Handheld integrated terahertz detection sensor

Abstract

The utility model discloses a handheld integrated terahertz detection sensor. The handheld integrated terahertz detection sensor comprises a fixing tool module, a terahertz light path module and a handheld shell, the fixing tool module is installed in the handheld shell. The terahertz light path module comprises a terahertz emitting light path assembly, a focusing lens and a terahertz receiving photoelectric assembly, the reflector is installed at the front end of the handheld shell, and the terahertz emitting light path assembly and the terahertz receiving photoelectric assembly are installed in the fixing tool module. The terahertz emission light path assembly and the terahertz receiving photoelectric assembly are installed in the same direction, terahertz wave beams emitted by the terahertz emission light path assembly are transmitted to the focusing lens, and reflection echoes carrying sample characteristics are converged by the focusing lens and are reflected to the terahertz receiving photoelectric assembly. According to the utility model, the difficulty of single-point detection is reduced, flexible, high-precision and real-time online adjustment of a detection position is realized, meanwhile, the whole detection light path is highly integrated, the difficulty of light path adjustment is greatly reduced, and the device is suitable for various working conditions.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of terahertz detection technology, concretely to a hand -held integrated terahertz detection sensor. BACKGROUND

[0002] The wideband pulse terahertz source generates terahertz waves based on ultra-short laser pulses using photoconductive antennas, and the generation process is carried out in an integrated optical fiber environment, which is less affected by the external environment. However, during the detection process, the terahertz waves pass through a half-transmission half-reflection mirror and a focusing mirror to reach the sample, and after being reflected by the sample, the reflected echo carrying the sample characteristics is transmitted to the photoconductive antenna of the terahertz receiver through the half-transmission half-reflection mirror and the reflecting mirror. This process is greatly affected by the external environment. At the same time, the reflecting terahertz detection device has very strict requirements for the optical path, and the eccentricity, tilt and displacement of the collimating lens, focusing lens and half-transmission half-reflection mirror will affect the signal strength and signal-to-noise ratio, which will affect the detection effect.

[0003] The existing reflecting terahertz detection device is usually assembled on a guide rail or a mechanical hand, which has the defects of slow adjustment speed, complicated assembly steps, the need for path planning in advance, and the inability to quickly detect the position of a single point at any time. When adjusting, the detection position and the assembly position of the guide rail or the mechanical hand need to be observed at the same time to avoid collision with the measured object. At the same time, the detection range of the existing industrial detection device is limited, and the overall weight is large, which cannot realize real-time online adjustment. SUMMARY

[0004] In view of the problems existing in the existing reflecting terahertz detection device, the utility model provides a hand -held integrated terahertz detection sensor, reduces the difficulty of single point detection, realizes the flexible, high-precision, real-time online adjustment of detection position, at the same time, the whole detection optical path is highly integrated, greatly reduces the difficulty of optical path adjustment, and is suitable for various working conditions.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] A hand -held integrated terahertz detection sensor, including fixed tool module, terahertz optical path module, hand -held shell, the fixed tool module is installed in hand -held shell, the terahertz optical path module includes terahertz emission optical path assembly, focusing lens, terahertz receiving photoelectric component, the focusing lens is installed at the front end of hand -held shell, and the terahertz emission optical path assembly and the terahertz receiving photoelectric component are installed in the fixed tool module respectively, the terahertz emission optical path assembly is installed with the terahertz receiving photoelectric component in the same direction, the terahertz wave beam of the terahertz emission optical path assembly is transmitted to the focusing lens, and the reflected echo carrying the sample characteristics is converged by the focusing lens and transmitted to the terahertz receiving photoelectric component.

[0007] Further, the terahertz emission optical path assembly comprises a terahertz emission antenna, a first collimating lens and a thin film beam splitter; the terahertz receiving optical path assembly comprises a reflector, a second collimating lens and a terahertz receiving antenna; the terahertz emission antenna and the terahertz receiving antenna are arranged in the same direction, and are fixed on the fixing tool module respectively, with the terahertz receiving antenna being above the terahertz emission antenna; the first collimating lens is installed on the fixing tool module and located in front of the terahertz emission antenna; the thin film beam splitter is fixed on the fixing tool module and located in front of the first collimating lens; the second collimating lens is fixed on the fixing tool module and located in front of the terahertz receiving antenna; the reflector is fixed on the upper surface of the fixing tool module, with the reflecting part of the reflector being parallel to the thin film beam splitter and located in front of the light path of the second collimating lens; the terahertz beam emitted by the terahertz emission antenna is obliquely incident on the thin film beam splitter after passing through the first collimating lens, is transmitted through the thin film beam splitter to the focusing lens, is converged after passing through the focusing lens, and the detected sample is located at the focal plane; the reflected echo carrying the interfaces of the sample is converged by the focusing lens and is incident on the thin film beam splitter again, is transmitted through the thin film beam splitter to the reflector, is converged by the second collimating lens and is incident on the terahertz receiving antenna.

[0008] Further, the terahertz optical path module further comprises a terahertz wave absorber, which is installed on the fixing tool module and located below the thin film beam splitter; the terahertz beam emitted by the terahertz emission antenna is obliquely incident on the thin film beam splitter, and after passing through the thin film beam splitter, a part of the terahertz wave is transmitted to the focusing lens, and the other part of the terahertz wave is reflected to the terahertz wave absorber.

[0009] Further, the incident terahertz wave of the terahertz emission antenna is incident on the thin film beam splitter at an angle of 45°.

[0010] Further, the focusing lens is installed on the focusing lens barrel by pressing, and the focusing lens barrel is installed on the front surface of the front end of the handheld shell.

[0011] Further, the fixed tool module comprises a comprehensive installation base, a beam splitter installation base and an installation plate; the comprehensive installation base and the beam splitter installation base are fixed on the installation plate respectively, and the beam splitter installation base is located at the front end of the comprehensive installation base; the comprehensive installation base is a shell structure, and a receiving antenna positioning hole and a transmitting antenna positioning hole are respectively formed in the front of the comprehensive installation base, and the receiving antenna positioning hole is located above the transmitting antenna positioning hole; the terahertz transmitting antenna is installed on the comprehensive installation base through the transmitting antenna positioning hole; the first collimating lens is fixed at the opening of the receiving antenna positioning hole; the terahertz receiving antenna is installed on the comprehensive installation base through the receiving antenna positioning hole; and the second collimating lens is fixed at the opening of the receiving antenna positioning hole; the beam splitter installation base is a shell structure, and a beam splitter limiting groove is formed in the front surface of the beam splitter installation base; and the thin film beam splitter is fixed in the beam splitter limiting groove.

[0012] Further, the handheld shell comprises a right shell and a left shell, and the right shell and the left shell are fixed through screws; and the focusing lens barrel is fixed between the right shell and the left shell and located at the front end surface of the handheld shell.

[0013] Further, a silica gel sealing ring is arranged at the joint of the right shell and the left shell.

[0014] Further, a display screen is further arranged on the handheld shell, and the display screen is fixed between the right shell and the left shell and located at the rear end surface of the handheld shell.

[0015] Compared with the prior art, the device has the following beneficial effects:

[0016] The device realizes integrated design of the reflective terahertz detection device, the beam splitter is a thin film beam splitter, the influence of secondary echo signals on subsequent data processing is avoided, and the signal noise ratio is improved. The whole optical path is in a closed environment, the optical path is protected from external environment interference, and is suitable for complex working environments.

[0017] The device adopts a fiber and wire separation type fixing mode, so that the overall structure is more compact. The transmitting antenna and the receiving antenna are arranged in the same direction to reduce the complexity of the structure and use fewer optical elements, improve the integration of the device, and reduce the adjustment difficulty of the reflective terahertz single-point detection system. Compared with the traditional terahertz probe, the handheld integrated terahertz system single-point detection optical lens of the device can realize real-time detection and fast focusing, and reduce the operation difficulty of the system. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a schematic diagram of an optical path principle of a handheld integrated terahertz detection sensor according to the present application;

[0019] Figure 2The fixed tool module isosceles view of the embodiment of the utility model;

[0020] Figure 3 The terahertz optical path module section view of the embodiment of the utility model;

[0021] Figure 4 The handheld shell isosceles view of the embodiment of the utility model;

[0022] In the drawing,

[0023] 101-comprehensive installation base, 102-beam splitter installation base, 103-installation plate,

[0024] 201-terahertz transmitting antenna, 202-terahertz receiving antenna, 203-first collimating lens, 204-second collimating lens, 205-thin film beam splitter, 206-mirror, 207-terahertz wave absorber, 208-focusing lens, 209-focusing lens installation lens barrel,

[0025] 301-right shell, 302-left shell, 303-display screen. DETAILED DESCRIPTION

[0026] The technical scheme in the embodiment of the utility model will be described clearly and completely in combination with the drawings in the embodiment of the utility model. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the protection scope of the utility model.

[0027] The embodiment is a handheld integrated terahertz detection sensor, as shown in the drawing, Figures 1 to 4 The terahertz optical path module section view of the embodiment of the utility model, including fixed tool module, terahertz optical path module, handheld shell, the terahertz optical path module includes terahertz transmitting optical path assembly, focusing lens 208, terahertz receiving photoelectric assembly, the focusing lens 208 is installed at the front end of handheld shell, and terahertz transmitting optical path assembly and terahertz receiving photoelectric assembly are installed in fixed tool module respectively, terahertz transmitting optical path assembly and terahertz receiving photoelectric assembly are installed in the same direction, and the terahertz wave beam emitted by terahertz transmitting optical path assembly is transmitted to focusing lens 208 after being split, and the reflection echo carrying the characteristics of sample is converged by focusing lens 208 and is reflected to terahertz receiving photoelectric assembly again after being split again, and fixed tool module is installed in handheld shell.

[0028] As shown in Figure 3, the terahertz optical path module is composed of a terahertz transmitting antenna 201, a first collimating lens 203, a thin film beam splitter 205, a focusing lens 208, a focusing lens mounting lens barrel 209, a reflecting mirror 206, a second collimating lens 204, a terahertz receiving antenna 202, and a terahertz wave absorber 207. The terahertz transmitting antenna 201, the first collimating lens 203, and the thin film beam splitter 205 constitute the terahertz transmitting optical path assembly, and the reflecting mirror 206, the second collimating lens 204, and the terahertz receiving antenna 202 constitute the terahertz receiving optical path assembly. The terahertz transmitting antenna 201 and the terahertz receiving antenna 202 are arranged in the same direction, and the terahertz transmitting antenna 201 and the terahertz receiving antenna 202 are respectively fixed on the comprehensive mounting base 101 of the fixing tool module by screws, and the terahertz receiving antenna 202 is located above the terahertz transmitting antenna 201. The first collimating lens 203 is mounted at the opening of the transmitting antenna positioning hole on the comprehensive mounting base 101, and the first collimating lens 203 is located in front of the terahertz transmitting antenna 201 and coaxial with the optical path of the terahertz transmitting antenna 201. The thin film beam splitter 205 is fixed in the beam splitter limiting groove of the beam splitter mounting base 102 of the fixing tool module by a nylon screw, and the thin film beam splitter 205 is located in front of the first collimating lens 203, and the incident terahertz wave of the terahertz transmitting antenna 201 is incident at an angle of 45° with the thin film beam splitter. The second collimating lens 204 is fixed at the opening of the receiving antenna positioning hole on the comprehensive mounting base 101 of the fixing tool module, and the second collimating lens 204 is located in front of the terahertz receiving antenna 202 and coaxial with the optical path of the terahertz receiving antenna 202. The reflecting mirror 206 is fixed on the upper surface of the comprehensive mounting base 101 of the fixing tool module by a screw, and the reflecting part of the reflecting mirror 206 is parallel to the thin film beam splitter 205 and located in front of the optical path of the second collimating lens 204. The terahertz wave absorber 207 is mounted on the mounting plate 103 of the fixing tool module and located below the thin film beam splitter 205. The focusing lens 208 is mounted on the focusing lens lens barrel 209 by a compression ring, and the focusing lens lens barrel 209 is mounted on the front surface of the front end of the handheld shell.

[0029] The terahertz wave beam emitted by the terahertz transmitting antenna 201 is obliquely incident on the thin film beam splitter 205 through the first collimating lens 203, a part of the terahertz wave is reflected onto the terahertz wave absorber 207 after passing through the thin film beam splitter 205, and the other part of the terahertz wave is transmitted to the focusing lens 208. The terahertz wave converges after passing through the focusing lens 208, and the detected sample is located at the focal plane. The reflected echo carrying the interfaces of the sample is converged by the focusing lens 208 and incident on the thin film beam splitter 205 again, reflected to the reflecting mirror 206, converged by the second collimating lens 204 to the terahertz receiving antenna 202, and the terahertz non-destructive detection of the sample is realized.

[0030] As shown in Figure 4, the terahertz optical path module is composed of a terahertz transmitting antenna 301, a first collimating lens 303, a thin film beam splitter 305, a focusing lens 308, a focusing lens mounting lens barrel 309, a reflecting mirror 306, a second collimating lens 304, a terahertz receiving antenna 302, and a terahertz wave absorber 307. The terahertz transmitting antenna 301, the first collimating lens 303, and the thin film beam splitter 305 constitute the terahertz transmitting optical path assembly, and the reflecting mirror 306, the second collimating lens 304, and the terahertz receiving antenna 302 constitute the terahertz receiving optical path assembly. The terahertz transmitting antenna 301 and the terahertz receiving antenna 302 are arranged in the same direction, and the terahertz transmitting antenna 301 and the terahertz receiving antenna 302 are respectively fixed on the comprehensive mounting base 101 of the fixing tool module by screws, and the terahertz receiving antenna 302 is located above the terahertz transmitting antenna 301. The first collimating lens 303 is mounted at the opening of the transmitting antenna positioning hole on the comprehensive mounting base 101, and the first collimating lens 303 is located in front of the terahertz transmitting antenna 301 and coaxial with the optical path of the terahertz transmitting antenna 301. The thin film beam splitter 305 is fixed in the beam splitter limiting groove of the beam splitter mounting base 102 of the fixing tool module by a nylon screw, and the thin film beam splitter 305 is located in front of the first collimating lens 303, and the incident terahertz wave of the terahertz transmitting antenna 301 is incident at an angle of 45° with the thin film beam splitter. The second collimating lens 304 is fixed at the opening of the receiving antenna positioning hole on the comprehensive mounting base 101 of the fixing tool module, and the second collimating lens 304 is located in front of the terahertz receiving antenna 302 and coaxial with the optical path of the terahertz receiving antenna 302. The reflecting mirror 306 is fixed on the upper surface of the comprehensive mounting base 101 of the fixing tool module by a screw, and the reflecting part of the reflecting mirror 306 is parallel to the thin film beam splitter 305 and located in front of the optical path of the second collimating lens 304. The terahertz wave absorber 307 is mounted on the mounting plate 103 of the fixing tool module and located below the thin film beam splitter 305. The focusing lens 308 is mounted on the focusing lens lens barrel 309 by a compression ring, and the focusing lens lens barrel 309 is mounted on the front surface of the front end of the handheld shell. Figure 2As shown, the fixed tool module is composed of a comprehensive mounting base 101, a beam splitter mounting base 102 and a mounting plate 103; the comprehensive mounting base 101 and the beam splitter mounting base 102 are fixed on the mounting plate 103 by screws respectively, and the beam splitter mounting base 102 is located at the front end of the comprehensive mounting base 101; the comprehensive mounting base 101 is a shell structure, and a receiving antenna positioning hole and a transmitting antenna positioning hole are respectively formed in the front of the comprehensive mounting base 101, and the receiving antenna positioning hole is located above the transmitting antenna positioning hole; the terahertz transmitting antenna 201 is installed on the comprehensive mounting base 101 through the transmitting antenna positioning hole, the first collimating lens 203 is fixed at the opening of the receiving antenna positioning hole, the terahertz receiving antenna 202 is installed on the comprehensive mounting base 101 through the receiving antenna positioning hole, and the second collimating lens 204 is fixed at the opening of the receiving antenna positioning hole; the beam splitter mounting base 102 is a shell structure, the front surface of the beam splitter mounting base 102 is a slope, and a beam splitter limiting groove is formed in the front surface of the beam splitter mounting base 102; the film beam splitter 205 is fixed in the beam splitter limiting groove by nylon screws.

[0031] As shown in the figure, Figure 4 As shown in the figure, the handheld shell is composed of a right shell 301, a left shell 302 and a display screen 303; the right shell 301 and the left shell 302 are fixed by screws; the focusing lens barrel 209 is fixed between the right shell 301 and the left shell 302 and located at the front end surface of the handheld shell; the display screen 303 is fixed between the right shell 301 and the left shell 302 and located at the rear end surface of the handheld shell. The junction of the right shell 301 and the left shell 302 is provided with a silica gel sealing ring. The display screen 303 is connected with the host computer by a cable and displays the detected terahertz signal waveform in real time.

[0032] In this embodiment, when the film beam splitter 205 is installed, the lower surface of the film beam splitter 205 is ensured to be attached to the corresponding limiting groove of the beam splitter fixing base 102, and the beam splitter fixing screw is tightened to ensure that the signal reflected back through the sample can return to the terahertz receiving antenna 202.

[0033] In this embodiment, the film beam splitter is used, which can eliminate the echo signal introduced by multiple reflections in the beam splitter. The terahertz signal is reflected to the terahertz receiving antenna 202, and the remaining reflected or transmitted signals will be absorbed due to the presence of the wave absorber 207. The detected terahertz signal is no longer in the same optical path and will not enter the terahertz receiving antenna 202, thereby improving the signal-to-noise ratio.

[0034] The working principle of this embodiment is briefly introduced as follows:

[0035] The terahertz emission antenna 201 emits a terahertz beam with a certain divergence angle, and the terahertz beam is obliquely incident on the thin film beam splitter 205; the incident terahertz wave is incident at an angle of 45° with the beam splitter to ensure the collimation of the optical path and improve the utilization of optical energy;

[0036] When the terahertz wave is incident on the thin film beam splitter 205, a part of the terahertz wave is transmitted to the focusing lens 208, and the other part of the terahertz wave is reflected to the terahertz wave absorber 207, so as to avoid the reflected terahertz wave in the fixed tooling module to come back and forth, reduce the interference to the signal, and improve the signal-to-noise ratio;

[0037] The terahertz wave is converged after passing through the focusing lens 208, and the detected sample is located at the focal plane; after passing through the detected sample, the reflected echo carrying the interfaces of the sample is converged by the focusing lens 208 and is incident on the thin film beam splitter 205 again;

[0038] The terahertz wave is transmitted through the thin film beam splitter 205 to the reflector 206, is converged by the second collimating lens 204 to the terahertz receiving antenna 202, and the terahertz nondestructive detection of the sample is realized.

[0039] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the present application, and is not intended to limit the present application; any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A hand-held integrated terahertz detection sensor, characterized by, The application relates to a handheld terahertz detection device, which comprises a fixed tool module, a terahertz light path module and a handheld shell; the fixed tool module is installed in the handheld shell; the terahertz light path module comprises a terahertz emission light path assembly, a focusing lens and a terahertz receiving photoelectric assembly; the focusing lens is installed at the front end of the handheld shell; the terahertz emission light path assembly and the terahertz receiving photoelectric assembly are respectively installed in the fixed tool module; the terahertz emission light path assembly and the terahertz receiving photoelectric assembly are installed in the same direction; the terahertz wave beam emitted by the terahertz emission light path assembly is transmitted to the focusing lens; and the reflection echo carrying the sample features is converged by the focusing lens and transmitted to the terahertz receiving photoelectric assembly.

2. The handheld integrated terahertz detection sensor of claim 1, wherein, The terahertz emission light path assembly comprises a terahertz emission antenna, a first collimating lens and a thin film beam splitter; the terahertz receiving light path assembly comprises a reflector, a second collimating lens and a terahertz receiving antenna; the terahertz emission antenna and the terahertz receiving antenna are arranged in the same direction; the terahertz emission antenna and the terahertz receiving antenna are respectively fixed on the fixed tool module and the terahertz receiving antenna is located above the terahertz emission antenna; the first collimating lens is installed on the fixed tool module and located in front of the terahertz emission antenna; the thin film beam splitter is fixed on the fixed tool module and located in front of the first collimating lens; the second collimating lens is fixed on the fixed tool module and located in front of the terahertz receiving antenna; the reflector is fixed on the upper surface of the fixed tool module; the reflection part of the reflector is parallel to the thin film beam splitter and located in front of the light path of the second collimating lens; The terahertz wave beam emitted by the terahertz emission antenna is obliquely incident on the thin film beam splitter after passing through the first collimating lens, is transmitted to the focusing lens through the thin film beam splitter, is converged by the focusing lens after passing through the focusing lens, and the detected sample is located at the focal plane; the reflection echo carrying the interfaces of the sample is converged by the focusing lens and is incident on the thin film beam splitter again, is reflected to the reflector through the thin film beam splitter, is converged to the terahertz receiving antenna through the second collimating lens.

3. The handheld integrated terahertz detection sensor of claim 2, wherein, The terahertz light path module further comprises a terahertz wave absorber, the terahertz wave absorber is installed on the fixed tool module and located below the thin film beam splitter; the terahertz wave beam emitted by the terahertz emission antenna is obliquely incident on the thin film beam splitter, and after passing through the thin film beam splitter, part of the terahertz wave is transmitted to the focusing lens and the other part of the terahertz wave is reflected to the terahertz wave absorber.

4. The handheld integrated terahertz detection sensor of claim 2, wherein, The incident terahertz wave of the terahertz emission antenna is incident on the thin film beam splitter at an angle of 45 degrees.

5. The handheld integrated terahertz detection sensor of claim 2, wherein, The focusing lens is installed on a focusing lens lens barrel through a compression ring, and the focusing lens lens barrel is installed on the front surface of the front end of the handheld shell.

6. The handheld integrated terahertz detection sensor of claim 2, wherein, The fixed tool module comprises a comprehensive installation base, a beam splitter installation base and an installation plate; the comprehensive installation base and the beam splitter installation base are respectively fixed on the installation plate, and the beam splitter installation base is located at the front end of the comprehensive installation base. The integrated installation base is a shell structure, front of which is provided with a receiving antenna positioning hole and a transmitting antenna positioning hole respectively, and the receiving antenna positioning hole is located above the transmitting antenna positioning hole, the terahertz transmitting antenna is installed on the integrated installation base through the transmitting antenna positioning hole, the first collimating lens is fixed at the opening of the receiving antenna positioning hole, the terahertz receiving antenna is installed on the integrated installation base through the receiving antenna positioning hole, and the second collimating lens is fixed at the opening of the receiving antenna positioning hole; the beam splitter installation base is a shell structure, a front surface of the beam splitter installation base is provided with a beam splitter limiting groove, and the thin film beam splitter is fixed in the beam splitter limiting groove.

7. The handheld integrated terahertz detection sensor of claim 1, wherein, The handheld shell comprises a right shell and a left shell, and the right shell and the left shell are fixed by screws.

8. The handheld integrated terahertz detection sensor of claim 7, wherein, The right shell and the left shell are provided with a silica gel sealing ring at the joint.

9. The handheld integrated terahertz detection sensor of claim 7, wherein, The handheld shell is also provided with a display screen, which is fixed between the right shell and the left shell and located at the rear end surface of the handheld shell.

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