TWI353584B - Acoustic device - Google Patents

Description

1353584 IX. Description of the Invention: [Technical Field] The present invention relates to a sound emitting device, and more particularly to a sound generating device based on a carbon nanotube. [Prior Art] The upper sounding device is generally composed of a signal input device and a sounding element. The electric signal is input to the sounding element through the # input device, and then the sound is emitted. The sounding element of the prior art is typically a speaker. The speaker is an electroacoustic device that converts an electric nickname into a sound signal. Specifically, the speaker can convert the audio electric power signal within the range of -^ into a audible sound having a small distortion and having a sufficient sound pressure level. There are many types of speakers. Although they work in different ways, they generally push the surrounding air by generating mechanical vibrations to cause fluctuations in the air medium to achieve "electricity, force, and sound." See Figure 1 The previous electric speaker 1〇〇 usually consists of three parts: the voice coil 102, the magnet 104, and the diaphragm 1〇6. The voice coil 1〇2 passes ^: with a conductor, when the audio input is followed by an audio current signal , the ring m is equivalent to a current-carrying conductor. If it is placed in a fixed magnetic field, according to the current-carrying conductor in the magnetic field will be subjected to Lorentz force, the voice coil 22 to a size is proportional to the 曰 frequency current, The force m〇2 whose direction changes with the audio current = will produce under the action of the magnetic field and drive the diaphragm to vibrate, and the vibration of the diaphragm _ before and after the vibration will convert the electrical signal into sound waves to the periphery. Light shot. In the autumn, the structure of the electric speaker is more complicated' and it must work under the condition of magnetic: 1353584. In the advanced way, the principle of the sounding of the sounding device of the prior art is the principle of the conversion of the sound and the sound, that is, the sounding, and the second input. In the extreme environment, "electricity d: the sound of the electrical signal is sounded." When "., ^下下' can not apply the above vocalization, if! refers to the phenomenon that the substance is subjected to periodic intensity modulation of light (5) sshengshengsheng. When the substance is exposed to light, it is excited by light energy: and the suction part :: becomes hot by non-radiation. If the illuminating beam undergoes periodic intensity changes in the material, causing periodic changes in the material and the near medium, causing periodic changes in stress (or pressure), thus producing an acoustic signal, This type of signal is called a photoacoustic signal. The frequency of the photoacoustic # is the same as the frequency of the optical modulation, and its intensity and phase are determined by the optical, thermal, elastic and geometric properties of the material. At present, photoacoustic spectroscopy and photoacoustic microscopy using photoacoustic effects have been widely used; they are used in the field of material composition analysis and detection. For example, the prior art photoacoustic spectrometer includes a light source, a sample chamber, and a signal detector. The source is typically a modulated pulsed laser source or a continuous source of laser light. The signal detector is typically a microphone. The sample to be tested is placed in the sample chamber, and the sample material is not limited and may be a gas, a liquid or a solid material such as a solid powder or a biological sample. The laser source emits a laser to the sample of the sample chamber t. Since the sound energy generated by the photoacoustic effect is directly proportional to the light energy absorbed by the substance, the substances of different compositions have absorption peaks at different wavelengths of the light wave, so When a source having a multi-spectral or continuous spectrum sequentially illuminates a sample with a beam of the same wavelength of 1353584, substances of different compositions within the sample will produce photoacoustic signal maxima at the wavelength of the light wave corresponding to the respective absorption peak. The signal detector determines the material type of the sample to be tested by detecting the maximum value of the photoacoustic signal. ^ However, the general material is limited by the light absorbing ability, and the generated photoacoustic signal intensity is weak' and the frequency range is above megahertz and can only be received by a transducer such as a microphone or a piezoelectric sensor. & The sound signal produced by the photoacoustic effect causes the sound signal generated by the sound to be directly perceived by the human ear. Further, in the prior art, there is no sound generating device which is manufactured by applying a photoacoustic effect to a generalized electromagnetic wave. Since the early 1990s, nanomaterials represented by carbon nanotubes (see microtubules of graphitic carbon, Nature, Sumio Iijima, v〇l 354, P56 (1991)) have been caused by their unique structure and properties. People are greatly concerned. In recent years, with the deepening of research on nano-barriers and nanomaterials, its broad application prospects have been continuously revealed. For example, due to the unique electromagnetic properties of carbon nanotubes, =. Mechanics, chemistry and other properties, a large number of applications related to its field emission electron source, name, new optical materials, soft ferromagnetic materials, etc. ::: reported:. However, in the prior art, no carbon nanotubes have been found as a sounding 70 for the field of acoustics. In view of the above, the present invention provides a sound emitting device that can directly emit a sound that can be perceived by the human ear under the non-magnetic and power-saving = [Abstract] 1353584 A sounding device including an electromagnetic wave signal input device And a sounding component. The sound emitting element is spaced apart from the electromagnetic wave signal input device. Wherein the sounding element comprises a carbon nanotube structure, and the electromagnetic wave signal input device transmits an electromagnetic wave signal to the carbon nanotube structure, so that the carbon nanotube structure generates heat by absorbing the electromagnetic wave signal, thereby heating the gas medium to emit Sound waves. Compared with the prior art, the sounding device has the following advantages: First, since the sounding element in the sounding device is composed only of a carbon nanotube structure, and no other complicated structure such as a magnet is needed, the structure of the sounding device is relatively Simple 'helps reduce the cost of the sounding device. Secondly, the sounding device uses the input k number to cause the temperature change of the carbon nanotube structure, so that the surrounding gas medium rapidly expands and contracts, and then emits sound waves, so the sound generating device composed of the carbon nanotube structure can be Working under magnetic conditions. Third, since the carbon carbon structure has a small heat capacity and a large specific surface area, the nano carbon structure has a rapid temperature rise, a small thermal hysteresis, and a fast heat exchange rate. The sounding device composed of the official structure can emit sound in a wide spectral range (1 Hz_1 GGkHz) and has a good sounding effect. Fourth, because the carbon nanotubes have good mechanical strength and toughness, the carbon nanotube structure composed of carbon nanotubes has good mechanical strength and toughness and durability, which is favorable for the preparation of carbon nanotubes. A variety of open/small-sized sounding devices of structural composition are conveniently used in various fields. Embodiments of the present invention will be described in detail with reference to the accompanying drawings. Referring to FIG. 2, a first embodiment of the present invention provides a sounding device 10' that includes an electromagnetic wave signal input device 112. A sounding piece 114' a support structure 116 and a modulation device 118. The sounding element 114s is again placed on the support structure. The electromagnetic wave signal input device 112 corresponds to the sounding element 114 and is spaced apart. The modulation device ι 8 is disposed between the electromagnetic wave signal input device 112 and the sounding element 114. The electromagnetic wave signal 12 发出 emitted from the electromagnetic wave signal input device 112 is modulated by the modulation device 118 to the intensity and frequency, and then transmitted to the surface of the sounding element 114. The sounding element 114 includes a carbon nanotube structure. The carbon nanotube structure y is a self-supporting carbon nanotube structure or a non-self-supporting carbon nanotube structure. The carbon nanotube structure is layered or otherwise shaped and has a specific surface area of t. The carbon nanotube structure includes a uniformly distributed carbon nanotube. The carbon nanotubes in the carbon nanotube structure are disordered or ordered.

In the second place, the carbon nanotube structure comprises a carbon nanotube film, a plurality of nanocarbon & long-line structures or any combination thereof. The carbon nanotubes are thin, 2, membrane or disordered carbon nanotubes. The nano-carbon tube long-line structure consists of a beam-like structure composed of a bundle of nano carbon nanotubes connected to each other or a material structure composed of a plurality of first = nanometer bundles (four). The twisting process of the long-length structure of the carbon nanotubes of the carbon nanotubes is obtained by a long-line structure in which the long-line structures can be arranged in parallel or in a mutually structured structure. In addition, the nano carbon two: the above-mentioned carbon nanotube film and the nano carbon tube long-line structure combination ~, the body, the nano carbon tube long line can be parallel or cross-serving 1353584 in the nano carbon The surface of the tube film serves as a support for enhancing the linearity of the carbon nanotube structure without reducing the specific surface area of the carbon nanotube structure. The carbon nanotube structure has a thickness of 0.5 nm to 1 mm. The carbon nanotubes in the carbon nanotube structure include one or more of a single-walled carbon nanotube, a double-walled carbon nanotube, and a multi-walled carbon nanotube. The single-walled carbon nanotube has a diameter of 0.5 nm to 50 nm, and the double-walled carbon nanotube has a diameter of 1 nm to 50 nm, and the diameter of the multi-walled carbon nanotube For 1 5 nm ~% nano. In short, the specific structure of the carbon nanotube structure is not limited, and only needs to satisfy the following two conditions: the carbon nanotube structure has a large specific surface area; includes a uniformly distributed carbon nanotube; and the thickness is 〇 5 nm ~ 1 mm. Since the carbon nanotube structure has a large specific surface area, when the carbon nanotube structure absorbs energy of light energy or other forms of electromagnetic waves to generate heat, it can quickly exchange heat with the surrounding gaseous medium, thereby making the surrounding The air heats up, causing the air to expand and contract and make a sound. In addition, since the #nano carbon nanotube structure has a large specific surface area, the carbon nanotube structure itself has good adhesion under the action of van der Waals force, so the carbon nanotube structure is used for sounding. When the component 114 is in use, the sounding component 114 can be directly adhered to the support structure 116. In addition, the sounding element can also be coupled to the support structure 116 by an adhesive. The binder may be a high temperature resistant stone. ... Since the carbon nanotube structure includes a carbon nanotube having a uniform hook distribution, the carbon nanotube structure can uniformly heat the air to emit sound, so that the sound emitting element 114 has a uniform sounding effect. 11 (S ) 1353584 * p Since the carbon nanotube structure should have a large specific surface area, the thickness of the carbon-weighted structure should not be too thick, too thick to affect the surrounding of the carbon nanotube disk. Heat exchange. In addition, the thickness of the carbon nanotube structure cannot be too thin, and if the thickness is too thin, the structural strength of the carbon nanotube is more susceptible to damage during the vocal process. It can be understood that when the thickness of the carbon tube structure is relatively small, For example, if the carbon nanotube structure has a high transparency, the sound emitting element 114 of the carbon nanotube structure is used for the transparent sounding element. In this case, the sounding element m can be directly disposed in various types. Displaying the display surface of the farm display, the display screen of the mobile phone or the surface of the oil raft to achieve the purpose of saving space. The support structure 116 mainly serves as a support, and its shape is not limited, any object having a certain shape, such as a wall or a table top, The support structure 116 can be a planar or curved structure and has a surface. In this case, the sounding element 114 is directly disposed and attached to the support structure 116. The surface of the support structure 116 is appealed. Since the sounding element 114 is entirely supported by the support structure 116, the sounding element 114 can withstand high-intensity electromagnetic wave signals 12 〇 input, so as to have a higher vocal intensity. In addition, the support structure 116 can also be a frame structure, a rod-like structure or an irregular shape structure. At this time, the sound-emitting element 114 is partially in contact with the support structure 116, and the rest Partially suspended setting. This arrangement allows for better heat exchange between the sounding element 114 and the air or surrounding medium. The sounding element 114 has a larger contact area with air or surrounding medium 'faster heat exchange rate' and therefore better Sound efficiency.

12 The material of the support structure 116 is not limited and may be a hard material such as stone, wood material 'glass or quartz. Additionally, the support structure can be a flexible material such as paper material, plastic or resin. Preferably, the material of the support structure 116 should have better thermal insulation properties, so that the heat generated by the k sounding element 114 is prevented from being excessively absorbed by the support structure, and the purpose of heating the air is not achieved. Further, the support structure ι 6 preferably has a relatively rough surface so that the sound-emitting element 114 provided on the surface of the support structure 116 can have a larger contact area with air or other external medium. It can be understood that since the carbon nanotube structure in the sound generating element 114 is a self-supporting structure, the support structure 116 is an optional structure. The electromagnetic wave signal input device 112 includes an electromagnetic wave signal source that emits an electromagnetic wave of variable intensity or frequency to form an electromagnetic wave signal 120. The intensity or frequency of the electromagnetic wave signal 12〇 can be constantly changed, so that the carbon nanotube structure as the sounding element 114 can absorb the electromagnetic wave signal 120 to intermittently heat the air, and the air is continuously expanded and contracted to continuously emit sound. The frequency range of the electromagnetic wave signal 12 包 includes radio waves, infrared rays, visible rays, ultraviolet rays, microwaves, X rays, and gamma rays. Preferably, the electromagnetic wave signal source is an optical signal source, and the emitted electromagnetic wave signal 120 can be an optical signal, and the wavelength of the optical signal includes various light waves from ultraviolet to far infrared wavelengths. The electromagnetic wave signal 12 has an average power density in the range of 1 y w/mm 2 to 20 W/mm 2 . It can be understood that the intensity of the electromagnetic wave signal 120 cannot be too weak, and if it is too weak, the carbon nanotube structure cannot sufficiently heat the surrounding air to emit sound, and the intensity of the electromagnetic wave signal 13 1353584 .120 cannot be too strong, so that the nanometer is too strong. The carbon tube structure reacts with oxygen in the air to destroy the carbon nanotube structure. Preferably, the electromagnetic wave signal source is a pulsed laser generator. The incident angle and position of the electromagnetic wave signal 120 emitted from the electromagnetic wave signal input device 112 on the sound emitting element 114 are not limited. Further, the distance between the electromagnetic wave signal input device 112 and the sound emitting element 114 is not limited, but it should be ensured that electromagnetic waves emitted from the electromagnetic wave signal input device 112 can be transmitted to the surface of the sound emitting element 114. Preferably, when the electromagnetic wave signal is an optical signal, and the electromagnetic wave signal input device 112 is far away from the sound emitting element 114, the electromagnetic wave signal input device 112 may further include an optical fiber, one end of the optical fiber and the optical signal. The source is connected, and the other end extends to the vicinity of the carbon nanotube film, so that the electromagnetic wave signal 120 emitted by the above-mentioned laser generator is transmitted to the surface of the sound emitting element 114 through the optical fiber. The modulating device 118 is an optional structure disposed on the transmission path of the electromagnetic wave signal 120, including a combination of an intensity modulator, a frequency modulator, or a dual. The sounding device 1A modulates the intensity and frequency of the electromagnetic wave #120 by the modulation device 118, thereby realizing the change in the intensity and frequency of the sound emitted by the sounding element. Specifically, the intensity of the electromagnetic wave signal 120 can be modulated by switching the electromagnetic wave signal 120 at a different frequency, or the intensity of the electromagnetic wave signal 120 can be modulated by varying the intensity of the electromagnetic wave signal 12〇 at a different frequency. The change in the intensity of the electromagnetic wave signal 12 affects the change in the sounding frequency of the 7G piece 114. By modulating the electromagnetic wave signal 12A, the sound producing element 114 can be made to emit sound of different frequencies. It can be understood that the modulating device 118 can be integrated or spaced apart from the electromagnetic wave signal input device 112 14 (S ) 1353584 . When the electromagnetic wave signal wheeling device 112 includes an optical fiber, the modulation device 118 can be disposed at the beginning or end of the optical fiber. In this embodiment, the modulation device 118 is an electro-optic crystal. In the sounding device of the embodiment of the present invention, a carbon nanotube structure is used as the sounding element, and since the absorption of the electromagnetic wave by the carbon nanotube is close to the absolute black body, the sounding device has a uniform absorption for the electromagnetic waves of various wavelengths. The carbon nanotube has a small heat capacity and a large heat dissipation area. In the case where the carbon nanotubes in the acoustic generating element 114 are irradiated by electromagnetic waves such as lasers, the carbon nanotubes are excited by the absorption of light energy, and the absorbed light energy is completely or partially converted into heat by non-radiation. . The carbon nanotubes rapidly rise in temperature and undergo rapid heat exchange with the surrounding air or other medium. If the irradiated electromagnetic wave is periodically intensity modulated, a periodic temperature change is generated in the carbon nanotube, so that the surrounding gas medium also undergoes periodic temperature changes, causing rapid expansion and contraction of the surrounding air or other medium. , thus making a sound. Further, in this embodiment, the sounding φ 7L member 114 includes a carbon nanotube structure composed of a large number of carbon nanotubes, so that the frequency of the electromagnetic wave signal 12 发出 emitted by the electromagnetic wave signal input device 118 is appropriate 'and the sounding element When the surrounding medium is air, the sound emitted by the sounding element 114 can be directly perceived by the human ear. It will be understood that the sounding element 114 can emit ultrasonic waves when the frequency of the electromagnetic wave signal 120 is increased. Referring to FIG. 3', a second embodiment of the present invention provides a sounding device 20'. The sounding device 20 includes a signal input device 212, a sounding element 214, a support structure 216, and a modulation device 218. The support structure 216 is a frame structure, a rod-shaped structure or an irregular shape 15 1353584. The sounding element 214 is partially in contact with the support structure 216, and the remaining portion is suspended so that sound can be transmitted through the sounding element 214. The electromagnetic wave signal input device 212 is corresponding to and spaced apart from the sound emitting element 214. The modulation device 218 is disposed between the electromagnetic wave signal input device 212 and the sound emitting element 214. The sounding device 20 is substantially similar in structure to the sounding device 1A in the first embodiment, and is different from the sounding device 1A in the first embodiment in that the sounding device 20 further includes a sounding structure 222. The structure 222 is spaced apart from the side I of the sounding element 214 that is remote from the electromagnetic wave signal 22〇. The sound-sounding structure 222 is disposed apart from the sound-emitting element 214 such that the sound waves emitted by the sound-emitting element 214 are reflected by the sound-sounding structure 222, enhancing the sounding effect of the sound-emitting device 20. Depending on the size of the sounding element 214, the distance can be 1 cm~1. It can be understood that the sound structure 222 can be various structures having a large surface, such as a planar structure or a curved structure. In the implementation, the sound structure 222 is a flat plate. The sound transmitting structure #222 can be spaced from the sounding element 214 by a bracket. In addition, the sound absorbing structure 222 and the supporting structure 216 can also be an integrated whole body such as a cavity having a narrow opening, and the sounding element 214 is laid on the opening of the cavity to form a Helmholtz resonance. Cavity. The material of the sound-absorbing structure (2) is wood, plastic, metal or glass. < In the embodiment of the present invention, the sounding element emits sound in a frequency range of 2 Hz to H) 10,000 Hz. When the carbon nanotubes in the sounding element are not aligned, the carbon tubes are arranged in an order, and the thickness of the carbon nanotube structure is thin, the sound intensity can reach 70 dB sound pressure level _ hunger. When the carbon nanotube structure

When the thickness of 16 is increased by 3584, the vocal intensity can be further enhanced. In addition, the carbon nanotube structure in the embodiment of the present technology has better linearity and mechanical strength. The sound generating device can be conveniently fabricated into various shapes and sizes by using the carbon nanotube structure. Conveniently used in a variety of music equipment, such as audio, mobile phones, Cong, MP4, television, computers and other electronic fields and their sounding devices. In addition, since electromagnetic waves, especially lasers, can be transmitted over long distances in the true two, the sounding device can be used for long-distance signal transmission, such as transmitting sound signals over long distances in the form of electromagnetic waves. Progressively, since the sound emitting element can be sounded by electromagnetic wave irradiation, when the electromagnetic wave is infrared light, visible light, ultraviolet microwave, ray line, and ray, the sound generating element can operate in an extreme environment of no electricity or magnetism. The sounding device provided by the embodiment of the present technical solution has the following advantages: since the sound emitting element in the sounding device only requires no complicated structure such as a magnet by the carbon nanotube structure group f, the structure of the sounding device is relatively simple and simple. It is beneficial to reduce the cost of the sounding device. Second, since the sounding element composed of the nano stone back tube structure can be audible through the input: the sound generating element can operate in an electroless environment. The sound generating device uses the input signal to cause the temperature change of the carbon nanotube structure, thereby rapidly expanding and contracting the surrounding gas medium, thereby generating sound waves, so that the sound generating device composed of the carbon tube structure can be in a non-magnetic condition. Work under. The fourth 'because of the carbon nanotube structure has a small heat capacity and a large specific surface area ii: the non-meterite reverse structure has the characteristics of rapid temperature rise, small thermal hysteresis, and fast exchange rate of cesium, so the nanometer The carbon tube structure consists of a sounding device ΐ 17 (S ) 1353584 to emit sound in a wide spectral range, good soot, 叼耷曰 Π 叼耷曰 叼耷曰 d - l - , , , , , , , , , , , , , , , , , , The carbon nanotubes have better mechanical strength = two carbon nanotube structures composed of carbon nanotubes have better mechanical properties, which facilitates the preparation of various shapes and sizes of sounding I composed of carbon nanotubes j. Conveniently used in a variety of fields. Sixth, when the thickness of the carbon nanotube structure is relatively small, for example, less than 1G micron, the carbon nanotube structure has high transparency, so

The sound emitting element of the carbon nanotube structure is a transparent sounding element, which can be directly disposed on the upper surface of the display device or the oil raft to achieve space saving. The sound generating device can further include The sound structure, the moving structure can reflect the sound waves emitted by the sounding element, and the sounding effect of the sounding device is reluctant. a In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application in this case. Equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention are intended to be included in the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic structural view of a speaker in the prior art. Fig. 2 is a schematic view showing the structure of a sound generating device of a first embodiment of the present technical solution. Figure 3 is a schematic structural view of a sounding device according to a second embodiment of the present technical solution. Figure 0 [Description of main component symbols]

(S 18 1353584 Speaker voice coil magnet diaphragm sounding device electromagnetic wave signal input device sounding element support structure • Modulation device electromagnetic wave signal sound structure 100 102 104 106 10, 20 112, 212 114, 214 116, 216 118, 218 120, 220 222

19

Claims (1)

1353584 X. Patent application scope 1. A sounding device comprising: an electromagnetic wave signal input device; and a sounding element 'the sounding element corresponding to the electromagnetic wave signal input device and spaced apart, the improvement is that the sounding element comprises a The carbon nanotube structure, the electromagnetic wave k input device transmits an electromagnetic wave signal to the carbon nanotube structure, so that the carbon nanotube structure generates heat by absorbing the electromagnetic wave signal, thereby heating the gas medium to emit sound waves. 2. The sounding device of claim 2, wherein the carbon nanotube structure is a layered structure. 3. The sounding device of claim 2, wherein the structure comprises a composite structure of a carbon nanotube film, a plurality of carbon nanotube long wires, or any combination thereof. Wherein, the thickness of the carbon nanotube structure of the sounding device as described in claim i is 0.5 nm to i mm, wherein the field is as described in claim 1 The carbon nanotube structure includes a uniformly distributed carbon nanotube. Iil 6. If the patent application scope flute is too far from the first sounding device, 7 V Shen: the carbon nanotubes are disordered or orderedly arranged in the nano-carboniferous structure of the sounding device 'where '❹ Carbon nanotubes and multi-walled carbon nanotubes, single-walled carbon nanotubes, double-walled: The diameter of the carbon nanotubes is 〇5, one or more, and the diameter of the single-walled ^ is nanometer, too, and nanometer. 'The double-walled nanocarbon', Ding, Mu's multi-walled carbon nanotubes have a straightness of 20 9 to 1.5 nm to 50 nm. = The application of the sound device step-by-step includes a support device, wherein the hair support structure is fixedly set. The sound-emitting element is a planar or curved surface of the support structure according to the eighth aspect of the patent application, wherein the cigarette---------------------- The surface Π is placed on the surface of the support structure as claimed. • The support structure is a frame structure in which the n L acoustic member is partially suspended by the support structure. The sounding device step-by-step includes the ιΛΙ hairpin set, wherein the sounding element is away from the electromagnetic wave ": the sounding structure is arranged to set the sounding element relative to the interval setting device The sounding device according to the above aspect, wherein the material of the support structure is a hard material or a flexible material. The material supported by the structure of the eighth item of the Shenqing patent scope is diamond. The glass horn is made of wood material or paper material, the surface stone, the plastic, the resin, the sounding device, wherein the _J step 匕 搋曰 structure, the sound structure comprises a Huo (four) vibration chamber, the sounding The sound generating device according to the first aspect of the invention, wherein the skin (four) is radio waves, infrared rays, visible light, ultraviolet rays, 21 1353584 One or more of microwave, X-ray and gamma rays. 16. The sounding device of claim 1, wherein the electromagnetic wave signal input device further comprises an optical signal source, and the electromagnetic wave signal input device emits an optical signal through the optical signal source, the light k The wavelength of the number is between the ultraviolet region and the far infrared region. 17. The sounding device of claim 16, wherein the optical signal source is a gland laser generator. 18. The sounding device of claim 16, wherein the electromagnetic wave signal input device further comprises an optical fiber, one end of the optical fiber is connected to the light source k, and the other end is extended to the carbon nanotube Near the film, the optical signal is transmitted through the optical fiber to the carbon nanotube structure. 19. The sounding device of claim 4, wherein the sounding device further comprises a modulation device disposed between the electromagnetic wave signal input device and the sounding element and located at the electromagnetic wave The modulation means includes a strength adjustment device, a frequency modulation device, or a combination of both on the transmission path of the signal. The sounding device according to the first aspect of the invention, wherein the electromagnetic wave signal has an average power density of 胄1/zW/mm2 to 2〇w/mm2. twenty two