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 PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
signal
infrared eye
analog multiplier
infrared
sinusoidal signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510296021.7A
Other languages
Chinese (zh)
Inventor
刘银年
陈凯
孙德新
柴孟阳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Institute of Technical Physics of CAS
Original Assignee
Shanghai Institute of Technical Physics of CAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Institute of Technical Physics of CAS filed Critical Shanghai Institute of Technical Physics of CAS
Priority to CN201510296021.7A priority Critical patent/CN104864964A/en
Publication of CN104864964A publication Critical patent/CN104864964A/en
Pending legal-status Critical Current

Links

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

A kind of infrared eye signal madulation and narrow-band filtering system and implementation method
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.
CN201510296021.7A 2015-06-02 2015-06-02 Infrared detector signal modulation and narrow band filter system and realization method Pending CN104864964A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510296021.7A CN104864964A (en) 2015-06-02 2015-06-02 Infrared detector signal modulation and narrow band filter system and realization method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510296021.7A CN104864964A (en) 2015-06-02 2015-06-02 Infrared detector signal modulation and narrow band filter system and realization method

Publications (1)

Publication Number Publication Date
CN104864964A true CN104864964A (en) 2015-08-26

Family

ID=53910953

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510296021.7A Pending CN104864964A (en) 2015-06-02 2015-06-02 Infrared detector signal modulation and narrow band filter system and realization method

Country Status (1)

Country Link
CN (1) CN104864964A (en)

Citations (6)

* Cited by examiner, † Cited by third party
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

Patent Citations (6)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
CN108983234B (en) Terahertz ISAR imaging system and image reconstruction method based on back projection
CN105425244B (en) The chirped modulation photon counting laser radar of preposition mixing
CN109214371B (en) Sinusoidal signal filtering system based on fast Fourier transform
US20210248719A1 (en) Image processing device and image processing method
CN105467377A (en) Three-dimensional imaging radar read-out circuit based on self-mixing detector
CN109375201A (en) Microwave photon radar detection implementation method integrated with frequency measurement and device
CN204679169U (en) A kind of infrared eye signal madulation and narrow-band filtering system
CN108844628B (en) Multispectral imaging detection system
CN106371090A (en) Microwave and laser integrated composite radar
CN203396947U (en) Echo data collecting system used for X-band wave observation radar
CN105929380B (en) A kind of laser satellite altimeter Full wave shape laser radar data denoising method
CN104864964A (en) Infrared detector signal modulation and narrow band filter system and realization method
CN113298836B (en) Remote sensing image thin cloud removing method and system considering element contour intensity
CN108549063A (en) Target Movement Track is to speed method for quick estimating in a kind of satellite-borne synthetic aperture radar image
CN108983167A (en) Radar universal description modeling method and device
US8686766B2 (en) Read out integrated circuit
CN204442567U (en) A kind of digital picture real-time display system based on industrial computer platform
US7180537B2 (en) Relative channel delay measurement
CN106895861B (en) A kind of fiber optic high-resolution optical grating reflection spectrum acquisition method based on multiple A/D module samples
CN105099461A (en) Multi-band signal quadrature compressive sampling method and system
CN104833426A (en) Scene adaptive infrared focal plane imaging system gray scale super-resolution method
CN113238244B (en) FMCW laser ranging beat signal frequency estimation method and system
CN116993957A (en) Camera system and method for capturing tracking modulated beacon light
Pan et al. DC offset and low frequency noise compensation for direct-conversion receiver in pulse compression radar
CN104143970B (en) A kind of for surveying the accumulation detection method of weak signal aperiodic

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
EXSB Decision made by sipo to initiate substantive examination
SE01 Entry into force of request for substantive examination
WD01 Invention patent application deemed withdrawn after publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20150826