A laser ranging device and ranging method

Abstract

This invention discloses a laser ranging device and method, belonging to the field of distance detection technology. The laser ranging device includes a laser, a sensing device, a processor, and a display device; the laser emits light to the sensing device, the processor processes the optical information from the sensing device, and transmits it to the display device; the laser is a 980nm laser, and the sensing device is coated with NaYF4:Yb. 3+ Er 3+ @NaYF4 material photodiode chip. This invention utilizes NaYF4:Yb 3+ Er 3+ @NaYF4 material is encapsulated in a photodiode as an optical sensing device for distance detection, utilizing NaYF4:Yb 3+ Er 3+ Yb in NaYF4 material 3+ Er acts as a sensitizer to absorb laser light. 3+ As an activator, it emits tunable visible light, enabling the human eye to recognize and make a preliminary judgment of the target distance in real time. Furthermore, it can be based on NaYF4:Yb 3+ Er 3+ The spectral information generated by the @NaYF4 material provides accurate information about the target distance. Therefore, the laser ranging device possesses excellent detection accuracy and real-time response characteristics, enabling precise target identification and high-precision dynamic obstacle-penetrating ranging.

Description

Technical Field

[0001] This invention belongs to the field of distance detection technology, specifically relating to a laser ranging device and ranging method. Background Technology

[0002] Distance measurement has wide applications in many fields such as aviation, military, construction, and surveying. Especially in engineering surveying, distance measurement is a major task. Direct contact distance measurement has the advantage of simplicity. Currently, commonly used direct distance measurement methods include steel tape, measuring tape, and measuring rope. However, these methods have drawbacks such as high labor intensity, susceptibility to external contact effects, and low measurement efficiency. Therefore, non-contact indirect distance measurement methods, such as camera distance measurement, ultrasonic distance measurement, millimeter wave distance measurement, and laser distance measurement, are now widely used.

[0003] Due to the excellent monochromaticity of lasers, which is beneficial for improving detection accuracy, laser ranging is widely used in distance measurement. Currently, the commonly used laser radar wavelengths in handheld lasers on the market are 850nm and 905nm, with a detection range between 20m and 150m. Since its ranging principle is based on light reflection, the distance is calculated by measuring the round-trip time of the laser at the target distance. This method is prone to diffuse reflection, which affects its ranging performance. At the same time, the lasers currently used have relatively weak penetrating power, making it challenging to achieve distance detection through obstacles. Summary of the Invention

[0004] To address the shortcomings of the prior art, this invention provides a laser ranging device and method. The laser ranging sensing device of this invention utilizes 980nm light to excite NaYF4:Yb 3+ Er 3+ The adjustable emission color of @NaYF4 material enables laser ranging through obstacles, solving the problem of severe diffuse reflection in traditional laser ranging and providing a new approach to ranging through obstacles.

[0005] A laser ranging device includes a laser, a sensing device, a processor, and a display device; the laser emits light to the sensing device, the processor processes the optical information from the sensing device, and transmits it to the display device; the laser is a 980nm laser, and the sensing device is coated with NaYF4:Yb. 3+ Er 3+ Photodiode chip made of NaYF4 material.

[0006] The photodiode chip is a commercially available product, and all photodiode chips on the market can be used in the sensing device.

[0007] As a preferred embodiment of the present invention, the NaYF4:Yb 3+Er 3+ @NaYF4 material has a core-shell structure. The core-shell coating can passivate defects on the surface of the original particles, thereby enhancing the optical properties of the upconversion nanoparticles.

[0008] As a preferred embodiment of the present invention, the laser ranging sensing device uses NaYF4:Yb 3+ Er 3+ The coating amount of @NaYF4 material is 0.1-0.3g.

[0009] As a preferred embodiment of the present invention, the method for preparing the laser ranging sensing device includes the following steps:

[0010] Step 1: Mix epoxy resin A and epoxy resin B at a mass ratio of 3:1 and stir until homogeneous;

[0011] Step 2: Combine NaYF4:Yb 3+ Er 3+ @NaYF4 material is added to the above-mentioned mixed epoxy resin adhesive, wherein NaYF4:Yb 3 + Er 3+ The mass ratio of @NaYF4 material to mixed epoxy resin is 1:10. After stirring evenly, a mixture is obtained.

[0012] Step 3: Coat the surface of the photodiode chip with the mixture, and after encapsulation, vacuum dry to obtain the laser ranging sensing device.

[0013] As a preferred embodiment of the present invention, the NaYF4:Yb 3+ Er 3+ The preparation method of @NaYF4 material includes the following steps:

[0014] (1) Under a protective gas, YCl3 solution, YbCl3 solution and ErCl3 solution are mixed in a mixed solution of octadecene and oleic acid, stirred and heated to 100℃ and kept at that temperature for 10 min, then heated to 110℃ and kept at that temperature for 1 h, then heated to 130℃ and kept at that temperature for 15 min, and then cooled to 45℃.

[0015] (2) Then add NaOH methanol solution and NH4F methanol solution, raise the temperature to 49℃ and keep it at 30 min, then continue to raise the temperature to 304℃ and keep it at 60 min, then cool the solution to room temperature; finally, wash the reaction sample with anhydrous ethanol and cyclohexane to obtain NaYF4:49%Yb,1%Er, disperse the prepared NaYF4:49%Yb,1%Er in 10 mL of cyclohexane to obtain NaYF4:49%Yb,1%Er dispersion;

[0016] (3) Under a protective gas atmosphere, NaYF4:49%Yb,1%Er dispersion, octadecene and oleic acid were stirred and heated to 100℃ and kept at that temperature for 30 min.

[0017] (4) Under reflux conditions, the temperature is raised to 270°C and a mixture of sodium yttrium fluoride-oleic acid precursor and sodium trifluoroacetate-oleic acid precursor is injected;

[0018] (5) Finally, the sample was cooled to room temperature, washed, and dried to obtain NaYF4:Yb 3+ Er 3+ @NaYF4 material.

[0019] As a preferred embodiment of the present invention, the method for preparing the sodium yttrium fluoride-oleic acid precursor includes the following steps:

[0020] Mix 5 ml of 0.1 M YCl3 solution with 15 ml of octadecene and 10 ml of oleic acid, stir under a protective gas and heat to 100 °C for 10 min, then heat to 110 °C for 1 h, continue heating to 130 °C for 15 min, then continue heating to 150 °C for 30 min, and finally cool to room temperature and store in a glass bottle in a refrigerator.

[0021] As a preferred embodiment of the present invention, the method for preparing the sodium trifluoroacetate-oleic acid precursor includes the following steps:

[0022] Dissolve sodium trifluoroacetate powder in a small amount of methanol using ultrasonication, then add oleic acid and place in a vacuum environment to allow the methanol solution to evaporate completely. Finally, seal and refrigerate the solution.

[0023] In a preferred embodiment of the present invention, the molar concentration ratio of YCl3, YbCl3 and ErCl3 is 0.5:0.49:0.01.

[0024] In a preferred embodiment of the present invention, in step (1), the volume ratio of YCl3 solution, octadecene, and oleic acid is 1:14:6.

[0025] In a preferred embodiment of the present invention, in steps (1) and (2), the volume ratio of NaOH, NH4F and oleic acid is 2:6.6:6.

[0026] In a preferred embodiment of the present invention, in step (3), the volume ratio of NaYF4:49%Yb,1%Er dispersion, octadecene and oleic acid is 2.5:6:4.

[0027] In a preferred embodiment of the present invention, in step (4), the ratio of sodium yttrium fluoride-oleic acid precursor, sodium trifluoroacetate-oleic acid precursor and NaYF4:49%Yb,1%Er dispersion is 8:4:5.

[0028] In step (1), the stirring rate is 600 rad / min; in step (3), the stirring rate is 800 rad / min.

[0029] The protective gas is argon, nitrogen, or helium.

[0030] The distance measurement process of the laser rangefinder includes:

[0031] First, the laser emits a laser beam to a sensing device at the location of the target object. The sensing device generates different emission colors and spectral information, and the distance between the laser and the target object is initially determined based on the emission color.

[0032] Then, the processor converts the spectral information into distance information and transmits it to the display device, so that the exact distance to the target object can be determined.

[0033] The laser ranging device of the present invention uses a fiber optic spectrometer to read spectral information.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows: The laser ranging device of the present invention will measure NaYF4:Yb 3+ Er 3+ @NaYF4 material is encapsulated in a photodiode as an optical sensing device for distance detection, utilizing the NaYF4:Yb material under 980nm light excitation. 3+ Er 3+ Yb in NaYF4 material 3+ Er acts as a sensitizer to absorb laser light. 3+ As an activator, it emits tunable visible light that is visible to the human eye. Therefore, the distance to a target can be initially determined in real time based on its color, and further information can be obtained from NaYF4:Yb. 3+ Er 3+ The spectral information generated by the @NaYF4 material further yields accurate distance measurements of the target object. Therefore, the sensing device features excellent detection accuracy and real-time response characteristics, enabling precise target identification and high-precision dynamic obstacle-penetrating distance measurement. Attached Figure Description

[0035] Figure 1 It is the NaYF4:Yb 3+ Er 3+ Flowchart of the preparation method for @NaYF4 material.

[0036] Figure 2This refers to the NaYF4:49%Yb,1%Er prepared in Example 1 of this invention. 3+ Er 3+ XRD pattern comparing @NaYF4 with the standard card; in the figure, NaYF4:Yb,Er is equivalent to NaYF4:49%Yb,1%Er.

[0037] Figure 3 These are physical images and light-emitting images of the sensing device according to Embodiment 1 of the present invention; the left image is the physical image, and the right image is the light-emitting image.

[0038] Figure 4 It is the adjustable light emission pattern generated by the sensing device described in Embodiment 1 of the present invention as the target distance changes.

[0039] Figure 5 This is a visualization of distance information obtained in Embodiment 1 of the present invention.

[0040] Figure 6 This is the optical information image on the sensing device when the laser ranging device described in Embodiment 1 of the present invention measures a distance of 1 cm from the target object.

[0041] Figure 7 This is the optical information image on the sensing device when the laser ranging device described in Embodiment 1 of the present invention measures a distance of 1.5cm from the target object.

[0042] Figure 8 This is the optical information image on the sensing device when the laser ranging device described in Embodiment 1 of the present invention measures a distance of 2cm from the target object.

[0043] Figure 9 This is the optical information image on the sensing device when the laser ranging device described in Embodiment 1 of the present invention measures a distance of 4.9 cm from the target object.

[0044] Figure 10 This is the optical information image on the sensing device when the laser ranging device described in Embodiment 1 of the present invention measures a distance of 4cm from the target object.

[0045] Figure 11 This is the optical information image on the sensing device when the laser ranging device described in Embodiment 1 of the present invention measures a distance of 9cm from the target object.

[0046] Figure 12 This is the optical information image on the sensing device when the laser ranging device described in Embodiment 1 of the present invention measures a distance of 7cm from the target object.

[0047] Figure 13 This is the optical information image on the sensing device when the laser ranging device described in Embodiment 1 of the present invention measures a distance of 6.3 cm from the target object.

[0048] Figure 14 This is the optical information image on the sensing device when the laser ranging device described in Embodiment 1 of the present invention measures a distance of 10cm from the target object.

[0049] Figure 15 This is the optical information image on the sensing device when the laser ranging device described in Embodiment 1 of the present invention measures a distance of 15cm from the target object.

[0050] Figure 16 This is the optical information image on the sensing device when the laser ranging device described in Embodiment 1 of the present invention measures a distance of 20cm from the target object. Detailed Implementation

[0051] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0052] Example 1

[0053] The NaYF4:Yb described in this embodiment 3+ Er 3+ The preparation method of @NaYF4 material, the specific steps are as follows:

[0054] (1) NaYF4: 49% Yb, 1% Er was synthesized by an improved thermal decomposition method.

[0055] Take 1 ml of a solution with a concentration of 0.5 mmol / L. -1 A 0.96 ml solution of YCl3 has a concentration of 0.5 mmol / L. -1 A 0.04 ml solution of YbCl3 has a concentration of 0.5 mmol / L. -1 ErCl3 solution was added to a 100 mL three-necked flask containing 14 mL of octadecene and 6 mL of oleic acid. First, under a high-purity argon atmosphere, the mixture was heated to 100 °C with stirring at 600 rad / min and held for 10 min. The temperature was then increased to 110 °C and held for 1 h to remove excess moisture. The mixture was further heated to 130 °C and held for 15 min to remove any remaining small amount of moisture. The temperature was then increased to 150 °C and held for 30 min to dissolve the oleic acid-coated reagent. The temperature was then lowered to 45 °C. Next, 2 mL of NaOH and 6.6 mL of NH4F (dissolved in methanol) were added to the above reaction solution, and the temperature was increased to 49 °C and held for 30 min. The temperature was then increased to 304 °C and held for 60 min to induce nucleation and crystallization. Finally, the solution was cooled to room temperature, and the sample preparation was complete. Finally, the reaction sample was washed 3-6 times with anhydrous ethanol / cyclohexane, and the prepared NaYF4:49%Yb,1%Er was dispersed in 10 mL of cyclohexane for later use.

[0056] (2) Synthesis of NaYF4:Yb by hot injection method 3+ Er 3+@NaYF4.

[0057] First, 2.5 mL of the above NaYF4:49%Yb,1%Er liquid, 6 mL of octadecene, and 4 mL of oleic acid were added to a 100 mL three-necked flask. The mixture was stirred at 800 rad / min under a high-purity argon atmosphere and slowly heated to 100 °C for 30 min to remove cyclohexane. Next, the temperature was raised to 270 °C under reflux, and a mixture of 4 mL of sodium yttrium fluoride-oleic acid precursor and 2 mL of sodium trifluoroacetate-oleic acid precursor was slowly injected in three portions over 3 hours. Finally, after the core-shell structure growth was completed, the temperature was cooled to room temperature, the sample was removed, washed 3-6 times with anhydrous ethanol / cyclohexane, and dried into powder to obtain NaYF4:Yb. 3+ Er 3+ @NaYF4 material.

[0058] The preparation method of the sodium yttrium fluoride-oleic acid precursor includes the following steps: 5 ml of 0.1 M YCl3 solution is mixed with 15 ml of octadecene and 10 ml of oleic acid, stirred in a protective gas and heated to 100 °C for 10 min, then heated to 110 °C for 1 h, then heated to 130 °C for 15 min, then heated to 150 °C for 30 min, and finally cooled to room temperature and stored in a glass bottle in a refrigerator.

[0059] The preparation method of the sodium trifluoroacetate-oleic acid precursor includes the following steps: 4.486 g of sodium trifluoroacetate powder is ultrasonically dissolved in 2 ml of methanol, then 80 ml of oleic acid is added and placed in a vacuum environment to allow the methanol solution to completely evaporate, and finally it is sealed and refrigerated.

[0060] The specific steps for preparing the sensing device described in this embodiment are as follows:

[0061] (1) Add liquid epoxy resin A and epoxy resin B into centrifuge tubes in a mass ratio of 3:1. Stir with a toothpick in a clockwise direction for 20 minutes to mix the two resins A and B evenly.

[0062] (2) NaYF4:Yb 3+ Er 3+ Add the @NaYF4 material to the above mixed epoxy resin adhesive, and stir again with a toothpick clockwise for 20 minutes until the powder and adhesive are evenly mixed.

[0063] (3) Remove the plastic shell on the commercial photodiode chip, coat the chip surface with the colloid of the above mixed powder, and put the sealed sensing device into a 40°C oven for vacuum drying.

[0064] A laser ranging device includes a laser, a sensing device prepared in Example 1, a processor, and a display device; the laser emits a light source onto the sensing device, the processor processes the optical information of the sensing device, and transmits it to the display device; the laser is a 980nm laser.

[0065] This embodiment utilizes a marine optical fiber spectrometer to read optical spectral information from the sensing device.

[0066] Figure 2 As can be seen from the present invention, the NaYF4:49%Yb,1%Er and NaYF4:Yb prepared by the present invention 3+ Er 3+ @NaYF4 corresponds to the respective standard cards, and no impurity peaks appear, indicating that the preparation method described in this invention yields high-purity NaYF4:49%Yb,1%Er and NaYF4:Yb. 3+ Er 3+ @NaYF4 material.

[0067] Figure 3 As can be seen from the above, the sensing device described in this invention has light response properties that vary with distance after encapsulation. In a dark environment, when the distance between the laser emitting the stimulus and the sensing device is about 10cm, the sensing device emits a dazzling yellow light.

[0068] Figure 4 As can be seen, when the sensing device is placed in front of the target object, the device emits different colors of light as the distance between the 980nm laser and the sensing device changes, thus allowing for a rough measurement of the distance between the target object and the emitting device. The color of the sensing device changes from yellow to red, yellow, and green as the distance increases. Specifically, when the light emission color is yellow, the distance to the target object can be roughly estimated as 0-2cm or 7-12cm; when the light emission color is red, the distance is estimated as 2-7cm; and when the light emission color is green, the distance is estimated as 12cm or more. Furthermore, the distance can be further refined based on the intensity of each light emission color.

[0069] Figure 5 As can be seen, when the sensing device produces a color change, its optical information data can be transmitted to the visualization interface via a fiber optic spectrometer. The figure shows the spectral information emitted by the sensing device when the distance between the target object and the 980nm transmitter is 2cm. From the spectrum, it can be seen that the sensing device emits green light at wavelengths of 526nm and 539nm and red light at 654nm under laser stimulation. Since 654nm is dominant, the overall emission from the sensing device is a reddish-yellow light. This demonstrates that the device can measure the distance to objects.

[0070] Comparative Example 1

[0071] The preparation method of NaYF4:49%Yb,1%Er described in this comparative example includes the following specific steps:

[0072] Take 0.5 mmol of YCl3 solution, 0.49 mmol of YbCl3 solution, and 0.01 mmol of ErCl3 solution and add them to a 100 mL three-necked flask. The flask contains 14 mL of octadecene and 6 mL of oleic acid. First, under a high-purity argon atmosphere, heat to 100 °C with stirring at 600 rad / min and hold for 10 min. Then, raise the temperature to 110 °C and hold for 1 h to remove excess moisture. Continue heating to 130 °C and hold for 15 min to remove any remaining small amount of moisture. Continue heating to 150 °C and hold for 30 min to dissolve the reagent coated with oleic acid. Then, cool to 45 °C. Next, add 2 mL of NaOH and 6.6 mL of NH4F (dissolved in methanol) to the above reaction solution, raise the temperature to 49 °C and hold for 30 min, then raise the temperature to 304 °C and hold for 60 min to nucleate and crystallize. Finally, cool the solution to room temperature. The sample preparation is complete. Finally, the reaction sample was washed 3-6 times with anhydrous ethanol / cyclohexane and dried to obtain NaYF4: 49% Yb, 1% Er.

[0073] The specific steps for preparing the sensing device described in this comparative example are as follows:

[0074] (1) Add liquid epoxy resin A and epoxy resin B to a centrifuge tube in a ratio of 3:1. Stir with a toothpick in a clockwise direction for 20 minutes to mix the two resins A and B evenly.

[0075] (2) Add NaYF4:49%Yb,1%Er material to the above mixed epoxy resin adhesive, and stir again with a toothpick clockwise for 20 minutes until the powder and adhesive are evenly mixed.

[0076] (3) Remove the plastic shell on the commercial photodiode chip, coat the chip surface with the colloid of the above mixed powder, and put the sealed sensing device into a 40°C oven for vacuum drying.

[0077] A laser ranging device includes a laser, a sensing device prepared in Comparative Example 1, a processor, and a display device; the laser emits a light source onto the sensing device, the processor processes the optical information of the sensing device, and transmits it to the display device; the laser is a 980nm laser.

[0078] This comparative example utilizes a marine optical fiber spectrometer to read optical spectral information from a sensing device.

[0079] Comparative Example 2

[0080] The NaYF4:Yb described in this comparative example 3+ Er3+ The preparation method of @NaYF4 material is the same as that in Example 1.

[0081] The preparation method of the sensing device described in this comparative example is the same as that in Example 1.

[0082] A laser ranging device includes a laser, a sensing device prepared in Comparative Example 2, a processor, and a display device; the laser emits a light source onto the sensing device, the processor processes the optical information of the sensing device, and transmits it to the display device; the laser is a 908nm laser.

[0083] This comparative example utilizes a marine optical fiber spectrometer to read optical spectral information from a sensing device.

[0084] Example of effect 1

[0085] This example demonstrates the accuracy of the measurement information provided by the present invention by measuring the same object using the laser ranging device described in Embodiment 1 and Comparative Examples 1-2, as well as a conventional rangefinder. The conventional rangefinder is the official standard rangefinder of the Shendawei SW-TG50, which uses a laser wavelength of 635nm and a power of 1mW.

[0086] The distance measurement process of the laser rangefinder includes:

[0087] First, the laser emits a laser beam to a sensing device at the location of the target object. The sensing device generates different emission colors and spectral information, and the distance between the laser and the target object is initially determined based on the emission color.

[0088] Then, the processor converts the spectral information into distance information and transmits it to the display device, so that the exact distance to the target object can be determined.

[0089] The laser ranging device of the present invention uses a fiber optic spectrometer to read spectral information.

[0090] The measurement results are shown in Table 1 and Figure 6-16 .

[0091] Table 1

[0092]

[0093] As shown in Table 1, when the target object is not obstructed by obstacles, the ranging information of this invention matches the target distance information quite well, indicating that this invention can effectively achieve the ranging function. Firstly, this invention can directly and intuitively observe a rough distance measurement through the color change of the sensing device. That is, when the emitted color is yellow, the distance to the target object can be roughly estimated as 0-2cm or 7-12cm; when the emitted color is red, the distance between the measured objects is 2-7cm; and when the emitted color is green, the distance between the measured objects is greater than 12cm. Secondly, this invention can also analyze the spectral information emitted by the sensing device to obtain precise measurement information of the measured target. Therefore, compared with ordinary rangefinders, the main advantages of the device described in this invention are: 1. This invention can achieve distance measurement information acquisition by penetrating obstacles; 2. The ranging principle of this invention is the transmission and energy conversion of photons, thereby avoiding the diffuse reflection problem existing in ordinary laser ranging; 3. This invention obtains precise measurement distance based on spectral information and can visualize the ranging information on a display device, while also allowing for intuitive judgment of distance based on color changes.

[0094] As can be seen from Table 1, when an obstacle is present, the target object is obscured by the obstacle. Ordinary rangefinders cannot penetrate the obstacle to measure distance; they can only measure the distance between the target object and the obstacle. However, this invention can achieve distance measurement by penetrating the obstacle. This is mainly due to the 980nm laser and NaYF4:Yb 3+ Er 3+ The 980nm laser and the NaYF4:Yb material work together synergistically. The 980nm laser provides the laser source stimulation to the material in the sensing device. The material in the sensing device absorbs these near-infrared photons, thereby causing the sensing device to emit light of different colors within the visible wavelength range through energy transfer. Therefore, in the ranging process, the 980nm laser and NaYF4:Yb... 3+ Er 3+ The NaYF4 material is indispensable. If only a 980nm laser is used for ranging, its ranging principle is the same as that of ordinary laser ranging methods, which relies on the principle of light reflection. The distance is calculated by measuring the time required for the light to reflect back and forth. Therefore, the accuracy of ranging is affected by light reflection. Moreover, the difference between Comparative Example 1 and Example 1 is that the upconversion material is NaYF4:49%Yb,1%Er. However, NaYF4:49%Yb,1%Er material cannot achieve the ranging effect. Therefore, the 980nm laser and NaYF4:Yb... 3+ Er 3+ The NaYF4 material and its components are complementary and indispensable. In Comparative Example 2, when the laser wavelength was changed to another 908nm, NaYF4:Yb could not be excited. 3+ Er 3+The NaYF4 material was used, thus enabling successful distance measurement. Therefore, it can be concluded that if only NaYF4:Yb is available... 3+ Er 3+ Using NaYF4 material, or changing the laser wavelength to other ranges such as 908nm, 800nm, or 635nm, successful distance measurement cannot be achieved. However, using this invention for distance measurement solves the problem at its source: firstly, since the distance measurement principle is based on the energy conversion of light absorption, there is no reflection as in ordinary distance measurement processes. Secondly, this invention uses a 980nm laser with strong penetrating power and NaYF4:Yb... 3+ Er 3+ The unique absorption of the @NaYF4 material enables this device to penetrate obstacles for distance measurement. Not only can the color change of the sensor be perceived intuitively, but the specific measurement information can also be viewed on the display device.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A laser ranging device, characterized in that, It includes a laser, a sensing device, a processor, and a display device; the laser emits light to the sensing device, the processor processes the optical information from the sensing device, and transmits it to the display device; the laser is a 980nm laser, and the sensing device is coated with NaYF4:Yb. 3+ Er 3+ A photodiode chip made of NaYF4 material; the laser emits laser light to a sensing device at the location of the target object, and the sensing device generates different emission colors and spectral information, and the distance between the laser and the target object is initially determined based on the emission color.

2. The laser ranging device as described in claim 1, characterized in that, The NaYF4:Yb 3+ Er 3+ @NaYF4 material has a core-shell structure.

3. The laser ranging device as described in claim 1, characterized in that, The laser ranging sensor on NaYF4:Yb 3 + Er 3+ The coating amount of @NaYF4 material is 0.1-0.3g.

4. The laser ranging device as described in claim 1, characterized in that, The NaYF4:Yb 3+ Er 3+ The preparation method of @NaYF4 material includes the following steps: (1) Under a protective gas, YCl3 solution, YbCl3 solution and ErCl3 solution are mixed in a mixed solution of octadecene and oleic acid, stirred and heated to 100℃ and kept at that temperature for 10 min, then heated to 110℃ and kept at that temperature for 1 h, then heated to 130℃ and kept at that temperature for 15 min, and then cooled to 45℃. (2) Then add a methanol solution of NaOH and NH4F, raise the temperature to 49℃ and keep it at that temperature for 30 min, then raise the temperature to 304℃ and keep it at that temperature for 60 min, and then cool the solution to room temperature; finally, wash the reaction sample with anhydrous ethanol and cyclohexane to obtain NaYF4:49%Yb,1%Er, disperse the prepared NaYF4:49%Yb,1%Er in 10 mL of cyclohexane to obtain NaYF4:49%Yb,1%Er dispersion; (3) Under a protective gas, stir the NaYF4:49%Yb,1%Er dispersion, octadecene and oleic acid and heat to 100℃ and keep warm for 30 min; (4) Heating to 270°C under reflux conditions and adding a mixture of sodium yttrium fluoride-oleic acid precursor and sodium trifluoroacetate-oleic acid precursor; (5) Finally, the sample was cooled to room temperature, washed, and dried to obtain NaYF4:Yb 3+ Er 3+ @NaYF4 material.

5. The laser ranging device as described in claim 4, characterized in that, The preparation method of the sodium yttrium fluoride-oleic acid precursor includes the following steps: Mix 5 ml of 0.1 M YCl3 solution with 15 ml of octadecene and 10 ml of oleic acid, stir under a protective gas and heat to 100 °C for 10 min, then heat to 110 °C for 1 h, continue heating to 130 °C for 15 min, then continue heating to 150 °C for 30 min, and finally cool to room temperature and store in a glass bottle in a refrigerator.

6. The laser ranging device as described in claim 4, characterized in that, The preparation method of the sodium trifluoroacetate-oleic acid precursor includes the following steps: Dissolve 4.486 g of sodium trifluoroacetate powder in 2 ml of methanol using ultrasonication, then add 80 ml of oleic acid and place in a vacuum environment to allow the methanol solution to evaporate completely. Finally, seal and refrigerate the solution.

7. The laser ranging device as described in claim 4, characterized in that, In step (1), the molar concentration ratio of YCl3, YbCl3 and ErCl3 is 0.5:0.49:0.01; in step (4), the volume ratio of sodium yttrium fluoride-oleic acid precursor, sodium trifluoroacetate-oleic acid precursor and NaYF4:49%Yb,1%Er dispersion is 8:4:

5.

8. The laser ranging device as described in claim 1, characterized in that, The method for preparing the sensing device includes the following steps: Step 1: Mix epoxy resin A and epoxy resin B at a mass ratio of 3:1 and stir until homogeneous; Step 2: Combine NaYF4:Yb 3+ Er 3+ @NaYF4 material is added to the above mixed epoxy resin adhesive and stirred evenly to obtain a mixture; Step 3: Coat the surface of the photodiode chip with the mixture, and after encapsulation, vacuum dry to obtain the laser ranging sensing device.

9. The ranging method of the laser ranging device as described in any one of claims 1-8, characterized in that, Includes the following steps: By using a processor to convert spectral information into distance information and transmitting it to a display device, the exact distance to the target object can be determined.

Images