CN113940669A - Full-paper sweat latent fingerprint thermal fluorescence display equipment and method - Google Patents
Full-paper sweat latent fingerprint thermal fluorescence display equipment and method Download PDFInfo
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- CN113940669A CN113940669A CN202111366626.0A CN202111366626A CN113940669A CN 113940669 A CN113940669 A CN 113940669A CN 202111366626 A CN202111366626 A CN 202111366626A CN 113940669 A CN113940669 A CN 113940669A
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/117—Identification of persons
- A61B5/1171—Identification of persons based on the shapes or appearances of their bodies or parts thereof
- A61B5/1172—Identification of persons based on the shapes or appearances of their bodies or parts thereof using fingerprinting
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Abstract
The invention discloses full-paper sweat latent fingerprint thermal fluorescence display equipment and a full-paper sweat latent fingerprint thermal fluorescence display method, wherein the equipment comprises a transmission part, a sample support, a heating box and an observation box; the transmission part comprises a transmission rack, a transmission synchronous belt mechanism is arranged on the transmission rack, and the transmission synchronous belt mechanism is used for supporting the sample to the inside of the heating box or sending the sample out of the inside of the heating box; the transmission rack is also provided with a gray scanning CCD device which is positioned above the transmission synchronous belt mechanism and in front of the heating box; a heating device and a temperature sensor are arranged in the heating box, and the heating device is separated from the temperature sensor; a blue light source and an ultraviolet light source are arranged inside the observation box; the top surface inside the observation box is provided with an observation CCD device; and an observation window is arranged on the top surface of the observation box. The method can improve the evidence obtaining quality of the sweat latent fingerprints on the paper.
Description
Technical Field
The invention relates to the technical field of material evidence identification, in particular to equipment and a method for full-paper sweat latent fingerprint thermal fluorescence display.
Background
Paper is a very common information carrier, is visible everywhere in life, fingerprint identification is also one of important ways for individual identification, and paper carriers are frequently encountered in fingerprint showing work. For a long time, latent sweat fingerprints on paper are almost treated by a chemical method, such as ninhydrin, DFO, indandione and the like, however, the chemical method can dye the paper itself, destroy material evidence, greatly interfere document inspection work such as handwriting identification and the like, and chemical residues on the paper can also influence a series of subsequent DNA identification and other work. Moreover, the chemical reagent itself has a certain toxicity, and the physical health of the inspection personnel is also threatened. Therefore, a non-toxic, harmless, nondestructive and rapid paper latent sweat fingerprint display mode is urgently needed by the appraisers.
The thermotropic fluorescence technology is a safe, convenient and nondestructive inspection method for showing sweat latent fingerprints of paper in recent years. The process is that after being heated at a proper temperature, paper is placed in an excitation environment of blue-green light, and fluorescent sweat latent fingerprints can be observed through an orange light filtering device. The method does not pollute and damage the paper inspection material, and the whole experiment process is non-toxic and harmless to the appraisers, so the thermoluminescence technology can become a first-choice treatment method for showing the sweat latent fingerprints of the paper. However, the optimal display temperature and time of different types of paper are different, the higher the whiteness of the paper, the lower the temperature and heating time required for achieving the optimal display effect, the heating mode has great influence on the heating uniformity of the paper, and the temperature measurement values obtained by different temperature measurement and control modes are different from the final actual temperature of the paper. Moreover, the fluorescence emission light intensity after the fingerprint is displayed is weak, and the fluorescence emission light intensity is often buried in a high-intensity excitation light source, so that the image quality cannot meet the identification requirement.
The fingerprint heat showing processing device on the market is an open structure at present, a temperature measuring point is also arranged on the heating sheet, and the measured temperature belongs to a certain specific area of the heating sheet instead of the paper, so that the temperature of the paper cannot be accurately controlled. The heating device is not equipped with a whiteness test, so that the temperature and the heating time required by the paper with different whiteness base colors cannot be adjusted, and only the whole category of paper can be summarized. The wavelength range of the excitation light source is wide, and the stray light wave band which cannot excite the sweat fingerprint fluorescence is more. The CCD used for fingerprint imaging is also not equipped with a filter matching the wavelength of the sweat fingerprint fluorescence emission, resulting in the annihilation of the weak fluorescence emission by other light rays.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide equipment and a method for displaying full-paper sweat latent fingerprints in a thermal fluorescence manner.
In order to achieve the purpose, the invention adopts the following technical scheme:
a full-paper sweat latent fingerprint thermal fluorescence display device comprises a transmission part, a sample support, a heating box and an observation box; the transmission part comprises a transmission rack, a transmission synchronous belt mechanism is arranged on the transmission rack, and the transmission synchronous belt mechanism is used for supporting the sample to the inside of the heating box or sending the sample out of the inside of the heating box; the transmission rack is also provided with a gray scanning CCD device which is positioned above the transmission synchronous belt mechanism and in front of the heating box; a heating device and a temperature sensor are arranged in the heating box, and the heating device is separated from the temperature sensor; a blue light source and an ultraviolet light source are arranged inside the observation box; the top surface inside the observation box is provided with an observation CCD device; and an observation window is arranged on the top surface of the observation box.
Further, the observation CCD device is attached with a narrow band filter.
Further, the conveying synchronous belt mechanism comprises a transmission motor, a transmission synchronous belt wheel, a transmission synchronous belt, a conveying belt roller, a conveying belt tensioning roller and a conveying belt; the two ends of the conveying belt are respectively sleeved on the two conveying belt rollers, the output shaft of the transmission motor is coaxially fixed with the transmission synchronous belt wheel, and the transmission synchronous belt wheel is in transmission connection with one of the conveying belt rollers through the transmission synchronous belt; the conveyor belt tensioning roller is abutted against the conveyor belt to tension the conveyor belt.
Further, heating device includes a plurality of heating pipes, the inside upper portion both sides of heating cabinet are equipped with at least one heating pipe respectively, the transmission hold-in range mechanism holds in the palm the sample and conveys the inside lower part of heating cabinet.
Furthermore, a fan is arranged in the heating box.
Furthermore, the bottom of the front side of the heating box is provided with a sample support inlet, and the back side of the heating box is provided with a sample support outlet corresponding to the sample support inlet; the front surface of the observation box is provided with a sample support inlet corresponding to the sample support outlet.
Furthermore, a conveying platform is further arranged inside the observation box and comprises a roller, a roller motor, a synchronous belt wheel and a synchronous belt; two ends of the synchronous belt are respectively sleeved on two synchronous belt wheels, one synchronous belt wheel is synchronously fixed on an output shaft of the roller motor, and the other synchronous belt wheel is coaxially connected with the roller; when the sample holder enters the inside of the observation box, it just falls on the roller.
Still further, be equipped with the introduction port sensor in the observation box, the introduction port sensor is used for responding to the entering of sample support and triggers the roller motor and start.
Further, the wavelength of the blue light source is 480-510nm, and the wavelength of the ultraviolet light source is 330 nm.
The invention also provides a method for utilizing the equipment, which comprises the following specific processes:
fixing the paper to be detected on a sample support, then placing the sample support at the position of a conveyor belt synchronous mechanism in front of a heating box, starting equipment, controlling a gray scanning CCD device by a control system to automatically detect the whiteness of the paper and feed the whiteness back to the control system, and determining the heating temperature and time by the control system according to the whiteness of the paper according to a set program; then the control system controls the heating device to start heating, the temperature sensor feeds the measured temperature in the heating box back to the control system in real time, and the control system further controls the operation of the heating device according to the temperature, so that the temperature in the heating box is ensured to reach the determined temperature; after the temperature in the heating box reaches the determined temperature, the control system controls the conveyor belt synchronizing mechanism to convey the sample support into the heating box, and after the heating time reaches the determined heating time, the control system controls the conveyor belt synchronizing mechanism to convey the sample support out of the heating box;
the conveyor belt synchronization mechanism further conveys the sample support into the observation box, the control system controls the opening of a blue light source or an ultraviolet light source inside the observation box to serve as an excitation light source, then the CCD device is controlled to be opened for observation to continuously obtain fingerprint photos on the paper, and the human eyes can observe the appearance condition of potential fingerprints on the paper through the observation window; and after the test is finished, taking out the sample holder from the observation box to obtain the processed paper certificate.
The invention has the beneficial effects that: the invention can detect the whiteness of the paper, realize the determination of the optimal heating temperature and time, control the heating temperature accurately and uniformly, thereby ensuring the detected fingerprint to achieve the maximum fluorescence intensity, and enhance the image precision through a specific excitation light source and a light filter, thereby achieving the purpose of displaying the sweat latent fingerprint on the paper without damage and being beneficial to improving the evidence obtaining quality of the sweat latent fingerprint on the paper.
Drawings
FIG. 1 is an overall schematic view of an apparatus in example 1 of the present invention;
FIG. 2 is a schematic structural view of a transmission frame according to embodiment 1 of the present invention;
FIG. 3 is a schematic structural view of a sample holder according to example 1 of the present invention;
FIG. 4 is a schematic sectional view of a heating tank in example 1 of the present invention;
FIG. 5 is a schematic sectional view of an observation box in example 1 of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and it should be noted that the present embodiment is based on the technical solution, and the detailed implementation and the specific operation process are provided, but the protection scope of the present invention is not limited to the present embodiment.
Example 1
The embodiment provides a full-paper sweat latent fingerprint thermal fluorescence developing device, as shown in fig. 1-5, comprising a transmission part 1, a sample holder 2, a heating box 3 and an observation box 4; the transmission part 1 comprises a transmission rack 11, a transmission synchronous belt mechanism is arranged on the transmission rack 11, and the transmission synchronous belt mechanism is used for conveying the sample holder 2 into the heating box 3 or conveying the sample holder out of the heating box 3; the transmission rack 1 is also provided with a gray scanning CCD device 18 which is positioned above the transmission synchronous belt mechanism and in front of the heating box 3; a heating device and a temperature sensor 32 are arranged in the heating box 3, and the heating device is separated from the temperature sensor 32; a blue light source 42 (two) and an ultraviolet light source 412 (two) are arranged in the observation box 4; an observation CCD device 43 is arranged on the top surface inside the observation box 4; the top surface of the observation box 4 is provided with an observation window 413.
In the above apparatus, the heating of the paper sample is realized by the structure of the casing, and the inside of the casing can be kept warm, thereby preventing rapid heating and rapid cooling temperature unevenness caused by exposing the sample to the air. In addition, the box body structure is utilized to realize the observation and fingerprint photographing of the paper sample, and the interference of external stray light on the inspection can be avoided.
Preferably, the heating box can be made of heat-insulating materials, and the observation box is made of light-resistant materials.
In this embodiment, the observation CCD device 43 is attached with a narrow band filter 411. Further, this example employs an orange (587.8 nm. + -. 32.1nm) narrowband filter. A narrow-band filter is attached to the observation CCD device 43 to filter stray light, thereby enhancing image quality.
In this embodiment, the transmission synchronous belt mechanism includes a transmission motor 12, a transmission synchronous pulley 13, a transmission synchronous belt 14, a conveyor belt roller 15, a conveyor belt tensioning roller 16, and a conveyor belt 17; the two ends of the conveyor belt 17 are respectively sleeved on two conveyor belt rollers 15, the output shaft of the transmission motor 12 is coaxially fixed with the transmission synchronous belt wheel 13, and the transmission synchronous belt wheel 13 is in transmission connection with one of the conveyor belt rollers 15 through a transmission synchronous belt 14; the belt tensioning roller 16 tensions the conveyor belt 17 against it.
It should be noted that, the sample holder 2 is placed at a position where the conveyor belt 17 is located in front of the heating box, the transmission motor 12 is started, an output shaft of the transmission motor drives the transmission synchronous belt pulley 13 to rotate, the transmission synchronous belt pulley 13 drives one of the conveyor belt rollers 15 to rotate through the transmission synchronous belt 14, so that the conveyor belt 17 and the other conveyor belt roller 15 are driven to rotate, and the transmission of the sample holder 2 is realized.
In this embodiment, the sample holder 2 includes a sample holder base plate 21 and sample holder clips 22 provided at four corners of the sample holder base plate 21. The sheet is set on a sample holder base plate 21 and is held by a sample holder clamp 22.
In this embodiment, the heating device includes a plurality of heating pipes 33, at least one heating pipe 33 is respectively disposed on two sides of the upper portion inside the heating box 33, and the transmission timing belt mechanism transmits the sample holder to the lower portion inside the heating box 3. The heating pipe sets up in heating cabinet upper portion, avoids paper and heating pipe direct contact to lead to catching fire.
In the present embodiment, the inside of the heating box 3 is provided with a fan 34. Set up the air flow that the fan can strengthen in the heating cabinet 3, guarantee the inside temperature uniformity of heating cabinet 3.
Further, in the present embodiment, a partition plate 35 is disposed below the fan 34, and the fan 34 is fixed on the partition plate 35; the temperature sensor 32 is fixed to the middle of the partition 35. The temperature sensor is not directly connected with the heating pipe, the gas temperature in the heating box is measured, and the gas temperature in the heating box is uniform, so that the actual temperature of the paper is measured.
In this embodiment, the front bottom of the heating box 3 is provided with a sample holder inlet 36, and the back thereof is provided with a sample holder outlet corresponding to the sample holder inlet 36; the front surface of the observation box 4 is provided with a sample holder inlet 410 corresponding to the sample holder outlet of the heating box 3.
Further, in the present embodiment, a conveying platform is further provided inside the observation box 4, and the conveying platform includes a roller 49, a roller motor 44, a synchronous pulley 45 and a synchronous belt 47; two ends of the synchronous belt 47 are respectively sleeved on two synchronous belt wheels 45, one synchronous belt wheel 45 is synchronously fixed on an output shaft of the roller motor 44, and the other synchronous belt wheel 45 is coaxially connected with the roller 49; when the sample holder 2 enters the inside of the observation box 4, it just falls on the roller 49. After the sample holder heated by the heating box is sent to the sample inlet 410 of the observation box 4, the roller motor 44 is started, the output shaft thereof drives one of the synchronous belt pulleys 45 to rotate, the synchronous belt pulley 45 drives the other synchronous belt pulley 45 to rotate through the synchronous belt 47, and then drives the roller 49 to rotate, and the roller 49 further rolls the sample holder 2 to the inside of the observation box 4 for observation.
Further, in this embodiment, an inlet sensor 48 is disposed on the inner side of the front surface of the observation box 4 and above the inlet 410, and the inlet sensor 48 is used for sensing the entrance of the sample tray 2 and triggering the roller motor 44 to start.
In this embodiment, a periphery of the observation window 413 is provided with a fence, and a window cover 414 is disposed to cover the observation window 413. Through enclosing the setting of fender, observation window, can keep warm, keep dark prerequisite under the detection process in addition manual observation.
In this embodiment, an opening is provided on one side of the observation box 4, and a side door is provided with a handle 46. The observed sample holder is taken out from an opening at the side door.
In this embodiment, the wavelength of the blue light source is 480-510nm, and the wavelength of the ultraviolet light source is 330 nm.
Example 2
The present embodiment provides a method using the device described in embodiment 1, which includes the following specific steps:
fixing the paper to be detected on a sample support, then placing the sample support at the position of a transmission synchronous belt mechanism in front of a heating box, starting the equipment, controlling a gray scanning CCD device by a control system to automatically detect the whiteness of the paper and feed back the whiteness to the control system, and determining the heating temperature and time by the control system according to the whiteness of the paper according to a set program (the corresponding relation between the whiteness of the paper and the heating temperature and time is preset by a worker); then the control system controls the heating device to start heating, the temperature sensor feeds the measured temperature in the heating box back to the control system in real time, and the control system further controls the operation of the heating device according to the temperature, so that the temperature in the heating box is ensured to reach the determined temperature; after the temperature in the heating box reaches the determined temperature, the control system controls the transmission synchronous belt mechanism to send the sample support into the heating box 3, and after the heating time reaches the determined heating time, the control system controls the conveyor belt synchronous mechanism to send the sample support out of the heating box;
the transmission synchronous belt mechanism further transmits the sample support into the observation box, the control system controls a blue light source or an ultraviolet light source inside the observation box 4 to be started to serve as an excitation light source, then the observation CCD device is controlled to be started to continuously obtain fingerprint photos on the paper, and the human eyes can observe the appearance condition of potential fingerprints on the paper through the observation window; and after the test is finished, taking out the sample holder from the observation box to obtain the processed paper certificate.
Various corresponding changes and modifications can be made by those skilled in the art based on the above technical solutions and concepts, and all such changes and modifications should be included in the protection scope of the present invention.
Claims (10)
1. A full-paper sweat latent fingerprint thermal fluorescence display device is characterized by comprising a transmission part, a sample support, a heating box and an observation box; the transmission part comprises a transmission rack, a transmission synchronous belt mechanism is arranged on the transmission rack, and the transmission synchronous belt mechanism is used for supporting the sample to the inside of the heating box or sending the sample out of the inside of the heating box; the transmission rack is also provided with a gray scanning CCD device which is positioned above the transmission synchronous belt mechanism and in front of the heating box; a heating device and a temperature sensor are arranged in the heating box, and the heating device is separated from the temperature sensor; a blue light source and an ultraviolet light source are arranged inside the observation box; the top surface inside the observation box is provided with an observation CCD device; and an observation window is arranged on the top surface of the observation box.
2. The full-paper sweat latent fingerprint thermoluminescence visualization device according to claim 1, wherein a narrow band filter is attached to the observation CCD means.
3. The full-paper sweat latent fingerprint thermoluminescence visualization device according to claim 1, wherein the transmission synchronous belt mechanism comprises a transmission motor, a transmission synchronous pulley, a transmission synchronous belt, a transmission belt roller, a transmission belt tensioning roller and a transmission belt; the two ends of the conveying belt are respectively sleeved on the two conveying belt rollers, the output shaft of the transmission motor is coaxially fixed with the transmission synchronous belt wheel, and the transmission synchronous belt wheel is in transmission connection with one of the conveying belt rollers through the transmission synchronous belt; the conveyor belt tensioning roller is abutted against the conveyor belt to tension the conveyor belt.
4. The full-paper sweat latent fingerprint thermoluminescence visualization device according to claim 1, wherein the heating means comprises a plurality of heating pipes, at least one heating pipe is respectively provided on both sides of the upper portion inside the heating box, and the transmission timing belt mechanism transmits the sample holder to the lower portion inside the heating box.
5. The full-paper sweat latent fingerprint thermoluminescence visualization device according to claim 1 or 4, wherein a fan is provided inside the heating box.
6. The full-paper sweat latent fingerprint thermoluminescence visualization device according to claim 1, wherein the bottom of the front surface of the heating box is provided with a sample holder inlet, and the back surface thereof is provided with a sample holder outlet corresponding to the sample holder inlet; the front surface of the observation box is provided with a sample support inlet corresponding to the sample support outlet.
7. The full-paper sweat latent fingerprint thermally induced fluorescence developing device according to claim 1 or 6, wherein a conveying platform is further arranged inside the observation box, and the conveying platform comprises a roller, a roller motor, a synchronous pulley and a synchronous belt; two ends of the synchronous belt are respectively sleeved on two synchronous belt wheels, one synchronous belt wheel is synchronously fixed on an output shaft of the roller motor, and the other synchronous belt wheel is coaxially connected with the roller; when the sample holder enters the inside of the observation box, it just falls on the roller.
8. The full-paper sweat latent fingerprint thermoluminescence visualization device according to claim 7, wherein a sample inlet sensor is provided in the observation box, the sample inlet sensor being configured to sense entry of a sample holder and trigger activation of a roller motor.
9. The full-paper sweat latent fingerprint thermoluminescence visualization device according to claim 1, wherein the wavelength of the blue light source is 480-510nm, and the wavelength of the ultraviolet light source is 330 nm.
10. A method using the apparatus of any one of claims 1-9, characterized in that the specific process is:
fixing the paper to be detected on a sample support, then placing the sample support at the position of a transmission belt synchronous mechanism in front of a heating box, starting equipment, controlling a gray scanning CCD device by a control system to automatically detect the whiteness of the paper and feed the whiteness back to the control system, and determining the heating temperature and time by the control system according to the whiteness of the paper according to a set program; then the control system controls the heating device to start heating, the temperature sensor feeds the measured temperature in the heating box back to the control system in real time, and the control system further controls the operation of the heating device according to the temperature, so that the temperature in the heating box is ensured to reach the determined temperature; after the temperature in the heating box reaches the determined temperature and is balanced and stable, the control system controls the transmission belt synchronization mechanism to send the sample support into the heating box, and after the heating time reaches the determined heating time, the control system controls the transmission belt synchronization mechanism to send the sample support out of the heating box;
the transmission belt synchronization mechanism further transmits the sample support into the observation box, the control system controls the opening of a blue light source or an ultraviolet light source inside the observation box to serve as an excitation light source, then the CCD device is controlled to be opened for observation, hand print pictures on the surface of the paper are continuously obtained, and the human eyes can observe the appearance condition of potential hand prints on the paper through the observation window; and after the test is finished, taking out the sample holder from the observation box to obtain the processed paper certificate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111366626.0A CN113940669A (en) | 2021-11-18 | 2021-11-18 | Full-paper sweat latent fingerprint thermal fluorescence display equipment and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111366626.0A CN113940669A (en) | 2021-11-18 | 2021-11-18 | Full-paper sweat latent fingerprint thermal fluorescence display equipment and method |
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| CN113940669A true CN113940669A (en) | 2022-01-18 |
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| CN202111366626.0A Pending CN113940669A (en) | 2021-11-18 | 2021-11-18 | Full-paper sweat latent fingerprint thermal fluorescence display equipment and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114569119A (en) * | 2022-05-06 | 2022-06-03 | 江苏三汇智能科技有限公司 | Portable intelligent 502 fuming system and using method thereof |
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| CN105588825A (en) * | 2016-01-28 | 2016-05-18 | 公安部物证鉴定中心 | Thermotropic fluorescence detection equipment for latent fingerprints on paper |
| CN205795705U (en) * | 2016-05-11 | 2016-12-14 | 谌飞 | A kind of paper impression of the hand quickly manifests system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20150135628A (en) * | 2014-05-22 | 2015-12-03 | 주식회사 아이큐바이오 | Latent fingerprint detection devices and Method for detecting fingerprints |
| CN104352241A (en) * | 2014-11-15 | 2015-02-18 | 宋志宏 | Infrared ray fingerprint displayer |
| CN204839528U (en) * | 2015-07-12 | 2015-12-09 | 李阳 | Harmless equipment that shows of visual potential impression of hand |
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