Terahertz wave detection device, terahertz wave detection method and terahertz wave detection system

Abstract

The present invention provides a terahertz wave detection device, comprising: a terahertz wave transceiver, which includes a transmitter for emitting terahertz waves, and a receiver for receiving reflected terahertz waves reflected by a background reflector located behind an analysis object; a display; and an information processing device, wherein the transmitter irradiates a terahertz wave to a two-dimensional area including the analysis object, wherein the terahertz wave is generated based on a transmission signal including a specific frequency, and the information processing device analyzes the concentration of the analysis object based on the reflected terahertz wave, generates a composite image obtained by synthesizing the concentration image of the analysis object on the image of the background reflector, and displays the composite image on the display.

Description

Technical Field

[0001] The invention relates to a terahertz wave detection device, a terahertz wave detection method and a terahertz wave detection system. Background Art

[0002] It is known that various VCO gases and the like exhibit characteristic frequency absorption spectra in the range of terahertz waves (0.1THz to 10THz, hereinafter referred to as "THz waves"). In addition, it is known that the wavelength of THz waves is longer than that of infrared light and is not easily affected by aerosols. Therefore, non-patent document 1 discloses a study in which the properties of THz waves are used to apply THz waves to the analysis of VCO gases.

[0003] Prior art literature

[0004] Non-patent literature

[0005] Non-patent document 1

[0006] Gapless THz comb spectroscopy (Laser Research, Vol. 42, No. 9, pp. 1-6, September 2014) Summary of the invention

[0007] Technical problem to be solved by the invention

[0008] Non-patent document 1 mentions how to generate terahertz waves without spectral gaps, but does not mention how to display the results of analysis using THz waves. The wavelength of terahertz waves is longer than that of visible light, and when the received terahertz waves are converted into images, the resolution of visible light images cannot be obtained. Therefore, there is room for further improvement in displaying the results of analysis using THz waves as images.

[0009] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a display technology that can make the analysis results of terahertz waves easy to observe.

[0010] Technical means of solving problems

[0011] In order to solve the above-mentioned problem, the terahertz wave detection device of the present invention is characterized in that it includes: a terahertz wave transceiver, which includes a transmitter for emitting terahertz waves, and a receiver for receiving reflected terahertz waves reflected by a background reflector located behind an analysis object; a display; and an information processing device respectively connected to the terahertz wave transceiver and the display, wherein the transmitter irradiates a terahertz wave to a two-dimensional area including the analysis object, wherein the terahertz wave is generated based on a transmission signal including a specific frequency, and the information processing device includes: an analysis unit for analyzing the concentration of the analysis object based on the reflected terahertz wave; and a visualization unit, which generates a composite image obtained by synthesizing the concentration image of the analysis object on a background image captured by taking the background reflector based on the analysis result of the analysis unit, and displays the composite image on the display.

[0012] Effects of the Invention

[0013] According to the present invention, it is possible to provide a display technology that makes it easy to observe the analysis results of terahertz waves. In addition, technical objectives, technical features and effects other than those described above will be clarified by the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1A It is a front view of the THz wave detection device according to the first embodiment.

[0015] Figure 1B It is a side cross-sectional view of the THz wave detection device according to the first embodiment.

[0016] Figure 2 It is a hardware configuration diagram of the THz wave detection device according to the first embodiment.

[0017] Figure 3 This is a functional block diagram of the THz wave detection device according to the first embodiment.

[0018] Figure 4A It is a diagram for explaining the transmission signal and the reception signal of THz waves.

[0019] Figure 4B It is a graph showing the signal strength of the received signal.

[0020] Figure 5 It is a flowchart showing the working process of the THz wave detection device.

[0021] Figure 6 This is a diagram illustrating a method of visualizing gas.

[0022] Fig. 7A This is a diagram showing an example of image synthesis processing.

[0023] Figure 7BThis is a diagram showing an example of image synthesis processing.

[0024] Figure 8 This is an external view of a THz wave detection device according to the second embodiment.

[0025] Fig. 9 It is the functional structure diagram of the controller.

[0026] Fig.10 It is a diagram showing an application example of the THz wave detection device according to the second embodiment.

[0027] Fig.11A This is a diagram showing the relationship between the distance between the THz wave detection device and the analysis target gas.

[0028] Fig. 11B This is a diagram showing the relationship between the distance between the THz wave detection device and the analysis target gas.

[0029] Fig.12 This is a flowchart showing the processing flow of the THz wave detection device according to the third embodiment, particularly the gas visualization application unit.

[0030] Fig.13A This is a diagram for explaining a characteristic quantity indicating a temporal change in the concentration distribution of the analysis target gas.

[0031] Fig. 13B This is a diagram showing an example of a concentration distribution map.

[0032] Fig.14 A diagram showing a synthesized image.

[0033] Fig.15 : is a flowchart showing the processing flow of the gas visualization application unit according to the fourth embodiment.

[0034] Fig.16A It is a front view of the THz wave detection device of the fifth embodiment.

[0035] Fig. 16B It is a side cross-sectional view of a THz wave detection device according to a fifth embodiment.

[0036] Fig.17 This is a flowchart showing the processing flow of the gas visualization application unit according to the fifth embodiment. DETAILED DESCRIPTION

[0037] The following describes the embodiments of the present invention with reference to the accompanying drawings. In the following description, the same structures and processing steps are denoted by the same reference numerals to omit repeated descriptions.

[0038] [First embodiment]

[0039] In the first embodiment, an example in which the THz wave detection device 100 is applied to a gas visualization device will be described. Figure 1A It is a front view of the THz wave detection device according to the first embodiment. Figure 1B It is a side cross-sectional view of the THz wave detection device according to the first embodiment. Figure 2 It is a hardware configuration diagram of the THz wave detection device according to the first embodiment.

[0040] Figure 1A The THz wave detection device 100 shown is formed by connecting a THz wave transceiver 1 to a smartphone 10 as an information processing device. The information processing device may also be other portable information terminals, such as a tablet terminal. In addition, the THz wave detection device 100 may also be formed by connecting a THz wave transceiver 1 to a computer.

[0041] like Figure 1B As shown, the smartphone 10 has an expansion I / F (interface) 125 , and the THz wave transceiver 1 is connected to the expansion interface 125 .

[0042] The smartphone 10 is provided with a display 141 and a front camera 143 on the front. Furthermore, the smartphone 10 is provided with a rear camera 144 on the back. In addition, the smartphone 10 accommodates a processor 107 inside the housing.

[0043] Figure 2 1 is a block diagram showing an example of the internal structure of the smartphone 10. Figure 2 In the figure, the smartphone 10 is composed of a CPU (Central Processing Unit) 101, a system bus 102, a ROM (Read Only Memory) 103, a RAM (Random Access Memory) 104, a storage unit 110, a communication processor 120, an expansion interface 125, an operator 130, a video processor 140, an audio processor 150, and a sensor 160.

[0044] The CPU 101 is a microprocessor unit that controls the entire smartphone 10 . The system bus 102 is a data communication path for transmitting and receiving data between the CPU 101 and each operation module in the smartphone 10 .

[0045] ROM 103 is a memory that stores basic operating programs such as an operating system and other operating programs. For example, an erasable ROM such as EEPROM (Electrically Erasable and Programmable Read Only Memory) or a flash ROM is used. RAM 104 is a work area when the basic operating programs and other operating programs are executed. ROM 103 and RAM 104 may also be integrated with CPU 101. In addition, ROM 103 may not be used. Figure 2 The processor 107 is not an independent structure as shown, but uses a part of the storage area in the storage unit 110. The processor 107 is composed of a CPU 101, a ROM 103, a RAM 104, and a storage unit 110 connected via a system bus 102.

[0046] The storage unit 110 stores an operation program and operation setting values ​​of the smartphone 10 , images captured by the smartphone 10 , information on the user of the smartphone 10 , and the like.

[0047] The functions of ROM 103 may be replaced in whole or in part by a part of the area of ​​storage unit 110. In addition, storage unit 110 needs to be able to retain stored information even when power is not supplied from the outside to smartphone 10. Therefore, for example, a flash ROM, SSD (Solid State Drive), HDD (Hard Disk Drive) or the like is used.

[0048] The above-mentioned operating programs stored in the ROM 103 and the storage unit 110 can be updated and their functions expanded by downloading data from various server devices (not shown) on a wide area public network.

[0049] The communication processor 120 includes a LAN (Local Area Network) communicator 121, a telephone network communicator 122, an NFC (Near Field Communication) communicator 123, and a Bluetooth (registered trademark) communicator 124. The LAN communicator 121 is connected to a wide area public network via an access point (AP) device (not shown) through a wireless connection based on Wi-Fi (registered trademark) or the like, and transmits and receives data with each server device on the wide area public network. The telephone network communicator 122 performs telephone communication (calls) and data transmission and reception through wireless communication with a base station (not shown) of a mobile phone communication network. The NFC communicator 123 performs wireless communication when it is close to a corresponding reader / writer. The Bluetooth communicator 124 transmits and receives data with a corresponding terminal through wireless communication. The LAN communicator 121, the telephone network communicator 122, the NFC communicator 123, and the Bluetooth communicator 124 each include an encoding circuit and a decoding circuit, an antenna, and the like. In addition, the communication processor 120 may further include infrared communication and other communicators.

[0050] The expansion interface 125 is an interface group for expanding the functions of the smart phone 10. In the present embodiment, it is composed of an image / sound interface, a USB (Universal Serial Bus) interface, a memory interface, etc. The image / sound interface is used, for example, to input image signals / sound signals from an external image / sound output device, and to output image signals / sound signals to an external image / sound input device. The USB interface is used to connect to a PC (Personal Computer) or the like for data transmission and reception. In addition, a keyboard and other USB devices can also be connected. The memory interface is used to connect a memory card and other memory media for data transmission and reception.

[0051] The operator 130 is an instruction input device for inputting operation instructions to the smartphone 10, and in this embodiment, it is composed of a touch panel overlapped with the display 141 and an operation key arranged with a push button switch. However, only one of them may be used, and the smartphone 10 may be operated using a keyboard connected to the expansion interface 125. In addition, the smartphone 10 may be operated using another portable terminal device connected by wired communication or wireless communication. In addition, the function of the above-mentioned touch panel may also be possessed by the display 141.

[0052] The video processor 140 is composed of a display 141, an image signal processor 142, a front camera 143, and a rear camera 144. The front camera 143 is a camera disposed on the same surface (front) as the display 141, and is used, for example, for so-called self-portraits, that is, taking a picture while checking one's own face photographed by the front camera 143 using the display 141. The rear camera 144 is a camera disposed on the side opposite to the display 141 (rear).

[0053] The display 141 is a display device such as a liquid crystal panel, and displays the image data processed by the image signal processor 142 and provides it to the user of the smartphone 10. The image signal processor 142 includes a graphic RAM (not shown), and drives the display 141 based on the image data input to the graphic RAM. In addition, the image signal processor 142 has functions such as format conversion and superimposition processing of menus and other OSD (On-Screen Display) signals as needed. The front camera 143 and the rear camera 144 are camera units that function as camera devices, and use electronic devices such as CCD (Charge-Coupled Device) and CMOS (Complementary Metal Oxide Semiconductor) sensors to convert light input through the lens into electrical signals to input image data of the surroundings and objects.

[0054] The audio processor 150 includes a speaker 151, a sound signal processor 152, and a microphone 153. The speaker 151 provides a sound signal processed by the sound signal processor 152 to a user of the smartphone 10. The microphone 153 converts the user's voice and the like into sound data and inputs it.

[0055] The sensor 160 is a sensor group for detecting the state of the smartphone 10. In the present embodiment, it includes a GPS (Global Positioning System) receiver 161, a gyro sensor 162, a geomagnetic sensor 163, an acceleration sensor 164, an illumination sensor 165, and a human body sensor 166. These sensor groups can detect the position, inclination, orientation, movement, and surrounding brightness of the smartphone 10. In addition, the smartphone 10 may further include other sensors such as an air pressure sensor and a pressure sensor. Although the location information is obtained through the GPS receiver 161, when the location information cannot be obtained in a place where the GPS radio waves are difficult to reach, the location information can be obtained through the LAN communicator 121 based on the location information of the Wi-Fi AP device, and the location information can also be obtained through the telephone network communicator 122 based on the base station information.

[0056] Figure 2 The configuration example of the smartphone 10 shown includes a large number of structures that are not essential in this embodiment, such as the communication processor 120, and even if these structures are not included, the effect of this embodiment is not impaired. In addition, it may further include structures such as a digital broadcast receiving function and an electronic money payment function that are not shown.

[0057] Figure 3 1 is a functional block diagram of the THz wave detection device 100 according to the first embodiment. The THz wave detection device 100 is configured by connecting the THz wave transceiver 1 and the rear camera 144 to the input stage of the processor 107 and connecting the display 141 to the output stage of the processor 107 .

[0058] The processor 107 mainly includes an analysis unit 2 and a visualization unit 4. The analysis unit 2 and the visualization unit 4 are configured by hardware constituting the processor 107 executing software that realizes the functions of the THz wave detection device 100.

[0059] The THz wave transceiver includes a transmitter 11 , a receiver 12 , a transmission control section 13 , and an antenna 14 .

[0060] The THz wave transceiver 1 irradiates the three-dimensional space including the analysis target gas 6 with the antenna 14 attached to the THz wave transceiver 1 with a transmission wave 15a. The analysis target gas 6 absorbs a specific frequency spectrum. In addition, the antenna 14 receives the reflected terahertz wave 15b reflected by the background reflector 5 after passing through the analysis target gas 6.

[0061] The transmission control unit 13 controls the transmitter 11 to output the THz wave (transmission signal) obtained by the spectrum frequency sweep. The transmitter 11 converts the transmission signal into a transmission wave 15a (THz wave) and irradiates the two-dimensional area including the analysis target gas 6 from the antenna 14. The receiver 12 obtains the reflected terahertz wave 15b received by the antenna 14, converts it into a reception signal and sends it to the analysis unit 2.

[0062] The irradiation of the transmission wave 15a in the two-dimensional region is performed in such a way that the irradiation direction is scanned horizontally or vertically for each unit, with the frequency sweep period of the spectrum frequency as one unit. The scanning method of the irradiation direction can be either a mechanical method, such as using a galvanometer, or an electrical method, such as using a phased array antenna in which a plurality of antenna elements are arranged in an array shape so that the phase of the THz wave signal input to each antenna element is different. The synchronization signal of the scanning is shared with the visualization unit 4.

[0063] The analysis unit 2 includes a frequency difference detector 21 , a detector 22 , a frequency detector 23 , a reflection distance calculation unit 24 , a reference intensity detection unit 25 , an attenuation detection unit 26 , a normalized concentration calculation unit 27 , an attenuation ratio calculation unit 28 , and a gas identification unit 29 .

[0064] On the other hand, the visualization unit 4 includes a depth image generating unit 41 , a density image generating unit 42 , a graphic image generating unit 43 , and an image synthesizing unit 44 .

[0065] The frequency difference detector 21 obtains a frequency difference Δf0 between the transmission signal and the reception signal based on an interference signal between the transmission signal and the reception signal, and outputs the frequency difference Δf0 to the reflection distance calculation unit 24 .

[0066] The reflection distance calculation unit 24 calculates the reflection distance d between the antenna 14 and the background reflector 5 based on Δf0, and outputs the reflection distance d to the normalized density calculation unit 27 and the depth image generation unit 41 respectively.

[0067] The detector 22 detects the envelope of the received signal and outputs it to the reference intensity detection unit 25 and the attenuation detection unit 26 respectively.

[0068] The reference intensity detection unit 25 detects the reference intensity R in the frequency band where the analysis target gas 6 does not perform spectral absorption of the THz wave based on the envelope of the received signal. The reference intensity detection unit 25 outputs the reference intensity R to the attenuation ratio calculation unit 28 .

[0069] Based on the envelope of the received signal, the attenuation detection unit 26 detects a depression of the envelope at a specific frequency where the analysis target gas 6 absorbs spectrally, and detects the attenuation S from the amount of the depression. The attenuation detection unit 26 outputs the attenuation S to the attenuation ratio calculation unit 28 .

[0070] Furthermore, the attenuation detection unit 26 outputs the occurrence time (timing) of the notch to the frequency detector 23. The frequency detector 23 detects the frequency f1 of the reception signal at which the notch occurs, and outputs it to the gas identification unit 29.

[0071] The gas identification unit 29 identifies the type of gas having the frequency f1 of the absorption spectrum and outputs the result to the graphic image generation unit 43 .

[0072] The attenuation ratio calculation unit 28 calculates the attenuation ratio R / S based on the reference intensity R and the attenuation amount S, and outputs the calculated attenuation ratio to the normalized concentration calculation unit 27 .

[0073] The normalized density calculation unit 27 calculates the normalized density R / S / d obtained by dividing the attenuation ratio R / S by the reflection distance d. The normalized density calculation unit 27 outputs the normalized density R / S / d to the density image generation unit 42 .

[0074] The rear camera 144 includes a camera unit 1441 and a camera control unit 1442. The camera unit 1441 includes, for example, a camera device such as a CMOS sensor and a camera lens. The camera unit 1441 captures a visible light or infrared light image of a two-dimensional area irradiated by the THz wave. The camera control unit 1442 converts the signal from the camera unit 1441 into an RGB signal. In addition, a part of the shooting area can also correspond to the irradiation area of ​​the THz wave signal. The front camera 143, like the rear camera 144, includes a camera unit 1431 and a camera control unit 1432. An implementation using the front camera 143 is described in the third implementation.

[0075] The depth image generation unit 41 takes the reflection distance d as input, and converts the reflection distance d into monochrome brightness or the like in synchronization with scanning in the THz wave irradiation direction, thereby generating a two-dimensional image.

[0076] The concentration image generating unit 42 takes the standardized concentration R / S / d as input, converts the standardized concentration R / S / d into monochrome brightness or maps it to a specified color, etc. in synchronization with the scanning in the THz wave irradiation direction, thereby generating a two-dimensional image.

[0077] The graphic image generating unit 43 obtains text data as gas type information, and further converts the text data into graphic image data to obtain a graphic image.

[0078] The image synthesis unit 44 receives the depth image, the density image, the pattern image, and the captured image as input, synthesizes these images, and outputs them to the display 141 .

[0079] Figure 4A , B is a diagram for explaining a method for analyzing gas and odor, and is mainly related to the THz wave transceiver 1 and the analysis unit 2 of FIG. 1 .

[0080] Figure 4A 1 is a diagram for explaining a transmission signal 201 and a reception signal 202 of a THz wave, wherein the transmission wave 15 a and the reflected terahertz wave 15 b are located inside and outside the antenna 14 , respectively. Figure 4A The transmitted signal 201 and the received signal 202 are shown on three axes: time, signal strength, and frequency.

[0081] The transmission signal 201 shown by the dotted line performs a frequency sweeping action of gradually changing the frequency in the THz band while maintaining a constant signal strength at each unit time Tm. The frequency range of the frequency sweep is B. After completing a unit of frequency sweeping, the transmission signal 201 performs the next frequency sweeping action, but the irradiation position will become different with the scanning of the irradiation direction mentioned above.

[0082] The received signal 202 shown by the solid line is slightly delayed relative to the transmitted signal 201. This is caused by the reciprocating reflection distance d. Due to this delay, when observed at the same time, there is a frequency difference Δf0 between the transmitted signal 201 and the received signal 202. In addition, the signal intensity of the received signal 202 is depressed at a specific frequency f1. This is because the spectral absorption of the analysis object gas 6 occurs at the frequency f1.

[0083] Figure 4B is a graph showing the signal strength of the received signal 202. Figure 4B As explained above, there is a notch at frequency f1. The reference intensity R is the signal intensity when the gas does not absorb the spectrum. This intensity is obtained by sampling the flat part at multiple points, avoiding the notch, and taking the average. The signal intensity S at the notch is the signal intensity attenuated by the spectral absorption of the gas, indicating the degree of gas absorption. The higher the gas concentration, the greater the attenuation and the smaller S. The attenuation rate caused by gas absorption is R / S.

[0084] The reflection distance calculation unit 24 calculates the reflection distance d according to the following equation (1).

[0085]

[0086] c: speed of light

[0087] The standardized concentration calculation unit 27 calculates the standardized gas concentration (also referred to as standardized concentration) according to the following formula (2).

[0088] Normalized gas concentration = R / S / d (2)

[0089] Figure 5 1 is a flowchart showing the operation of the THz wave detection device 100 .

[0090] When the THz wave detection device 100 is started, initial settings are performed (S10). The THz wave detection device 100 performs a series of processes including shooting processing (S11) performed using the rear camera 144 and measurement performed using the THz wave transceiver 1 in parallel, namely, controlling THz wave irradiation (S12), irradiating THz waves (S13) and receiving reflected terahertz waves (S14) on the analysis object (in this embodiment, an area where the analysis object gas is located). S12 to S14 are THz wave control processing S1, and control for irradiating THz waves to the object area is performed in S12. For example, the irradiation level of the THz wave, the time unit of the frequency sweep, the bandwidth, etc. are controlled. In S13, an instruction to perform THz wave irradiation is issued, and in S14, a detection signal of the reflected terahertz wave, that is, a detection signal of the received signal, is obtained.

[0091] After receiving the reflected terahertz wave (S14), the frequency difference detection process (S15) by the frequency difference detector 21, the reference strength detection process (S16) by the reference strength detection unit 25, the attenuation strength detection process (S17) by the attenuation detection unit 26, and the frequency detection process (S18) by the frequency detector 23 are performed in parallel. S15 to S25 constitute the analysis process S2.

[0092] After the frequency difference detection process (S15), the reflection distance calculation unit 24 performs a calculation process of the reflection distance d (S19), and records it in the RAM 104 and the storage unit 110 (S23). In addition, the reflection distance calculation unit 24 outputs the reflection distance d to the depth image generation unit 41, and the depth image generation unit 41 generates a depth image 51 (see Figure 6 )(S26).

[0093] After the reference intensity detection process (S16), the attenuation ratio calculation unit 28 performs a calculation process of the gas attenuation rate R / S (S20). Next, the standardized concentration calculation unit 27 performs a standardized concentration calculation process (S21), which is recorded in the RAM 104 and the storage unit 110 (S24). Furthermore, the standardized concentration calculation unit 27 outputs the standardized concentration R / S / d to the density image generation unit 42, and the density image generation unit 42 generates a density image 52 (see Figure 6 )(S27).

[0094] After the attenuation intensity detection process (S17), the frequency detector 23 detects the frequency f1 at the location where the depression (attenuation) occurs (S18), and based on the frequency f1, the gas identification unit 29 determines the type of gas, that is, identifies the components of the gas (S22), and records it in the RAM 104 and the storage unit 110 (S25). In addition, the gas identification unit 29 outputs the identification result of the components to the graphic image generation unit 43 as text data, and the graphic image generation unit 43 generates a graphic image 53 (refer to Figure 6 )(S28).

[0095] The rear camera 144 captures a background image ( S11 ) and obtains a captured image ( S29 ).

[0096] The image synthesis unit 44 acquires the depth image 51 , the density image 52 , the pattern image 53 , and the captured image 54 , synthesizes these four images ( S30 ), and displays them on the display 141 ( S31 ).

[0097] CPU 101 determines whether a certain condition is met, which is used to determine whether repeated processing is required, for example, whether scanning is completed or whether the application is continued. When it is determined that repetition is required (S32 / Yes), it returns to S11 and S12. When it is determined that repetition is not required (S32 / No), the processing ends.

[0098] Figure 6 This is a diagram illustrating a method of visualizing gas.

[0099] The depth image 51 is obtained by converting the reflection distance d into monochrome brightness and darkness in a manner synchronized with the scanning in the irradiation direction of the THz wave, and performing two-dimensional imaging. Since the wavelength of THz waves is longer than that of visible light, the fineness of the depth image 51 is poor compared to the camera image taken with visible light. The depth image 51 is an image obtained by visualizing the reflection distance d to the background reflector, and can observe the background obscured by aerosols, etc. Therefore, it can play a beneficial role in situations such as using it together with the camera image 54 to identify obstacles and emergency exits during emergency evacuation (refuge). Among them, the corresponding range can be pre-detected and stored for the relationship between the two-dimensional scanning range of the THz wave and the field of view angle of the camera image.

[0100] The gas concentration image 52 is also obtained by converting the standardized concentration R / S / d into a single-color brightness or color mapping in synchronization with the scanning direction of the THz wave irradiation, and then performing a two-dimensional image. By standardizing the gas concentration R / S by the reflection distance d, the danger of the gas can be visualized from the perspective of concentration and distance.

[0101] The graphic image 53 is obtained by converting text data of gas category information into graphic image data. In addition to the gas category, for example, warning information corresponding to the degree of danger and an auxiliary image that visualizes the change of gas over time in an easy-to-understand manner can also bring beneficial effects.

[0102] The captured image 54 is a captured image captured by the rear camera 144. Since it is an image obtained by imaging the visible light reflected by the background reflector 5, it is called a background image.

[0103] The composite display image 55 is an image obtained by synthesizing the depth image 51, the concentration image 52, the graphic image 53 and the camera image 54, and is a display image. The four images constitute the four layers of the composite image, and by adopting alpha blending as the synthesis method, an easy-to-observe composite image can be obtained. In addition, the depth image 51 and the camera image 54 can be used complementarily. In an environment such as an aerosol, when the camera image 54 is unstable, such a synthesis can be performed: the depth image 51 is used as the main display, or a part of the camera image 54 is replaced by the depth image 51. In addition, based on the camera image 54 and the depth image 51, special features such as the exit door on the camera image 54 and obstacles on the evacuation path can be identified and displayed.

[0104] The image synthesis unit 44 obtains the depth image 51, the concentration image 52, the graphic image 53, and the camera image 54. The camera image 54 is compared with the depth image 51 to obtain the subject distance of the camera image 54. Then, the image synthesis unit 44 compares the concentration image 52 with the depth image 51 to determine whether the gas 520 shown on the concentration image 52 is located on the outer side or the inner side compared to the subject of the camera image 54. Figure 6 In the synthetic display image 55, the distance from the THz wave detection device 100 to the chair in the depth image 51 is compared with the distance from the THz wave detection device 100 to the gas 520. Since the distance from the THz wave detection device 100 to the gas 520 is shorter, the image is drawn so that the gas 520 overlaps on the chair photographed in the depth image 51 and appears to be closer to the outside.

[0105] Fig. 7A , Figure 7B is a diagram showing an example of image synthesis processing. Fig. 7A , Figure 7B In the above, the concentration image 521 and the camera image 541 are the same image. On the other hand, the depth images 511 and 512 are different. In the depth image 511, there is a table at a position farther than the gas, while in the depth image 512, there is a table at a position closer than the gas. At this time, the image synthesis unit 44 Fig. 7A In the case of generating a synthetic display image 551 in which gas is drawn in front of the table. Figure 7B In this case, a composite display image 552 is generated in which gas is drawn on the back of the table.

[0106] As described above, the first embodiment can be used to visualize the position of the gas relative to the background image by superimposing the gas concentration image 52 on the background image obtained based on the depth image 51 or the camera image 54. The camera image 54 can obtain a high-resolution background image, and the depth image 51 can be used to confirm the background in an environment such as an aerosol, so the background image can be obtained in a variety of environments. Furthermore, this embodiment can be used not only for gas analysis, but also for analysis of places such as kitchens where unpleasant odors may occur.

[0107] [Second embodiment]

[0108] Reference Figures 8 to 10 The second embodiment is described. The second embodiment is an example in which the THz wave transceiver 1 is installed on the wearable terminal 300 to constitute the THz wave detection device 100a. The THz wave transceiver 1 can also be integrally formed in the wearable terminal 300. The user of the THz wave detection device 100a can use the THz wave detection device 100a while the THz wave detection device 100a is worn on the body, and can move both hands freely.

[0109] Figure 8 FIG. 1 is an external view of a THz wave detection device 100a according to the second embodiment. Figure 8 As shown, the THz wave detection device 100 a is configured by installing a THz wave transceiver 1 a and a camera 3 on a wearable terminal 300 .

[0110] The wearable terminal 300 includes: a top head holder 303 and a side head holder 304; a glasses-like optical part 302 arranged in front of the side head holder 304; a screen 305 arranged further in front of the glasses-like optical part 302; and an image projector 301 arranged on the top head holder 303.

[0111] The THz wave transceiver 1 a and the camera 3 are mounted on the top of the head holder 303 , for example.

[0112] Furthermore, the THz wave detection device 100 a includes a THz wave transceiver 1 a , a camera 3 , an image projector 301 , a glasses-type optical unit 302 , and a controller 7 b electrically connected or communicatively connected to a screen 305 .

[0113] The controller 7 is a component that omits the functions of the camera 3 and the display from the smartphone 10. The screen 305, the image projector 301, and the glasses-type optical part 302 correspond to the display 141. In addition, the top of the head holder 303 and the side of the head holder 304 are used to wear the camera 3, the THz wave transceiver 1a, and the display on the head of the user of the THz wave detection device 100a.

[0114] The image projector 301 projects the synthesized display image 55 onto the screen 305. At this time, the depth image 51 can be displayed in 3D with a sense of distance according to the reflection distance d. Therefore, the synthesized display image 55 is composed of the observation image for the left eye and the observation image for the right eye. In addition, the electronic shutter 102a (see FIG. 1 ) is built into the eyeglass optical unit 302. Fig. 9 ), when projecting the observation image for the left eye, the glasses-type optical unit 302 controls the left eye side to a transmission state, and controls the right eye side to a light-shielding state using an electronic shutter. When projecting the observation image for the right eye, the glasses-type optical unit 302 controls the right eye side to a transmission state, and controls the left eye side to a light-shielding state using an electronic shutter.

[0115] The screen 305 may also be a semi-transmissive screen. In this case, the synthesized display image 55 does not include the camera image 54. The background image seen through the semi-transmissive screen 305 is viewed together with the synthesized display image 55 composed of at least one of the depth image 51, the concentration image 52, and the graphic image 53 projected onto the semi-transmissive screen 305 by the image projector 301. The camera image 54 is used for alignment when obtaining the synthesized display image 55. The user can view the real image of the background through the semi-transmissive screen 305 and use the THz wave detection device 100a safely at the same time.

[0116] Fig. 9 7 is a functional block diagram of the controller 7. The controller 7 includes a CPU 71, a RAM 72, a FROM 73, an SDI / F 74a, an SD memory 74b, a communication I / F 75, a graphics processor 76, a display 45a with a touch panel, a USB (R) I / F 77, and an optical system control unit 78. The USB (R) I / F 77 is connected to the THz wave transceiver 1a and the camera 3. In addition, the optical system control unit 78 is connected to the electronic shutter 102a to control the opening and closing of the electronic shutter 102a.

[0117] The THz wave transceiver 1 a includes a USB I / F 14 .

[0118] The controller loads the program stored in FROM73 into RAM72, and the program is executed by CPU71. In FROM73, as programs related to the analysis and visualization of gas and odor, there are THz wave control processing unit 731, camera control processing unit 732, analysis processing unit 733, visualization processing unit 734, and gas visualization application (abbreviation of application program) unit 735. Here, THz wave control processing unit 731 is related to Figure 3 The camera control processing unit 732 is related to the operation of the THz wave transceiver 1, especially the transmission control unit 13. Figure 3The analysis processing unit 733 is related to the operation of the camera control unit 1432 or 1442 of the front camera 143 or the rear camera 144. Figure 3 The visualization processing unit 734 and the gas visualization application unit 735 are equivalent to Figure 3 Visualization section 4.

[0119] After being started, the gas visualization application unit 735, in addition to managing the user interface, also calls the THz wave control processing unit 731, the camera control processing unit 732, the analysis processing unit 733, and the visualization processing unit 734 to perform analysis and visualization of gas and odor.

[0120] SD memory 74b stores application data and the like, and exchanges data with CPU 71 via SDI / F 74a. Communication I / F 75 is a communication interface such as 3G or 4G mobile communication or wireless LAN, and is connected to a server (not shown) through the interface. Controller 7 can make a part of the program it executes be executed by the server to reduce its own processing load.

[0121] The graphic processor 76 generates an image displayed on the display screen of the display with touch panel 45a based on the application data generated by the program. In addition, it also imports and displays the camera image data obtained by the camera 3. In addition, the display with touch panel 45a has not only a display screen but also a touch panel as a user input operation unit.

[0122] USBI / F77 is a serial bus interface that connects the controller 7 to the THz wave transceiver 1a and the camera 3 respectively.

[0123] The THz wave transceiver 1a is obtained by making the THz wave transceiver 1 of the first embodiment have a USBI / F 14. Data is transmitted and received between the USBI / F 14 and the USBIF 77 of the controller 7. At this time, what is transmitted and received may not be the THz wave reception signal, but, for example, the envelope obtained by detection may be digitized and the digital data may be transmitted and received.

[0124] Fig.10 It is a diagram showing an application example of the THz wave detection device 100 a according to the second embodiment. Fig.10 The difference between the THz wave detection device 100b and the THz wave detection device 100a is that the THz wave transceiver 1 and the camera 3 are built into or installed closely on the THz wave detection device 100a, and they are integrated. The THz wave detection device 100b includes an opening 31a of the camera 3 and an antenna 14a of the THz wave transceiver 1. The THz wave detection device 100b also has a built-in controller 7a.

[0125] The THz wave detection device 100 b transmits and receives a communication signal 75 a , and is communicatively connected to a server device 92 via a network 91 through a communication base station 90 .

[0126] In the server device 92, a part of the program to be executed by the controller 7 can be executed by the server device 92 to reduce the processing load of the controller 7a. For example, the frequency f1 of the absorption spectrum can be notified to the server device 92, and the gas type corresponding to the frequency f1 can be identified using the database in the server device 92, and the result can be sent back to the controller 7a.

[0127] Alternatively, the depth image 51 and the captured image 54 may be sent to the server device 92 so that the server device 92 can recognize the characteristic portion of the background image.

[0128] In addition, the server device 92 can also be used to identify the degree of danger in response to the alarm issued by the controller 7a, notify the police and fire department, and prompt the controller 7a with a specific plan for evacuation instructions.

[0129] As described above, according to the second embodiment, a gas and odor visualization device can be realized using general-purpose information equipment.

[0130] [Third Embodiment]

[0131] Reference Fig.11A , Fig. 11B and Fig.12 The third embodiment is described below. The third embodiment is characterized in particular by the function of measuring the distance to the gas.

[0132] Fig.11A 1 is a diagram showing the relationship between the distance between the THz wave detection device 100 b and the analysis target gas 6 .

[0133] Fig.11A The telescopic device 80 includes a handle 83, a telescopic rod 82 with a retractable length installed at one end thereof, and a support platform 81 installed on the front end side of the telescopic rod 82 (the side opposite to the handle 83). The THz wave detection device 100b is fixed on the support platform 81. The user holds the handle 83 to adjust the length of the telescopic rod 82, and uses the THz wave detection device 100b installed on the support platform 81 to measure the analysis object gas 6 and visualize it. By changing the length of the telescopic rod 82, the distance between the THz wave detection device 100b and the analysis object gas 6 can be changed. Here, together with the measurement data, it is also obtained whether the telescopic rod 82 is in an extended state or a contracted state.

[0134] Fig. 11B 1 is a diagram showing the relationship between the distance between the THz wave detection device 100 b and the analysis target gas 6 .

[0135] At position P1 of the THz wave detection device 100b, the telescopic rod 82 is in a retracted state, and the opening angle facing the analysis target gas 6 is θ1. On the other hand, at position P2 of the THz wave detection device 100b, the telescopic rod 82 is in an extended state, and the distance to the analysis target gas 6 is shortened by the analysis distance difference l, and the opening angle facing the analysis target gas 6 is θ2. At this time, the distance Lg to the analysis target gas 6 is given by equation (3).

[0136]

[0137] Fig.12 1 is a flowchart showing the processing flow of the THz wave detection device 100 b according to the third embodiment, particularly the gas visualization application unit 735 .

[0138] The gas visualization application unit 735 starts up and performs initial settings (S10), and then performs THz wave control processing (S1) and analysis processing S2. At this time, the telescopic rod 82 is in a contracted state, and a first concentration image of the analysis target gas 6 is generated (S34).

[0139] Then, the user extends the telescopic rod 82 to change the measurement distance ( S35 ), and executes the THz wave control process ( S1 ) and the analysis process S2 again.

[0140] Then, the visualization processing unit 734 generates a second concentration image of the analysis target gas 6 ( S36 ).

[0141] The analysis processing unit 733 calculates the above-mentioned equation (3) to obtain the distance Lg to the gas (S37).

[0142] Next, the analysis processing unit 733 calculates the normalized concentration R / S / Lg again ( S38 ).

[0143] The analysis processing unit 733 records the normalized density R / S / Lg (S24) and obtains a third density image (S39). S34 to S38 constitute the first expansion process S4 of the analysis process S2.

[0144] The visualization processing unit 734 generates the depth image 51 (S26), the graphic image 53 (S28), and the camera image 54 (S29) in addition to the third density image (S39). The third density image is used with at least one of the depth image 51, the graphic image 53, and the camera image 54 to perform image synthesis processing (S30), and the synthesized display image 55 is displayed (S31). If the repetition condition is satisfied (S32 / Yes), a series of processing is repeated, and if the repetition condition is not satisfied (S32 / No), the processing is terminated.

[0145] As described above, according to the third embodiment, when normalizing the gas concentration, the distance Lg to the gas to be analyzed is used instead of the reflection distance d to the background reflector. This makes the degree of danger represented by the normalized gas concentration more accurate.

[0146] [Fourth Embodiment]

[0147] use Figure 13A to Figure 15 A fourth embodiment will be described. Fig.13A It is a diagram for explaining a characteristic quantity indicating a time change in the concentration distribution of the analysis target gas 6 . Fig.13A The distribution of the analysis target gas 6 in a two-dimensional region is represented, and the concentration distribution is evaluated in four directions of X+ and X-axis, Y+ and Y-axis, V+ and V-axis, and U+ and U-axis, based on the point having the concentration peak.

[0148] Fig. 13B An example of a concentration distribution graph is shown. Fig. 13B The concentration distribution diagram is an example of the X+ and X- axes. It is a distribution diagram with the concentration peak value D0 as the 0 point, the concentration analysis values ​​in the X+ direction as D1, D2, ..., and the concentration analysis values ​​in the X- direction as D-1, D-2, ...

[0149] Fig. 13B The S** in the equation (** indicates the X+ and X- axes) is used to evaluate Fig.13A The value of the degree of diffusion (expansion) of the concentration distribution diagram can be obtained by equation (4). The diffusion state is evaluated for X+ and X- separately.

[0150]

[0151] Fig. 13B It records the coordinate value of the concentration peak, the peak concentration value, and the diffusion evaluation value S X- , S X+ , S Y- , S Y+ , S U- , S U+ , S V- , S V+ The table of the value at the current time t1 and the value at the previous time t0 calculates the time change evaluation value of the diffusion state of the gas concentration distribution in the right column.

[0152] Fig.14 The composite display image 553 shown in this embodiment is shown. Figure 6) is also superimposed with a graphic image that allows easy observation of the diffusion of the distribution. The synthetic display image 553 is a graphic image superimposed with G10, G11, G12, and G13, where G10 represents the change in the concentration peak coordinates (R, ), G11 and G12 represent the X- ~S V+ The selected value with the largest change among the time-varying evaluation values ​​is indicated by an arrow corresponding to the evaluation value. The time-varying gas diffusion condition is used to predict the dangerous area, and the evacuation direction is prompted by G13.

[0153] Fig.15 4 is a flowchart showing the processing flow of the gas visualization application unit 735 of the fourth embodiment. After the gas visualization application unit 735 is activated, initial settings are performed (S10), and then THz wave control processing S1 and analysis processing S2 are executed.

[0154] The gas visualization application unit 735 reads the recorded concentration data (S40) and detects a location where the concentration is a peak (S41). When there are a plurality of analysis target gases, the gas visualization application unit 735 performs processing for each of them.

[0155] Next, the gas visualization application unit 735 calculates evaluation parameters such as the diffusion state of the distribution ( S42 ) and records them ( S43 ).

[0156] The gas visualization application unit 735 reads evaluation parameters such as the diffusion state of the distribution at the previous moment (S44), and calculates the time variation of the parameters (S45). The gas visualization application unit 735 selects a meaningful part of the time variation of the evaluation parameters (S46).

[0157] The gas visualization application unit 735 detects the exit and obstacles of the evacuation route from the background image (S47), and determines the recommended evacuation direction (S48). S40 to S49 constitute the second extended analysis process S5 of the analysis process S2.

[0158] The gas visualization application unit 735 sends the meaningful evaluation parameters and evacuation direction to the display process S3 ( S49 ).

[0159] Gas Visualization Application Unit 735 Generated Fig.14 The synthesized display image 553 shown is displayed on the display 141 (S3). Furthermore, in S32, it is determined whether to continue or end.

[0160] As described above, according to the fourth embodiment, it is possible to calculate the evaluation value corresponding to the temporal change of the gas concentration distribution, predict the temporal change of the dangerous area, and present instructions such as an effective evacuation route in the synthesized image.

[0161] [Fifth Embodiment]

[0162] use Fig.16A , Fig. 16B and Fig.17 A fifth embodiment will be described. Fig.16A It is a front view of a THz wave detection device 100c according to the fifth embodiment. Fig. 16B It is a side cross-sectional view of a THz wave detection device 100 c according to the fifth embodiment.

[0163] Fig.16A In the embodiment, the THz wave detection device 100c is contained in the housing 410 in a manner of covering the controller 7, and the THz wave transceiver 1a is installed. The THz wave detection device 100c uses the front camera 143 to photograph the user himself and analyze the user's odor, etc. For example, the components of the fragrance contained in the laundry softener are detected to help remind the user not to cause trouble to the people around (due to the odor).

[0164] The THz wave detection device 100c includes a display 45a with a touch panel. A person is displayed on the display 45a with a touch panel, and a mark G14 is superimposed on the person. The shape of the mark G14 corresponds to the cause of the odor registered in advance, and its intensity is indicated by the number of horizontal bars G15 on the upper part of the screen.

[0165] Fig.17 1 is a flowchart showing the processing flow of the gas visualization application unit 735 according to the fifth embodiment. After the gas visualization application unit 735 is activated, initial settings are performed (S10), and then THz wave control processing S1 and analysis processing S2 are executed.

[0166] The gas visualization application unit 735 obtains the camera image from S29, identifies the human region in the image (S50), and generates a density image of the human region (S27). The gas visualization application unit 735 generates a graphic image using the density image (S28), and generates Fig.16A The flag G14 etc. shown (S29).

[0167] The gas visualization application unit 735 performs image synthesis processing to generate a synthesized display image 554 (S30), and displays the synthesized display image 554 on the display 45a with a touch panel (S31). Furthermore, in S32, it is determined whether to continue or end.

[0168] As described above, according to the fifth embodiment, the smell of the photographer himself can be easily analyzed using a camera unit for self-photography such as a smartphone.

[0169] The present invention is not limited to the Fig.17In the various embodiments described, a part of the structure of one embodiment can be replaced with another embodiment. In addition, the structure of another embodiment can be added to the structure of one embodiment. All of this belongs to the scope of the present invention. Furthermore, the numerical values ​​and messages appearing in the text and the figures are only examples, and the use of different numerical values ​​and messages does not impair the effect of the present invention.

[0170] In addition, for example, a part or all of the functions of the present invention can be realized by hardware through integrated circuit design. It can also be realized by software by interpreting and executing an action program by a microprocessor unit, CPU, etc. In addition, the scope of software implementation is not limited, and hardware and software can be used simultaneously.

[0171] In addition, in the above-mentioned embodiment, the object to be detected is the gas 6 to be analyzed, and the background reflector is the scenery in the actual space where the gas 6 to be analyzed floats, such as structures such as vehicles and rooms. However, the THz wave detection device 100 can also be used as an inspection device for products when they leave the factory. In this case, the product can be used as the background reflector, and the object to be detected is a foreign body in the product, such as detecting foreign bodies mixed into food. In addition, it can also be used to check whether there are foreign bodies mixed into non-food products such as tires. Further, it can also be used in pharmaceutical factory inspection devices, for coating inspection of multi-layer coated pharmaceuticals. In addition, it can also be used in baggage inspection areas at airports and other places to determine the contents of plastic bottles, or to inspect items in suitcases without opening the boxes.

[0172] Description of Reference Numerals

[0173] 1: THz wave transceiver

[0174] 2: Analysis Department

[0175] 3: Camera

[0176] 4: Visualization Department

[0177] 5: Background reflective objects

[0178] 6: Analytical gas

[0179] 7: Controller

[0180] 10: Smartphones

[0181] 11: Transmitter

[0182] 12: Receiver

[0183] 13: Launch control unit

[0184] 14: Antenna

[0185] 15a: Emitting Waves

[0186] 15b: Reflecting terahertz waves

[0187] 45a: Display with touch panel

Claims

1. A terahertz wave detection device, characterized in that: include: A terahertz wave transceiver including a transmitter for transmitting terahertz waves, and a receiver for receiving reflected terahertz waves reflected by a background reflector located behind an object to be analyzed; Display; and an information processing device connected to the terahertz wave transceiver and the display, respectively, The transmitter irradiates a terahertz wave to a two-dimensional region including the analysis object, wherein the terahertz wave is generated based on a transmission signal including a specific frequency. The information processing device comprises: an analysis unit that analyzes the concentration of the analysis object based on the reflected terahertz wave; and a visualization unit that generates a composite image by synthesizing a concentration image representing the concentration distribution of the analysis object on a background image of the background reflector based on the analysis result of the analysis unit, and displays the composite image on the display; wherein the visualization unit generates a concentration image representing the concentration distribution of the analysis object and also generates a graphic image representing the diffusion state of the concentration distribution of the analysis object, and displays the graphic image on the display by superimposing the graphic image with the composite image, The transmitter irradiates a terahertz wave generated by a transmission signal obtained by frequency sweeping. The analysis unit comprises: a frequency difference detection unit that detects a frequency difference between a frequency of the terahertz wave emitted by the transmitter and a frequency of the reflected terahertz wave received by the receiver; and a reflection distance calculation unit, which calculates the reflection distance from the terahertz wave transceiver to the background reflector based on the frequency difference, The visualization unit further includes a depth image generation unit that generates a depth image, wherein a display pattern in the depth image is changed according to the reflection distance. Among them, the concentration image is compared with the depth image to determine whether the analysis object displayed on the concentration image is located on the outside or inside compared to the subject of the background image, and based on the result of the determination, the composite image is generated in which the analysis object appears to be located on the outside or inside of the subject of the background image.

2. The terahertz wave detection device according to claim 1, characterized in that: The analysis unit also includes: a standardized concentration calculation unit that calculates a standardized concentration of the analysis object standardized by distance based on the intensity of the terahertz wave emitted by the emitter, the attenuation of the reflected terahertz wave with respect to the terahertz wave irradiated by the emitter, and the reflection distance; and an object identification unit that identifies the type of the analysis object based on the frequency at which attenuation occurs in the reflected terahertz wave, The visualization unit comprises: a density image generating unit for generating a density image, wherein a display pattern in the density image is changed in accordance with the standardized density; a graphic image generating unit that generates a graphic image indicating the type of the analysis object; and An image synthesis unit synthesizes the density image and the graphic image on the background image to generate a synthesized image, and displays the synthesized image on the display.

3. The terahertz wave detection device according to claim 2, characterized in that: The image synthesis unit generates the synthesized image by synthesizing the density image on the depth image using the depth image as the background image.

4. The terahertz wave detection device according to claim 2, characterized in that: The information processing device is connected to a camera that captures visible light to generate a camera image. The image synthesis unit generates the synthesized image by synthesizing the density image on the photographed image using the photographed image as the background image.

5. The terahertz wave detection device according to claim 2, characterized in that: The standardized concentration calculation unit assumes that the signal intensity of the flat portion where no absorption by the analyte occurs is R, the signal intensity at the frequency where attenuation occurs due to absorption of the terahertz wave by the analyte is S, and when the reflection distance is d, the standardized concentration is calculated by the following formula (1): Normalized concentration = R / S / d(1).

6. The terahertz wave detection device according to claim 1, characterized in that: The object of analysis is an invisible gas. The concentration image is an image that graphically represents the concentration distribution of the gas. The synthetic image is an image obtained by superimposing an image that graphically represents the concentration distribution of the gas on the background image.

7. The terahertz wave detection device according to claim 2, characterized in that: The terahertz wave detection device is installed on a telescopic device, and the telescopic device includes a support platform supporting the terahertz wave detection device and a telescopic rod connected to the support platform. The extension amount of the extension rod is changed, and the terahertz wave detection device is used to measure the analysis object multiple times, The standardized concentration calculation unit calculates the maximum angles θ1 and θ2 when the terahertz wave detection device measures the width direction end of the analysis object in each measurement, and assumes that the analysis distance difference caused by the difference in the expansion and contraction amount between the multiple measurements is l, and calculates the distance Lg from the terahertz wave detection device to the analysis object by the following formula (2): The signal intensity of the flat portion where no absorption by the analyte occurs is R, and the signal intensity at the frequency where attenuation occurs due to absorption of the terahertz wave by the analyte is S. The standardized concentration is calculated using the distance Lg by the following formula (3): Lg=ltanθ1 / (tanθ2-tanθ1) (2), Normalized concentration = R / S / Lg(3), The density image generating unit generates a new density image by updating the normalized density.

8. The terahertz wave detection device according to claim 1, characterized in that: The visualization unit comprises: a graphic image generating unit that obtains a density distribution on a plurality of axes for a plurality of density images generated in time series, obtains a center of the density distribution and an evaluation parameter corresponding to the spread of the density distribution, and generates graphic image data representing a time series change of the evaluation parameter; and An image synthesis unit synthesizes the graphic image data on the background image to generate a synthesized image, and displays the synthesized image on the display.

9. The terahertz wave detection device according to claim 8, characterized in that: The graphic image generating unit further generates a graphic image indicating a path in a direction different from the direction of the temporal change in the position of the density distribution based on the temporal change in the evaluation parameter, and generates the synthesized image by synthesizing the graphic image with the background image.

10. The terahertz wave detection device according to claim 4, characterized in that: The object of analysis is an odor component, The object recognition unit identifies an odor component based on the reflected terahertz wave, The graphic image generating unit generates a graphic image representing the type of the determined odor component. The image synthesis unit specifies a region in the captured image where the actual space in which the odor component is detected is captured, and generates a synthesized image by superimposing a graphic image indicating a type of the specified odor component on the region.

11. A terahertz wave detection method, characterized in that: include: a step of irradiating a two-dimensional region including the analysis object with a terahertz wave, wherein the terahertz wave is generated based on a transmission signal including a specific frequency; receiving a reflected terahertz wave reflected by a background reflector located behind the analysis object; A step of analyzing the concentration of the analysis object based on the reflected terahertz wave; A step of generating a composite image by combining a concentration image representing a concentration distribution of the analysis object on a background image of the background reflector based on an analysis result of the concentration of the analysis object; and The step of displaying the composite image on a display, wherein a concentration image representing the concentration distribution of the analysis object is generated and a graphic image representing the diffusion state of the concentration distribution of the analysis object is also generated, and the graphic image is superimposed on the synthetic image and displayed on the display, In the step of irradiating a terahertz wave, a terahertz wave generated based on a transmission signal obtained by frequency sweeping is irradiated. The step of analyzing the concentration of the analyte comprises: a step of detecting a frequency difference between the frequency of the emitted terahertz wave and the frequency of the received reflected terahertz wave; and Based on the frequency difference, a step of calculating the reflection distance to the background reflector, The step of generating the synthetic image includes the step of generating a depth image, wherein a display pattern in the depth image is changed according to the reflection distance, Among them, the concentration image is compared with the depth image to determine whether the analysis object displayed on the concentration image is located on the outside or inside compared to the subject of the background image, and based on the result of the determination, the composite image is generated in which the analysis object appears to be located on the outside or inside of the subject of the background image.

12. A terahertz wave detection system, characterized in that: include: A terahertz wave transceiver including a transmitter for transmitting terahertz waves, and a receiver for receiving reflected terahertz waves reflected by a background reflector located behind an object to be analyzed; A wearable terminal having a display; and an information processing device connected to the terahertz wave transceiver and the wearable terminal respectively, The terahertz wave transceiver irradiates a terahertz wave to a two-dimensional region including the analysis object, wherein the terahertz wave is generated based on a transmission signal including a specific frequency. The information processing device comprises: an analysis unit that analyzes the concentration of the analysis object based on the reflected terahertz wave; and a visualization unit that generates a composite image by synthesizing a concentration image representing the concentration distribution of the analysis object on the background image of the background reflector based on the analysis result of the analysis unit, and outputs the composite image to the wearable terminal, The visualization unit generates a concentration image representing the concentration distribution of the analysis object and also generates a graphic image representing the diffusion state of the concentration distribution of the analysis object, superimposes the graphic image with the synthetic image and outputs the graphic image to the wearable terminal. The transmitter irradiates a terahertz wave generated by a transmission signal obtained by frequency sweeping. The analysis unit comprises: a frequency difference detection unit that detects a frequency difference between a frequency of the terahertz wave emitted by the transmitter and a frequency of the reflected terahertz wave received by the receiver; and a reflection distance calculation unit, which calculates the reflection distance from the terahertz wave transceiver to the background reflector based on the frequency difference, The visualization unit further includes a depth image generation unit that generates a depth image, wherein a display pattern in the depth image is changed according to the reflection distance. Among them, the concentration image is compared with the depth image to determine whether the analysis object displayed on the concentration image is located on the outside or inside compared to the subject of the background image, and based on the result of the determination, the composite image is generated in which the analysis object appears to be located on the outside or inside of the subject of the background image.

Images