog multiplier-three dB bandwidth is not less than 50MHz and Time Created is no more than 30ns; Bandpass filter-three dB bandwidth is not less than 100MHz and slew rate is not less than 1000V/ μ s.
In system: sinusoidal signal generator exports the input being connected to analog multiplier, the input of the output connecting band bandpass filter of analog multiplier.
The implementation method step of infrared eye signal madulation and narrow-band filtering is as follows:
(1) offset of sinusoidal signal generator carries out hardware configuration, according to output frequency-resistance capacitance reduction formula that production firm provides, calculates and outputs signal with resistance capacitance value frequently with infrared eye;
(2) make the sinusoidal signal of generation output signal synchronous with infrared eye by the output synchronizing signal of sinusoidal signal generator, keep identical phase place;
(3) sinusoidal signal in step (2) and infrared eye are outputed signal input analog multiplier simultaneously and carry out multiplying, to obtain modulation signal;
(4) with infrared eye output signal frequency for filter center frequency, bandpass filter is configured, chooses pass band width;
(5) by the bandwidth-limited circuit in the modulation signal input step (4) of acquisition in step (3), narrow-band filtering is carried out.
The present invention has following advantage:
1. circuit structure of the present invention is simple, easily realizes.
2. the present invention reduces Be very effective to system noise.
Accompanying drawing explanation
Fig. 1 is that infrared eye signal madulation and narrow-band filtering method reduce noise schematic diagram, and wherein: figure (1) is the system noise of low-pass filtering, figure (2) is the system noise of bandpass filtering.
Fig. 2 is infrared eye signal madulation and narrow-band filtering method step figure.
Fig. 3 is infrared eye signal madulation and narrow-band filtering System's composition figure.
Embodiment
Infrared eye uses the MARS K508 of Sofradir company, detector output signal frequency is 4MHz, sinusoidal signal generator adopts the MAX038 of MAXIM company, and analog multiplier adopts the AD835 of ADI company, and wave filter amplifier adopts the ADA4857 of ADI company.
(1) offset of sinusoidal signal generator MAX038 carries out hardware configuration, according to output frequency-resistance capacitance reduction formula F (MHz)=5/ (R × C) that production firm provides, 2.5/R=100 μ A, calculate and output signal with resistance capacitance value R=25K Ω frequently, C=50pF with infrared eye;
(2) make the sinusoidal signal of generation output signal synchronous with infrared eye by the output synchronizing signal SYNC of sinusoidal signal generator MAX038, keep identical phase place;
(3) sinusoidal signal in step (2) and infrared eye are outputed signal input analog multiplier AD835 simultaneously and carry out multiplying, to obtain modulation signal;
(4) with infrared eye output signal frequency 4MHz for filter center frequency, bandpass filter is configured, chooses pass band width 2MHz;
(5) by the bandwidth-limited circuit in the modulation signal input step (4) of acquisition in step (3), narrow-band filtering is carried out.
Claims (2)
1. infrared eye signal madulation and a narrow-band filtering system, comprises sinusoidal signal generator, analog multiplier and bandpass filter, it is characterized in that:
The signal frequency that described sinusoidal signal generator produces is not less than 1MHz and signal peak peak value is not less than 2V; Described analog multiplier-three dB bandwidth is not less than 50MHz and Time Created is no more than 30ns; Described bandpass filter-three dB bandwidth is not less than 100MHz and slew rate is not less than 1000V/ μ s;
In system: sinusoidal signal generator exports the input being connected to analog multiplier, the input of the output connecting band bandpass filter of analog multiplier.
2. realize an a kind of method for infrared eye signal madulation and narrow-band filtering system as claimed in claim 1, it is characterized in that comprising the following steps:
(1) offset of sinusoidal signal generator carries out hardware configuration, according to output frequency-resistance capacitance reduction formula that production firm provides, calculates and outputs signal with resistance capacitance value frequently with infrared eye;
(2) make the sinusoidal signal of generation output signal synchronous with infrared eye by the output synchronizing signal of sinusoidal signal generator, keep identical phase place;
(3) sinusoidal signal in step (2) and infrared eye are outputed signal input analog multiplier simultaneously and carry out multiplying, to obtain modulation signal;
(4) with infrared eye output signal frequency for filter center frequency, bandpass filter is configured, chooses pass band width;
(5) by the bandwidth-limited circuit in the modulation signal input step (4) of acquisition in step (3), narrow-band filtering is carried out.
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Citations (6)
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US5721783A (en) * | 1995-06-07 | 1998-02-24 | Anderson; James C. | Hearing aid with wireless remote processor |
CN1556372A (en) * | 2003-12-31 | 2004-12-22 | 中山大学 | Optical film plating near infrared film thickness monitoring instrument |
CN102564997A (en) * | 2012-01-17 | 2012-07-11 | 南京理工大学 | Domestic near-infrared detection device for food quality |
CN103604500A (en) * | 2013-11-30 | 2014-02-26 | 吉林大学 | Detection system and detection method for raster scanning type spectrograph |
CN104180902A (en) * | 2014-08-15 | 2014-12-03 | 中国科学院上海技术物理研究所 | Variable gain control system for improving working efficiency of staring infrared spectrometer and method thereof |
CN204679169U (en) * | 2015-06-02 | 2015-09-30 | 中国科学院上海技术物理研究所 | A kind of infrared eye signal madulation and narrow-band filtering system |
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- 2015-06-02 CN CN201510296021.7A patent/CN104864964A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5721783A (en) * | 1995-06-07 | 1998-02-24 | Anderson; James C. | Hearing aid with wireless remote processor |
CN1556372A (en) * | 2003-12-31 | 2004-12-22 | 中山大学 | Optical film plating near infrared film thickness monitoring instrument |
CN102564997A (en) * | 2012-01-17 | 2012-07-11 | 南京理工大学 | Domestic near-infrared detection device for food quality |
CN103604500A (en) * | 2013-11-30 | 2014-02-26 | 吉林大学 | Detection system and detection method for raster scanning type spectrograph |
CN104180902A (en) * | 2014-08-15 | 2014-12-03 | 中国科学院上海技术物理研究所 | Variable gain control system for improving working efficiency of staring infrared spectrometer and method thereof |
CN204679169U (en) * | 2015-06-02 | 2015-09-30 | 中国科学院上海技术物理研究所 | A kind of infrared eye signal madulation and narrow-band filtering system |
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Application publication date: 20150826 |