CN209513617U - The device of THz wave imaging signal to noise ratio is improved based on reflection windows - Google Patents
The device of THz wave imaging signal to noise ratio is improved based on reflection windows Download PDFInfo
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- CN209513617U CN209513617U CN201821829068.0U CN201821829068U CN209513617U CN 209513617 U CN209513617 U CN 209513617U CN 201821829068 U CN201821829068 U CN 201821829068U CN 209513617 U CN209513617 U CN 209513617U
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- thz wave
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- noise ratio
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- paraboloidal mirror
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Abstract
The utility model discloses a kind of devices that THz wave imaging signal to noise ratio is improved based on reflection windows, the reflection windows for the disadvantages of the utility model is only with for reducing the uneven diffusing scattering of Fresnel reflection, object, it realizes and increases signal amplitude to the greatest extent in sample phase, improve imaging signal to noise ratio.Interference theory is applied in reflective imaging by the utility model, realizes the promotion of imaging signal intensity, improves imaging signal to noise ratio, simple and convenient and good imaging quality.
Description
Technical field
The utility model relates to THz wave imaging field, more particularly to it is a kind of based on reflection windows improve THz wave at
As the device of signal-to-noise ratio.
Background technique
Terahertz (Terahertz, abbreviation THz, 1THz=1012Hz) radiation refer to frequency from 0.1THz to 10THz, accordingly
Wavelength from 3 millimeters to 30 micron, the comparatively wide electromagnetic spectrum region of spectral range between millimeter wave and infrared light.Terahertz
It hereby radiates in electromagnetic spectrum locating specific position and imparts a series of its special property, this makes Terahertz Technology can be with
It is applied to the fields such as biomedical detection, substance characteristics research, safety check.THz wave in the related technology, THz wave imaging
It is even more to achieve a series of achievements as one of its research hotspot.Currently, THz wave imaging technique is in field of biomedicine
Realize a variety of lesion identifications, such as cutaneum carcinoma, liver cancer, breast cancer, glioma.Wherein, field of biomedicine it is most common at
Image space formula is reflective imaging.
However, the disadvantages of reflective imaging technique uneven there are Fresnel reflection, object diffusing scattering, this will lead to reflection
Imaging signal strength reduction, and then imaging signal to noise ratio is reduced, seriously affect image quality.In addition, Terahertz heat-sensitive eye
Be affected by the external environment serious, in the lower situation of signal-to-noise ratio, will lead to a possibility that imaging results generate error increase severely or
Directly generate large error.Especially needed in Terahertz biomedicine light spectrum image-forming field since sample surfaces are more coarse
In sample surfaces plus reflection windows to reduce irreflexive influence.
Currently, the terahertz emission source for being commonly used in Terahertz biomedicine light spectrum image-forming includes: terahertz time-domain light
Spectrometer (THz-TDS), backward wave oscillator (BWO), honest and just formula oscillator, the far infrared based on CO2 laser pumping gas material
Laser, the difference frequency source based on nonlinear optical effect or parameter concussion source etc..Terahertz time-domain spectroscopy instrument isopulse source can be with
The amplitude and phase information of object are measured simultaneously, but since Energy distribution is in the whole bandwidth of terahertz pulse, in narrowband frequency
Signal-to-noise ratio (SNR) in rate is usually very low, and the ratio between noise level of peak signal amplitude and time domain data may be very big, serious shadow
Ring image quality.
Currently, certain effect is also achieved by the method that innovatory algorithm recovers original signal, however its calculate it is cumbersome and
Only restore to export with certain probability.Far infrared based on backward wave oscillator (BWO), honest and just formula oscillator, CO2 laser pumping
Laser, difference frequency source or parameter concussion source are only capable of obtaining the strength information of object, by the power for improving terahertz emission source
The influence of noise of external environment is reduced to a certain extent, but for absorbing biggish sample, signal-to-noise ratio is difficult to improve.
Therefore one kind is badly in need of in the reflective imaging of Terahertz can improve the signal-to-noise ratio of sample in sample phase to reach high-quality
The method for measuring Imaged samples.
Utility model content
The utility model provides a kind of device that THz wave imaging signal to noise ratio is improved based on reflection windows, this is practical new
Type is mentioned increases signal amplitude in sample phase to the greatest extent, improves imaging signal to noise ratio, described below:
The device of THz wave imaging signal to noise ratio is improved based on reflection windows, described device includes:
THz wave plane mirror, the first THz wave off axis paraboloidal mirror, the second THz wave off axis paraboloidal mirror,
Third THz wave off axis paraboloidal mirror is successively set on the emitting light path of THz wave；
First THz wave off axis paraboloidal mirror is used to the THz wave focusing of output being incident on reflection windows；Second
THz wave off axis paraboloidal mirror is arranged on the signal light emitting light path for putting sampling device, for receiving signal light Terahertz
Wave；The setting of third THz wave off axis paraboloidal mirror is before THz wave detection, for receiving simultaneously focus signal light THz wave
Into detector；
Detector is arranged on the signal light emitting light path of third THz wave off axis paraboloidal mirror, collects third Terahertz
The reflected light of wave off axis paraboloidal mirror；
Reflection windows be the material saturating to Terahertz wave height, be fixed in two-dimensional scanning platform, for place it is to be measured at
Decent product.
Further, the terahertz emission source is continuous or pulse terahertz emission source.
Wherein, the THz wave plane mirror, the first THz wave off axis paraboloidal mirror, the second THz wave are off-axis
Paraboloidal mirror, third THz wave off axis paraboloidal mirror plate the broadband high-reflecting film of terahertz wave band.
When specific implementation, the THz source generates THz wave output, is incident on reflection windows with 30 ° of angles.
The beneficial effects of the utility model are:
1, it is imaged compared to areflexia window, the use of reflection windows can reduce the diffusing reflection phenomenon in reflective imaging, pole
The earth alleviates influence of the diffusing reflection to imaging signal strength reduction.
2, the utility model only passes through the thickness of selection reflection windows, realizes the promotion of imaging signal strength, improves imaging
Signal-to-noise ratio, device simple and convenient and good imaging quality.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that the device of THz wave imaging signal to noise ratio is improved based on reflection windows；
Fig. 2 is the index path of the reflective imaging of THz wave；
Fig. 3 is signal-to-noise ratio figure.
In attached drawing 1, what each component indicated is listed as follows:
1: terahertz emission source；2: detector；
3: the first THz wave off axis paraboloidal mirrors；4: the second THz wave off axis paraboloidal mirrors；
5: third THz wave off axis paraboloidal mirror；6: THz wave plane mirror；
7: reflection windows.
In attached drawing 2, what each component indicated is listed as follows:
21: for first face of reflection windows；
22: for reflection windows and sample contacting face, referred to as second face of reflection windows；
23: for sample to be tested (or gold-plated reflecting mirror)；
24: for reflection windows.
Specific embodiment
To keep the purpose of this utility model, technical solution and advantage clearer, below to the utility model embodiment
It is described in further detail.
Embodiment 1
The utility model embodiment provides a kind of device that THz wave imaging signal to noise ratio is improved based on reflection windows, ginseng
See Fig. 1 and Fig. 2, the device include: terahertz emission source 1, receive the detector 2 in terahertz emission source, the first THz wave from
Axis paraboloidal mirror 3, the second THz wave off axis paraboloidal mirror 4, third THz wave off axis paraboloidal mirror 5, THz wave plane
Reflecting mirror 6 and reflection windows 7,
Wherein, reflection windows 7 are the material saturating to Terahertz wave height, are fixed in two-dimensional scanning platform, for placing
Imaged samples to be measured；
THz wave plane mirror 6, the first THz wave off axis paraboloidal mirror 3, the second THz wave off axis paraboloid mirror
Mirror 4, third THz wave off axis paraboloidal mirror 5 are successively set on the emitting light path of THz wave；
First THz wave off axis paraboloidal mirror 3 is used to the THz wave focusing of output being incident on reflection windows 7；The
Two THz wave off axis paraboloidal mirrors 4 are arranged on the signal light emitting light path for putting sampling device, for receiving signal light terahertz
Hereby wave；The setting of third THz wave off axis paraboloidal mirror 5 is before THz wave detection, for receiving simultaneously focus signal light Terahertz
Wave enters detector 2；
Detector 2 is arranged on the signal light emitting light path of third THz wave off axis paraboloidal mirror 5, collects third terahertz
The hereby reflected light of wave off axis paraboloidal mirror 5；
Wherein, terahertz emission source is continuous or pulse terahertz emission source.
THz wave plane mirror 6, the first THz wave off axis paraboloidal mirror 3, the second THz wave off axis paraboloid mirror
Mirror 4, third THz wave off axis paraboloidal mirror 5 plate the broadband high-reflecting film of terahertz wave band.
Wherein, THz source generates THz wave output, is incident on reflection windows with 30 ° of angles.
Further, the two-dimensional stage for placing sample is to move along x-axis and y-axis at s type.
Further, reflection windows 7 are to the high saturating material of Terahertz, and THz source is that corresponding terahertz detector 2 connects
The wave band of receipts.
Wherein, reflective imaging can scan unlimited large sample.Detector 2 is the detector of terahertz wave band.
In conclusion the utility model embodiment, which mentions, to improve catoptric imaging signal-to-noise ratio in sample phase, and then reduce
Influence of the external environment to imaging, effectively improves image quality.
Embodiment 2
Feasibility verifying is carried out to scheme, the working principle in embodiment 1 below with reference to Fig. 3, described below:
This example is scanned imaging to gold-plated reflecting mirror by the reflection windows using different-thickness, calculates catoptric imaging letter
It makes an uproar ratio.When Terahertz frequency is 2.52THz, to the signal-to-noise ratio of horizontal line a certain on gold-plated reflecting mirror scanning, as shown in Figure 3.
THz source generates THz wave output, THz wave (intensity I0) with θ0Angle is incident on the first reflection windows
The a part in face 21, THz wave reflects (intensity I through the first reflection windows face 211)；Another part is through the first reflection windows
The transmission of face 21 is simultaneously incident on sample in the second reflection windows 22 with θ angle, and through sample reflection, the second reflection windows face 22 and the
One reflection windows, 21 face is transmitted as (intensity I2), the received light intensity of detector is I1And I2It is superimposed in the second reflection windows face 22.
By using different-thickness reflection windows, it can be achieved that imaging signal to noise ratio change.
When selecting reflection windows with a thickness of 0.53mm, 0.7mm, 0.82mm, I1With I2Phase shift be respectively δ0.53=0.5
π、δ0.7=0.45 π, δ0.82=0, the phase shift mutually grown in interferenceIn range.
It can be obtained by Fig. 3, when reflection windows are with a thickness of 0.53mm, 0.7mm, 0.82mm, imaging signal to noise ratio be respectively may be about
SNR0.53=1.45, SNR0.7=1.2, SNR0.82=1.15, realize the raising of imaging signal to noise ratio.
When selecting reflection windows with a thickness of 0.64mm, 0.84mm, 0.9mm, I1With I2Phase shift be respectively δ0.64=0.75
π、δ0.84=0.85 π, δ0.9=0.99 π, in the phase shift range that interference is subtracted each other.It can be obtained by Fig. 3, when reflection windows thickness
When for 0.64mm, 0.84mm, 0.9mm, imaging signal to noise ratio respectively may be about SNR0.64=0.75, SNR0.84=0.7, SNR0.9=
0.65, imaging signal to noise ratio is declined.
In conclusion the utility model embodiment overcomes the deficiency of existing sampling, imaging is just improved in sample phase
Signal-to-noise ratio, reduction external condition as far as possible influences, and then improves image quality.
It will be appreciated by those skilled in the art that attached drawing is the schematic diagram of a preferred embodiment, above-mentioned the utility model is real
It is for illustration only to apply a serial number, does not represent the advantages or disadvantages of the embodiments.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (4)
1. improving the device of THz wave imaging signal to noise ratio based on reflection windows, which is characterized in that described device includes:
THz wave plane mirror, the first THz wave off axis paraboloidal mirror, the second THz wave off axis paraboloidal mirror, third
THz wave off axis paraboloidal mirror is successively set on the emitting light path of THz wave；
First THz wave off axis paraboloidal mirror is used to the THz wave focusing of output being incident on reflection windows；Second terahertz
Hereby wave off axis paraboloidal mirror is arranged on the signal light emitting light path for putting sampling device, for receiving signal light THz wave；The
The setting of three THz wave off axis paraboloidal mirrors enters spy before THz wave detection, for receiving simultaneously focus signal light THz wave
Survey device；
Detector is arranged on the signal light emitting light path of third THz wave off axis paraboloidal mirror, collect third THz wave from
The reflected light of axis paraboloidal mirror；
Reflection windows are the material saturating to Terahertz wave height, are fixed in two-dimensional scanning platform, to be measured at decent for placing
Product.
2. the device according to claim 1 for improving THz wave imaging signal to noise ratio based on reflection windows, which is characterized in that
The terahertz emission source is continuous or pulse terahertz emission source.
3. the device according to claim 1 for improving THz wave imaging signal to noise ratio based on reflection windows, which is characterized in that
The THz wave plane mirror, the first THz wave off axis paraboloidal mirror, the second THz wave off axis paraboloidal mirror, third
THz wave off axis paraboloidal mirror plates the broadband high-reflecting film of terahertz wave band.
4. the device according to claim 1 for improving THz wave imaging signal to noise ratio based on reflection windows, which is characterized in that
The THz source generates THz wave output, is incident on reflection windows with 30 ° of angles.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821829068.0U CN209513617U (en) | 2018-11-07 | 2018-11-07 | The device of THz wave imaging signal to noise ratio is improved based on reflection windows |
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| CN201821829068.0U CN209513617U (en) | 2018-11-07 | 2018-11-07 | The device of THz wave imaging signal to noise ratio is improved based on reflection windows |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459416A (en) * | 2018-11-07 | 2019-03-12 | 天津大学 | The device and method of THz wave imaging signal to noise ratio is improved based on reflection windows |
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2018
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459416A (en) * | 2018-11-07 | 2019-03-12 | 天津大学 | The device and method of THz wave imaging signal to noise ratio is improved based on reflection windows |
| CN109459416B (en) * | 2018-11-07 | 2023-12-22 | 天津大学 | Device and method for improving terahertz wave imaging signal-to-noise ratio based on reflection window |
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