CN109632095A - A kind of visualization Terahertz power meter and its test method based on cholesteric liquid crystal - Google Patents
A kind of visualization Terahertz power meter and its test method based on cholesteric liquid crystal Download PDFInfo
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- 238000004445 quantitative analysis Methods 0.000 claims description 3
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- 239000004965 Silica aerogel Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/48—Photometry, e.g. photographic exposure meter using chemical effects
- G01J1/50—Photometry, e.g. photographic exposure meter using chemical effects using change in colour of an indicator, e.g. actinometer
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Abstract
Present invention discloses a kind of visualization Terahertz power meter and its test method based on cholesteric liquid crystal, the visualization Terahertz power meter includes the capsule-type cholesteric liquid crystal that naked eyes perceived color regional change is generated with the change of THz intensity, the capsule-type cholesteric liquid crystal includes three-decker, is followed successively by acrylic resin film, cholesteric liquid crystal and carbon black from top to bottom.The equipment and test method all compare simple and effective, more particularly to detect strong THz wave power, quantify the increase of color change area size caused by being absorbed by THz using the thermochromatic effect and thermal diffusion effect of cholesteric liquid crystal.The equipment is not limited by color change saturation, and stablizes practical, does not need any additional component to measure temperature.
Description
Technical field
The present invention relates to a kind of visualization Terahertz power meter and its test method based on cholesteric liquid crystal, can be used for skill
Art field.
Background technique
Terahertz (terahertz, THz) wave is frequency in 0.1-10THz (1THz=1012Hz, corresponding wavelength are 3000-
30 μm) between electromagnetic wave.Since THz wave has unique advantage: lower photon energy, it is suitble to carry out living body to biological tissue
It checks；Skeletal vibration and rotational energy level, the much intermolecular weak interaction (hydrogen of many condensed state matters and large biological molecule
Key etc.) all in THz frequency band；Many nonmetallic, non-polar materials are smaller to the absorption of THz wave, have high permeability；With visible light
It is compared with infrared ray, THz wave has high directionality and stronger cloud and mist penetration capacity simultaneously, is able to achieve G bit/s or more
Wireless transmission rate, it is small etc. by ambient noise interference so that in world today's cross discipline forward position THz science and technology,
It is with important application prospects in safety inspection, biomedicine, lossless detection, high-speed communication numerous areas.As THz system
Key core device THz detector, the promotion and the novel THz detector of research and development to its performance are most important.
In current all kinds of THz detectors, non-coherent detection is only capable of detection THz intensity, and coherent detection needs local oscillations to believe
Number source；And another time domain measurement to THz ultrashort pulse samples or utilizes the electricity of nonlinear crystal frequently with photoconductive antenna
Optical detection method；The detection of the near field THz, generally also needs probe.It is above main all based on electric detection, required circuit system structure
Complexity, expensive, application range is subject to certain restrictions, and many performance indicators have been approached theoretical limit.Based on fuel factor
Golay detector (Golay Cell) can optically measure THz radiation indirectly, and response wave band is wide, and can be in room
The lower work of temperature, but using when be the stability for ensuring gas in its gas chamber, position is relatively fixed, and maximum probe power also compares
It is low, for example, a THz power meter based on the Golay only up to 10 μ W of current TYDEX company, and the reaction time is long, it is general only to use
In the slow occasion of radiation variation.It is badly in need of at present a kind of at low cost, structure is simple, there is the novel THz detector in extensive market.By
Beneficial to the Detection Techniques that visible light wave range is highly sensitive, THz radiation can be converted to visible light, it is special by the variation for analyzing visible light
Property obtains many reference amounts correlation properties such as frequency, amplitude, phase and polarization of THz wave.Therefore, THz spoke is optically measured
It penetrates, still has very large space that can open up.In recent years, the substitution heat detection skill using cholesteryl liquid crystal (CLC) has been had already appeared
Art.The CLC imager that keilmann and Renk rollout is radiated for 337 μm.Woolard et al. reports one kind and is used for
The CLC imager of Terahertz quantum cascaded laser, but both single-frequency THz radiations, practical performance are low.
Summary of the invention
The object of the invention is to propose a kind of based on cholesteric phase liquid to solve the above-mentioned problems in the prior art
Brilliant visualization Terahertz power meter and its test method.
A kind of the purpose of the invention will be achieved through the following technical solutions: visualization terahertz based on cholesteric liquid crystal
Hereby power meter, the visualization Terahertz power meter include generating naked eyes perceived color regional change with the change of THz intensity
Capsule-type cholesteric liquid crystal, the capsule-type cholesteric liquid crystal includes three-decker, is followed successively by propylene from top to bottom
Acid resin film, cholesteric liquid crystal and carbon black.
Preferably, the cholesteric liquid crystal dispersion in organic solvent, is applied directly on acrylate resin layer.
Preferably, the carbon black is adhered to the back side of cholesteric liquid crystal.
Preferably, the drop capsule that the diameter of the cholesteric liquid crystal is 10~20 μm.
Present invention further teaches a kind of test method for visualizing Terahertz power meter based on cholesteric liquid crystal, this method
Include the following steps:
S1: it is calibrated using radiant power of the pyroelectric detector to Terahertz meter；
S2: image taking is carried out to the image under different THz power using intelligent apparatus；
S3: the CCLCF image based on tone that S2 step obtains is analyzed and processed using ImageJ software, to gained
The tone value of image extracts, and carries out quantitative analysis to tone value to get to the image of quantized color variation, passes through CCLCF
The region of color change obtains the corresponding relationship with THz power to quantify THz intensity of wave.
Preferably, in the S2 step, the intelligent apparatus is the intelligent apparatus with bluetooth.
Preferably, in the S3 step, the software is ImageJ software.
Preferably, in the S3 step, THz threshold values are about 0.07mW, can produce macroscopic color at this time
Variation, when being greater than the threshold value, the relationship of color change diameter and THz power with approximately linear.
The invention adopts the above technical scheme compared with prior art, has following technical effect that
Using the thermo-chromic effects and thermal diffusion effect of temperature sensitive CLC, by the region of CCLCF color change come
Quantify THz intensity of wave, and therefore this variation is not visually as it can be seen that need any additional electronic equipment, power supply or connecting cable,
This device structure is simple, carries convenient for preparation.
Under high THz power density, thermochromatic effect and thermal diffusion effect exist simultaneously in CLC always.Therefore, the equipment
It is not limited by color change saturation.This hot detection technique has the characteristics that stable, practical, easily studied.
The CCLCF film of preparation has flexibility and pressure insensitivity, therefore is easy to extended operation, preparation method letter
Just, efficiently, easy to use, effective at room temperature, device performance is stablized, and indices reach the practical of Terahertz photonic device
It is required that.
The present invention is able to achieve the THz wave power meter for measuring very high THz power density to be a kind of, which can
To detect THz intensity in wider frequency range, had a wide range of applications in fields such as THz imaging, bio-sensing and detections
Prospect.
Detailed description of the invention
Fig. 1 is the schematic diagram of visualization Terahertz power meter CCLCF based on cholesteric liquid crystal of the invention a kind of.
Fig. 2 is the influence diagram of temperature of the invention to the THz absorption spectrum of CCLCF.
Fig. 3 is the measurement system diagram of the invention tested based on a kind of power of the CCLCF to THz source.
Fig. 4 is the power progress test schematic diagram of the invention based on CCLCF to a kind of THz source, and THz light beam passes through
Off axis paraboloidal mirror (PM) is focused on CCLCF.
Fig. 5 is the power progress test schematic diagram of the invention based on CCLCF to a kind of THz source, the THz wink of measurement
State waveform and its fourier spectrum characteristic.
Fig. 6 is the signal that use of the invention is shot under different Terahertz intensity with the smart phone camera of bluetooth
Figure.
Fig. 7 is the color change situation under the different THz wave irradiation times of display of the invention.
Fig. 8 is the color change situation under the different THz wave irradiation times of display of the invention.
Fig. 9 is the relational graph of the invention when terahertz emission 1 second, between THz power and transient state color change area.
Specific embodiment
The purpose of the present invention, advantage and feature, by by the non-limitative illustration of preferred embodiment below carry out diagram and
It explains.These embodiments are only the prominent examples using technical solution of the present invention, it is all take equivalent replacement or equivalent transformation and
The technical solution of formation, all falls within the scope of protection of present invention.
Present invention discloses a kind of visualization Terahertz power meter based on cholesteric liquid crystal, the visualization Terahertz function
Rate meter includes the capsule-type cholesteric liquid crystal that naked eyes perceived color regional change is generated with the change of THz intensity, the glue
Bladder type cholesteric liquid crystal 10 includes three-decker, is followed successively by acrylic resin film 1, cholesteric liquid crystal 2 and charcoal from top to bottom
Black 3.The capsule-type cholesteric liquid crystal is referred to as CCLCF (Capsulized Cholesteric Liquid Crystal
Film)。
The cholesteric liquid crystal dispersion in organic solvent, is applied directly on acrylate resin layer, the carbon black adherency
At the back side of cholesteric liquid crystal, drop capsule that the diameter of the cholesteric liquid crystal is 10~20 μm.
Present invention further teaches a kind of test method for visualizing Terahertz power meter based on cholesteric liquid crystal, this method
Include the following steps:
S1: it is calibrated using radiant power of the pyroelectric detector to Terahertz meter；
S2: image taking is carried out to the image under different THz power using intelligent apparatus；It is described in the S2 step
Intelligent apparatus is the intelligent apparatus with bluetooth.
S3: the CCLCF image based on tone that S2 step obtains is analyzed and processed using ImageJ software, to gained
The tone value of image extracts, and carries out quantitative analysis to tone value to get to the image of quantized color variation, passes through CCLCF
The region of color change obtains the corresponding relationship with THz power to quantify THz intensity of wave.In the S3 step, the software
For ImageJ software, THz threshold values are about 0.07mW, can produce macroscopic color change at this time, when greater than the threshold value
When, the relationship of color change diameter and THz power with approximately linear.
CLC has the intrinsic self organization ability of helical structure, and screw pitch depends on temperature, and selective reflecting wavelength depends on
In screw pitch.Terahertz emission can cause the raising of CLC temperature, to change screw pitch.Therefore, it is inhaled using the part of terahertz emission
The heat of generation is received to improve the temperature of CCLCF.At this point, the screw pitch of CCLC shortens, macroscopic color change is also resulted in
With the increase of area.Especially when terahertz emission is focused, color change is clearly shown under high THz power density
Diffusion phenomena.By analyzing image, and then measure THz radiation.Cholesteric liquid crystal is referred to as CLC, English name are as follows:
Cholesteric Liquid Crystal。
The present invention has the characteristic of different responses using CCLCF under different THz power, realizes quantifying for THz power
Visualization.Implement technical solution are as follows:
Design prepares cholesteric liquid crystal CCLCF, the structure by up of three-layer, middle layer be packaged into 10 μm of diameter~
20 μm of CLCs drop, is dispersed in organic solvent and is applied directly on acrylate resin layer, for convenience of color is observed
Variation, silica aerogel layer is adhered to from the back side to form complete CCLCF structure in middle layer, size is designed as
1.5cm×2.5cm。
For the quantitative visualization for realizing THz power, it is necessary to use the overdelicate cholesteric liquid crystal CLC of temperature.Such as Fig. 2 institute
Show, Fig. 2 is influence diagram of the temperature to the THz absorption spectrum of CCLCF, and the ordinate in Fig. 2 indicates absorptivity, and abscissa indicates frequency
Rate.For CCLCF thermo-varing liquid crystal to temperature hypersensitive, the curve in Fig. 2 indicates the THz absorption spectra under different temperatures, entire THz
Absorption region is 0-3THz.As shown in Fig. 2, at room temperature at 23.8 DEG C, reflected light is green, the face when temperature reaches 25.5 DEG C
Discoloration is that blue is heavy shade, and temperature at this time increases only 1.7 DEG C.CCLCF omits the absorptivity of THz when temperature is 25.5 DEG C
Greater than temperature be 23.8 DEG C when absorptivity, show CCLCF to THz absorb it is almost temperature independent.The oscillation of THz absorption spectrum
It is the interference effect as caused by the multiple reflections of CCLCF, terahertz emission can cause the raising of CLC temperature, to change screw pitch.
Therefore, THz power can be detected by measurement reflection wavelength.Cause the color change of CLC that can pass through naked eyes by THz wave simultaneously
It observes directly.And under high THz power density, it can not be saturated and be limited by color using the thermal diffusion effect in CLC,
It is particularly suitable for detection high power THz wave.
Specific test macro is as shown in Fig. 3, which includes grating 30, lens L1, lens L2, off axis paraboloid mirror
Mirror PM1, PM2, PM3, LiNbO3Crystal 50, optical filter 60 and THz polarizer 70.The system is for generating the source THz, capsule-type gallbladder
Steroid phase liquid crystal film is used to measure the power of the system.
The source THz pumps LiNbO by femto-second laser3Crystal is generated using inclination wave-front method.Femto-second laser Legend
Elite (not shown), central wavelength 800nm, optical power 4W, pulse width 100fs, repetition rate 1kHz.Fly
Second laser pump (ing) pulse is incident on lithium columbate crystal by grating, lens L1-L2, and the THz generated from lithium columbate crystal passes through
Off axis paraboloidal mirror PM1, PM2, PM3 are focused.Capsule-type cholesteric liquid crystal is placed in focal point and is tested.Black poly- third
Alkene optical filter is used for other radiation for stopping extra pumping laser and generating with THz.It is changeable by rotation THz polarizer
The source strength of THz.Using the smart phone image shot by camera for having wireless blue tooth technology, not only facilitate, but also be able to achieve
Mobile detection.Because CCLCF to the sensitivity characteristic of temperature, need by temperature control it is certain at room temperature, here CCLCF just
Beginning temperature is 23.8 DEG C.
Fig. 4 is THz transient waveform figure, and the ordinate of Fig. 4 indicates THz electric field strength, and abscissa indicates the time.Fig. 4 is indicated
It is focused on CCLCF for THz light beam by off axis paraboloidal mirror (PM).It is obtained with THz camera (IRV-T0831, NEC)
About 300 μm of THz beam and focus.Using industrial pyroelectric detector (THz-5B-MT, Gentec-EO) to terahertz emission function
Rate is calibrated and is measured, and obtains in system maximum average THz power (Pmax) being 2.6mW.Therefore, maximum THz power density
Up to 4.0 × 103mW/cm2.Fig. 5 is expressed as the THz transient waveform and its fourier spectrum characteristic of measurement, can be intuitive from Fig. 5
Find out that spectral region is concentrated mainly between 0-1THz, the ordinate of Fig. 5 indicates THz intensity, and abscissa indicates frequency.
Embodiment 1:
The present embodiment is the pass of THz watt level and response time and CCLCF color change diameter under thermal equilibrium state
System.If Fig. 6 shows the direct visualizztion under different THz power, image shows the increase due to THz intensity and occurs apparent
Temperature increases and thermal diffusion, and color change diameter increases.For convenient for image analysis, using ImageJ software to based on tone
CCLCF image is handled.Fig. 7 indicates that under thermal equilibrium state, the diameter of color change increases with the increase of Terahertz power
Greatly, Fig. 7 gives under stable state, the relationship between color change diameter and THz power.The ordinate of Fig. 7 indicates color change area
The diameter in domain, abscissa indicate THz power.Detectable THz threshold value is about 0.07mW, be can produce at this time macroscopic
Color change.When being greater than threshold value, the relationship of diameter and THz power with approximately linear.Even if THz power density is more than 4.0
×103mW/cm2, film remains to work well.Relationship between response time and THz power as shown in figure 8, Fig. 8 vertical seat
Mark indicates that the diameter in color change region, abscissa indicate the time.Fig. 8 shows under the terahertz emission of 1.3mW and 2.6mW,
Variation color diameter increase with the increase of response time, as can see from Figure 8 under thermal equilibrium state CCLCF not
There is different responses under same THz power.Thermal diffusion is faster than in low THz power under high THz power, but stable diameter is big
It is more, therefore the response time is slower.When THz power is up to 2.6mW, reaches balance and need about 30 seconds, and in 1.3mW,
Stablizing the time is about 15 seconds.It is under 2,5,28 and 30 seconds radiated times, by the 2.6mW or less of camera shooting shown in illustration
Image, intuitively show diameter change with the increase of response time.
Embodiment 2:
The present embodiment be in a transient state, at terahertz emission 1 second, the pass of THz power and transient state color change area
System.As shown in Fig. 1, preparation method is same as Example 1 for specific structure design.Transient detection can by thermal balance it
The measurement at a preceding time point and be quickly obtained THz power.Change THz power, and the face of detection zone by rotation wiregrating
Color change.When wire-grid polarizer θ=0 ° (parallel with the polarization of THz wave), transmitted without THz.Then, polarizer angles are changed
Become 40 °, 60 ° and 80 °, obtains radiation image from the illustration shot with smart phone.The ordinate of Fig. 9 indicates THz power,
The area in abscissa expression color change region.Fig. 9 is THz power and transient state color change area when terahertz emission 1 second
Between relational graph, it will be seen from figure 9 that CCLCF area change is significantly different to different Terahertz power.Here it is based on
The image analysis that the tone that digital value is 122 carries out.THz intensity and color change are not only obtained based on this method for fast measuring
The directly proportional relationship of area, have also obtained the quantitative assessment of THz power Yu color change area approximation parabolic relation.
The equipment and test method all compare simple and effective, more particularly to detect strong THz wave power, utilize the thermocolour of CLC
Effect and thermal diffusion effect quantify the increase of color change area size caused by being absorbed by THz.The equipment is not become by color
Change the limitation of saturation, and stablize practical, does not need any additional component to measure temperature.
The technical program its using capsule-type cholesteric liquid crystal (CCLCF) thermo-chromic effects and thermal diffusion imitate
It answers, in the case where the THz amplitude of different capacity is shone, by quantization macroscopic CCLCF color change region, detects THz intensity of wave,
To realize a kind of visual THz wave power meter.This novel THz power meter have flexible, it is at low cost, be convenient for
The characteristics such as carrying, can be used for THz imaging, and the fields such as THz bio-sensing and THz detection are with a wide range of applications.
Still there are many embodiment, all technical sides formed using equivalents or equivalent transformation by the present invention
Case is within the scope of the present invention.
Claims (8)
1. a kind of visualization Terahertz power meter based on cholesteric liquid crystal, it is characterised in that: the visualization Terahertz power
Meter includes the capsule-type cholesteric liquid crystal that naked eyes perceived color regional change is generated with the change of THz intensity, the capsule
Type cholesteric liquid crystal includes three-decker, is followed successively by acrylic resin film (1), cholesteric liquid crystal (2) and charcoal from top to bottom
Black (3).
2. a kind of visualization Terahertz power meter based on cholesteric liquid crystal according to claim 1, it is characterised in that: institute
It states cholesteric liquid crystal dispersion in organic solvent, is applied directly on acrylate resin layer (1).
3. a kind of visualization Terahertz power meter based on cholesteric liquid crystal according to claim 1, it is characterised in that: institute
State the back side that carbon black (3) is adhered to cholesteric liquid crystal (2).
4. according to claim 1, it is characterised in that: the drop that the diameter of the cholesteric liquid crystal (2) is 10~20 μm
Capsule.
5. a kind of test method of the visualization Terahertz power meter based on cholesteric liquid crystal, it is characterised in that: this method includes
Following steps:
S1: it is calibrated using radiant power of the pyroelectric detector to Terahertz meter；
S2: image taking is carried out to the image under different THz power using intelligent apparatus；
S3: the CCLCF image based on tone that S2 step obtains is analyzed and processed using ImageJ software, to gained image
Tone value extract, to tone value carry out quantitative analysis to get to quantized color variation image, pass through CCLCF color
The region of variation obtains the corresponding relationship with THz power to quantify THz intensity of wave.
6. a kind of test method of visualization Terahertz power meter based on cholesteric liquid crystal according to claim 5,
Be characterized in that: in the S2 step, the intelligent apparatus is the intelligent apparatus with bluetooth.
7. a kind of test method of visualization Terahertz power meter based on cholesteric liquid crystal according to claim 5,
Be characterized in that: in the S3 step, the software is ImageJ software.
8. a kind of test method of visualization Terahertz power meter based on cholesteric liquid crystal according to claim 5,
Be characterized in that: in the S3 step, THz threshold values are about 0.07mW, can produce macroscopic color change at this time, when
When greater than the threshold value, the relationship of color change diameter and THz power with approximately linear.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20080179519A1 (en) * | 2007-01-30 | 2008-07-31 | Radiabeam Technologies, Llc | Terahertz camera |
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| CN111551516A (en) * | 2020-05-14 | 2020-08-18 | 南京邮电大学 | Efficient visual terahertz detector and preparation and test methods thereof |
| CN111551516B (en) * | 2020-05-14 | 2023-03-14 | 南京邮电大学 | Efficient visual terahertz detector and preparation and test methods thereof |
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| CN109632095B (en) | 2020-11-03 |
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