CN211148428U

CN211148428U - Criminal investigation is with wide spectrum device of collecting evidence

Info

Publication number: CN211148428U
Application number: CN201921882775.0U
Authority: CN
Inventors: 赵辉; 梁洪易; 罗飞; 梁朝阳
Original assignee: Shenzhen Wayho Technology Ltd
Current assignee: Shenzhen Wayho Technology Ltd
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2020-07-31
Anticipated expiration: 2029-11-04

Abstract

The application discloses a wide-spectrum evidence obtaining device for criminal investigation, which comprises a host, a light source, an achromatic lens and a filter wheel; the light source sets up on achromatic lens's income light end, achromatic lens's play light end passes through the filter wheel with the host computer is connected, the light source includes the first luminophor of multiple different wavelength, and the wavelength of at least one first luminophor is located ultraviolet band, the mutual independent control of the first luminophor of different wavelength, and through above-mentioned mode, the device of collecting evidence of this application portable is favorable to simplifying the process of collecting evidence, improves investigation efficiency.

Description

Criminal investigation is with wide spectrum device of collecting evidence

Technical Field

The application relates to public security criminal investigation technical field, especially relates to a criminal investigation is with wide spectrum device of collecting evidence.

Background

In the process of criminal scene investigation, in order to find more biological inspection materials, potential hand print traces, tool traces and other left traces so as to obtain more detection clues and criminal evidences, the investigation personnel need to apply various technical means to carry out detailed investigation on the criminal scene. The optical visualization technology can not cause damage to the left trace of the crime scene and various inspection materials to a great extent, so that the optical visualization technology is widely applied to the investigation of the crime scene.

The optical visualization technology is a visualization method for visualizing and recording a visible image of a left trace and various physical evidence which are not clearly seen or even invisible to eyes by utilizing the properties and the rules of light and comprehensively utilizing a lighting tool and a photographic apparatus, and comprises various technical means such as ultraviolet visualization, infrared visualization, biological material visualization and the like. Therefore, the technical requirement that an investigator carries various investigation equipment such as an infrared camera, an ultraviolet light source, a multiband light source and the like besides a single-lens reflex camera and a video recorder which are used for shooting and recording images on site, and also needs to switch frequently among various investigation equipment obviously causes the problems of poor portability of the equipment, complicated evidence obtaining process, low investigation efficiency and the like.

SUMMERY OF THE UTILITY MODEL

The main technical problem who solves of this application provides a criminal investigation is with wide spectrum device of collecting evidence, and portable is favorable to simplifying the process of collecting evidence, improves investigation efficiency.

The embodiment of the application provides a wide-spectrum evidence obtaining device for criminal investigation, which comprises a host, a light source, an achromatic lens and a filter wheel provided with an optical filter;

the light source is arranged on the light inlet end of the achromatic lens, the light outlet end of the achromatic lens is connected with the host through the filter wheel, the light source comprises a plurality of first illuminants with different wavelengths, the wavelength of at least one first illuminant is positioned in an ultraviolet band, and the first illuminants with different wavelengths are controlled independently;

the host computer includes image sensor, display screen and matching module respectively with image sensor connects, image sensor receives follows the light signal that achromatic lens jetted out, and will light signal conversion is the signal of telecommunication in order to generate the collection image, matching module is used for after discerning and acquireing fingerprint information in the collection image, will fingerprint information in the collection image matches with the fingerprint information in the policeman database, and output matching result.

Wherein the first light emitters with different wavelengths comprise first light emitters with different light emitting angles;

the first illuminants with the same wavelength and different light-emitting angles are controlled by the programmable controller or different switches, and the first illuminants with the same wavelength and the same light-emitting angles are controlled by the programmable controller or the same switch.

Wherein the light source further comprises an annular lamp cover and a second light emitter, the first light emitter is an L ED lamp and/or a laser, and the second light emitter is a mercury lamp with the light wavelength of 254 nm;

the second luminous body is arranged in the lampshade, and the first luminous bodies are annularly distributed around the second luminous bodies.

Wherein an optical axis of at least a portion of the first light emitter is disposed non-parallel to an optical axis of the achromatic lens.

Wherein an included angle between an optical axis of at least part of the first light emitter and an optical axis of the achromatic lens is 10-30 degrees.

Wherein, the filter wheel comprises a multilayer structure, and the optical filter comprises any one or more of the following combinations: long-wave pass filter and narrow-band filter combination, short-wave pass filter and narrow-band filter combination, long-wave pass filter and notch filter combination.

The laser device is arranged on the light source, the achromatic lens or the filter wheel and used for emitting a preset light spot pattern.

The host computer further comprises a scale calculation module, the laser is a laser emitting grid spot pattern laser, and the scale calculation module calculates the scale of the acquired image according to the following formula:

wherein x represents a scale of an acquired image, Q represents a grid pitch in the grid spot pattern, p represents a pixel size of the image sensor, m represents a grid number, and n represents a pixel element occupied by m grids on an image plane of the image sensor.

The host computer still includes laser rangefinder module and scale calculation module, laser rangefinder module with the laser instrument cooperation is in order to calculate the distance of achromatic lens to object plane, scale calculation module is according to the object distance, the distance and gather the preset relation between the scale of image, image space intercept calculate the scale of gathering the image.

The laser emitted by the laser is a straight light spot pattern or a cross light spot pattern, and the laser is a green laser or a red laser.

The wide-spectrum evidence obtaining device for criminal investigation comprises a host, a light source, an achromatic lens and a filter wheel, wherein the light source is arranged at the light inlet end of the achromatic lens, the light outlet end of the achromatic lens is connected with the host through the filter wheel, and an image sensor is arranged in the host, so that field photos can be collected through the achromatic lens; in addition, the matching module is arranged in the host, so that after the fingerprint information in the collected image is identified and acquired, the fingerprint information in the collected image is matched with the fingerprint information in the public security database, and a matching result is output, so that the suspect can be identified on site, and the investigation efficiency is further improved.

Drawings

FIG. 1 is a schematic diagram of a broad-spectrum forensic device for criminal investigation according to the present application;

FIG. 2 is a schematic diagram of a light source in a wide-spectrum forensic device for criminal investigation according to the present application;

FIG. 3 is a schematic diagram of a first illuminant and an achromatic lens of a wide-spectrum forensic device for criminal investigation according to the present application, with their optical axes arranged in non-parallel;

FIG. 4 is a schematic diagram of light spots and light intensity waveforms in a central region when an included angle between an optical axis of a first light emitter and an optical axis of an achromatic lens is 0;

FIG. 5 is a schematic diagram of light spots and light intensity waveforms in a central region when an included angle between an optical axis of a first light emitter and an optical axis of an achromatic lens is 30 degrees;

FIG. 6 is a schematic diagram of a host architecture provided herein;

FIG. 7 is a schematic view of another configuration of a broad-spectrum forensic device for criminal investigation according to the present application;

FIG. 8 is a schematic diagram of another embodiment of a host computer provided herein;

FIG. 9 is a schematic diagram of another embodiment of a host computer provided herein;

fig. 10 is a schematic view of the imaging principle of the achromatic lens of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The wide-spectrum evidence obtaining device for criminal investigation of the embodiment of the application is a camera device, and can be suitable for showing evidence of criminal investigation sites and taking pictures to obtain evidence.

Referring to fig. 1, the wide-spectrum forensic device for criminal investigation according to the embodiment of the present invention includes a host 10, a light source 20, an achromatic lens 30, and a filter wheel 40 with an optical filter. The host 10 captures a picture through the achromatic lens 30 to implement a photographing function.

The achromatic lens 30 may be a wide-spectrum achromatic fixed focus or zoom lens, and its operating band range is 180nm (nanometers) to 1100 nm.

The light source 20 is disposed at the light incident end of the achromatic lens 30, and may be disposed around the light incident end of the achromatic lens 30. For example, the achromatic lens 30 may be disposed in a lens barrel, which may be a circular barrel, and the light source 20 is correspondingly circular, and the light source 20 is sleeved on the lens barrel and located around the achromatic lens 30. The light source 20 may be an annular light source, the middle area of the annular light source is hollow, and the hollow middle area corresponds to the achromatic lens 30 in position, so that external light can enter the achromatic lens 30 from the middle area. Alternatively, a transparent member, such as a transparent plastic layer or a transparent glass layer, may be disposed in the middle region of the light source 20, so that the achromatic lens 30 can be protected.

In this embodiment, as shown in fig. 2, the light source 20 includes a first light emitter 201, a second light emitter 202, a light shield 203 and a circuit board 204, wherein the first light emitter 201 and the second light emitter 202 are connected to the circuit board 204. The first luminous bodies 201 and the second luminous bodies 202 are arranged in the lamp shade 203, and the first luminous bodies 201 are annularly distributed on the inner periphery of the second luminous bodies 202.

The wavelength of at least one first light emitter 201 may be in an ultraviolet band, for example, the wavelength may be 254nm to perform fingerprint verification, the first light emitter 201 may be a L ED lamp, and may also be a laser light source, for example, a semiconductor laser, an ultraviolet laser, or a solid laser, and the like, and the first light emitter 201 may be, for example, a L ED lamp, the wavelength of the first light emitter 201 may include a plurality of wavelengths of 254nm, 260nm, 265nm, 270nm, 275nm, 280nm, 285nm, 290nm, 295nm, 300nm, 313nm, 365nm, 410nm, 415nm, 450nm, 515nm, 520nm, 550nm, 590nm, 650nm, 750nm, 800nm, 850nm, 900nm, 940nm, 950nm, and the like, that is, the light source 20 includes the first light emitters 201 of the plurality of wavelengths listed above, and of course, the wavelength type of the first light emitter 201 may be selected according to actual needs, and may further include a white light emitter 36L, 366754, L ED red light, and a red light ED.

Wherein the number of the first light emitters 201 of each wavelength may be 1, 2 or more, and the number of the first light emitters 201 of different wavelengths may be the same or different. For example, there may be 2 first illuminants 201 having a wavelength of 254nm in the light source 20, and 4 first illuminants 201 having a wavelength of 270 nm.

Wherein the first light emitters 201 of different wavelengths are controlled by different switches. Therefore, in the using process, the first light emitters 201 with different wavelengths can be selected for irradiation, only different switches are needed to be pressed, switching between different devices is not needed, and the operation is convenient.

In other words, in the embodiment of the present application, the switches of each first light emitter 201 may be individually controlled and independent from each other, so that different lighting effects may be obtained, and the first light emitters 201 may be flexibly selected and switched according to different fields. Of course, in other embodiments, the first light emitters 201 with the same wavelength may be controlled by the same switch, for example, when the first light emitters 201 with the same wavelength have, the structure may be simplified, and when it is necessary to use the first light emitters 201 with one wavelength, all the first light emitters 201 with the same wavelength may be controlled to operate by pressing one switch, which is convenient for operation.

In other embodiments, the first light emitters 201 with different wavelengths may be flexibly controlled by a programmable controller, that is, the first light emitters 201 with different wavelengths may be controlled to be turned on or off or to control the switching time by a programmable control method. The programmable controller can be a single chip microcomputer for example, and program codes are input into the programmable controller in advance, so that different wavelengths can be realized

The switches of the first light emitters are independent from each other, or part of the first light emitters can be controlled to emit light through a program, for example, part of the first light emitters with the same wavelength are controlled to emit light, or two or more kinds of the first light emitters are controlled to emit light, and the specific setting can be set according to actual needs.

The first light emitter can be controlled to be turned on or off by simultaneously setting two control modes of a switch and a programmable controller, and the two control modes are triggered by different switches.

In this embodiment, the light source 20 is disposed on the achromatic lens 30, so that the evidence obtaining device in the embodiment of the present application integrates a photographing function and an illumination function, and only the evidence obtaining device in this embodiment needs to be carried during evidence obtaining, and therefore, the device does not need to carry various devices, and has better portability. Also, the light source 20 includes a plurality of first light emitters 201 of different wavelengths

The first light emitter 201 is controlled by different switches, so that light sources with different wavelengths can be selected through different switches, the types of equipment required to be carried in the evidence obtaining process can be greatly reduced, the light sources are convenient to switch, the evidence obtaining process is simplified, and the investigation efficiency is improved.

The plurality of first light emitters 201 may be uniformly arranged, for example, in a circumferential direction as shown in fig. 2, and may be arranged in one circle, two circles, or even three circles, etc., which may be selected according to the number of the first light emitters. Of course, the plurality of first light emitters 201 may also be non-uniformly arranged.

The second light emitter 202 may be a mercury lamp, primarily for providing 245nm optical radiation, or alternatively the second light emitter 202 may be an L ED lamp, i.e. 254nm optical radiation may be provided by a L ED lamp, whereby power consumption and volume may be reduced.

In addition, the switches of the second light emitter 202 and the first light emitter 201 are independent of each other to individually control the turning on and off of the first light emitter 201 and the second light emitter 202, respectively.

Alternatively, the first light emitters 201 with different wavelengths may include first light emitters with different light emitting angles, that is, in the first light emitters 201, there may be first light emitters with different light emitting angles, for example, the first light emitter 201 with a small light emitting angle may be used for high beam, and the first light emitter 201 with a large light emitting angle may be used for low beam, so that more flexible selection may be possible. Further, in order to facilitate the control, the first illuminants 201 with the same wavelength and different illumination angles may be controlled by a programmable controller or different switches, so that the first illuminants 201 with different illumination angles may be controlled respectively, and the first illuminants 201 with different illumination angles may be flexibly selected according to the evidence obtaining site to operate. The first light emitters 201 with the same wavelength and the same light emitting angle can be controlled by a programmable controller or the same switch, which is beneficial to simplifying the structure.

In addition, the first light emitter 201 may further include a plurality of first light emitters with different powers, for example, a high-power first light emitter may be used for emitting high beam light, and a low-power second light emitter may be used for emitting low beam light.

In the embodiment of the present application, the optical axis of the first light emitter 201 and the optical axis of the achromatic lens 30 may be parallel or non-parallel; alternatively, the optical axis of a part of the first light emitters 201 may be disposed parallel to the optical axis of the achromatic lens 30, and the optical axis of the other part of the first light emitters 201 may be disposed non-parallel to the optical axis of the achromatic lens 30.

For example, as shown in fig. 3, in the present embodiment, the optical axis a of the first light emitter 201 and the optical axis b of the achromatic lens 30 are disposed in non-parallel, and the optical axis a of the first light emitter 201 is inclined toward the optical axis b of the achromatic lens 30 on the light emitting side of the first light emitter 201, that is, the first light emitter 201 is inclined with respect to the optical axis of the achromatic lens 30, so that the problem of weak light in the central area during close-distance photographing can be avoided, which is advantageous for improving uniformity of light irradiation. As shown in fig. 4 and 5, the left diagram of fig. 4 is a schematic diagram of the light spots in the central area when the included angle between the optical axis of the first light emitter 201 and the optical axis of the achromatic lens 30 is 0 °, the right diagram is a waveform diagram of the light intensity in the central area, the left diagram of fig. 5 is a schematic diagram of the light spots in the central area when the included angle between the optical axis of the first light emitter 201 and the optical axis of the achromatic lens 30 is 30 °, and the right diagram is a waveform diagram of the light intensity in the central area.

The included angle between the optical axis of the first light emitter 201 and the optical axis of the achromatic lens 30 may be 10 ° to 30 °, for example, 12 ° or 15 °, or other angle ranges, which is not limited.

In this embodiment, the filter wheel 40 includes a multi-layer structure, which is a multi-layer optical filter structure, that is, the optical filters loaded in the filter wheel 40 may include any one or more of the following: long-wave pass filter and narrow-band filter combination, short-wave pass filter and narrow-band filter combination, long-wave pass filter and notch filter combination. As in the field of physical evidence inspection, 4 kinds of luminescence photography methods are mainly used: the 4 photographing methods can be conveniently realized through organic combination of the light source and the optical filter, so that the portability and the practicability of the evidence obtaining device in the embodiment of the application are greatly improved compared with the conventional equipment.

In this embodiment, the light emitting end of the achromatic lens 30 is connected to the host 10 through the filter wheel 40, so that the host 10 receives the light emitted from the achromatic lens 30 and converts the light signal into an electrical signal to generate and display an image.

As shown in fig. 6, the host 10 includes an image sensor 101, a display screen 102, and a matching module 103. The display screen 102 and the matching module 103 are respectively connected to the image sensor 101, and the image sensor 101 receives an optical signal emitted from the achromatic lens 30 and converts the optical signal into an electrical signal to generate a captured image. The display screen 102 displays the captured image. The matching module 103 is configured to, after recognizing and acquiring the fingerprint information in the acquired image, match the fingerprint information in the acquired image with the fingerprint information in the public security database, and output a matching result, for example, the matching result may be displayed on the display screen 102, for example, the matching result may be displayed on the acquired image displayed on the display screen 102, or the current display of the display screen 102 may be switched to display the matching result. In other embodiments, the matching module 103 may also send the matching result to other terminals by means of remote communication, for example, to a computer or a mobile phone designated by the police department.

The fingerprint information in the public security database can be the fingerprint information of each suspect recorded by the public security department, so that the suspect can be identified on site by automatically matching the fingerprint information of the suspect in the public security database, and the investigation efficiency is improved.

In one embodiment, the matching module 103 may be configured to automatically perform fingerprint identification and fingerprint information acquisition on each captured image generated by the image sensor 101, so that the fingerprint information to be acquired is matched with the fingerprint information in the public security database every time one piece of fingerprint information is acquired. Or, in some other embodiments, a matching button may be set on the host 10, and after an investigator obtains a captured image by shooting through the evidence obtaining device according to the embodiment of the present application, the examiner may press the matching button to trigger the matching module 103 to perform fingerprint information identification and acquisition on the currently obtained captured image, and then perform matching operation, so that the matching module 103 may not need to perform fingerprint identification and acquisition on each captured image, and the computation amount may be greatly reduced.

When the evidence obtaining device of the embodiment is used, the fingerprint search can be carried out through the following steps:

1) uniformly illuminating by scattered light to search various visible fingerprints;

2) directional reflected illumination, dark field illumination to search for potential fingerprints on smooth objects;

3) glancing incidence illumination to search for weak dust fingerprints; irradiating the material to be tested at an angle of approximately 90 degrees;

4) searching potential fingerprints on various objects by using ultraviolet fluorescence and visible fluorescence irradiation, wherein the ultraviolet fluorescence light source can use a first illuminant with the wavelength of 340nm, 360nm or 365 nm; the visible fluorescence light source can use a first illuminant with the wavelength of 450nm, 480nm or 550 nm;

5) by ultraviolet reflection, potential fingerprints on objects which strongly absorb ultraviolet rays are searched. The light source in the case of uv reflection may be 254nm and may for example be illuminated by a second light emitter, and the object may for example be glass, ceramic, enamel, a photograph, a part of a taped surface, a plastic or painted surface, etc. The planar object can be irradiated by the first illuminator which forms an angle of 10-15 degrees with the optical axis of the achromatic lens, and the cylindrical object can be incident by the first illuminator which forms an angle of 10-30 degrees with the optical axis of the achromatic lens.

In another embodiment of the present application, achromatic lens 30 is, for example, a wide-spectrum achromatic zoom lens. Referring to fig. 7, the wide-spectrum forensic device for criminal investigation may further comprise a laser 50. Laser 50 may be disposed on light source 20, achromatic lens 30, or filter wheel 40 to emit laser light having a predetermined speckle pattern, for example, laser 50 may be disposed on a light cover of light source 20.

For example, the laser spot pattern emitted by the laser 50 may be a straight pattern or a cross pattern, or may be other spot patterns such as concentric circles, parallel lines, or a grid. Before using the forensics device of the embodiment of the application to perform forensics, focusing can be performed first. Specifically, the laser 50 is turned on by a switch of the laser 50, then the laser 50 can be made to face a white wall (or a wall surface with other colors or other objects) to print a preset light spot pattern on the white wall, then the focal length of the achromatic lens is manually adjusted, then the display screen 102 of the host 10 is visually observed, when the clear preset light spot pattern is seen on the display screen 102, the focusing operation can be considered to be completed, at this time, the laser 50 can be turned off, and then the evidence obtaining operation is started.

Wherein the laser 50 may be a red laser or a green laser for better focusing.

In the process of fingerprint shooting, a scale needs to be placed generally, and the process of fingerprint matching of a fingerprint photo needs to be completed by matching with the scale of the photo.

Further, as shown in fig. 8, in the present embodiment, the host 10 may further include a scale calculation module 104. The laser 50 is a laser emitting a grid spot pattern laser, which may be a single laser or a combination of line and/or cross lasers to form a grid spot pattern. The scale calculation module 104 calculates the scale of the acquired image according to the following formula:

wherein x represents a scale of an acquired image, Q represents a grid pitch in a grid spot pattern, p represents a pixel size of the image sensor, m represents a grid number, and n represents a pixel element occupied by m grids on an image plane of the image sensor.

Here, when the image sensor 101 and the laser 50 are determined, accordingly, the pixel size of the image sensor and the grid pitch of the grid spot pattern are also determined, and thus Q and p may be set in advance, and m may be arbitrarily set, for example, may be set to 4 grids, 7 grids, or 9 grids, and so on. The scale calculation module 104 calculates pixel n occupied by m grids on the image plane of the image sensor, calculates a scale according to Q, p and m which are preset, and sends the scale to the matching module 103, so that the matching module 103 performs fingerprint matching according to the scale. Output to the display screen 102 for display with the captured image.

Referring to fig. 9 and 10, wherein a in fig. 9 represents an object plane, B represents an image plane, and C represents an achromatic lens, in this embodiment, the host 10 further includes a laser ranging module 105 and a scale calculation module 106. using the principle of laser ranging, the laser ranging module 105 cooperates with the laser 50 to calculate a distance L o from the achromatic lens 30 (i.e., C in fig. 10) to the object plane a, and the scale calculation module 106 calculates a scale of the captured image according to a preset relationship between the distance L o, the distance L o and a scale x of the captured image, and an image-side intercept L'.

Specifically, the scale calculation module 106 calculates the scale according to the following formula:

x＝y'/y＝L'/L

with reference to fig. 10, x represents a scale, y 'represents an image height, y represents an object height, L' represents an image-side intercept, and L represents an object-side intercept, wherein when the achromatic lens 30 has finished focusing clearly, the image-side intercept L 'is fixed, the image-side intercept L' can be calculated by the scale calculation module 106 according to the imaging principle, the distance L o and the object-side intercept L differ by a constant, and the distance x and the distance L o have a preset relationship, so that according to the above conditions, the constant of the difference between L o and the object-side intercept L can be calculated by using the above formula, the object-side intercept L can be calculated, and then the scale can be obtained according to the above formula.

After the scale is calculated, the laser 50 is turned off, and after a picture is taken by the wide-spectrum forensic device for criminal investigation, the calculation module 104 adds the obtained scale information to the taken picture.

It should be noted that, in this embodiment, the same laser 50 is used for focusing and scale calculation, the focusing process and the scale calculation process may be performed simultaneously or sequentially, for example, after focusing, the laser 50 is kept in an on state, then the calculation module 104 starts scale calculation, after the scale calculation is completed, the calculation module 104 may control the laser 50 to be automatically turned off, or the calculation module 104 may output the scale to the display screen 102, and after the user sees the scale, the user manually turns off the laser 50 and then performs a photographing operation.

Wherein, the calculation module 104 may be triggered to perform the scale calculation manually, or the calculation module 104 may perform the scale calculation after detecting that the laser 50 is operated or the operation time exceeds a predetermined time.

By the embodiment of the application, the types of equipment required to be carried in the evidence obtaining process can be greatly reduced, the equipment is convenient to carry, the light source is convenient to switch, the evidence obtaining process is facilitated to be simplified, and the investigation efficiency is improved; in addition, the matching module is arranged in the host, so that after the fingerprint information in the collected image is identified and acquired, the fingerprint information in the collected image is matched with the fingerprint information in the public security database, and a matching result is output, so that the suspect can be identified on site, and the investigation efficiency is further improved.

The above embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present disclosure or those directly or indirectly applied to other related technical fields are intended to be included in the scope of the present disclosure.

Claims

1. A wide spectrum evidence obtaining device for criminal investigation is characterized by comprising a host, a light source, an achromatic lens and a filter wheel provided with an optical filter;

2. The wide-spectrum forensic device to criminal investigation of claim 1 wherein the plurality of different wavelength first illuminants comprise a plurality of different emission angles;

3. The wide-spectrum forensic device according to claim 1 in which the light source further comprises an annular light cover and a second light emitter, the first light emitter being an L ED lamp and/or laser and the second light emitter being a mercury lamp with a wavelength of light of 254 nm;

4. The wide-spectrum forensic device according to claim 1 in which at least part of the first light emitter has an optical axis which is non-parallel to the optical axis of the achromatic lens.

5. The wide-spectrum forensic device according to claim 4 in which at least part of the first illuminant has an angle of 10 ° to 30 ° with the optical axis of the achromatic lens.

6. The wide-spectrum forensic device according to claim 1 in which the filter wheel comprises a multilayer structure and the optical filter comprises any one or combination of: long-wave pass filter and narrow-band filter combination, short-wave pass filter and narrow-band filter combination, long-wave pass filter and notch filter combination.

7. The wide-spectrum forensic device according to claim 1 further comprising a laser for focus, the laser being arranged on the light source, achromatic lens or filter wheel to emit a predetermined pattern of spots.

8. The wide-spectrum forensic device according to claim 7 in which the host computer further comprises a scale calculation module, the laser emitting a grid spot pattern laser, the scale calculation module calculating the scale of the captured image according to the following formula:

9. The wide-spectrum forensic device according to claim 7 in which the host further comprises a laser ranging module cooperating with the laser to calculate the distance of the achromatic lens to the object plane and a scale calculation module calculating the scale of the captured image according to the preset relationship between the object distance, the distance and the scale of the captured image, the image-side intercept.

10. The wide-spectrum forensic device according to claim 7 in which the laser emitted by the laser is a line or cross spot pattern and the laser is a green or red laser.