Spectral imaging control system and method

Abstract

The invention discloses a spectral imaging control system and method, and relates to the field of spectral imaging, in the spectral imaging control system, a light path switching module is used for turning to a black body during radiometric calibration to enable reference light emitted by the black body to enter an interferometer, and turning to an external environment during measurement to enable external light to enter the interferometer; the interferometer is used for modulating the received light to obtain corresponding interference light; the infrared detector detects the interference light to obtain an interferogram analog signal; the amplifier is used for amplifying and filtering the interferogram analog signal; the acquisition module converts the amplified signal into a digital signal to obtain an interferogram digital signal; and the upper computer performs FFT conversion on the reference interferogram digital signal and the measurement interferogram digital signal to obtain reference spectral data and measurement spectral data, and performs radiometric calibration on the measurement spectral data by using the reference spectral data to obtain radiation spectral data. According to the invention, accurate control of spectral imaging can be realized.

Description

Technical Field

[0001] The present invention relates to the field of spectral imaging, and in particular to a spectral imaging control system and method. Background Art

[0002] In order to counter the threats of advanced reconnaissance technology and precision strike weapons in future wars, the defense functions of various types of weapons and equipment have developed from a single spectrum to multi-functional, multi-spectrum stealth technology. The target and the background can be close to "the same color and spectrum" within a certain wavelength range, making it difficult for traditional detection methods to effectively identify them.

[0003] Under high spatial resolution imaging conditions, hyperspectral imaging has the ability to obtain subtle differences in the spectrum of each pixel of the scene. Through quantitative analysis of spectral characteristics, it can detect subtle changes in spectral characteristics between true and false targets, targets and camouflage, and covers and the surrounding normal environment, and determine the target position. It has become a new and important means of reconnaissance and strike effect evaluation. Therefore, how to achieve precise control of spectral imaging has become a problem that needs to be solved urgently. Summary of the invention

[0004] Based on this, an embodiment of the present invention provides a spectral imaging control system and method to achieve precise control of spectral imaging.

[0005] To achieve the above purpose, the embodiment of the present invention provides the following solution:

[0006] A spectral imaging control system, comprising: an optical path switching module, a black body, an interferometer, an infrared detector, an amplifier, a collection module and a host computer;

[0007] The optical path switching module is used to turn to the black body during radiation calibration so that the reference light emitted by the black body enters the interferometer, and to turn to the external environment during measurement so that the external light enters the interferometer;

[0008] The interferometer is used to modulate the reference light to obtain reference interference light, and modulate the external light to obtain measurement interference light;

[0009] The infrared detector is used to detect the reference interference light to obtain a reference interference pattern analog signal, and to detect the measurement interference light to obtain a measurement interference pattern analog signal;

[0010] The amplifier is connected to the infrared detector; the amplifier is used to amplify and filter the reference interference pattern analog signal to obtain an amplified reference interference pattern analog signal, and to amplify and filter the measurement interference pattern analog signal to obtain an amplified measurement interference pattern analog signal;

[0011] The acquisition module is connected to the amplifier; the acquisition module is used to convert the amplified reference interference pattern analog signal into a digital signal to obtain a reference interference pattern digital signal, and convert the amplified measurement interference pattern analog signal into a digital signal to obtain a measurement interference pattern digital signal;

[0012] The host computer is connected to the acquisition module; the host computer is used to perform FFT transformation on the reference interference pattern digital signal to obtain reference spectrum data, perform FFT transformation on the measurement interference pattern digital signal to obtain measurement spectrum data, and use the reference spectrum data to perform radiation calibration on the measurement spectrum data to obtain radiation spectrum data; the radiation spectrum data is used to determine the infrared radiation characteristics of the target in the external environment.

[0013] Optionally, the spectral imaging control system further includes: a refrigerator and a refrigerator driver;

[0014] The refrigerator is connected to the refrigeration driver and the infrared detector respectively;

[0015] The refrigeration driver is used to control the refrigeration capacity output by the refrigerator;

[0016] The refrigerator is used to provide a working environment with a set temperature for the infrared detector.

[0017] Optionally, the spectral imaging control system further includes: a temperature controller;

[0018] The thermostat is connected to the black body; the thermostat is used to control the temperature of the black body.

[0019] Optionally, the spectral imaging control system further includes: a power supply control module;

[0020] The power control module is connected to the optical path switching module, the interferometer, the amplifier and the acquisition module respectively.

[0021] Optionally, the optical path switching module specifically includes: a reflector, a drive motor and a rotating drum;

[0022] The reflector is fixed on the rotating drum; the rotating drum is connected to the driving motor; the driving motor is used to drive the rotating drum to rotate so as to change the direction of the reflector; during radiation calibration, the reflector faces the black body, and during measurement, the reflector faces the external environment.

[0023] Optionally, the set temperature is 77K.

[0024] The present invention also provides a spectral imaging control method, which is used in the above-mentioned spectral imaging control system, and comprises:

[0025] Controlling the optical path switching module to turn to the black body, so that the reference light emitted by the black body enters the interferometer, the interferometer modulates the reference light to obtain the reference interference light, the infrared detector detects the reference interference light to obtain the reference interference pattern analog signal, the amplifier amplifies and filters the reference interference pattern analog signal to obtain the amplified reference interference pattern analog signal, the acquisition module converts the amplified reference interference pattern analog signal into a digital signal to obtain the reference interference pattern digital signal, and the host computer performs FFT transformation on the reference interference pattern digital signal to obtain the reference spectrum data and store it;

[0026] After obtaining the reference spectrum data, the optical path switching module is controlled to turn to the external environment so that the external light enters the interferometer, the interferometer modulates the external light to obtain the measurement interference light, the infrared detector detects the measurement interference light to obtain the measurement interference pattern analog signal, the amplifier amplifies and filters the measurement interference pattern analog signal to obtain the amplified measurement interference pattern analog signal, the acquisition module converts the amplified measurement interference pattern analog signal into a digital signal to obtain the measurement interference pattern digital signal, the host computer performs FFT transformation on the measurement interference pattern digital signal to obtain the measurement spectrum data, and uses the stored reference spectrum data to perform radiation calibration on the measurement spectrum data to obtain radiation spectrum data; the radiation spectrum data is used to determine the infrared radiation characteristics of the target in the external environment.

[0027] Optionally, before controlling the optical path switching module to turn to the black body so that the reference light emitted by the black body enters the interferometer, the method further includes:

[0028] The refrigerator is controlled to provide a working environment of a set temperature for the infrared detector.

[0029] Optionally, before controlling the optical path switching module to turn to the black body so that the reference light emitted by the black body enters the interferometer, the method further includes:

[0030] A temperature controller is used to control the temperature of the black body so that the temperature of the black body is in a stable state.

[0031] Optionally, before controlling the optical path switching module to turn to the black body so that the reference light emitted by the black body enters the interferometer, the method further includes:

[0032] The power control module is controlled to supply power according to the voltage required by the optical path switching module, the interferometer, the amplifier and the acquisition module.

[0033] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0034] The embodiment of the present invention switches the reference light emitted by the black body and the external light during measurement through an optical path switching module, uses an interferometer to interfere with the optical fiber, detects the interference pattern analog signal by the infrared detector, and the amplifier performs advanced filtering on the signal and then collects and converts it into an interference pattern digital signal by the acquisition module. The upper computer calculates and processes the reference interference pattern digital signal and the measurement interference pattern digital signal to achieve radiation calibration of the measured spectral data. The measurement value of the black body calibration correction system is used to make the final radiation spectrum data have high accuracy. Therefore, the present invention realizes precise control of spectral imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0036] Figure 1 This is a structural diagram of a spectral imaging control system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] See also Figure 1 The spectral imaging control system of this embodiment includes: an optical path switching module, a black body, an interferometer, an infrared detector, an amplifier, a collection module and a host computer.

[0040] The optical path switching module is used to turn to the black body during radiation calibration so that the reference light emitted by the black body enters the interferometer, and to turn to the external environment during measurement so that the external light enters the interferometer.

[0041] The black body is used for radiation calibration of the system. The light path is switched to the black body, and the measured value of the system is corrected by calibration of black bodies of different temperatures, thereby obtaining the spectral radiation value.

[0042] The interferometer is used to modulate the reference light to obtain reference interference light, and to modulate the external light to obtain measurement interference light.

[0043] The infrared detector is used to detect the reference interference light to obtain a reference interference pattern analog signal, and to detect the measurement interference light to obtain a measurement interference pattern analog signal.

[0044] The amplifier is connected to the infrared detector; the amplifier is used to amplify and filter the reference interference pattern analog signal to obtain the amplified reference interference pattern analog signal, and to amplify and filter the measurement interference pattern analog signal to obtain the amplified measurement interference pattern analog signal.

[0045] The acquisition module is connected to the amplifier; the acquisition module is used to convert the amplified reference interference pattern analog signal into a digital signal to obtain a reference interference pattern digital signal, and convert the amplified measurement interference pattern analog signal into a digital signal to obtain a measurement interference pattern digital signal.

[0046] The host computer is connected to the acquisition module; the host computer is used to perform FFT transformation on the reference interference pattern digital signal to obtain reference spectrum data, perform FFT transformation on the measurement interference pattern digital signal to obtain measurement spectrum data, and use the reference spectrum data to perform radiation calibration on the measurement spectrum data to obtain radiation spectrum data; the radiation spectrum data is used to determine the infrared radiation characteristics of the target in the external environment.

[0047] In one example, the infrared detector includes: a medium-wave infrared detector and a long-wave infrared detector. The spectral imaging control system also includes: a detector switching module. The detector switching module is connected to the host computer, and the host computer is also used to send a detection switching signal to the detector switching module. The detector switching module is used to control the switching of the medium-wave infrared detector and the long-wave infrared detector according to the detection switching signal. The detection switching signal can be a control signal input to the host computer by an operator according to the wavelength range of the infrared detector required by the actual situation.

[0048] In practical applications, since the actual response of infrared detectors varies from manufacturer to manufacturer and from model to model, the wavelength range of medium-wave infrared detectors and long-wave infrared detectors is determined according to actual conditions. For example, the wavelength range of medium-wave infrared detectors can be 3-5 microns, and the wavelength range of long-wave infrared detectors can be 8-14 microns.

[0049] The medium-wave infrared detector and long-wave infrared detector in this example can be switched, which can be applied to simultaneous medium-wave and long-wave infrared spectral imaging, thus expanding the application scope of spectral imaging.

[0050] In one example, see Figure 1The spectral imaging control system further includes: a refrigerator and a refrigerator driver. The refrigerator is connected to the refrigerator driver and the infrared detector respectively; the refrigerator driver is used to control the cooling capacity output by the refrigerator; and the refrigerator is used to provide a set temperature working environment for the infrared detector.

[0051] In practical applications, if the infrared detector includes: a medium-wave infrared detector and a long-wave infrared detector, the refrigerator includes: a first refrigerator and a second refrigerator, and the refrigerator driver includes a first refrigerator driver and a second refrigerator driver. The first refrigerator is connected to the first refrigerator driver and the medium-wave infrared detector respectively; the first refrigerator driver is used to control the cooling capacity output by the first refrigerator; the first refrigerator is used to provide a set temperature working environment for the medium-wave infrared detector. The second refrigerator is connected to the second refrigerator driver and the long-wave infrared detector respectively; the second refrigerator driver is used to control the cooling capacity output by the second refrigerator; the second refrigerator is used to provide a set temperature working environment for the medium-wave infrared detector.

[0052] Among them, the set temperature can be 77K, the detector switching module controls the medium-wave infrared detector or the long-wave infrared detector to turn on according to the detection switching signal sent by the host computer, and the corresponding refrigerator driver drives the corresponding refrigerator to work, and by controlling the output of the cooling capacity of the refrigerator, it is ensured that the medium-wave infrared detector or the long-wave infrared detector works in a 77K environment.

[0053] In one example, see Figure 1 The spectral imaging control system further includes: a temperature controller. The temperature controller is connected to the black body; the temperature controller is used to control the temperature of the black body to stabilize the temperature.

[0054] In one example, see Figure 1 The spectral imaging control system further includes: a power control module. The power control module is respectively connected to the optical path switching module, the interferometer, the amplifier, the acquisition module, the temperature controller and the refrigerator driver.

[0055] The power control module is mainly responsible for providing power, output control and module status detection for the above modules of the system; each of the above modules requires a different voltage, and the power control module supplies it to the above modules through DC / DC conversion.

[0056] In one example, the optical path switching module specifically includes: a reflector, a drive motor and a rotating drum. The reflector is fixed on the rotating drum; the rotating drum is connected to the drive motor; the drive motor is used to drive the rotating drum to rotate to change the direction of the reflector; during radiation calibration, the reflector faces the black body, and during measurement, the reflector faces the external environment.

[0057] In practical applications, the working process of the above spectral imaging control system is as follows:

[0058] The system modulates the input light through the interferometer to obtain interference data, converts the analog signal into a digital signal through the acquisition module, and transmits it to the host computer; the host computer converts the original interference pattern data into original spectral data through FFT, and obtains spectral radiation data through radiation calibration of the original spectral data, which is saved as target characteristic data.

[0059] Specifically, the external light of the system enters from the light entrance, passes through the optical path switching module to the interferometer, the optical path switching module turns to the black body during radiation calibration, and turns to the external optical path during measurement, switching the measurement target back and forth between the external optical path and the black body. After the interferometer modulates the light, it is transmitted to the infrared detector. The infrared detector outputs an analog signal and enters the amplifier. The amplifier amplifies and filters the signal, and then outputs it to the acquisition module. The acquisition module converts the analog signal into a digital signal for analysis and calculation by the host computer. The host computer converts the interference pattern data converted by the acquisition module into original spectral data through FFT, performs radiation calibration on the original spectral data, obtains spectral radiation data, and saves it as target characteristic data.

[0060] The spectral imaging control system of this embodiment is a control system for spectral imaging of both medium and long-wave infrared. It interferes with light through an interferometer, detects interference pattern signals by a cooling infrared detector, and samples the data through an acquisition module, which transmits the data to a host computer for calculation and processing. The power control module is responsible for power supply and status detection, and is equipped with a black body as a standard source. The above designed experiments are used to interfere, convert, amplify, sample and analyze external light. This spectral imaging control system has the following advantages:

[0061] Controlling the power output, interferometer, and monitoring the temperature of the black body and Stirling refrigerator are one of the key points of this embodiment. The power control module correctly controls the power output timing and voltage output value, and issues commands through the host computer to power on or off each module; the refrigerator accurately controls the cooling temperature, the interferometer interferes with the light, and the black body is used as the reference source. When the light path is switched to the black body, the temperature controller adjusts the black body temperature. After the temperature stabilizes, the interference pattern data of the black body is taken as the standard for subsequent comparison.

[0062] The device modulates the input light through the interferometer to obtain interference data, converts the analog signal into a digital signal through the acquisition board, and transmits it to the host computer; the host computer converts the original interference pattern data into original spectral data through FFT, and obtains spectral radiation data through radiation calibration of the original spectral data, which is saved as target characteristic data, realizing precise control of spectral imaging.

[0063] In order to implement the system corresponding to the above embodiment 1 and obtain corresponding functions and technical effects, a spectral imaging control method is provided below, and the spectral imaging control method includes:

[0064] (1) Controlling the optical path switching module to turn to the black body so that the reference light emitted by the black body enters the interferometer, the interferometer modulates the reference light to obtain reference interference light, the infrared detector detects the reference interference light to obtain a reference interference pattern analog signal, the amplifier amplifies and filters the reference interference pattern analog signal to obtain an amplified reference interference pattern analog signal, the acquisition module converts the amplified reference interference pattern analog signal into a digital signal to obtain a reference interference pattern digital signal, and the host computer performs FFT transformation on the reference interference pattern digital signal to obtain reference spectrum data and stores it.

[0065] (2) After obtaining the reference spectrum data, the optical path switching module is controlled to turn to the external environment so that the external light enters the interferometer, the interferometer modulates the external light to obtain the measurement interference light, the infrared detector detects the measurement interference light to obtain the measurement interference pattern analog signal, the amplifier amplifies and filters the measurement interference pattern analog signal to obtain the amplified measurement interference pattern analog signal, the acquisition module converts the amplified measurement interference pattern analog signal into a digital signal to obtain the measurement interference pattern digital signal, the host computer performs FFT transformation on the measurement interference pattern digital signal to obtain the measurement spectrum data, and uses the stored reference spectrum data to perform radiation calibration on the measurement spectrum data to obtain radiation spectrum data; the radiation spectrum data is used to determine the infrared radiation characteristics of the target in the external environment.

[0066] In one example, before step (1), the method further includes:

[0067] The refrigerator is controlled to provide a working environment with a set temperature for the infrared detector, and the set temperature is 77K.

[0068] A temperature controller is used to control the temperature of the black body so that the temperature of the black body is in a stable state.

[0069] The power control module is controlled to supply power according to the voltage required by the optical path switching module, the interferometer, the amplifier and the acquisition module.

[0070] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the method disclosed in the embodiment, since it corresponds to the system disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the system part description.

[0071] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A spectral imaging control system, characterized in that: include: Optical path switching module, black body, interferometer, infrared detector, amplifier, acquisition module and host computer; The optical path switching module is used to turn to the black body during radiation calibration so that the reference light emitted by the black body enters the interferometer, and to turn to the external environment during measurement so that the external light enters the interferometer; The interferometer is used to modulate the reference light to obtain reference interference light, and modulate the external light to obtain measurement interference light; The infrared detector is used to detect the reference interference light to obtain a reference interference pattern analog signal, and to detect the measurement interference light to obtain a measurement interference pattern analog signal; The amplifier is connected to the infrared detector; the amplifier is used to amplify and filter the reference interference pattern analog signal to obtain an amplified reference interference pattern analog signal, and to amplify and filter the measurement interference pattern analog signal to obtain an amplified measurement interference pattern analog signal; The acquisition module is connected to the amplifier; the acquisition module is used to convert the amplified reference interference pattern analog signal into a digital signal to obtain a reference interference pattern digital signal, and convert the amplified measurement interference pattern analog signal into a digital signal to obtain a measurement interference pattern digital signal; The host computer is connected to the acquisition module; the host computer is used to perform FFT transformation on the reference interference pattern digital signal to obtain reference spectrum data, perform FFT transformation on the measurement interference pattern digital signal to obtain measurement spectrum data, and use the reference spectrum data to perform radiation calibration on the measurement spectrum data to obtain radiation spectrum data; the radiation spectrum data is used to determine the infrared radiation characteristics of the target in the external environment.

2. The spectral imaging control system according to claim 1, characterized in that: Also includes: Chillers and chiller drivers; The refrigerator is connected to the refrigeration driver and the infrared detector respectively; The refrigeration driver is used to control the refrigeration capacity output by the refrigerator; The refrigerator is used to provide a working environment with a set temperature for the infrared detector.

3. The spectral imaging control system according to claim 1, characterized in that: Also includes: Thermostat; The thermostat is connected to the black body; the thermostat is used to control the temperature of the black body.

4. The spectral imaging control system according to claim 1, characterized in that: Also includes: Power control module; The power control module is connected to the optical path switching module, the interferometer, the amplifier and the acquisition module respectively.

5. The spectral imaging control system according to claim 1, characterized in that: The optical path switching module specifically includes: a reflector, a drive motor and a rotating drum; The reflector is fixed on the rotating drum; the rotating drum is connected to the driving motor; the driving motor is used to drive the rotating drum to rotate so as to change the direction of the reflector; during radiation calibration, the reflector faces the black body, and during measurement, the reflector faces the external environment.

6. The spectral imaging control system according to claim 2, characterized in that: The set temperature is 77K.

7. A spectral imaging control method, characterized in that: The spectral imaging control method is used for the spectral imaging control system according to any one of claims 1 to 6, and the spectral imaging control method comprises: Controlling the optical path switching module to turn to the black body, so that the reference light emitted by the black body enters the interferometer, the interferometer modulates the reference light to obtain the reference interference light, the infrared detector detects the reference interference light to obtain the reference interference pattern analog signal, the amplifier amplifies and filters the reference interference pattern analog signal to obtain the amplified reference interference pattern analog signal, the acquisition module converts the amplified reference interference pattern analog signal into a digital signal to obtain the reference interference pattern digital signal, and the host computer performs FFT transformation on the reference interference pattern digital signal to obtain the reference spectrum data and store it; After obtaining the reference spectrum data, the optical path switching module is controlled to turn to the external environment so that the external light enters the interferometer, the interferometer modulates the external light to obtain the measurement interference light, the infrared detector detects the measurement interference light to obtain the measurement interference pattern analog signal, the amplifier amplifies and filters the measurement interference pattern analog signal to obtain the amplified measurement interference pattern analog signal, the acquisition module converts the amplified measurement interference pattern analog signal into a digital signal to obtain the measurement interference pattern digital signal, the host computer performs FFT transformation on the measurement interference pattern digital signal to obtain the measurement spectrum data, and uses the stored reference spectrum data to perform radiation calibration on the measurement spectrum data to obtain radiation spectrum data; the radiation spectrum data is used to determine the infrared radiation characteristics of the target in the external environment.

8. The spectral imaging control method according to claim 7, characterized in that: Before controlling the optical path switching module to turn to the black body so that the reference light emitted by the black body enters the interferometer, the method further includes: The refrigerator is controlled to provide a working environment of a set temperature for the infrared detector.

9. The spectral imaging control method according to claim 7, characterized in that: Before controlling the optical path switching module to turn to the black body so that the reference light emitted by the black body enters the interferometer, the method further includes: A temperature controller is used to control the temperature of the black body so that the temperature of the black body is in a stable state.

10. The spectral imaging control method according to claim 7, characterized in that: Before controlling the optical path switching module to turn to the black body so that the reference light emitted by the black body enters the interferometer, the method further includes: The power control module is controlled to supply power according to the voltage required by the optical path switching module, the interferometer, the amplifier and the acquisition module.

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