CN104038706B - A kind of Terahertz passive type colour focal plane camera - Google Patents
A kind of Terahertz passive type colour focal plane camera Download PDFInfo
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Abstract
The invention provides a kind of Terahertz passive type colour focal plane camera, including antenna feeder module, Terahertz focal plane multichannel coherent receiver module, IF signal processing module, local oscillator reference source.The receiver module is located on the focal plane of the reflector antenna of antenna feeder module, and the Terahertz radiofrequency signal that detected target sends focuses on the receiver module through the reflection of the reflector antenna；The receiver module includes Terahertz multi-beam quasi-optical frequency mixer, and the frequency mixer includes N1 × N2 pixel, and the Terahertz radiofrequency signal and Terahertz local oscillation signal that will be received are mixed, and produces N1 × N2 roads mixer output signal；IF signal processing module is processed N1 × N2 roads mixer output signal, exports N1 × N2 × W roads intermediate-freuqncy signal, and the value of W is consistent with the Terahertz frequency number of the detected target radiated wave of pretreatment.Photograph function of the invention improves the recognition capability of target, real time imagery, with preferable resolution ratio and sensitivity under complex background environment.
Description
Technical field
The present invention relates to THz imaging technology field, and in particular to a kind of Terahertz passive type colour focal plane photograph
Machine.
Background technology
Terahertz (Terahertz, THz) ripple is commonly referred to as frequency in 0.1THz~10THz (wavelength 3mm~30 μm) model
Enclose interior electromagnetic radiation (1THz=1012Hz), it in electromagnetic spectrum between microwave and infra-red radiation.Terahertz radiation
There can be following features in imaging applications：Terahertz radiation can penetrate many common nonmetallic coverage materials, detection
To concealment object；The wavelength of THz wave is short enough, can obtain imaging space resolution ratio higher, or realize danger in high precision
Positioning；The electromagenetic wave radiation of Terahertz frequency is non-ionized to organism, therefore is used under appropriate intensity, to human body ratio
It is safer；Compared to microwave and millimeter wave imaging system, under same image resolution ratio, terahertz imaging system bulk is smaller.Too
The These characteristics of Hertzion radiation determine that terahertz imaging has broad application prospects, and are one of international study hotspots.
But current terahertz imaging equipment be present：
1st, it is usually operated at a frequency.Using single Terahertz frequency, although can effectively find target and to target
Picture is implemented as, but due to the complexity of infrared radiation characteristics, is existed on effective target radiant intensity or feature recognition and is asked
Topic.
2nd, generally uses single pixel Scan Architecture, it is impossible to which real time imagery, resolution ratio has much room for improvement.
3rd, generally use direct detection mode, or less pixel heterodyne reception mode.If using direct detection side
Formula, although can easier realize the focal plane imaging of large scale array, but sensitivity is relatively low and has lacked phase information；
If using heterodyne reception mode, each passage is required to local oscillation signal, therefore intermediate-frequency circuit is complicated and volume is larger, is not suitable for
It is portable to use.
The content of the invention
The technical problems to be solved by the invention are the disadvantages mentioned above for overcoming prior art, there is provided a kind of Terahertz passive type
Colored focal plane camera, can improve the recognition capability of target, real time imagery, with preferably resolution under complex background environment
Rate and sensitivity higher, with small volume, simple intermediate-frequency circuit, it is adaptable to the extensive Cheng Zhen of two dimension, overall receiver
Volume and weight is small.
A kind of Terahertz passive type colour focal plane camera that the present invention is provided includes that antenna feeder module, Terahertz are burnt flat
Face multichannel coherent receiver module, IF signal processing module, local oscillator reference source；Antenna feeder module includes reflector antenna and antenna
Servo module, the reflector antenna in antenna feeder module is used to receive the Terahertz radiofrequency signal that detected target sends, reflecting surface
Antenna scans the Terahertz radiofrequency signal of measured target under the control of antenna servo module；Terahertz focal plane multichannel coherent
Receiver module is located on the focal plane of reflector antenna, and the Terahertz radiofrequency signal that detected target sends is through in antenna feeder module
The reflection of reflector antenna, focuses on Terahertz focal plane multichannel coherent receiver module；Terahertz focal plane multichannel coherent
Receiver module includes Terahertz multi-beam quasi-optical frequency mixer, and Terahertz multi-beam quasi-optical frequency mixer includes N1 × N2 pixel, too
The Terahertz radiofrequency signal and Terahertz local oscillation signal that hertz multi-beam quasi-optical frequency mixer will be received are mixed, and produce N1 × N2
Road mixer output signal, N1, N2 be >=1 natural number, it is defeated per being mixed all the way per one pixel of correspondence of mixer output signal all the way
Go out signal and be referred to as each pixel mixer output signal；IF signal processing module includes double conversion module, double conversion module
Including N1 × N2 intermediate-freuqncy signal device, each intermediate-freuqncy signal device to carrying out one point of W road successively per mixer output signal all the way
Power distribution, filtering, low noise amplification, secondary mixing treatment, export N1 × N2 × W roads intermediate-freuqncy signal, value and the pretreatment of W
The Terahertz frequency number of the THz wave that detected target gives off is consistent, and W is >=1 natural number.
Terahertz passive type colour focal plane camera of the invention has the advantages that relative to prior art：
1st, comparing needs the single pixel camera of scanning, focal plane camera to have the following advantages：1) can be real-time
Imaging, can be imaged to fast-moving target；2) with preferable resolution ratio and higher sensitivity, because staring battle array using focal plane
Row, antenna need not scan, opticator just can be made it is larger, such that it is able to obtain preferable resolution ratio；Because integration
Time is not limited by sweep speed, therefore is possible to obtain higher sensitivity.
2nd, focal plane camera of the invention can be operated in multiple frequencies, due to receiving a multiple frequency spokes for target
Penetrate signal, it is possible to achieve under complex background environment (such as in the case where target and background radiation intensity contrast are very low or
Person is under the radiation such as sunlight/reflection interference) improve target recognition capability.
3rd, Terahertz multi-beam quasi-optical frequency mixer and IF signal processing module are integrated using LTCC packaging technologies, realize
Integrated three-dimensional three-dimensional encapsulation, multi channel imaging system in Terahertz focal plane of the invention uses the quasi-optical mixing of Terahertz multi-beam
Device is used as main reception and frequency converting element, and integrated level is high, is very suitable for two-dimentional extensive Cheng Zhen；Suitable for two-dimentional extensive
Cheng Zhen, overall receiver volume and weight is small, is convenient for carrying；The present invention can avoid being mixed antenna using high resistance medium lens
The generation of surface wave, improves the gain of antenna, reduces surface wave loss, it is possible to improve the directionality of antenna, high resistance medium is saturating
Mirror uses fly's-eye lens, therefore in specific imaging applications, array structure is more flexible, go for big visual field or
The occasions such as remote focused images.
4th, the present invention can effectively improve the isolation of radiofrequency signal and local oscillation signal using beam splitter.
5th, occupation mode flexibly, when needing to carry out big view field imaging, can scan secondary mirror, realize that wide visual field is imaged.
6th, can be with domestic autonomous production, and as the quantity of product is lifted, cost is greatly lowered.
Brief description of the drawings
It should be noted that drawings in the following description shown schematically only show some embodiments, not including it is all can
The embodiment of energy.
Fig. 1 is the schematic diagram of the embodiment of Terahertz passive type colour focal plane camera；
Fig. 2 is the schematic diagram and Terahertz passive type colour focal plane camera embodiments of antenna feeder modular structure embodiment
Part signal schematic flow sheet；
Fig. 3 is the schematic diagram of the embodiment of Terahertz multi-beam quasi-optical frequency mixer；
Fig. 4 is the network topology structure schematic diagram of the embodiment of IF signal processing module.
Specific embodiment
Below in conjunction with the technical scheme of Description of Drawings exemplary embodiment of the invention.Obviously, described embodiment
Simply a part of embodiment of the invention, rather than whole embodiments.Described embodiment is only used for illustrating, without
Limit the scope of the present invention.Based on embodiments of the invention, those of ordinary skill in the art are not making creative labor
The every other embodiment obtained under the premise of dynamic, belongs to the scope of protection of the invention.
Although word first, second used herein etc. describes multiple element or constitutes part, these elements or
Constituting part should not be limited by these words.These words be only used for distinguish an element or constitute part and another element or
Part is constituted, and does not include " order ".Therefore, the first element discussed below or composition part are referred to as the second element or composition
Part is also without departing from the spirit and scope of the present invention.
Fig. 1 shows a kind of schematic diagram of the embodiment of Terahertz passive type colour focal plane camera.As shown in figure 1,
A kind of Terahertz passive type color camera includes antenna feeder module, Terahertz focal plane multichannel coherent receiver module, intermediate frequency letter
Number processing module, local oscillator reference source, analog/digital conversion and storage processing module, digital signal processing module, display and control module
And power module.
Antenna feeder module includes reflector antenna and antenna servo module, and reflector antenna sends for receiving detected target
Terahertz radiofrequency signal, reflector antenna scanned under the control of antenna servo module measured target Terahertz radio frequency letter
Number.Reflector antenna in antenna feeder module can include main parabolic using defocusing Cassegrain antenna, defocusing Cassegrain antenna
Face and secondary reflection face, for receiving the THz wave that detected target sends.Terahertz focal plane multichannel coherent receives mould
Block is located on the focal plane of reflector antenna, and the Terahertz radiofrequency signal that detected target sends is through main parabola and secondary reflection
The reflection in face, focuses on Terahertz focal plane multichannel coherent receiver module；Antenna servo module control secondary reflection face, is needing
When increasing visual field, the imaging realized to big visual field detected target can be scanned by secondary reflection face, as shown in Figure 2.
Wherein, the paraboloidal bore D of master meets：
Wherein, θ3dBIt is the spatial resolution of Terahertz focal plane multi channel imaging system, λ0For detected target gives off
THz wave wavelength.What rad (radian) was represented is the size at the size angle at angle.
Terahertz focal plane multichannel coherent receiver module include beam splitter, Terahertz multi-beam quasi-optical frequency mixer and
Terahertz local oscillator frequency multiplier.Terahertz local oscillator frequency multiplier is used to produce Terahertz local oscillation signal, the local oscillator that local oscillator reference source is produced
Signal is by after Terahertz local oscillator frequency multiplier frequency multiplication, producing Terahertz local oscillation signal；Beam splitter is used to control Terahertz sheet
Shake the spatial direction of signal, transmits Terahertz radiofrequency signal and reflected terahertz hereby local oscillation signal, believes Terahertz radio frequency
Number and Terahertz local oscillation signal be collectively delivered to Terahertz multi-beam quasi-optical frequency mixer.Terahertz multi-beam prepares frequency mixer to be included
N1 × N2 pixel；The Terahertz radiofrequency signal and Terahertz local oscillation signal that Terahertz multi-beam quasi-optical frequency mixer will be received are carried out
Mixing, produces N1 × N2 roads mixer output signal；N1, N2 be >=1 natural number, per one picture of correspondence of mixer output signal all the way
Element, each pixel mixer output signal is referred to as per mixer output signal all the way.
Terahertz multi-beam quasi-optical frequency mixer includes high resistance medium lens and mixing antenna chip, as shown in Fig. 3 shapes.Mixing
Antenna chip includes mutually isostructural N1 × N2 mixing antenna, is arranged in N1 rows, N2 row.High resistance medium lens are saturating using compound eye
Mirror, fly's-eye lens includes lenslet array and spread footing, and lenslet array is located on spread footing, and lenslet is by extending bottom
Seat and mixing antenna realize the transmission between signal；Lenslet array includes N1 × N2 lenslet, lenslet and mixing antenna one
One correspondence, the mixing antenna that the center of lenslet is corresponding is centrally located on same axis, and a pixel includes that one is mixed
Frequency antenna and a lenslet.
Using quasi-optical mixing structure, i.e. the high resistance medium lens of Terahertz multi-beam quasi-optical frequency mixer, including compound eye structural
With mixing antenna chip.The high resistance medium lens of wherein compound eye structural are a broadband response devices, therefore, many ripples of Terahertz
The response frequency of beam quasi-optical frequency mixer depends primarily on the response frequency of mixing antenna chip.In order to realize target emanation out
The reception of multiple frequency signals, the on-chip antenna form that each pixel is used in mixing antenna chip uses wide band antenna
Form, such as helical antenna, log-periodic antenna etc.；Or using the antenna structure that can be responded in several frequencies.
Fig. 4 shows the network topology structure schematic diagram of the embodiment of IF signal processing module.IF signal processing mould
Block includes double conversion module, and double conversion module includes N1 × N2 signal process unit of intermediate frequency, each intermediate-freuqncy signal device
To carrying out one point of W roads power distribution, filtering, low noise amplification, secondary mixing treatment, output successively per mixer output signal all the way
The Terahertz frequency number of the THz wave that the value of N1 × N2 × W roads intermediate-freuqncy signal, W gives off with the detected target of pretreatment
Unanimously, W is >=1 integer (natural number).
Each signal process unit of intermediate frequency of IF signal processing module is processed every mixer output signal all the way, in
Frequency recoil simulator includes one point of W roads power divider, wave filter, low-noise amplifier, secondary mixing device and frequency multiplier, per all the way
Mixer output signal all can be by one point of W roads power divider, then respectively through wave filter, low-noise amplifier, secondary mixed
Frequency device, intermediate-freuqncy signal is exported from secondary mixing device, and N1 × N2 × W roads intermediate-freuqncy signal is exported altogether, wherein, one point of W road work(
Rate distributor is divided into W roads by what Terahertz multi-beam quasi-optical frequency mixer was exported per mixer output signal all the way,
The local oscillation signal that local oscillator reference source is produced is secondary mixed by after the frequency multiplier frequency multiplication of IF signal processing module, producing
The local oscillation signal of frequency.
For example, W=3, then take three frequencies that target emanation goes out in terahertz signal；Three frequencies can for example take
220.5GHz, 340.2GHz, 450.1GHz, such as Terahertz local oscillation signal frequency are 100GHz；Then for 220.5GHz, utilize
2 mixing, export 20.5GHz signals；For 340.2GHz, using 3 mixing, 40.2GHz signals are exported；For
450.1GHz, using 4 mixing, exports 50.1GHz signals.As W=3, one point of W road power divider is one point of 3 tunnel
Power divider.
Each pixel mixing output letter that one point of No. 3 power divider exports Terahertz multi-beam quasi-optical frequency mixer
Number it is divided into 3 road signals, 3 road signal includes first via signal, second road signal, the 3rd road signal, and wave filter includes first
Wave filter, the second wave filter, the 3rd wave filter, first via signal is by the first wave filter, the first wave filter output 20.5GHz letters
Number, second road signal is filtered by the second wave filter, the second wave filter output 40.2GHz signals, the 3rd road signal by the 3rd
Device, the 3rd wave filter output 50.1GHz signals, for 20.5GHz signals, 40.2GHz signals, 50.1GHz signals, then passes through respectively
Crossing secondary mixing device (for example local oscillator reference source is 10GHz, respectively through 2 times, 4 times and 5 times frequencys multiplication) carries out secondary mixing, exports
The intermediate-freuqncy signal of 500MHz, 200MHz, 100MHz, as shown in Figure 4.
Analog/digital conversion with storage processing module the intermediate-freuqncy signal that IF signal processing module is exported is sampled, is quantified,
Coding, is transformed into intermediate-freuqncy signal digital intermediate frequency signal and is stored, while digital intermediate frequency signal is exported to data signal
Processing module.
Digital signal processing module according to acquired original data, according to the middle frequency that calibration equation exports each passage
Word signal is converted into radiation temperature value, and is ultimately converted to image gradation data, and by image gradation data send to display with
Control module.
Display is used for display gray shade value image with control module, and controls antenna servo module, realizes the machine of spatial beams
Tool is scanned.
Power module is used for antenna servo module, Terahertz local oscillator frequency multiplier, local oscillator reference source, IF signal processing mould
Block, analog/digital conversion and storage processing module, and display provide electric current or voltage with control module.
Terahertz multi-beam quasi-optical frequency mixer and IF signal processing module are integrated using LTCC packaging technologies, realize one
Body 3 D stereo is encapsulated.Although with continuing to develop for integrated chip technology, many radio frequency active circuits can be realized small
Type single-chip integration, but passive device can not even be realized in IC interior it is integrated, as occupy circuit two dimension domain
The main devices of area.This equipment makes full use of LTCC techniques, and feature, IF signal processing module are encapsulated with 3 D stereoization
Double conversion module be embedded in the lower surface cavity of the encapsulation based on LTCC or Surface Mount is on LTCC lower surface substrates, too
The mixing antenna chip of hertz multi-beam quasi-optical frequency mixer is located at ltcc substrate top.Design is encapsulated using 3 D stereo,
The two-dimension plane structure of traditional circuit to the transformation of 3 D stereo encapsulating structure is realized, the volume of equipment is greatly reduced
And weight.In addition, as a result of integrated process, it is to avoid cumbersome group necessary to original discrete system
Dress and debugging process, so as to improve the global reliability of system.
Using quasi-optical mixing structure, i.e. the high resistance medium lens of Terahertz multi-beam quasi-optical frequency mixer, including compound eye structural
With mixing antenna chip.The high resistance medium lens of wherein compound eye structural are a broadband response devices, therefore, many ripples of Terahertz
The response frequency of beam quasi-optical frequency mixer depends primarily on the response frequency of mixing antenna chip.In order to realize target emanation out
The reception of multiple frequency signals, the on-chip antenna form that each pixel is used in mixing antenna chip uses wide band antenna
Form, such as helical antenna, log-periodic antenna etc.；Or using the antenna structure that can be responded in several frequencies.
Description to embodiments of the invention above is merely to illustrate technical scheme, rather than to model of the present invention
The limitation enclosed, the present invention is not limited to these disclosed embodiments, and those skilled in the art can be to foregoing embodiments
Described technical scheme is modified, or equivalent is carried out to which part technical characteristic, and these modifications or replacement
Protection scope of the present invention should all be fallen into.
Claims (10)
1. a kind of Terahertz passive type colour focal plane camera, it is characterised in that the camera includes antenna feeder module, terahertz
Hereby focal plane multichannel coherent receiver module, IF signal processing module,
Antenna feeder module includes reflector antenna and antenna servo module, and the reflector antenna in antenna feeder module is used to receive detected
The Terahertz radiofrequency signal that target sends, reflector antenna scans the Terahertz of measured target under the control of antenna servo module
Radiofrequency signal；
Terahertz focal plane multichannel coherent receiver module is located on the focal plane of reflector antenna, and detected target sends too
Hertz radiofrequency signal focuses on Terahertz focal plane multichannel coherent and receives mould through the reflection of the reflector antenna in antenna feeder module
Block；Terahertz focal plane multichannel coherent receiver module includes Terahertz multi-beam quasi-optical frequency mixer, and Terahertz multi-beam is quasi-optical
Frequency mixer includes N1 × N2 pixel, Terahertz radiofrequency signal and Terahertz sheet that Terahertz multi-beam quasi-optical frequency mixer will be received
The signal that shakes is mixed, and produces N1 × N2 roads mixer output signal, and N1, N2 be >=1 natural number, per mixer output signal all the way
One pixel of correspondence, each pixel mixer output signal is referred to as per mixer output signal all the way；
IF signal processing module includes double conversion module, and double conversion module includes N1 × N2 intermediate-freuqncy signal device, often
One intermediate-freuqncy signal device to carrying out one point of W roads power distribution, filtering, low noise amplification, two successively per mixer output signal all the way
Secondary Frequency mixing processing, exports N1 × N2 × W roads intermediate-freuqncy signal, the THz wave that the value of W gives off with the detected target for pre-processing
Terahertz frequency number it is consistent, W is >=1 natural number.
2. Terahertz passive type color camera as claimed in claim 1, it is characterised in that：Reflecting surface day in antenna feeder module
Line includes main parabola and secondary reflection face using defocusing Cassegrain antenna, defocusing Cassegrain antenna；Detected target is sent out
The Terahertz radiofrequency signal for going out focuses on Terahertz focal plane through the reflection of main parabola and secondary reflection face in antenna feeder module
Multichannel coherent receiver module；
Antenna servo module control secondary reflection face, by the scanning in secondary reflection face realize to big visual field detected target into
Picture.
3. Terahertz passive type color camera as claimed in claim 2, it is characterised in that：The paraboloidal bore D of master meets：
Wherein, θ3dBIt is the spatial resolution of Terahertz focal plane multi channel imaging system, λ0For detected target gives off too
The wavelength of Hertz wave.
4. Terahertz passive type color camera as claimed in claim 1, it is characterised in that：
The camera also includes local oscillator reference source；
Terahertz focal plane multichannel coherent receiver module also includes beam splitter, Terahertz local oscillator frequency multiplier, local oscillator reference
The local oscillation signal that source produces is by producing Terahertz local oscillation signal after Terahertz local oscillator frequency multiplier frequency multiplication；Beam splitter is used to control
The spatial direction of Terahertz local oscillation signal processed, transmits Terahertz radiofrequency signal and reflected terahertz hereby local oscillation signal, makes too
Hertz radiofrequency signal and Terahertz local oscillation signal are collectively delivered to Terahertz multi-beam quasi-optical frequency mixer.
5. Terahertz passive type color camera as claimed in claim 4, it is characterised in that：The quasi-optical mixing of Terahertz multi-beam
Device includes high resistance medium lens and mixing antenna chip；Mixing antenna chip includes mutually isostructural N1 × N2 mixing antenna,
It is arranged in N1 rows, N2 row；High resistance medium lens use fly's-eye lens, and fly's-eye lens includes lenslet array and spread footing, small
Lens array is located on spread footing, and lenslet realizes the transmission between signal by spread footing and mixing antenna；Lenslet array
Row include N1 × N2 lenslet, lenslet be mixed antenna one-to-one corresponding, the corresponding mixing antenna in the center of lenslet
It is centrally located on same axis, a pixel includes a mixing antenna and a lenslet.
6. Terahertz passive type color camera as claimed in claim 1, it is characterised in that：
To being processed per mixer output signal all the way, intermediate-freuqncy signal is filled each intermediate-freuqncy signal device of IF signal processing module
Put including one point of W roads power divider, wave filter, low-noise amplifier, secondary mixing device and frequency multiplier, per mixing output all the way
Signal all can be by one point of W roads power divider, then respectively through wave filter, low-noise amplifier, secondary mixing device, from two
Secondary frequency mixer exports intermediate-freuqncy signal, and N1 × N2 × W roads intermediate-freuqncy signal is exported altogether, wherein, one point of W road power divider will
Every mixer output signal all the way of Terahertz multi-beam quasi-optical frequency mixer output is divided into W roads,
It is further characterized in that：The camera includes local oscillator reference source, and the local oscillation signal that local oscillator reference source is produced is believed by intermediate frequency
After the frequency multiplier frequency multiplication of number processing module, the local oscillation signal of secondary mixing is produced.
7. Terahertz passive type color camera as claimed in claim 1, it is characterised in that：
The camera also include analog/digital conversion with storage processing module, digital signal processing module, display with control module and
Power module,
Analog/digital conversion is sampled to the intermediate-freuqncy signal that IF signal processing module is exported with storage processing module, quantified, compiled
Code, is transformed into intermediate-freuqncy signal digital intermediate frequency signal and is stored, while digital intermediate frequency signal is exported at data signal
Reason module；
Digital signal processing module according to acquired original data, according to the digital intermediate frequency signal that calibration equation exports each passage
Radiation temperature value is converted into, and is ultimately converted to image gradation data, and send image gradation data to display with control mould
Block；
Display is used for display gray shade value image with control module, and controls antenna servo module, realizes that the machinery of spatial beams is swept
Retouch；
Power module be used for antenna servo module, Terahertz local oscillator frequency multiplier, local oscillator reference source, IF signal processing module,
Analog/digital conversion and storage processing module, and display provide electric current or voltage with control module.
8. the Terahertz passive type color camera as described in any claim of claim 1-7, it is characterised in that：Terahertz
Hereby multi-beam quasi-optical frequency mixer and IF signal processing module are integrated using LTCC packaging technologies, realize integrated three-dimensional three-dimensional
Encapsulation, the double conversion module of wherein IF signal processing module be embedded in the lower surface cavity of the encapsulation based on LTCC or
On LTCC lower surface substrates, the mixing antenna chip of Terahertz multi-beam quasi-optical frequency mixer is located at ltcc substrate top to Surface Mount.
9. Terahertz passive type color camera as claimed in claim 6, it is characterised in that：W=3, takes target emanation and goes out too
Three frequencies in hertz signal, one point of W road power divider is one point of No. 3 power divider.
10. Terahertz passive type color camera as claimed in claim 9, it is characterised in that：Three frequencies are taken as
220.5GHz, 340.2GHz, 450.1GHz, Terahertz local oscillation signal frequency are 100GHz；It is mixed using 2 times for 220.5GHz
Frequently, 20.5GHz signals are exported；For 340.2GHz, using 3 mixing, 40.2GHz signals are exported；For 450.1GHz, utilize
4 mixing, export 50.1GHz signals；
Each pixel mixer output signal that one point of No. 3 power divider exports Terahertz multi-beam quasi-optical frequency mixer point
It is 3 road signals, 3 road signal includes first via signal, second road signal, the 3rd road signal, and wave filter includes the first filtering
Device, the second wave filter, the 3rd wave filter, first via signal export 20.5GHz signals by the first wave filter, the first wave filter,
Second road signal passes through the 3rd wave filter by the second wave filter, the second wave filter output 40.2GHz signals, the 3rd road signal,
3rd wave filter exports 50.1GHz signals, for 20.5GHz signals, 40.2GHz signals, 50.1GHz signals, then respectively through
Secondary mixing device carries out secondary mixing, exports the intermediate-freuqncy signal of 500MHz, 200MHz, 100MHz.
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| US10571393B2 (en) | 2018-04-13 | 2020-02-25 | Tsinghua University | Terahertz gas detection method and device based on Gregory double reflection antenna |
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| CN108398691B (en) * | 2018-05-25 | 2023-10-17 | 中国工程物理研究院流体物理研究所 | Difference frequency signal generating device and method |
| CN109031449A (en) * | 2018-10-29 | 2018-12-18 | 苏州耶拿微电子有限公司 | Using the passive superconduction Terahertz human body safety check instrument of WR10 waveguide |
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| CN114216853B (en) * | 2021-12-13 | 2023-12-29 | 清华大学 | Real-time detection system and method based on terahertz leaky-wave antenna |
| CN115712126B (en) * | 2023-01-09 | 2023-05-05 | 北京理工大学 | Terahertz frequency modulation continuous wave quasi-optical array three-dimensional imaging system and method |
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| CN1880950A (en) * | 2005-06-06 | 2006-12-20 | 前视红外系统股份公司 | Infrared camera |
| JP2007503622A (en) * | 2003-08-26 | 2007-02-22 | レッドシフト システムズ コーポレイション | Infrared camera system |
| CN201616858U (en) * | 2010-03-30 | 2010-10-27 | 天津三星光电子有限公司 | Video camera with functions of temperature recognizing, automatic photographing and video recording |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US8531562B2 (en) * | 2004-12-03 | 2013-09-10 | Fluke Corporation | Visible light and IR combined image camera with a laser pointer |
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| US6559447B2 (en) * | 2000-12-26 | 2003-05-06 | Honeywell International Inc. | Lightweight infrared camera |
| JP2007503622A (en) * | 2003-08-26 | 2007-02-22 | レッドシフト システムズ コーポレイション | Infrared camera system |
| CN1880950A (en) * | 2005-06-06 | 2006-12-20 | 前视红外系统股份公司 | Infrared camera |
| CN201616858U (en) * | 2010-03-30 | 2010-10-27 | 天津三星光电子有限公司 | Video camera with functions of temperature recognizing, automatic photographing and video recording |
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| CN104038706A (en) | 2014-09-10 |
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