CN108551541B - A kind of imaging system and its imaging method that low cost is highly sensitive - Google Patents
A kind of imaging system and its imaging method that low cost is highly sensitive Download PDFInfo
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- CN108551541B CN108551541B CN201810253144.6A CN201810253144A CN108551541B CN 108551541 B CN108551541 B CN 108551541B CN 201810253144 A CN201810253144 A CN 201810253144A CN 108551541 B CN108551541 B CN 108551541B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/44—Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/268—Signal distribution or switching
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Abstract
The invention discloses a kind of imaging systems and its imaging method that low cost is highly sensitive, wherein method includes: to be radiated at after Laser modulation to predeterminated frequency on subject；The image of subject is imaged on programmable digital micro mirror by object lens optically, and programmable digital micro mirror encodes image；Image light signals after coding reach single pixel sensor by condenser, and the optical signal received is converted to analog signal by single pixel sensor；After sensor module for reading and writing obtains the image information in analog signal by locking phase amplifying device, the image information that will acquire converts and is stored as numerical data；Imaging display module restores according to numerical data and shows image.Laser light source is first modulated by the present invention, then obtains the image information in analog signal, can be with wiping out background noise, to realize the acquisition to slight photo-electric signal, the sensitivity of imaging is greatly improved, and small in size and at low cost, can be widely applied to electronic imaging field.
Description
Technical field
The present invention relates to electronic imaging field more particularly to a kind of imaging systems and its imaging side that low cost is highly sensitive
Method.
Background technique
With the development of CCD/CMOS sensor technology, digital image sensor is widely used in DSLR camera and intelligent hand
The portable mobile apparatus such as machine.High speed camera is even more to be widely used in industrial detection, biomedical high speed micro-imaging, high speed grain
The technical fields such as son imaging, military rocket launching analysis.
Due to being limited by CCD and cmos sensor size, between the resolution ratio of image, image taking speed and hardware cost
Mutually restrict.High resolution sensor requires large scale or small photoelectric sensing unit, however high speed imaging requires larger ruler again
The sensor of very little sensing unit or high sensitivity.At the same time, imaging sensor can be used as distance measurement element, and robot,
It is had broad application prospects in intelligent field, camera can be used to calculate distance, instead of the ultrasound of expensive traditional in people
Wave, laser radar and radar sensor, but the sensitivity that distance tends to rely on camera sensor is calculated using camera, such as
It is measured by structural light three-dimensional, monocular, three-dimensional measurement of binocular vision etc..Because what high sensor camera can be imaged
Distance and speed are both greater than general camera, so either high speed camera or long range three-dimensional measurement camera requires and possess height
The sensor of sensitivity.
The speed of digital camera and sensitivity depend on the sensitivity of sensor, and the high sensitivity low pass of sensor often with
The number of photons that can detect is measured.The type of sensor includes the ICCD of single photon detection, has ten number of photons advantageous
EMCCD, the SCMOS with high-resolution, high speed and high sensitivity, and improve the system of sensitivity by reducing thermal noise
Cold mould CCD.Because ICCD is set up by additional image intensifying realizes that photon amplification and EMCCD have company after its readout register
Continuous a string of gain register, so extremely expensive using the price of the camera of both sensors, and spatial resolution compared with
Low and image taking speed is limited.And SCMOS uses CCD structure for substrate, ins succession respective amplifier and A/D conversion circuit to each column,
Its speed that CMOS may be implemented, but price is still expensive.Refrigeration type CCD realizes highly sensitive phase by additional refrigeration equipment
Machine, thus it is bulky.By above-mentioned analysis it is found that the price of present highly sensitive camera is all more expensive, and camera
Volume it is bigger than normal, be not suitable for generally use.
Explanation of nouns:
CS:Compressive Sensing looks like for compressed sensing.
DMD:Digital Micro Device, looks like for digital micro-mirror.
DLSR:Digital Single Lens Reflex looks like for digital single lens reflex, is commonly called as single-lens reflex camera.
CCD:Charge Coupled Device, looks like for charge-coupled device.
EMCCD:Electron-Multiplying Charge Coupled Device, looks like for electron multiplication CCD.
ICCD:Intensified Charge Coupled Device looks like to enhance charge-coupled device.
CMOS:Complementary Metal Oxide Semiconductor, looks like and partly leads for complementary metal oxide
Body, a kind of voltage-controlled amplifying device.
SCMOS:Scientific Complementary Metal Oxide Semiconductor, looks like for scientific research grade
CMOS。
PSD:Phase Sensitive Detection looks like for phase sensitive detecting.
LPF:Low Pass Filter, looks like for low-pass filter.
Summary of the invention
In order to solve the above-mentioned technical problem, the object of the present invention is to provide a kind of low cost and with highly sensitive imaging
System.
It is a further object of the present invention to provide a kind of low cost and there is highly sensitive imaging system images method.
The technical scheme adopted by the invention is that: a kind of imaging system that low cost is highly sensitive, including laser controller,
Object lens, programmable digital micro mirror, condenser, single pixel sensor, sensor module for reading and writing and imaging display module, the biography
Sensor module for reading and writing is connect with imaging display module, and the sensor module for reading and writing includes locking phase amplifying device, and the locking phase is put
Big device is connect with single pixel sensor；
The laser controller is used for its internal Laser modulation to predeterminated frequency, and laser light source is irradiated to
On subject；
The object lens are for being imaged on programmable digital micro mirror for the image of subject optically；
The programmable digital micro mirror is for encoding the imaging of subject image；
The condenser is used to the image light signals after coding gathering single pixel sensor；
The single pixel sensor is used to receive the optical signal after coding, and converts optical signals to analog signal；
The sensor module for reading and writing is used to obtain the image information in analog signal by locking phase amplifying device, and will obtain
The image information taken converts and is stored as numerical data；
The imaging display module according to numerical data for restoring and showing image.
Further, the locking phase amplifying device includes buffer cell, phase sensitive detecting unit, reference signal unit and filter
Wave device, the single pixel sensor passes sequentially through buffer cell, phase sensitive detecting unit is connect with filter, described with reference to letter
Number unit is connect with phase sensitive detecting unit；
The reference signal unit is used to be arranged according to the modulating frequency of laser light source reference signal frequency, and will be with reference to letter
Number it is delivered to phase sensitive detecting unit；
The phase sensitive detecting unit is used to obtain image letter in conjunction with analog signal, reference signal and phase lock amplifying technology
Breath.
Further, the laser controller includes two to dichronic mirror, the first lens and the second lens；
The laser controller by the light modulation of first wave length in first frequency, by the light modulation of second wave length in the second frequency
Rate；
After the light that the light of the first wave length passes through the first lens and second wave length passes through the second lens, process two is to color separation
Mirror forms coupling light, and will couple in light emission to subject.
Further, the laser controller further includes reflective mirror and the third lens；
The light of the first wave length reaches the first lens after the reflection of reflective mirror, and the coupling light passes through the third lens
After be radiated on subject.
Further, the programmable digital micro mirror is made of multiple controllable micro mirror units, and each micro mirror unit has
Two states, the encoder matrix of the Design of State programmable digital micro mirror by changing micro mirror unit.
It is of the present invention another solution is that a kind of imaging method for the imaging system that low cost is highly sensitive,
The following steps are included:
After Laser modulation to predeterminated frequency, it is radiated on subject；
The image of subject is imaged on programmable digital micro mirror by object lens optically, programmable digital micro mirror pair
Image is encoded；
Image light signals after coding reach single pixel sensor, the light that single pixel sensor will receive by condenser
Signal is converted to analog signal；
After sensor module for reading and writing obtains the image information in analog signal by locking phase amplifying device, the image that will acquire
Information converts and is stored as numerical data；
Imaging display module restores according to numerical data and shows image.
Further, after the sensor module for reading and writing obtains the image information in analog signal by locking phase amplifying device
Step, specifically includes the following steps:
Reference signal frequency is arranged according to the modulating frequency of laser light source in reference signal unit, and reference signal is delivered to
Phase sensitive detecting unit；
Phase sensitive detecting unit combination analog signal, reference signal and phase lock amplifying technology obtain image information；
The Frequency Synchronization of the analog signal and reference signal.
Further, the step of programmable digital micro mirror encodes image includes configuration programmable digital micro mirror
Step, specifically:
A1, programmable digital micro mirror is configured according to preset encoder matrix；
A2, each sensor module for reading and writing acquisition image information after, judge programmable digital micro mirror configured number whether
Reach preset times, if so, restored image；Conversely, return step A1.
Further, described by after Laser modulation to predeterminated frequency, the step being radiated on subject specifically includes
Following steps:
Laser controller by the light modulation of first wave length in first frequency, by the light modulation of second wave length in second frequency；
After the light that the light of first wave length passes through the first lens and second wave length is passed through the second lens, process two is to dichronic mirror
Coupling light is formed, and will be coupled in light emission to subject.
Further, the step of imaging display module restores according to numerical data and shows image, specifically:
Imaging display module combination compressive sensing theory and optimization method carry out operation numerical data, to restore and show figure
Picture.
The beneficial effects of the present invention are: a kind of imaging system that low cost is highly sensitive, including laser controller, object lens,
Programmable digital micro mirror, condenser, single pixel sensor, sensor module for reading and writing and imaging display module, the sensor
Module for reading and writing is connect with imaging display module, and the sensor module for reading and writing includes locking phase amplifying device, the locking phase amplification dress
It sets and is connect with single pixel sensor；The laser controller is used for its internal Laser modulation to predeterminated frequency, and will
Laser light source is irradiated on subject；The object lens are for being imaged on programmable number for the image of subject optically
On word micro mirror；The programmable digital micro mirror is for encoding the imaging of subject image；The condenser is used for will
Image light signals after coding gather single pixel sensor；The single pixel sensor is used to receive the optical signal after coding, and
Convert optical signals to analog signal；The sensor module for reading and writing is used to obtain in analog signal by locking phase amplifying device
Image information, and the image information that will acquire converts and is stored as numerical data；The imaging display module is used for according to number
Data recovery simultaneously shows image.Laser light source is first modulated by this system, then simulation letter is obtained using locking phase amplifying device
Image information in number with wiping out background noise and can realize the acquisition to slight photo-electric signal, to greatly improve into
The sensitivity of picture, and the system bulk is smaller, it is at low cost, it can satisfy the needs of most users.
Another beneficial effect of the present invention is: a kind of imaging method for the imaging system that low cost is highly sensitive, including with
Lower step: it after Laser modulation to predeterminated frequency, is radiated on subject；Object lens are optically by subject
Image is imaged on programmable digital micro mirror, and programmable digital micro mirror encodes image；Image light signals warp after coding
It crosses condenser and reaches single pixel sensor, the optical signal received is converted to analog signal by single pixel sensor；Sensor is read
After writing module obtains the image information in analog signal by locking phase amplifying device, the image information that will acquire is converted and is stored as
Numerical data；Imaging display module restores according to numerical data and shows image.Laser light source is first modulated by this method, then
The image information in analog signal is obtained using locking phase amplifying device, with wiping out background noise and can be realized to faint optical telecommunications
Number acquisition can satisfy most users to greatly improve the sensitivity of imaging, and this method is at low cost
It needs.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram for the imaging system that low cost is highly sensitive of the present invention；
Fig. 2 is the structural block diagram of locking phase amplifying device of the present invention；
Fig. 3 is the structural schematic diagram to form coupling light；
Fig. 4 is the schematic diagram that object is imaged in programmable digital micro mirror；
Fig. 5 is a kind of step flow chart of the imaging method of imaging system that low cost is highly sensitive；
Fig. 6 is that laser light source frequency illustrates schematic diagram.
Specific embodiment
Embodiment one
Referring to Fig.1, a kind of imaging system that low cost is highly sensitive, including laser controller, object lens 5, programmable digital
Micro mirror 7, condenser 9, single pixel sensor 10, sensor module for reading and writing and imaging display module, the sensor read and write mould
Block is connect with imaging display module, and the sensor module for reading and writing includes locking phase amplifying device, the locking phase amplifying device and list
Element sensor 10 connects；
The laser controller is used for its internal modulation of laser light source 3 to predeterminated frequency, and laser light source 3 is irradiated
Onto subject 1；
The object lens 5 are for being imaged on programmable digital micro mirror 7 for the image of subject 1 optically；
The programmable digital micro mirror 7 is for encoding the imaging of 1 image of subject；
The condenser 9 is used to the image light signals after coding gathering single pixel sensor 10；
The single pixel sensor 10 is used to receive the optical signal after coding, and converts optical signals to analog signal；
The sensor module for reading and writing is used to obtain the image information in analog signal by locking phase amplifying device, and will obtain
The image information taken converts and is stored as numerical data；
The imaging display module according to numerical data for restoring and showing image.
Appended drawing reference: 1, subject；3, laser light source；5, object lens；7, programmable digital micro mirror；9, condenser；10, single
Element sensor.
The working principle of above-mentioned imaging system are as follows: laser light source 3 is modulated in a preset frequency by laser controller, institute
The be modulated to machinery modulation or circuit modulation, the preset frequency stated are a high frequency, can be 1KHz or other frequencies.Laser
Light source 3 is radiated on subject 1 after being modulated, and after subject 1 is radiated by laser light source, being imaged on by object lens 5 can be compiled
On journey digital micro-mirror 7, programmable digital micro mirror 7 encodes the imaging of image, and the image after coding is passed through condenser 9
It is shown on single pixel sensor 10.Single pixel sensor 10 converts optical signals to analog signal, and sensor module for reading and writing is logical
The image information in locking phase amplifying device acquisition analog signal is crossed, and the image information that will acquire converts and is stored as digital number
According to imaging display module restores according to numerical data and shows image.Because first laser light source is adjusted in above system
It makes, then obtains the image information in analog signal using locking phase amplifying device, it can be with wiping out background noise, to realize to micro-
The acquisition of dim light electric signal, small-signal can be as small as number and receive volt (nV), or even remain to precise measurement in thousands of times of noise,
So greatly improving the sensitivity of imaging.The image-forming range of object can also be increased considerably, while in dim light situation
Under, especially under dark situations, the sensitivity of image is greatly enhanced.And the system bulk is small, at low cost, greatly meets
The needs of user.
Referring to Fig. 2, it is further used as preferred embodiment, the locking phase amplifying device includes buffer cell, phase spirit
Quick detecting unit, reference signal unit and filter, the single pixel sensor pass sequentially through buffer cell, phase sensitive detecting
Unit is connect with filter, and the reference signal unit is connect with phase sensitive detecting unit；
The reference signal unit is used to be arranged according to the modulating frequency of laser light source reference signal frequency, and will be with reference to letter
Number it is delivered to phase sensitive detecting unit；
The phase sensitive detecting unit is used to obtain image letter in conjunction with analog signal, reference signal and phase lock amplifying technology
Breath.
After the analog electrical signal that the buffer cell inputs single pixel sensor buffers, the sensitive detecting of input phase
Unit, with reference to signal element by the sensitive detecting unit of reference signal input phase, the analog electrical signal and reference signal
Frequency it is identical, and reference signal is identical as the modulation of laser light source, in phase sensitive detecting unit by phase lock amplifying technology,
The signal for the image information that can pass faint.Small-signal can be as small as number and receive volt (nV), or even in thousands of times of noise still
It can precise measurement.Finally the signal of image information is proposed using filter, and is amplified.
Referring to Fig. 3, it is further used as preferred embodiment, the laser controller includes two to dichronic mirror 13, first
Lens 12 and the second lens 15；
The laser controller by the light modulation of first wave length in first frequency, by the light modulation of second wave length in the second frequency
Rate；
After the light that the light of the first wave length passes through the first lens 12 and second wave length passes through the second lens 15, process two to
Dichronic mirror 13 forms coupling light, and will couple in light emission to subject；
The laser controller further includes reflective mirror 11 and the third lens 14；
The light of the first wave length reaches the first lens 12 after the reflection of reflective mirror 11, and the coupling light passes through third
It is radiated on subject after lens 14.
Appended drawing reference: 11, reflective mirror；12, the first lens；13, two to dichronic mirror；14, the third lens；15, the second lens.
First lens 12, the second lens 15 and the third lens 14 are common lens, can penetrate first wave length
The light of light and second wave length.The light of first wave length and the light of second wave length are modulated at different frequencies by laser controller respectively
On, it is described to be modulated to machinery modulation or circuit modulation.It is exported respectively in reference signal unit corresponding with the light of first wave length
Corresponding second reference signal of the light of first reference signal and second wave length, so the system can disposably restore out mostly light
The image of spectrum promotes the function and performance of the system.
Referring to Fig. 4, it is further used as preferred embodiment, the programmable digital micro mirror is by multiple controllable micro mirror lists
Member composition, each micro mirror unit have two states, the volume of the Design of State programmable digital micro mirror by changing micro mirror unit
Code matrix.
Appended drawing reference: 7, programmable digital micro mirror；6, imaging of the subject in programmable digital micro mirror；16, micro mirror list
First (first state)；17, micro mirror unit (the second state).
In the present embodiment, programmable digital micro mirror is the micro electronmechanical space light modulation mould of TI (Texas Instrument) company production
Group.As shown in figure 4, programmable digital micro mirror 7 is made of multiple micro mirror units, imaging of the subject in programmable digital micro mirror
6 are shown on programmable digital micro mirror 7, and each micro mirror unit area is about 10 microns of * 10 microns of sizes, and each micro mirror unit can
It with independent control, and can be effectively controlled in two states, respectively the micro mirror unit 16 of first state and the second state is micro-
Mirror unit 17.Different states indicates that the direction of the deflection of micro mirror unit is different.In the present embodiment, first state represents micro mirror
The state of+12 degree of unit deflection, the state of -12 degree of the second status representative micro mirror unit deflection.By the shape for changing micro mirror unit
State can make a part of optical signal enter condenser, and another part optical signal cannot be introduced into condenser, to realize to image
Coding, and whole process does not still change the frequency of optical signal.By designing the different conditions of each micro mirror unit, can incite somebody to action
The micro mirror of entire plane is designed to an encoder matrix.The image being projected on programmable digital micro mirror is made in different coding matrix
With rear, the image that optically focused camera lens obtains is that the image after spatial domain coding encodes it if target image is X (matrix form)
Image afterwards is matrix Ψ1X is indicated.After m different coding matrix, available m coded image (Ψ1X ... ..., ΨmX).Wherein, the m is the number of encoder matrix.
Laser light source is first modulated by above system, then the image in analog signal is obtained using locking phase amplifying device
Information, can be with wiping out background noise, to realize the acquisition to slight photo-electric signal, small-signal can be as small as several volts of receiving
(nV), precise measurement or even in thousands of times of noise is remained to, so greatly improving the sensitivity of imaging.It can also be substantially
Degree increases the image-forming range of object, while in dim light, especially under dark situations, the sensitivity of image significantly increases
By force.And the system bulk is small, at low cost, greatly meets the needs of user.
Embodiment two
Referring to Fig. 5, a kind of imaging method for the imaging system that low cost is highly sensitive, comprising the following steps:
S1, by after Laser modulation to predeterminated frequency, be radiated on subject.
Wherein, S1 includes step step S11~S12:
S11, laser controller by the light modulation of first wave length in first frequency, by the light modulation of second wave length in the second frequency
Rate.
After S12, the light that the light of first wave length is passed through to the first lens and second wave length pass through the second lens, process two to point
Look mirror forms coupling light, and will couple in light emission to subject.
S2, programmable digital micro mirror is configured according to preset encoder matrix.
The image of subject is imaged on programmable digital micro mirror by S3, object lens optically, and programmable digital is micro-
Mirror encodes image.
Image light signals after S4, coding reach single pixel sensor by condenser, and single pixel sensor will receive
Optical signal be converted to analog signal.
After S5, sensor module for reading and writing obtain the image information in analog signal by locking phase amplifying device, it will acquire
Image information converts and is stored as numerical data.
Wherein, S5 includes step S51~S52:
Reference signal frequency is arranged according to the modulating frequency of laser light source in S51, reference signal unit, and reference signal is defeated
It send to phase sensitive detecting unit.
S52, phase sensitive detecting unit combination analog signal, reference signal and phase lock amplifying technology obtain image information.
The Frequency Synchronization of the analog signal and reference signal.
S6, judge whether the configured number of programmable digital micro mirror reaches preset times, if so, performing the next step；Conversely,
Return step S2.
S7, imaging display module restore according to numerical data and show image.Specifically: imaging display module combines compression
Perception theory and optimization method carry out operation numerical data, to restore and show image.
In the present embodiment, m different encoder matrixs are preset with, therefore need that programmable digital micro mirror match for m times
It sets, after acquiring analog signal, judges whether to have reached m measurement, if so, performing the next step；Conversely, coming back for new
The configuration of one group of programmable digital micro mirror, and sequence executes subsequent process.The image on programmable digital micro mirror is projected in not
After encoder matrix effect, the image that optically focused camera lens obtains is the image after spatial domain coding, if target image is X (matrix
Form), the image after encoding is that matrix Ψ 1X is indicated.Image after m measurement after available m coding
The weighted sum of all pixels.If being indicated with math equation are as follows:
Y=Ψ X
Wherein Ψ=[Ψ1,Ψ2,…,Ψm], X is the matrix form (being converted into one-dimensional vector) of testing image, Y=[y1,
y2..., ym], ymIndicate the value of single pixel sensor measurement in the m times measurement.Finally by compressive sensing theory and optimization method
To solve above-mentioned equation, the matrix solution of available X, the as numerical value for the image of being shot, to realize the recovery of image.
It is described in detail now in conjunction with Fig. 6, the frequency of signal is constant in entire acquisition and imaging process.
Appended drawing reference: 1, subject；5, object lens；7, programmable digital micro mirror；9, condenser；10, single pixel sensor；
18, the laser waveform modulated；19, the photoelectric current waveform on single pixel sensor.
As shown in fig. 6, after the light source modulated is radiated at subject 1, by the diffusing reflection of subject 1, into object
Mirror 5, in this process, the frequency of modulation light do not change.The laser waveform 18 modulated is as shown, by for the first time
It after imaging, is encoded on 7 surface of programmable digital micro mirror, can partially enter condenser 9, another part cannot be introduced into
Condenser 9, to realize the coding of image, but whole process does not still change the frequency of modulation light.Last optically focused is in single pixel
Image on sensor 10 is the scale smaller of target image.If detecting the light of corresponding exciting irradiation wavelength, photoelectric current wave
Shape 19 is as shown in the figure, and the frequency of photoelectric current waveform and the frequency for the laser waveform modulated are the same.In the present invention
The Frequency Synchronization of waveform in the laser waveform and reference signal modulated is passed through into locking phase since ambient noise is white noise
Amplifying technique finally can wiping out background noise to realize the acquisition of faint picture signal improve the sensitivity of acquisition.
Laser light source is first modulated by the above method, then the image in analog signal is obtained using locking phase amplifying device
Information, can be with wiping out background noise, to realize the acquisition to slight photo-electric signal, small-signal can be as small as several volts of receiving
(nV), precise measurement or even in thousands of times of noise is remained to, so greatly improving the sensitivity of imaging.It can also be substantially
Degree increases the image-forming range of object, while in dim light, especially under dark situations, the sensitivity of image significantly increases
By force.And the cost of the imaging method is low, greatly meets the needs of user.
It is to be illustrated to preferable implementation of the invention, but the invention is not limited to the implementation above
Example, those skilled in the art can also make various equivalent variations on the premise of without prejudice to spirit of the invention or replace
It changes, these equivalent deformations or replacement are all included in the scope defined by the claims of the present application.
Claims (10)
1. a kind of imaging system that low cost is highly sensitive, which is characterized in that including laser controller, object lens, programmable digital
Micro mirror, condenser, single pixel sensor, sensor module for reading and writing and imaging display module, the sensor module for reading and writing with
Display module connection is imaged, the sensor module for reading and writing includes locking phase amplifying device, the locking phase amplifying device and single pixel
Sensor connection；
The laser controller is used for its internal Laser modulation to predeterminated frequency, and laser light source is irradiated to shot
On object；
The object lens are for being imaged on programmable digital micro mirror for the image of subject optically；
The programmable digital micro mirror is for encoding the imaging of subject image；
The condenser is used to the image light signals after coding gathering single pixel sensor；
The single pixel sensor is used to receive the optical signal after coding, and converts optical signals to analog signal；
The sensor module for reading and writing is used to obtain the image information in analog signal by locking phase amplifying device, and will acquire
Image information converts and is stored as numerical data；
The imaging display module according to numerical data for restoring and showing image.
2. a kind of highly sensitive imaging system of low cost according to claim 1, which is characterized in that the locking phase amplification
Device includes buffer cell, phase sensitive detecting unit, reference signal unit and filter, and the single pixel sensor successively leads to
Cross buffer cell, phase sensitive detecting unit is connect with filter, the reference signal unit and phase sensitive detecting unit company
It connects；
The reference signal unit is used to that reference signal frequency to be arranged according to the modulating frequency of laser light source, and reference signal is defeated
It send to phase sensitive detecting unit；
The phase sensitive detecting unit is used to obtain image information in conjunction with analog signal, reference signal and phase lock amplifying technology.
3. a kind of highly sensitive imaging system of low cost according to claim 1, which is characterized in that the laser controlling
Device includes two to dichronic mirror, the first lens and the second lens；
The laser controller by the light modulation of first wave length in first frequency, by the light modulation of second wave length in second frequency；
After the light that the light of the first wave length passes through the first lens and second wave length passes through the second lens, process two is to dichronic mirror shape
At coupling light, and will couple in light emission to subject.
4. a kind of highly sensitive imaging system of low cost according to claim 3, which is characterized in that the laser controlling
Device further includes reflective mirror and the third lens；
The light of the first wave length reaches the first lens after the reflection of reflective mirror, and the coupling light shines after passing through the third lens
It penetrates on subject.
5. a kind of highly sensitive imaging system of low cost according to claim 1, which is characterized in that the programmable number
Word micro mirror is made of multiple controllable micro mirror units, and each micro mirror unit has two states, by the shape for changing micro mirror unit
The encoder matrix of state design programmable digital micro mirror；
The first state of the micro mirror unit is the state that is deflected with the first predetermined angle of micro mirror unit, the of the micro mirror unit
Two-state is the state that micro mirror unit is deflected with the second predetermined angle, and changes the shape of micro mirror unit by control deflection angle
State.
6. a kind of imaging method for the imaging system that low cost is highly sensitive, which comprises the following steps:
After Laser modulation to predeterminated frequency, it is radiated on subject；
The image of subject is imaged on programmable digital micro mirror by object lens optically, and programmable digital micro mirror is to image
It is encoded；
Image light signals after coding reach single pixel sensor, the optical signal that single pixel sensor will receive by condenser
Be converted to analog signal；
After sensor module for reading and writing obtains the image information in analog signal by locking phase amplifying device, the image information that will acquire
It converts and is stored as numerical data；
Imaging display module restores according to numerical data and shows image.
7. a kind of imaging method of the highly sensitive imaging system of low cost according to claim 6, which is characterized in that institute
Sensor module for reading and writing is stated by the step after the image information in locking phase amplifying device acquisition analog signal, is specifically included following
Step:
Reference signal frequency is arranged according to the modulating frequency of laser light source in reference signal unit, and reference signal is delivered to phase
Sensitive detecting unit；
Phase sensitive detecting unit combination analog signal, reference signal and phase lock amplifying technology obtain image information；
The Frequency Synchronization of the analog signal and reference signal.
8. a kind of imaging method of the highly sensitive imaging system of low cost according to claim 7, which is characterized in that institute
The step of programmable digital micro mirror encodes image is stated to include the steps that configuring programmable digital micro mirror, specifically:
A1, programmable digital micro mirror is configured according to preset encoder matrix；
After A2, each sensor module for reading and writing acquisition image information, judge whether the configured number of programmable digital micro mirror reaches
Preset times, if so, restored image；Conversely, return step A1.
9. a kind of imaging method of the highly sensitive imaging system of low cost according to claim 6, which is characterized in that institute
The step of imaging display module restores according to numerical data and shows image is stated, specifically:
Imaging display module combination compressive sensing theory and optimization method carry out operation numerical data, to restore and show image.
10. according to a kind of described in any item imaging methods for the imaging system that low cost is highly sensitive of claim 6, feature
It is, described by after Laser modulation to predeterminated frequency, the step being radiated on subject, specifically includes the following steps:
Laser controller by the light modulation of first wave length in first frequency, by the light modulation of second wave length in second frequency；
By the light of first wave length across the first lens and the light of second wave length after the second lens, process two is formed to dichronic mirror
Light is coupled, and will be coupled in light emission to subject.
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| CN107134996A (en) * | 2017-04-27 | 2017-09-05 | 中山大学 | A kind of digital lock-in amplifier of many reference models |
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| CN107134996A (en) * | 2017-04-27 | 2017-09-05 | 中山大学 | A kind of digital lock-in amplifier of many reference models |
| CN107453810A (en) * | 2017-08-15 | 2017-12-08 | 上海微小卫星工程中心 | Communication device and method based on LED visible light and digital micromirror array |
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