CN113009688B - Quantum imaging method and quantum imaging system - Google Patents
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Abstract
The application provides a quantum imaging method and a quantum imaging system. The quantum imaging method comprises the following steps: determining the shape of the message formed after the incident light has been directed to the target objectNth order derivative S of phase with respect to time(n)(ii) a Acquiring nth order derivative I of reference light corresponding to signal light relative to time(n)(x, y); and according to the nth derivative S(n)And nth order derivative I(n)(x, y) constructing a quantum imaging model of the target object to obtain an image of the target object, wherein n is any positive integer, and (x, y) is a spatial coordinate of the reference light. According to the quantum imaging method, the multi-order derivative signals of the signal light and the reference light can be obtained through one-time measurement, the measurement times are reduced, and furthermore, quantum imaging can be quickly and efficiently realized by using the multi-order derivative signals. In addition, the quantum imaging method provided by the application reduces the data volume needing to be stored on the whole, reduces the burden of data storage and reduces the difficulty of hardware implementation in a quantum imaging system.
Description
Technical Field
The present application relates to the field of quantum imaging, and in particular, to a quantum imaging method and a quantum imaging system.
Background
The quantum imaging technique is an imaging technique for acquiring object information using a higher order correlation property of light. Quantum imaging generally requires two beams of light for imaging, one beam of light can be called signal light or detection light, irradiates a target object, interacts with the target object, and can be collected by a barrel detector; the other beam of light, corresponding to the signal light, may be referred to as a reference light and may be received by the array detector. A quantum imaging system (e.g., a signal processing module) can reproduce an image of an object by performing a number of complex operations on the data associated with each pixel collected on the array detector and the result of the collected signal light of the bucket detector.
Because the signal light required by quantum imaging can be collected by only one barrel detector, the quantum imaging has important application in the fields of three-dimensional imaging, radar ranging, microscopic imaging, encryption communication and the like. In addition, quantum imaging also provides advantages such as single pixel cameras in the absence of an array camera or in relatively expensive spectral bands (e.g., spectral bands of X-rays, infrared light, and THz).
However, the conventional quantum imaging method, which is mainly implemented by calculating the correlation function and the expected quantum value thereof, needs to calculate the average value of the whole data involved. Thus, all relevant image data needs to be stored and then computed before an image is acquired. This makes the conventional quantum imaging method require a large amount of measurement data, and further, the memory required to store the measurement data is very large, which is difficult to be implemented by using a chip, and further, the time for constructing an image by the quantum imaging method is too long.
For example, conventional quantum imaging methods employ a basis scanning algorithm (including Hadamard-based and fourier-based). Although this algorithm can achieve high-quality single-pixel imaging, the number of measurements of this algorithm must be consistent with the number of pixels, and is not suitable for large-screen images of the target object. For example, when the target object is a 1000 × 1000 image, it takes one million data measurements to obtain the image by using the base scanning algorithm, however, the spatial light modulator projecting each base pattern is 30KHz at the fastest, in other words, it takes 30 seconds to project one million base patterns, and therefore, the base scanning algorithm is difficult to perform real-time large-screen imaging.
In addition, although the Imaging quality of the target object can be improved by using the existing quantum Imaging algorithms like Differential host Imaging algorithm, Normalized host Imaging algorithm, high-Order host Imaging algorithm and the like, the algorithms need to store a large amount of data to calculate the average value, are difficult to realize by using a chip, and are not beneficial to the application of quantum Imaging.
Disclosure of Invention
The present application provides a quantum imaging method and a quantum imaging system that can at least partially solve the above-mentioned problems in the prior art.
One aspect of the present application provides a quantum imaging method, the method comprising: determining the nth derivative S of signal light relative to time formed after incident light irradiates on a target object(n)(ii) a Acquiring nth order derivative I of reference light corresponding to the signal light with respect to time(n)(x, y); and according to said nth derivative S(n)And the nth derivative I(n)(x, y) structureAnd establishing a quantum imaging model of the target object to obtain an image of the target object, wherein n is any positive integer, and (x, y) is the space coordinate of the reference light.
In one embodiment of the present application, the image of the target object is constructed according to the following rules
The quantum imaging model of (1):
wherein the content of the first and second substances,<…>is a quantum average.
In another aspect, the present application provides a quantum imaging system, the system comprising: a thermal light source for emitting light; the beam splitter is arranged on the light path of the light and is used for splitting the light into a first light splitting beam and a second light splitting beam; the barrel detector is arranged on a light path of the first split light and used for collecting signal light formed after the first split light irradiates a target object; the area array detector is arranged on a light path of the second light split and is used for collecting the second light split corresponding to the signal light; and the signal processing module is used for acquiring the nth derivative of the signal light relative to time, acquiring the nth derivative of the second split light relative to time, and calculating according to the nth derivative of the signal light relative to time and the nth derivative of the second split light relative to time to obtain the image of the target object, wherein n is any positive integer.
In another aspect, the present application provides a quantum imaging system, the system comprising: a modulated thermal light source for emitting incident light; the barrel detector is arranged on a light path of the incident light and is used for collecting signal light formed after the incident light irradiates a target object; and the signal processing module is used for acquiring the nth derivative of the signal light relative to time, and calculating according to the nth derivative of the signal light relative to time and the nth derivative of the reference light corresponding to the signal light relative to time to obtain the image of the target object, wherein n is any positive integer.
In an embodiment of the present application, a modulation signal and its nth derivative with respect to time are stored in advance in the signal processing module as the nth derivative with respect to time of the reference light, and the modulation signal is modulated into the optical field distribution of the modulated thermal light source by a modulator.
According to the quantum imaging method and the quantum imaging system provided by the embodiment of the application, the multi-order derivative signals of the signal light and the reference light can be obtained through one-time measurement, the measurement times are reduced, and furthermore, quantum imaging can be rapidly and efficiently realized by using the multi-order derivative signals.
In addition, through at least one embodiment of the application, the quantum imaging method provided by the application reduces the data volume needing to be stored on the whole, reduces the burden of data storage, reduces the difficulty of hardware implementation in a quantum imaging system, enables the chip available for quantum imaging to be used for online real-time imaging, and is favorable for quantum imaging to be practical.
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Other features, objects, and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings. Wherein:
FIG. 1 is a schematic illustration of steps of a quantum imaging method according to an embodiment of the present application;
FIG. 2 is a schematic diagram of the structure and operation of a quantum imaging system according to a first embodiment of the present application;
FIG. 3 is a schematic illustration of a pattern of a patterned glass surface according to an embodiment of the present application;
FIG. 4A is a schematic view of a target object according to an embodiment of the present application;
FIG. 4B is a graph of imaging results of a target object according to an embodiment of the present application;
FIG. 5 is a schematic diagram of the structure and operation of a quantum imaging system according to a second embodiment of the present application; and
fig. 6 is a schematic structural diagram of a signal processing module in a quantum imaging system according to an embodiment of the present application.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in this specification the expressions first, second, third etc. are only used to distinguish one feature from another, and do not indicate any limitation of features, in particular any order of precedence. Thus, the first split light discussed in this application may also be referred to as the second split light and the first array detector may also be referred to as the second array detector, or vice versa, without departing from the teachings of this application.
In the drawings, the thickness, size and shape of the components have been slightly adjusted for convenience of explanation. The figures are purely diagrammatic and not drawn to scale. As used herein, the terms "approximately", "about" and the like are used as table-approximating terms and not as table-degree terms, and are intended to account for inherent deviations in measured or calculated values that would be recognized by one of ordinary skill in the art.
It will be further understood that terms such as "comprising," "including," "having," "including," and/or "containing," when used in this specification, are open-ended and not closed-ended, and specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of" appears after a list of listed features, it modifies that entire list of features rather than just individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including engineering and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. In addition, unless explicitly defined or contradicted by context, the specific steps included in the methods described herein are not necessarily limited to the order described, but can be performed in any order or in parallel. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Further, in this application, when "connected" or "coupled" is used, it may mean either direct contact or indirect contact between the respective components, unless there is an explicit other limitation or can be inferred from the context.
Fig. 1 is a schematic step diagram of a quantum imaging method 1000 according to an embodiment of the present application. As shown in fig. 1, the present application provides a quantum imaging method 1000 that may include:
s1, determining the nth order derivative S of the signal light relative to the time t after the incident light irradiates the target object(n)。
S2, obtaining nth order derivative I of reference light corresponding to signal light relative to time t(n)(x，y)。
S3, according to the nth derivative S(n)And nth order derivative I(n)(x, y) constructing a quantum imaging model of the target object to obtain an image of the target object, wherein n is any positive integer, and (x, y) is a spatial coordinate of the reference light.
The specific steps of the quantum imaging method 1000 will be described in detail below with reference to fig. 2 to 6.
Step S1
Fig. 2 is a schematic diagram of the structure and operation of a quantum imaging system 2000 according to a first embodiment of the present application.
As shown in fig. 2, in the first embodiment of the present application, step S1 determines the nth order derivative S of signal light with respect to time t formed after incident light is irradiated to a target object(n)May for example include: providing a thermal light source 2100; forming incident light to be irradiated to a target object; acquiring signal light formed after the incident light is irradiated to the target object 2200; and determining the nth derivative S of the signal light with respect to time t(n)。
The thermal light source 2100 required in the quantum imaging method 1000 is a pseudo-thermal light source that can greatly simulate the light field statistics of true thermo-light.
The thermal light source 2100 may be implemented by any one or combination of sunlight, laser, incandescent lamp, or other light sources, but is not limited thereto.
In one embodiment of the present application, the thermal light source 2100 can be implemented by changing coherent light into pseudo-thermal light after laser light emitted from a laser passes through a moving glass with a Pattern (Pattern), as shown in fig. 3. Alternatively, in another embodiment of the present application, the patterned glass may be replaced with ground glass. This is not a limitation of the present application.
Alternatively, in an embodiment of the present application, a laser light source emitting a wavelength of, for example, 532nm may be selected as the thermal light source 2100.
In one embodiment of the present application, the incident light may be obtained by splitting the thermal light source 2100 into two light beams corresponding to each other by, for example, the beam splitter 2300. The beam splitter 2300 may be disposed on an optical path of light emitted from the thermal light source 2100.
The incident light is irradiated onto the target object 2200, and may form a signal light after being reflected or transmitted by the target object 2200, and is collected by, for example, the bucket detector 2400.
FIG. 4A is a schematic view of a target object according to an embodiment of the present application.
As shown in fig. 4A, the target object 2200 may be various objects to be imaged, which is not limited in the present application. In one embodiment of the present application, the target object 2200 may be a hollow pattern formed on the surface of the substrate, for example, the pattern may be the capital letter "T". The signal light can be formed by the incident light after it is reflected or transmitted by the english capital letter "T" (the target object 2200).
The bucket detector 2400 is a photodetector having a certain area. In some embodiments, the bucket detector 2400 may be at least one or any combination of a large area photodiode, a photodiode array detector, an area array CCD, and an area array CMOS. Further, in an embodiment of the present application, the bucket detector 2400 may select a hamamatsu S13620 array detector with a pixel count of 8 × 8. The bucket detector 2400 may be disposed on an optical path of incident light emitted from the thermal light source 2100.
Fig. 6 is a schematic structural diagram of a signal processing module 2600 in a quantum imaging system according to an embodiment of the present application.
As shown in FIG. 6, the signal processing module 2600 can obtain the nth derivative S of the signal light with respect to time t(n). Specifically, the signal processing module 2600 has a computing function, and may include a bucket detector signal interface 2610, a power and clock unit (not shown), and a data processing unit 2630. The barrel detector signal interface 2610 is electrically connected with the barrel detector 2400 and is used for transmitting the signal light collected by the barrel detector 2400 to the data processing unit 2630 of the signal processing module 2600. The power and clock unit is electrically connected to the data processing unit 2630 and is used for providing power and clock to the data processing unit 2630. The data processing unit 2630 may be configured to determine an nth order derivative S of the signal light with respect to the time t according to the received signal light(n)。
Specifically, in some embodiments of the present application, determining the nth order Derivative S of the signal light with respect to the time t according to the received signal light may be implemented by providing any suitable module capable of performing a Derivative operation, such as a Derivative module, an Integrator module, and a Discrete Derivative module, in the data processing unit 2630(n). The above-mentioned derivative module can approximately obtain the derivative dS/dt of the input signal S (signal light) input to the derivative module with respect to the simulation time t. In other words, the derivative module can be obtained byObtaining the ratio of the variation difference Delta S of the input signal S to the adjacent two simulation time difference Delta t (time step length), and determining the nth order derivative S of the signal light relative to the time t(n)Wherein the nth derivative S of the signal light with respect to time t(n)The first derivative, the second derivative or even the nth derivative of the signal light with respect to the time t may be provided, and n is any positive integer, which is not limited in the present application.
Fig. 5 is a schematic diagram of the structure and operation of a quantum imaging system according to a second embodiment of the present application.
As shown in fig. 5, in the second embodiment of the present application, step S1 determines the nth order derivative S of signal light with respect to time t formed after incident light is irradiated to a target object(n)May for example include: acquiring a modulated hot light source 2700 to form incident light to be irradiated to a target object; acquiring signal light formed after incident light is irradiated to the target object 2200; and determining the nth derivative S of the signal light with respect to time t(n)。
Modulated thermal light source 2700 is also a pseudo-thermal light source that can greatly simulate the optical field statistics of true thermal light.
Specifically, in one embodiment of the present application, the modulated thermal light source 2700 may be prepared by modulating a lattice light source such as an LED array with a modulation signal, and alternatively, in another embodiment of the present application, the modulated thermal light source 2700 may be realized by irradiating an optical modulator with light such as laser light, sunlight, LED light, and the like.
In an embodiment of the present application, the modulation signal may be a random matrix generated by, for example, a computer, which is not limited in this application.
The emitted light of the modulated hot light source 2700 may be directly irradiated onto the target object 2200 as incident light, may be reflected or transmitted by the target object 2200 to form signal light, and may be collected by, for example, the bucket detector 2400. In this embodiment, the target object 2200 may be various objects to be imaged, which is not limited in this application.
Since "the nth order derivative S of the signal light with respect to the time t is determined in the first embodiment described above(n)The specific method ofThe contents and structure of (a) and (b) may be applied in whole or in part to "determining nth order derivative S of signal light with respect to time t" in the second embodiment described herein(n)The detailed description of the method "and related or similar contents are not repeated.
Step S2
Referring again to fig. 2, in the first embodiment of the present application, step S2 acquires the nth order derivative I of the reference light corresponding to the signal light with respect to time t(n)(x, y) may include, for example: providing a thermal light source 2100; forming a reference light; collecting reference light by the area array detector 2500; and acquiring the nth derivative I of the reference light with respect to time t(n)(x，y)。
Specifically, in an embodiment of the present application, the thermal light source 2100 may be implemented by changing coherent light into pseudo thermal light after laser light emitted from a laser passes through, for example, rotating ground glass. In one embodiment of the present application, a beam of laser light with a wavelength of, for example, 532nm, may be selected as the thermal light source 2100.
In one embodiment of the present application, the reference light may be obtained by splitting the thermal light source 2100 into two beams corresponding to each other by, for example, the beam splitter 2300, wherein one beam is the incident light for irradiating the target object 200 and the other beam is the reference light corresponding to the incident light. The beam splitter 2300 may be disposed on an optical path of light emitted from the thermal light source 2100.
The area array detector 2500 is disposed on the optical path of the reference light, and is configured to collect the reference light corresponding to the signal light. In some embodiments, the area array detector 2500 may include at least one or any combination of an area array CCD and an area array CMOS. Alternatively, in some embodiments of the present application, the area array detector 2500 may be selected to be the same detector as the bucket detector 2400. Further, the area array detector 2500 may be a hamamatsu S13620 array detector, which has a pixel number of 8 × 8 to adapt to the measurement of the high-speed derivative signal.
Referring again to FIG. 6, the signal processing module 2600 can obtain the nth order derivative I of the reference light with respect to time t(n)(x, y), wherein (x, y) is a spatial coordinate of the reference light, in other wordsAnd (x, y) is coordinates of a pixel point on the area array detector 2500 corresponding to the signal light when the reference light is collected by the area array detector 2500.
Specifically, the signal processing module 2600 has computing functionality and may include a bucket detector signal interface 2610, an area array detector interface 2620, a power and clock unit (not shown), and a data processing unit 2630. The area array detector interface 2620 is electrically connected to the area array detector 2500, and is configured to transmit the reference light collected by the area array detector 2500 to the data processing unit 2630 of the signal processing module 2600. The power and clock unit is electrically connected to the data processing unit 2630 and is used for providing power and clock to the data processing unit 2630. The data processing unit 2630 is configured to obtain an nth derivative I of the reference light with respect to time t according to the received reference light(n)(x,y)。
Specifically, in some embodiments of the present application, obtaining the nth order Derivative I of the reference light with respect to time t according to the received reference light may be implemented by providing any suitable element capable of performing a Derivative operation, such as a Derivative element, an Integrator element, and a Discrete Derivative element, in the data processing unit 2630(n)(x, y). The derivative module described above can approximately obtain the derivative dl/dt of the input signal I (x, y) (reference light) input to the derivative module with respect to the simulation time t. In other words, the above derivative module can obtain the nth derivative I of the reference light relative to the time t by obtaining the ratio of the variation difference Δ I of the input signal I (x, y) to the adjacent two simulated time differences Δ t (time step)(n)(x, y) wherein the nth derivative I of the reference light with respect to time t(n)The (x, y) may be a first derivative, a second derivative or even an nth derivative of the reference light with respect to time t, and n is any positive integer, which is not limited in this application.
Referring again to fig. 5, in the second embodiment of the present application, step S2 acquires the nth order derivative I of the reference light corresponding to the signal light with respect to time t(n)(x, y) may include, for example: providing a modulated hot light source 2700; and pre-storing the nth order derivative I of the reference light with respect to time t in the signal processing module 2600(n)(x,y)。
Specifically, in one embodiment of the present application, the modulated thermal light source 2700 may be prepared by modulating, for example, a dot matrix light source by a modulation signal, and alternatively, in another embodiment of the present application, the modulated thermal light source 2700 may be realized by irradiating an optical modulator with light such as laser light, solar light, LED light, or the like. In an embodiment of the present application, the modulation signal may be a random matrix generated by, for example, a computer, which is not limited in this application. In an embodiment of the present application, while generating the modulated hot light source 2700, the nth order derivative I of the reference light with respect to time t may be obtained by the modulation signal(n)(x, y) and may be pre-stored in the signal processing module 2600 before, for example, the signal light is transmitted to the signal processing module 2600. In other words, the modulation signal and its nth derivative with respect to the time t may be stored in the signal processing module 2600 in advance as the nth derivative of the reference light with respect to the time t, and modulated into the optical field distribution of the modulated thermal light source by the modulator.
In the embodiment, by storing the nth derivative of the reference light relative to time in advance, on one hand, the quantum imaging method can be simplified, and the process of collecting the reference light and the process of acquiring the derivative of the reference light by the signal processing module through the collected reference light are omitted; in addition, on the one hand, the quantum imaging system can be simplified, a reference light path is omitted, the quantum imaging system is convenient to move, and the quantum imaging system is more portable and practical.
Step S3
Referring again to FIG. 6, step S3 is based on the nth order derivative S(n)And nth order derivative I(n)(x, y) constructing a quantum imaging model of the target object to obtain an image of the target object may include, for example: constructing an image of a target object 2200
And signal processing module 2600 obtains an image of target object 2200 by calculation based on the quantum imaging model.
The traditional quantum imaging method is mainly realized by calculating a correlation function and a quantum expected value thereof, and an average value of related overall data needs to be calculated. Thus, all relevant image data needs to be stored and then computed before an image is acquired. The traditional quantum imaging method has three problems, a large amount of measurement data is needed, and the measurement times are excessive; the measurement time is too long, the data calculation amount is too large, and the image reconstruction time is too long; and because the related image data is too large, the storage unit required by the traditional quantum imaging method is very large, the method is not suitable for being realized by using a chip, the online real-time imaging is difficult to realize, and the method is not beneficial to the practical application of the quantum imaging.
The quantum imaging method can obtain the multi-order derivative signals of the signal light and the reference light through one-time measurement, reduces the measurement times, and can quickly and efficiently realize quantum imaging by applying the multi-order derivative signals.
In addition, through at least one embodiment of the application, the quantum imaging method provided by the application reduces the data volume needing to be stored on the whole, reduces the burden of data storage, reduces the difficulty of hardware implementation in a quantum imaging system, enables the chip available for quantum imaging to be used for online real-time imaging, and is favorable for quantum imaging to be practical.
Specifically, in an embodiment of the present application, the image of the target object 2200 may be constructed according to the following rule
The quantum imaging model of (1):
wherein < … > is the quantum average (1)
Obtaining an image of a target object by calculation according to the imaging model of formula (1) and calculating by standard quantum imaging(2)(x,y)＝<SI(x,y)>The obtained results are similar, and the image of the target object can be reproduced by the imaging model of formula (1).
The quantum imaging method using the imaging model can obtain multi-order derivative signals of the signal light and the reference light through one-time measurement, reduces the measurement times, and further can quickly and efficiently realize quantum imaging by using the multi-order derivative signals.
Fig. 4B is a diagram of imaging results of a target object according to an embodiment of the present application.
As shown in fig. 4B, in an embodiment of the present application, the target object 2200 may be a hollow pattern formed on the substrate surface, for example, the pattern may be an english capital letter "T", and the signal processing module 2600 may, based on a quantum imaging model, for example, the imaging model of the above formula (1), clearly present the english capital letter "T" in a plane defined by, for example, the horizontal direction x and the vertical direction y perpendicular to the horizontal direction x of the target object 2200 through calculation, in other words, the present application uses a quantum imaging method such as the above imaging model, and the imaging "T" of the target object is composed of pixels with relatively large associated signal intensity, and thus can be clearly presented.
In particular, the signal processing module 2600 has computing functionality and may include a bucket detector signal interface 2610, a reference light detector signal interface 2620, a power and clock unit (not shown), and a data processing unit 2630. The data processing unit 2630 may determine the nth order derivative S of the signal light with respect to the time t based on the nth order derivative S(n)And the nth derivative I of the reference light with respect to time t(n)(x, y) an image of the target object 2200 is obtained by calculation using an imaging model such as the formula (1).
In an embodiment of the present application, the data processing unit 2630 may include any suitable logic programming element such as an FPGA, a DSP, a computer, a special ASIC, and the like, which is not limited in the present application. By editing an imaging model provided by the application, such as formula (1), into any one of the above elements and taking the nth order derivative S of the signal light with respect to time t(n)And the nth derivative I of the reference light with respect to time t(n)(x, y) input, an image of the target object 2200 may be obtained.
The signal processing module realizes the image of a target object based on FPGA, DSP, a computer, a special ASIC and the like, and greatly promotes quantum imaging to a practical direction, so that online real-time imaging can be realized.
Referring again to fig. 2, yet another aspect of the present application also provides a quantum imaging system 2000. The quantum imaging system 2000 may be manufactured by any of the manufacturing methods of the first embodiment. The quantum imaging system 2000 may include: a thermal light source 2100, a beam splitter 2300, a bucket detector 2400, an area array detector 2500, and a signal processing module 2600.
Specifically, the thermal light source 2100 is used to emit light. The beam splitter 2300 is disposed on the optical path of the light, and splits the light into a first split light (incident light) and a second split light (reference light). The barrel detector 2400 is disposed on a light path of the incident light, and is configured to collect signal light formed after the incident light irradiates the target object 2200. The area array detector 2500 is disposed on the optical path of the reference light, and is configured to collect the reference light corresponding to the signal light. The signal processing module 2600 can be used to obtain the nth derivative S of the signal light with respect to time t(n)Obtaining the nth derivative I of the reference light with respect to time t(n)(x, y) and the nth derivative S with respect to time t according to the signal light(n)And the nth derivative I of the reference light with respect to time t(n)(x, y) is calculated so as to obtain an image of the target object 2200, where n is an arbitrary positive integer.
In one embodiment of the present application, the signal processing module 2600 may construct an image of the target object 2200 according to the following rules
The quantum imaging model of (1):
Referring again to fig. 5, yet another aspect of the present application also provides a quantum imaging system 2000. The quantum imaging system 2000 may be manufactured by any of the manufacturing methods of the second embodiment. The quantum imaging system 2000 may include: a modulated hot light source 2700, a bucket detector 2400, and a signal processing module 2600.
In particular, the modulated thermal light source 2700 is used to emit incident light. The barrel detector 2400 is disposed on a light path of the incident light, and is configured to collect signal light formed after the incident light irradiates the target object. Signal processing module 2600 obtains nth derivative S of signal light with respect to time t(n)And according to the nth derivative S of the signal light with respect to time t(n)And nth order derivative I of reference light corresponding to the signal light with respect to time t(n)(x, y) is calculated so as to obtain an image of the target object 2200, where n is an arbitrary positive integer.
In one embodiment of the present application, the signal processing module 2600 may construct an image of the target object 2200 according to the following rules
The quantum imaging model of (1):
In one embodiment of the present application, the modulated thermal light source 2700 may be prepared by modulating, for example, a dot matrix thermal light source by a modulation signal, and alternatively, in another embodiment of the present application, the modulated thermal light source 2700 may be realized by irradiating an optical modulator with, for example, laser light, sunlight, LED light, or the like.
In an embodiment of the present application, while generating the modulated hot light source 2700, the nth order derivative I of the reference light with respect to time t may be obtained by the modulation signal(n)(x, y), and may be previously stored in the signal processing module 2600 before the signal light is transmitted to the signal processing module 2600. In other words, the modulation signal and its nth derivative with respect to the time t may be stored in the signal processing module 2600 in advance as the nth derivative of the reference light with respect to the time t, and modulated into the optical field distribution of the modulated thermal light source by the modulator.
In the foregoing embodiment, according to the quantum imaging system provided in another aspect of the present application, by storing the nth derivative of the reference light with respect to time in advance, the quantum imaging system may be simplified, the reference light path may be omitted, and the quantum imaging system may be moved conveniently, so that the quantum imaging system is more portable and practical.
Since the contents and structures referred to above in describing the quantum imaging method may be fully or partially applicable to the quantum imaging system described herein, the contents related or similar thereto will not be described in detail.
According to the quantum imaging system provided by any embodiment of the application, the multi-order derivative signals of the signal light and the reference light can be obtained through one-time measurement, the measurement times are reduced, and quantum imaging can be quickly and efficiently realized by using the multi-order derivative signals.
In addition, through at least one embodiment of the application, the quantum imaging method provided by the application reduces the data volume needing to be stored on the whole, reduces the burden of data storage, further reduces the difficulty of hardware implementation in a quantum imaging system, enables the quantum imaging available chip to perform online real-time imaging, and is favorable for the quantum imaging to be practical.
The above description is only an embodiment of the present application and an illustration of the technical principles applied. It will be appreciated by a person skilled in the art that the scope of protection covered by the present application is not limited to the embodiments with a specific combination of the features described above, but also covers other embodiments with any combination of the features described above or their equivalents without departing from the technical idea. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (4)
1. A method of quantum imaging, the method comprising:
determining the nth derivative S of signal light relative to time formed after incident light irradiates to a target object(n)；
Acquiring nth order derivative I of reference light corresponding to the signal light with respect to time(n)(x, y); and
according to the nth derivative S(n)And the nth derivative I(n)(x, y) constructionA quantum imaging model of the target object to obtain an image of the target object,
wherein the image of the target object is constructed according to the following rules
The quantum imaging model of (1):
< … > is a quantum average, n is an arbitrary positive integer, and (x, y) is a spatial coordinate of the reference light.
2. A quantum imaging system, characterized in that the system comprises:
a thermal light source for emitting light;
the beam splitter is arranged on the light path of the light and is used for splitting the light into a first light splitting beam and a second light splitting beam;
the barrel detector is arranged on a light path of the first split light and used for collecting signal light formed after the first split light irradiates a target object;
the area array detector is arranged on a light path of the second light split and used for collecting the second light split corresponding to the signal light; and
the signal processing module is used for acquiring the nth derivative of the signal light relative to the time, acquiring the nth derivative of the second split light relative to the time and calculating according to the nth derivative of the signal light relative to the time and the nth derivative of the second split light relative to the time so as to obtain the image of the target object,
wherein the image of the target object is constructed according to the following rules
The quantum imaging model of (2):
< … > is a quantum average, n is any positive integer.
3. A quantum imaging system, characterized in that the system comprises:
a modulated thermal light source for emitting incident light;
the barrel detector is arranged on a light path of the incident light and is used for collecting signal light formed after the incident light irradiates a target object; and
a signal processing module for acquiring the nth derivative of the signal light with respect to time, calculating according to the nth derivative of the signal light with respect to time and the nth derivative of the reference light corresponding to the signal light with respect to time to obtain an image of the target object,
wherein the image of the target object is constructed according to the following rules
The quantum imaging model of (1):
< … > is a quantum average, n is any positive integer.
4. The quantum imaging system of claim 3,
the modulation signal and the nth derivative thereof relative to time are stored in the signal processing module in advance as the nth derivative of the reference light relative to time, and the modulation signal is modulated into the optical field distribution of the modulation heat light source by a modulator.
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