CN202712684U

CN202712684U - Laser light source system with accurately-adjusted light intensity based on digital micromirror device

Info

Publication number: CN202712684U
Application number: CN 201220306002
Authority: CN
Inventors: 刘一清; 李中楠; 王淑仙
Original assignee: East China Normal University
Current assignee: East China Normal University
Priority date: 2012-06-28
Filing date: 2012-06-28
Publication date: 2013-01-30
Anticipated expiration: 2022-06-28

Abstract

The utility model discloses a laser light source system with accurately-adjusted light intensity based on a digital micromirror device. The system is a photoelectric integrated system. According to the system, an uniform area light source is obtained by adopting a point light source which is generated by a laser light source generating device under the light uniforming action of an optical tunnel, the area light source is uniformly incident onto the digital micromirror device through the incident light path, the output luminous flux is controlled under the action of a micromirror switch, and instructions are sent through a personal computer, the intensity of a spot light source is adjusted, so the advantage of high-accuracy adjustability is realized.

Description

A kind of based on the accurate adjustable laser source system of Digital Micromirror Device luminous intensity

Technical field

The utility model relates to the hot spot light sources technical field, and is particularly a kind of based on the accurate adjustable laser source system of Digital Micromirror Device luminous intensity.

Background technology

Object that self can be luminous is light source.Light source can be divided into nature (natural) light source and artificial light sources.Lamp such as fixed star, firefly light.Artificial light sources is produced light source gradually along with the development of human civilization, science and technology, such as candle, and fluorescent lamp etc.The hot spot light source is the regeneration light source of artificial light sources, and the original light that it the sends luminescent device processing of reforming is to satisfy various fields to the demand of Different Light.This light source can be used in the middle of the upright light microscope high to light source requirements.Collective lighting system has considerable influence to microscopical imaging performance, and it need to provide brightness consistent and uniform object plane illumination.Nowadays in just vertical light microscope, using maximum is led light source, and this led light source is combined according to certain arrangement mode by a lot of light-emitting diodes, and microscope illumination is provided jointly.But because each light-emitting diode has deviation at raw material with when manufacturing, cause life-span and luminous intensity different, stability is different, so have a light-emitting diode unstable at microscopically, just might cause stain and light and shade deviation.In addition, because the quantity of light-emitting diode is always limited, so the adjustable sensitivity of light-source brightness is lower, and brightness of every accent all is the conforming once test to light-emitting diode, can't accomplish the accurately adjustable of brightness, inapplicable to the extremely sensitive observation thing of light intensity.

The utility model content

The purpose of this utility model is provide for the deficiencies in the prior art a kind of based on the accurate adjustable laser source system of Digital Micromirror Device luminous intensity, but this system's luminous intensity accuracy controlling has been filled up the vacancy of market precision tunable light source.

The purpose of this utility model is achieved in that

A kind of based on the accurate adjustable laser source system of Digital Micromirror Device luminous intensity, this system comprises:

One LASER Light Source is for generation of original light source;

One even light optical wand is connected with LASER Light Source;

One input path is connected with even light optical wand, is used for point-source of light is become uniform area light source, and incides on the Digital Micromirror Device;

One Digital Micromirror Device is connected with input path, utilizes the switching characteristic of Digital Micromirror Device, control luminous flux and realize to output light accurate control;

One system, control circuit is connected with LASER Light Source and Digital Micromirror Device, regulates the brightness of original light source, and Digital Micromirror Device is controlled, and makes LASER Light Source that a constant output be arranged;

One optical-electrical converter is connected with system, control circuit, be used for to realize the conversion of analog signal to the conversion of digital signal and light signal to analog electrical signal;

One emitting light path is connected with optical-electrical converter, realizes area source to the conversion of point-source of light, and output;

Another even light optical wand is connected with emitting light path, output uniform light spots light source;

One PC is connected by USB with system, control circuit, is used for the input instruction.

Described system, control circuit comprises microprocessor, FPGA device, reset circuit (DAD2000) and warning circuit, and the MCU microprocessor is connected with FPGA by data/address bus, and warning circuit is connected with microprocessor, and DAD2000 provides reset signal.

Compared with prior art, the beneficial effects of the utility model are:

1, it is highly sensitive that the utility model produces the adjusting of the laser intensity obtain, and the degree of regulation of the LASER Light Source that obtains can reach 2,000,000/.

2, by the complete warning scheme of accurate closed-loop control and system to output light source, so that the LASER Light Source intensity precision that this system produces is high, system stability is reliable.

Description of drawings

Fig. 1 is the utility model structured flowchart;

Fig. 2 is the utility model control section schematic diagram:

Fig. 3 is the utility model Digital Micromirror Device course of work schematic diagram:

Fig. 4 is that 3 * 3 Digital Micromirror Device arrays are regulated bright intensity process schematic diagram:

Fig. 5 is that the even light optical wand of the utility model turns the area source schematic diagram with point-source of light:

Fig. 6 is workflow diagram of the present utility model.

Embodiment

Consult Fig. 1, the utility model is by LASER Light Source 1, all light optical wand 2, input path 3, Digital Micromirror Device 4, system, control circuit 6, optical-electrical converter 7, emitting light path 8 and PC 9 form, the utility model original laser point-source of light utilizes the LED Laser Devices to produce, and realizes that through the even light action of even light optical wand 2 point-source of light is to the conversion of rectangular uniform area source.After this rectangular uniform area source process input path internal optics processing and light path are adjusted, incide on the Digital Micromirror Device 4, utilize the reflective characteristic of digital micro-mirror array, regeneration obtains heterogeneous radiant.This regeneration light source through Digital Micromirror Device 4 passes through an emitting light path 8, obtains the output of uniform light spots light source by even light optical wand 5 at last.

Consult Fig. 2, control section of the present utility model comprises MCU(STM32V107), FPGA(EP3C120F780C7), reset circuit (DAD2000), warning circuit, optical-electrical converter and PC.MCU receives the command signal of holding from PC by USB interface, decoded rear each parts of giving respectively system of this command signal comprise lasing light emitter and FPGA, and the corresponding state of each parts is turned back to PC.The part of command signal is as the output intensity size of MCU control LASER Light Source; Another part is sent to FPGA by the data/address bus between MCU and the FPGA with this command signal, is used for the LVDS signal of the driving Digital Micromirror Device of control FPGA generation, thereby realizes the control to Digital Micromirror Device (DMD).Power supply and the reset signal of Digital Micromirror Device (DMD) are provided by the DAD2000 device.Detect in real time the size of output light intensity by optical-electrical converter, light intensity value is fed back to (MCU) of system, control circuit, MCU can do corresponding adjustment to the luminous intensity of output according to this value, forms a closed-loop control system, guarantees that output light intensity accurately controls.Warning circuit is for detection of the operating state of system, as occurs unusually namely reporting to the police.

Consult Fig. 3, Fig. 3 is the micro mirror reverberation process of Digital Micromirror Device.Micro mirror among the figure on the A representative digit micro mirror element, every a slice micro mirror of Digital Micromirror Device can by control to two different direction upsets, be respectively " opening ", "Off" state.Incide the incident direction of the light on the Digital Micromirror Device by accurate control, realize the accurate control to micro mirror reverberation direction.When micro mirror element was in "Off" state, most of incident ray was reflected to a light absorption face, and a little light as the luminous intensity sample, does not namely have light to be reflected away as the incident light source of optical-electrical converter this moment; When micro mirror element was in "On" state, incident light was reflected away, supplied with output light path and processed.

Consult Fig. 4, Fig. 4 is that 3 * 3 digital micro-mirror arrays are regulated bright intensity process signal.When 9 micro mirrors all are in "open" state, all incident lights all are reflected to output light path; Any 3 micro mirrors in 9 micro mirrors are in "off" state, only have 6/9 light to be reflected away, namely only have 6/9 luminous flux; Any 8 micro mirrors in 9 micro mirrors are in "off" state, only have 1/9 light to be reflected away, namely only have 1/9 luminous flux.The utility model is exactly the fine adjustment of realizing luminous intensity by this specific character of Digital Micromirror Device.

Consult Fig. 5, Fig. 5 turns the area source signal for even light optical wand with point-source of light, and point-source of light is by the area source of even light optical wand output uniform strength.

Consult Fig. 6, after system powered on, whole system powered up, and MCU device STM32V107 at first carries out initialize routine, comprised the setting of incident LASER Light Source intensity level, output light source intensity level initialization setting, the setting of USB interface parameter; The warning circuit parameter arranges on the plate; Then carry out the various parts self check, light path system detects detections such as () incident angle of light, the self check of FPGA circuit, usb function self check, Output of laser strength checking (should be 0), alarm start-up prompting sound, if find some parts or a plurality of unit exception, then wait for manual intervention (checking that each parts connects) and again carry out self-check program, abnormality is not still removed then and is reported to the police by USB control centre; Carry out running parameter if abnormality disappears and load, comprise start-up course parameter, Output of laser intensity of light source parameter, operating time parameter etc.; This moment, FPGA drove Digital Micromirror Device work according to the output light source intensity of required realization, then, optical-electrical converter sample detecting output light source intensity, this intensity level is read by MCU, compares with set point, and the intensity of adjustment incident laser light source, until the intensity level that sampling obtains reaches set point, if through repeatedly (5 times) adjustment, still do not reach speed setting value, close the incident laser light source, and audible alarm and send alarm signal to PC end by USB onboard.If the output light intensity value has reached set point, then system stability work enters and waits for that the PC end is written into the parameters state again.At the system stability duration of work, system works is in following process:

A), PC end setup parameter value;

B), FPGA adjusts the Digital Micromirror Device operating state;

C), optical-electrical converter detects output light source intensity;

D), MCU relatively detects light intensity value and set point;

E), MCU adjusts the incident laser intensity of light source.

Claims

1. one kind based on the accurate adjustable laser source system of Digital Micromirror Device luminous intensity, it is characterized in that this system comprises:

One LASER Light Source (1) is for generation of original light source;

One even light optical wand (2) is connected with LASER Light Source (1);

One input path (3) is connected with even light optical wand (2), is used for point-source of light is become uniform area light source, and incides on the Digital Micromirror Device;

One Digital Micromirror Device (4) is connected with input path (3), utilizes the switching characteristic of Digital Micromirror Device, control luminous flux and realize to output light accurate control;

One system, control circuit (6) is connected with LASER Light Source (1) and Digital Micromirror Device (4), regulates the brightness of original light source, and Digital Micromirror Device (4) is controlled, and makes LASER Light Source that a constant output be arranged;

One optical-electrical converter (7) is connected with system, control circuit (6), be used for to realize the conversion of analog signal to the conversion of digital signal and light signal to analog electrical signal;

One emitting light path (8) is connected with optical-electrical converter (7), realizes area source to the conversion of point-source of light, and output;

Another even light optical wand (5) is connected with emitting light path (8), output uniform light spots light source;

One PC (9) is connected by USB with system, control circuit (6), is used for the input instruction.

2. system according to claim 1, it is characterized in that described system, control circuit (6) comprises microprocessor, FPGA device, reset circuit and warning circuit, microprocessor is connected with the FPGA device by data/address bus, warning circuit is connected with microprocessor, and reset circuit provides reset signal.