A raman spectroscopy detection device and a portable apparatus

Abstract

The embodiment of the application discloses a Raman spectrum detection device and a portable device, the Raman spectrum detection device comprises a substrate, a laser emission module, a laser receiving module and a signal processing module, the laser emission module and the laser receiving module are installed on the substrate, after the laser emission unit in the laser emission module emits a laser signal, the laser emission module filters the laser signal to obtain a target laser signal, and the target laser signal is focused to a target direction. The laser receiving module receives the reflected light signal generated after the target laser signal irradiated to an object occurs diffuse reflection, and collimates and filters the emitted light signal to convert into an electric signal, and the signal processing module performs Raman detection on the electric signal. The embodiment can reduce the volume of the Raman spectrum detection device, realize the miniaturization of the Raman spectrum detection device, and solve the technical problem that the Raman spectrum detection device in the prior art is difficult to miniaturize.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the field of optical detection, in particular to a Raman spectrum detection device and a portable device. BACKGROUND

[0002] The Raman spectrum is a kind of molecular vibration and rotation energy level transition spectrum, the Raman spectrum can reflect the molecular structure of a substance, and the intensity of the Raman spectrum has a linear relationship with the content of the substance, so that the content of the related substance in the sample to be detected can be conveniently and accurately detected, therefore the Raman spectrum is widely applied in substance detection, and has the advantages of fast detection speed, no damage to the sample, and simple sample preparation of the sample to be detected.

[0003] However, in the process of detecting the substance by using the Raman spectrum, the performance requirement of the complete Raman spectrum detection device is relatively high, so that the Raman spectrum detection device is difficult to be miniaturized, especially in the wearable device, the integration difficulty coefficient is larger.

[0004] In summary, the Raman spectrum detection device in the prior art has the technical problem of being difficult to be miniaturized. SUMMARY

[0005] The embodiment of the present application provides a Raman spectrum detection device and a portable device, which can miniaturize the Raman spectrum detection device, and solves the technical problem that the Raman spectrum detection device in the prior art is difficult to be miniaturized.

[0006] In a first aspect, the embodiment of the present application provides a Raman spectrum detection device, which comprises a substrate, a laser emission module, a laser receiving module and a signal processing module.

[0007] The substrate is used for fixing the laser emission module and the laser receiving module.

[0008] The laser emission module comprises at least one laser emission unit, the laser emission unit is used for emitting a laser signal, and the laser emission module is used for focusing the target laser signal obtained by filtering the laser signal to a target direction;

[0009] The laser receiving module comprises a photosensitive unit, the photosensitive unit is arranged on the substrate, the laser receiving module is used for receiving a reflected light signal, and the target reflected light signal is obtained by collimating and filtering the reflected light signal, and then the target reflected light signal is emitted to the photosensitive unit, so that the photosensitive unit converts the target reflected light signal into an electric signal; the photosensitive unit comprises but is not limited to any one of a photodiode, a single-photon avalanche diode and an avalanche photodiode; the reflected light signal is generated by the target laser signal irradiating to an object and then being diffusely reflected;

[0010] The signal processing module is connected to the photosensitive unit, and the signal processing module is used to perform Raman spectroscopy detection on the electrical signal.

[0011] Secondly, embodiments of the present invention provide a portable device, including the Raman spectroscopy detection device described above.

[0012] The present invention provides a Raman spectroscopy detection device and a portable device. The Raman spectroscopy detection device includes a substrate, a laser emitting module, a laser receiving module, and a signal processing module. The laser emitting module and the laser receiving module are mounted on the substrate. After emitting a laser signal, the laser emitting unit in the laser emitting module filters the laser signal to obtain the target laser signal and focuses the target laser signal onto the target direction. The laser receiving module receives the reflected light signal generated after the target laser signal irradiates the object and undergoes diffuse reflection. It then collimates and filters the emitted light signal and converts it into an electrical signal. The signal processing module performs Raman detection on the electrical signal. The photosensitive unit in this embodiment includes, but is not limited to, any one of a photodiode, a single-photon avalanche diode, and avalanche photodiode. Since photodiodes, single-photon avalanche diodes, and avalanche photodiodes are very small, the size of the Raman spectroscopy detection device can be reduced as much as possible, achieving miniaturization of the Raman spectroscopy detection device. This solves the technical problem of difficulty in miniaturizing existing Raman spectroscopy detection devices. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a Raman spectroscopy detection device provided in an embodiment of the present invention.

[0014] Figure 2 This is a schematic diagram of another Raman spectroscopy detection device provided in an embodiment of the present invention.

[0015] Figure 3 This is a schematic diagram of another Raman spectroscopy detection device provided in an embodiment of the present invention.

[0016] Figure 4 This is a schematic diagram of the structure of a pad provided in an embodiment of the present invention.

[0017] Figure 5 This is a schematic diagram of a Raman spectroscopy detection device for detecting substance concentration, provided as an embodiment of the invention.

[0018] Reference numerals: 1. Substrate; 2. Laser emitting module; 3. Laser receiving module; 4. Laser emitting unit; 41. First laser emitting unit; 42. Second laser emitting unit; 5. Photosensitive unit; 6. Pad; 7. Narrow bandpass filter; 8. Focusing lens; 9. Collimating lens; 10. Notch filter; 11. Narrow bandwidth filter. Detailed Implementation

[0019] The following description and accompanying drawings fully illustrate specific embodiments of this application to enable those skilled in the art to practice them. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The scope of embodiments of this application includes the entire scope of the claims and all available equivalents of the claims. In this document, each embodiment may be referred to individually or collectively by the term "invention," which is merely for convenience and is not intended to automatically limit the scope of the application to any single invention or inventive concept if more than one invention is disclosed. Relational terms such as "first" and "second" are used herein only to distinguish one entity or operation from another, without requiring or implying any actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed. The various embodiments in this document are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the structures, products, etc., disclosed in the embodiments, since they correspond to the disclosed parts, the descriptions are relatively simple; relevant details can be found in the method section.

[0020] Currently, Raman spectroscopy detection equipment operates on the principle of Raman scattering. When a laser beam strikes a target, Raman shift occurs, generating a specific Raman signal. The equipment analyzes this signal to perform Raman spectroscopy detection. However, the probability of Raman scattering is very low, resulting in a weak Raman signal. Furthermore, during the detection of biological samples, the laser produces a strong fluorescence effect alongside Raman scattering. The fluorescence intensity is more than 1000 times stronger than the Raman signal, often causing the Raman signal to be submerged within the fluorescence signal. For these reasons, detecting Raman signals requires high performance from Raman spectroscopy equipment, making miniaturization difficult.

[0021] In summary, to address the technical problem of miniaturizing Raman spectroscopy detection equipment in existing technologies, embodiments of the present invention provide a Raman spectroscopy detection device, such as... Figure 1 As shown, Figure 1A structural schematic diagram of a Raman spectrum detection device provided by the embodiment of the present application, the Raman spectrum detection device provided by the embodiment of the present application comprises a substrate 1, a laser emission module 2, a laser receiving module 3 and a signal processing module.

[0022] The substrate 1 is used for fixing the laser emission module 2 and the laser receiving module 3.

[0023] In the embodiment, the Raman spectrum detection device comprises the substrate 1, wherein the substrate 1 is used for fixing the laser emission module 2 and the laser receiving module 3, and the fixing manner of the substrate 1 to the laser emission module 2 and the laser receiving module 3 can be set according to actual needs, for example, the laser emission module 2 and the laser receiving module 3 can be pasted on the substrate 1 or fixed on the substrate 1 by screws, and the fixing manner is not limited in the embodiment of the present application.

[0024] The laser emission module 2 comprises at least one laser emission unit 4, the laser emission unit 4 is used for emitting a laser signal, and the laser emission module 2 is used for filtering the laser signal to obtain a target laser signal and focusing the target laser signal to a target direction.

[0025] In the embodiment, the laser emission module 2 comprises at least one laser emission unit 4, wherein the laser emission unit 4 is used for emitting a laser signal, and the type of the laser emission unit 4 can be selected according to actual needs in an embodiment, for example, the laser emission unit 4 can be a VCSEL (Vertical Cavity Surface Emitting Laser, vertical cavity surface emitting laser) or the like, and the type of the laser emission unit 4 is not limited in the embodiment. After the laser emission unit 4 emits the laser signal, the laser emission module 2 is further used for filtering the laser signal to obtain a target laser signal. For example, a filter can be arranged in the laser emission module 2 to filter the laser signal by the filter to obtain the target laser signal. After obtaining the target laser signal, the laser emission module 2 further focuses the target laser signal to a target direction. For example, a focusing lens can be arranged in the laser emission module 2 to focus the target laser signal to the target direction by the focusing lens.

[0026] The laser receiving module 3 comprises a photosensitive unit 5 arranged on the substrate 1, and the laser receiving module 3 is used for receiving a reflected light signal, collimating and filtering the reflected light signal to obtain a target reflected light signal, and emitting the target reflected light signal to the photosensitive unit 5, so that the photosensitive unit 5 converts the target reflected light signal into an electric signal. The photosensitive unit 5 comprises but is not limited to any one of a photodiode, a single-photon avalanche diode and an avalanche photodiode. The reflected light signal is generated by the target laser signal irradiating an object to occur diffuse reflection.

[0027] The Raman spectrum detection device further comprises a laser receiving module 3. When the target laser signal is focused to the target direction by the laser emitting module 2, the target laser signal irradiated to the object on the target direction will be diffusely reflected, thereby generating a reflected light signal. The laser receiving module 3 is used to receive the reflected light signal, and collimate and filter the reflected light signal to obtain a target reflected light signal. For example, a collimating lens and a filter sheet can be arranged in the laser receiving module 3. The collimating lens is used to collimate the reflected light signal. Generally, the light rays are divergent, that is, the two adjacent light rays will be farther and farther apart after propagation. Collimation means keeping the light rays parallel. The collimated reflected light signal is filtered by the filter lens, thereby obtaining the target reflected light signal.

[0028] In the embodiment, the laser receiving module 3 further comprises a photosensitive unit 5. The photosensitive unit 5 is used to convert the target reflected light signal into an electrical signal. In the embodiment, the photosensitive unit 5 includes, but is not limited to, any one of a photodiode, a single-photon avalanche diode and an avalanche photodiode. Since the volume of the photodiode, the single-photon avalanche diode and the avalanche photodiode is very small, the volume of the Raman spectrum detection device can be reduced as much as possible, thereby realizing the miniaturization of the Raman spectrum detection device.

[0029] The signal processing module is connected with the photosensitive unit 5. The signal processing module is used to perform Raman spectrum detection on the electrical signal.

[0030] The Raman spectrum detection device further comprises a signal processing module (not shown in the figure). The signal processing module is connected with the photosensitive unit 5. The signal processing module is used to obtain the electrical signal from the photosensitive unit 5 after the photosensitive unit 5 converts the target reflected light signal into the electrical signal, and perform Raman spectrum detection by analyzing the electrical signal. The process of performing Raman spectrum detection can refer to the prior art, which will not be described in detail in the embodiment.

[0031] The embodiment of the present application provides a Raman spectrum detection device, the Raman spectrum detection device includes a substrate, a laser emission module, a laser receiving module and a signal processing module, the laser emission module and the laser receiving module are installed on the substrate, the laser emission unit in the laser emission module is filtered to obtain target laser signals after emitting laser signals by the laser emission module, and the target laser signals are focused to a target direction.The laser receiving module receives the reflected light signals generated after the target laser signals are irradiated to the object and occur diffuse reflection, and the emitted light signals are collimated and filtered to be converted into electrical signals, and the electrical signals are subjected to Raman detection by the signal processing module.The photosensitive unit in the embodiment of the present application includes but is not limited to any one of a photodiode, a single-photon avalanche diode and an avalanche photodiode, and since the volume of the photodiode, the single-photon avalanche diode and the avalanche photodiode is very small, the volume of the Raman spectrum detection device can be reduced as much as possible, the miniaturization of the Raman spectrum detection device is realized, and the technical problem that the Raman spectrum detection device in the prior art is difficult to miniaturize is solved.

[0032] On the basis of the above-mentioned embodiment, the laser emission module 2 includes a first laser emission unit 41, and the laser emission module 2 further includes a pad 6, a narrow-band pass filter 7 and a focusing lens 8.

[0033] The pad 6 is arranged on the substrate 1, and the pad 6 includes a first mounting surface forming a first angle with the substrate 1, and the first laser emission unit 41 is arranged on the first mounting surface.

[0034] As shown in the figure, Figure 2 In the embodiment, the laser emission module 2 includes the pad 6, and the pad 6 is arranged on the substrate 1. The pad 6 includes a first mounting surface forming a first angle θ with the substrate 1, for example, the range of the first angle θ can be 0°≤ θ≤ 60°. In addition, the first laser emission unit 41 is arranged on the first mounting surface, and the first laser emission unit 41 is used for emitting laser signals to the narrow-band pass filter 7. In the embodiment, the laser signal can be an ultraviolet signal, a visible light signal or a near-infrared light signal, the wavelength of the laser signal is in the range of 300 nm to 1600 nm, the bandwidth is <10 nm, and the center wavelength is λ1.

[0035] The narrow-band pass filter 7 is parallel to the first mounting surface, and is used for filtering the laser signals to obtain target laser signals.

[0036] The laser emission module 2 further comprises a narrow-band pass filter 7 stacked by multiple layers of high and low refractive film layers, the narrow-band pass filter 7 is parallel to the first mounting surface, when the laser is incident on the narrow-band pass filter 7 with a central wavelength of λ1 at an angle β, the central wavelength of the narrow-band pass filter 7 will be blue-shifted to λφ. After the laser signal emitted by the first laser emission unit 41 reaches the narrow-band pass filter 7, the narrow-band pass filter 7 will filter the laser signal to obtain the target laser signal. In one embodiment, the central wavelength of the narrow-band pass filter 7 is the same as the central wavelength of the laser signal emitted by the first laser emission unit 41, and the bandwidth length of the narrow-band pass filter 7 is less than or equal to the preset bandwidth, that is, the central wavelength of the narrow-band pass filter 7 is also λ1, and the bandwidth length of the narrow-band pass filter 7 is less than or equal to 1 nm.

[0037] The focusing lens 8 is parallel to the narrow-band pass filter 7 and is used to focus the target laser signal to the target direction.

[0038] The focusing lens 8 in the laser emission module 2 is parallel to the narrow-band pass filter 7, and the focusing lens 8 is used to focus the target laser signal to the target direction. In one embodiment, considering the miniaturization of the Raman detection device, the focusing lens 8 includes but is not limited to any one of a Fresnel lens, a diffractive lens, or a superlens.

[0039] On the basis of the above embodiment, the laser emission module 2 further comprises a second laser emission unit 42, and the cushion block 6 further comprises a second mounting surface forming a second angle with the substrate 1, the second mounting surface is provided with the second laser emission unit 42, and the second angle is greater than the first angle, and the central wavelength of the laser signal of the first laser emission unit 41 is at least greater than or equal to a preset value of the central wavelength of the laser signal of the second laser emission unit 42.

[0040] In one embodiment, as shown in Figure 3 the laser emission module 2 further comprises a second laser emission unit 42, and the cushion block 6 further comprises a second mounting surface forming a second angle with the substrate 1, the second mounting surface is provided with the second laser emission unit 42, and the second angle is greater than the first angle, as shown in Figure 4 It should be noted that the angle between the mounting surface (including the first mounting surface and the second mounting surface) on the cushion block 6 and the substrate 1 will affect the central wavelength when the laser signal is irradiated to the narrow-band pass filter 7, when the first angle and the second angle are different, the central wavelength of the laser signal of the first laser emission unit 41 irradiated to the narrow-band pass filter 7 is different from the central wavelength of the laser signal of the second laser emission unit 42 irradiated to the narrow-band pass filter 7, that is, the wavelengths of the two target laser signals transmitted through the narrow-band pass filter 7 are also different, so as to facilitate subsequent Raman detection.

[0041] In order to ensure that the target laser signal obtained by the narrow bandpass filter 7 has different wavelengths, the center wavelength of the laser signal of the first laser emitting unit 41 is required to be at least greater than the center wavelength of the laser signal of the second laser emitting unit 42 by a preset value in the embodiment, for example, the preset value can be set to 2 nm. In one embodiment, the first angle θ is in the range of 0°≤θ≤60°, and the second angle is greater than the first angle by a preset angle φ, wherein the preset angle φ is determined by the center wavelength λ1 of the laser signal of the first laser emitting unit 41 and the center wavelength λ2 of the laser signal of the second laser emitting unit 42. Specifically, assuming that n0 is the refractive index of the incident surface of the laser signal, and the incident surface medium is air in general, in which case n0=1; n eff is the refractive index of the narrow band filter, and β is the incident angle of the laser signal, which is equal to the preset angle φ here. The center wavelength of the laser signal of the first laser emitting unit 41 is λ1, and the center wavelength of the laser signal of the second laser emitting unit 42 is λ2, which satisfy the following relationship:

[0042]

[0043] After the specific values of λ1 and λ2 are obtained, the preset angle φ between the second angle and the first angle can be determined, which is illustrated by the following examples:

[0044] Example 1: If λ1 is 785 nm and λ2 is 780 nm, the preset angle φ between the second angle and the first angle is 12°;

[0045] Example 2: If λ1 is 830 nm and λ2 is 827 nm, the preset angle φ between the second angle and the first angle is 9°;

[0046] Example 3: If λ1 is 1064 nm and λ2 is 1060 nm, the preset angle φ between the second angle and the first angle is 9°.

[0047] It can be understood that the Raman detection device provided in the embodiment can be pre-determined with the center wavelength λ1 of the laser signal of the first laser emitting unit 41 and the center wavelength λ2 of the laser signal of the second laser emitting unit 42 before leaving the factory, and the value of the preset angle φ can be determined according to λ1 and λ2. In another embodiment, a mechanical transmission device can be pre-set in the gasket, and the second angle between the second mounting surface and the substrate 1 can be changed by using the mechanical transmission device, so that the second angle can be adjusted according to the preset angle φ.

[0048] On the basis of the above-mentioned embodiments, the laser receiving module 3 further comprises a collimating lens 9, a notch filter 10, and a narrow bandwidth filter 11.

[0049] The collimating lens 9 is parallel to the substrate 1 and is used to collimate the reflected light signal so that the reflected light signal is parallel to the notch filter 10.

[0050] As shown in Figure 3 the embodiment, the laser receiving module 3 further comprises a collimating lens 9, and the collimating lens 9 is arranged parallel to the substrate 1. When the target laser signal irradiates the surface of the object to be detected in the target direction, the target laser signal will be reflected and scattered to generate a reflected light signal. The collimating lens 9 is used to collimate the reflected light signal so that the reflected light signal is parallel to the notch filter 10. In one embodiment, considering the miniaturization of the Raman detection device, the collimating lens 9 includes, but is not limited to, any one of a Fresnel lens, a diffractive lens, or a superlens.

[0051] The notch filter 10 is parallel to the substrate 1 and is used to filter out the reflected light and Rayleigh scattered light of the reflected light signal to obtain a filtered reflected light signal.

[0052] The laser receiving module 3 further comprises a notch filter 10, wherein the notch filter 10 is arranged parallel to the substrate 1. The notch filter refers to a filter that can rapidly attenuate an input signal at a certain frequency point to achieve a filtering effect of hindering the passage of signals at this frequency. The notch filter 10 belongs to a kind of band-stop filter. In the embodiment, the center wavelength of the notch filter 10 is the same as λ1, and the band-stop width of the notch filter 10 is 2*(1-2), which is used to filter out the reflected light and Rayleigh scattered light of the incident reflected light signal to obtain a filtered reflected light signal.

[0053] The narrow-bandwidth filter 11 is arranged on the side of the photosensitive unit 5 for receiving light signals and is parallel to the substrate 1, and is used to filter the filtered reflected light signal to obtain a target reflected light signal and transmit the target reflected light signal to the photosensitive unit 5.

[0054] The laser receiving module 3 further comprises a narrow-bandwidth filter 11, wherein the narrow-bandwidth filter 11 is arranged on the side of the photosensitive unit 5 for receiving light signals, and the narrow-bandwidth filter 11 is parallel to the substrate 1. After the reflected light signal obtains the filtered reflected light signal in the notch filter 10, the filtered reflected light signal is further filtered in the narrow-bandwidth filter 11 to obtain a target reflected light signal, and the target reflected light signal is further transmitted to the photosensitive unit 5. In one embodiment, the bandwidth of the photosensitive unit 5 is ≤1 nm.

[0055] On the basis of the above-mentioned embodiments, the laser receiving module 3 comprises at least one photosensitive unit 5, and the number of the narrow-bandwidth filters 11 is consistent with the number of the photosensitive units 5.

[0056] In one embodiment, the laser receiving module 3 includes at least one photosensitive unit 5. The number of photosensitive units 5 is affected by the number of characteristic peaks required by the analyte and the type of analyte to be measured. In this embodiment, the number of photosensitive units 5 is not specifically limited. In addition, the number of narrow-bandwidth filters 11 is the same as the number of photosensitive units 5, that is, each photosensitive unit 5 is provided with a narrow-bandwidth filter 11.

[0057] In one embodiment, when performing non-invasive hemoglobin concentration testing using the Raman detection device provided in this embodiment of the invention, the center wavelength λ1 of the first laser emitting unit 41 is 785nm, the bandwidth is ±5nm, and the laser signal power is 200mW; the center wavelength of the narrow bandpass filter 7 is 785nm, and the bandwidth is ±0.5nm; the target laser signal is at a 30-degree angle to the sample under test, i.e., θ is 30°, and the final spot diameter incident on the surface of the sample under test is 1mm. A 1549cm² laser beam is selected. -1 The peak is a characteristic peak of hemoglobin. The photosensitive element is a photodiode with a quantity of 1. The corresponding narrow bandwidth filter 11 has a center wavelength of 893.5nm and a bandwidth of 0.5nm.

[0058] In another embodiment, when using the Raman detection device provided in this invention to perform non-invasive blood glucose concentration testing, the center wavelength λ1 of the laser signal is 785 nm, the bandwidth is ±5 nm, and the power of the laser signal is 200 mW; the center wavelength of the narrow-bandpass filter 7 is 785 nm, and the bandwidth is ±0.5 nm; the target laser signal is at a 30-degree angle to the sample to be tested, i.e., θ is 30°, and the final diameter of the spot incident on the surface of the sample to be tested is 1 mm. Considering that there are multiple Raman frequency shift characteristic peaks of glucose, the peaks with the best correlation are selected as characteristic peaks, i.e., wavenumber 911 cm⁻¹. -1 1060cm -1 And 1125cm -1 Three peaks. Furthermore, substances such as fat in the skin and hemoglobin in the blood can affect the accuracy of the final result, thus increasing the peak by 1549 cm⁻¹. -1 Peaks are used to eliminate the influence of intravascular hemoglobin on the results. The photosensitive element is a photodiode, with a total of 4 photodiodes arranged in a 2*2 array. The center wavelengths of the four corresponding narrow bandwidth filters 11 are 845.5nm, 856.5nm, 861.0nm and 893.5nm, respectively, and the bandwidth of each is 0.5nm.

[0059] The working process of the Raman detection device is as follows: Figure 5 As shown, firstly, the first laser emitting unit 41 is turned on, and the photosensitive unit 5 receives the Raman signal. The signal processing module integrates the Raman signal for a period of time t1. Then, the first laser emitting unit 41 is turned off, and the signal processing module outputs the light intensity value detected by the photosensitive element at this time. After that, the second laser emitting unit 42 is turned on again, the Raman signal is received by the photosensitive unit 5, and the signal processing module performs integration for a period of time t2, and in general, t2=t1. After that, the signal processing module outputs the light intensity value detected by the photosensitive element at this time Suppose that λ1=785nm, λ2=780nm, and the Raman shift of glucose is 1125cm -1 , the first laser emitting unit 41 corresponds to a Raman peak wavelength of 861nm, and the center wavelength of the narrow-band filter 11 corresponding thereto is 861nm; the second laser emitting unit 42 corresponds to a Raman peak wavelength of 855nm, which is filtered out by the narrow-band filter 11, and only the fluorescence excited at 861nm is transmitted , and the subsequent processing process is similar to the above process. The difference between the light intensity values of the subsequent multiple time periods is calculated by repeating the above steps After that, the concentration of the corresponding substance can be calculated according to the difference, and the process is as shown in Figure 5 .

[0060] The above, the embodiment of the present application provides a kind of Raman spectrum detection device, the embodiment of the present application selects any one of photodiode, single-photon avalanche diode and avalanche photodiode as photosensitive element, selects any one of Fresnel lens, diffractive lens and superlens as focusing lens and collimating lens, to be able to reduce the volume of Raman spectrum detection device as far as possible, realize the miniaturization of Raman spectrum detection device, solve the technical problem that Raman spectrum detection equipment in prior art is difficult to be miniaturized. In addition, the first mounting surface and the second mounting surface with different angles with the substrate are arranged on the cushion block in the embodiment of the present application, so that the laser emitting device can emit target laser signals with different wavelengths for subsequent Raman detection.

[0061] The embodiment of the present application also provides a kind of portable equipment, including the Raman spectrum detection device described above. The Raman spectrum detection device includes a substrate, a laser emitting module, a laser receiving module and a signal processing module, the laser emitting module and the laser receiving module are installed on the substrate, the laser emitting unit in the laser emitting module filters the laser signal to obtain the target laser signal after emitting the laser signal, and focuses the target laser signal to the target direction. The laser receiving module receives the reflected light signal generated after the target laser signal irradiated to the object occurs diffuse reflection, and collimates and filters the emitted light signal to convert it into an electrical signal, and the signal processing module performs Raman detection on the electrical signal.

[0062] The photosensitive unit in the embodiment of the present application includes, but is not limited to, any one of a photodiode, a single photon avalanche diode and an avalanche photodiode. Since the photodiode, the single photon avalanche diode and the avalanche photodiode have a small volume, the volume of the Raman spectrum detection device can be reduced as much as possible, the miniaturization of the Raman spectrum detection device is realized, and the technical problem that the Raman spectrum detection device in the prior art is difficult to miniaturize is solved.

[0063] It should be noted that the above are only the preferred embodiments of the present application and the technical principles applied. Those skilled in the art will understand that the embodiments of the present application are not limited to the specific embodiments herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the protection scope of the embodiments of the present application. Therefore, although the embodiments of the present application have been described in more detail through the above embodiments, the embodiments of the present application are not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the embodiments of the present application, and the scope of the embodiments of the present application is determined by the scope of the appended claims.

Claims

1. A Raman spectroscopic detection device, characterized by, The application relates to a laser Raman spectrum detection device. The device comprises a substrate, a laser emission module, a laser receiving module and a signal processing module. The substrate is used for fixing the laser emission module and the laser receiving module. The laser emission module comprises at least one laser emission unit, which is used for emitting a laser signal. The laser emission module is used for filtering the laser signal to obtain a target laser signal and focusing the target laser signal to a target direction. The laser receiving module comprises a photosensitive unit arranged on the substrate. The laser receiving module is used for receiving a reflected light signal, collimating and filtering the reflected light signal to obtain a target reflected light signal, and emitting the target reflected light signal to the photosensitive unit. The photosensitive unit converts the target reflected light signal into an electric signal. The photosensitive unit comprises a photodiode. The reflected light signal is generated by the target laser signal irradiating an object and then being diffusely reflected. The signal processing module is connected with the photosensitive unit and is used for performing Raman spectrum detection on the electric signal.

2. The Raman spectroscopy detection device of claim 1, wherein, The laser emission module comprises a first laser emission unit.

3. The Raman spectroscopy detection device of claim 1, wherein, The first angle θ is in a range of The second angle is greater than the first angle by a predetermined angle.

4. The Raman spectroscopy detection device of claim 1, wherein, The laser emission module further comprises a cushion block, a narrow-band filter and a focusing lens.

5. The Raman spectroscopy detection device of claim 1, wherein, The cushion block is arranged on the substrate. The cushion block comprises a first mounting surface forming a first angle with the substrate. The notch filter is parallel to the substrate and is used to filter reflected light and Rayleigh scattered light of the reflected light signal to obtain a filtered reflected light signal; the central wavelength of the notch filter is the same as The first mounting surface is provided with the first laser emission unit. and the band rejection width is wherein, The narrow-band filter is parallel to the first mounting surface and is used for filtering the laser signal to obtain the target laser signal. is the central wavelength of the laser signal of the first laser emitting unit, The focusing lens is parallel to the narrow-band filter and is used for focusing the target laser signal to the target direction. is the central wavelength of the laser signal of the second laser emitting unit. The laser emission module further comprises a second laser emission unit.

6. The Raman spectroscopy detection device of claim 5, wherein, The cushion block further comprises a second mounting surface forming a second angle with the substrate. The second mounting surface is provided with the second laser emission unit. The second angle is greater than a preset angle of the first angle. The preset angle is determined by the center wavelength of the laser signal of the first laser emission unit and the center wavelength of the laser signal of the second laser emission unit. The center wavelength of the laser signal of the first laser emission unit is at least greater than the center wavelength of the laser signal of the second laser emission unit by a preset value. The center wavelength of the narrow-band filter is the same as the center wavelength of the laser signal emitted by the first laser emission unit. The bandwidth of the narrow-band filter is less than or equal to a preset bandwidth. The focusing lens comprises a diffractive lens. The laser receiving module further comprises a collimating lens, a trap filter and a narrow-band filter. The collimating lens is parallel to the substrate and is used for collimating the reflected light signal. The trap filter is parallel to the substrate and is used for filtering the reflected light signal. The narrow-band filter is arranged on a side of the photosensitive unit for receiving the light signal and is parallel to the substrate. The narrow-band filter is used for filtering the filtered reflected light signal to obtain the target reflected light signal and emitting the target reflected light signal to the photosensitive unit. The collimating lens comprises a diffractive lens.

7. The Raman spectroscopy detection device of claim 5, wherein, The laser receiving module comprises at least one light sensing unit, and the number of the narrow-band filters is consistent with the number of the light sensing units.

8. A portable device, characterized in that The Raman spectrum detection device comprises the Raman spectrum detection device according to any one of claims 1-7.

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