CN117848491A - Four-quadrant detector and control method thereof - Google Patents
Four-quadrant detector and control method thereof Download PDFInfo
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- CN117848491A CN117848491A CN202311829155.1A CN202311829155A CN117848491A CN 117848491 A CN117848491 A CN 117848491A CN 202311829155 A CN202311829155 A CN 202311829155A CN 117848491 A CN117848491 A CN 117848491A
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Abstract
The invention provides a four-quadrant detector, comprising: the MEMS mirror for refracting light, the MEMS mirror is connected with a drive circuit, drive circuit is connected with a detector chip, the detector chip is connected with the signal output part through signal link, the MEMS mirror drives refracting light and gets into the detector chip, the detector chip includes: four quadrant detector chips, a central photodetector, a power supply and an amplifying circuit. The four-quadrant detector is matched with the refraction light, the MEMS mirror and the driving circuit, the refraction light is adjusted in real time, the refraction light is driven to be positioned at the center of the four-quadrant detector, the resolution of the detector is improved, the detection precision is improved, and the response time is reduced.
Description
Technical Field
The invention relates to the field of detectors, in particular to a four-quadrant detector and a control method thereof.
Background
The laser positioning technology is a new technology integrating laser technology, semiconductor technology and computer technology, and the development of the technology benefits from the characteristics of high stability and high collimation of laser on one hand and the rapid development of semiconductor technology and computer technology in recent years on the other hand. The laser positioning technology is also an important component in the laser measurement technology, and is widely applied to the fields of laser measurement, laser communication, microscopic particle measurement and the like.
In the biomedical field, observation of cells and large particle proteins is generally performed using an optical microscope, and if it is necessary to move and manipulate small particles such as cells, it is necessary to use forceps.
In the biomedical field, an optical microscope is generally used for observing cells and large-particle proteins, if the cells are required to be moved and manipulated, the small particles are required to be used by using optical tweezers, but the light cannot be subjected to real-time angle adjustment in the moving and observing processes, so that the existing detector has the characteristics of low resolution, low detection precision, long response time and the like.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a four-quadrant detector, including: the MEMS mirror is used for refracting light, the MEMS mirror is connected with a driving circuit, the driving circuit is connected with a detector chip, the detector chip is connected with a signal output end through a signal link, and the MEMS mirror drives the refracted light to enter the detector chip;
the detector chip includes: four quadrant detector chips, a central photodetector, a power supply and an amplifying circuit.
Preferably, the quadrant detector chip employs a silicon-based photodetector.
Preferably, the driving circuit includes: conditioning circuitry and analog sensors.
Preferably, the receiver circuit of a detector is integrated in the center of the quadrant detector, allowing high-speed optical communication.
Preferably, a control method for a four-quadrant detector includes:
s1: the MEMS mirror drives the light to be refracted to the detector chip;
s2: judging whether the refracted light rays deviate from the center of the four-quadrant detector or not through the detector chip;
s3: when the refracted light rays deviate from the center of the four-quadrant detector, the displacement change is recorded by the analog sensor through the signal conditioning circuit and is converted into the control voltage of the MEMS mirror, the MEMS mirror is controlled to adjust the direction of the mirror, and therefore laser is controlled to be aligned with the center of the four-quadrant detector.
Preferably, when the refracted light irradiates the surface of the four-quadrant detector, if the center of the light beam is positioned at the center of the four-quadrant detector, the received light power of each quadrant is the same, and equal photocurrents are output; if the center of the light beam deviates from the center of the four-quadrant detector, the received light energy also changes due to different light spot areas on the four quadrants, so that photocurrents with different intensities are generated, the magnitude of the output current of the photodiode is related to the position of the incident light, when the light beam deviates from the center of the detector, the magnitude of the output current increases, and after the light beam deviates from the center, the projection position of the light beam on the diode changes, so that the magnitude of the photocurrent changes.
Preferably, the change of the projection position can calculate the displacement change of the light spot center relative to the center of the detector;
position conversion formula:
ex and Ey are the offsets on the x and y axes, respectively; SA, SB, SC, SD are the distribution areas of the image spots in four quadrants, respectively.
The invention has the following advantages:
1. the four-quadrant detector is matched with the refraction light, the MEMS mirror and the driving circuit, the refraction light is adjusted in real time, the refraction light is driven to be positioned at the center of the four-quadrant detector, the resolution of the detector is improved, the detection precision is improved, and the response time is reduced.
2. The photoelectric currents with different intensities are generated through different spot areas on the four quadrants, and the displacement change of the spot center relative to the detector center at the settlement position according to the photoelectric current change has independent quadrant output, strong external expansibility and the functions of spot positioning and visible light wireless communication.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below.
FIG. 1 is a schematic diagram of the operation of a four-quadrant detector in an embodiment of the present invention;
FIG. 2 is a schematic diagram of the overall structure of a four-quadrant detector according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a chip structure of a four-quadrant detector according to an embodiment of the present invention.
FIG. 4 is a chip layout of a four-quadrant detector in an embodiment of the present invention;
FIG. 5 is a chip layout of a four-quadrant detector in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The present invention will be described in further detail with reference to examples and embodiments.
As shown in fig. 1 to 5, a four-quadrant detector includes: the MEMS mirror for refracting light is connected with a drive circuit, and the drive circuit includes: conditioning circuitry and analog sensors.
The driving circuit is connected with a detector chip, and the detector chip comprises: four quadrant detector chips, a central photoelectric detector, a power supply and an amplifying circuit (diode), wherein the quadrant detector chips adopt silicon-based photoelectric detectors.
The detector chip is connected with a signal output end through a signal link, the MEMS mirror drives refraction light to enter the detector chip, the center of the quadrant detector is integrated with a receiver circuit of the detector, high-speed optical communication can be performed, and the four-quadrant detector chip can directly convert weak laser signals into current signals and output the current signals.
The control method of the four-quadrant detector comprises the following steps:
s1: the MEMS mirror drives light (laser) to be refracted on the detector chip;
s2: judging whether the refracted light rays deviate from the center of the four-quadrant detector or not through the detector chip;
when the refracted light irradiates the surface of the four-quadrant detector, if the light beam center is positioned at the center of the four-quadrant detector, the received light power of each quadrant is the same, and equal photocurrents are output;
if the beam center deviates from the center of the four-quadrant detector, the received light energy also changes due to the different light spot areas on the four quadrants, so that photocurrents with different intensities are generated;
s3: when the refracted light rays deviate from the center of the four-quadrant detector, the displacement change is recorded by the analog sensor through the signal conditioning circuit and is converted into the control voltage of the MEMS mirror, the MEMS mirror is controlled to adjust the direction of the mirror, and therefore laser is controlled to be aligned with the center of the four-quadrant detector.
When the light deviates from the center of the detector, the amplitude of the output current is increased, and after the light deviates from the center, the projection position of the light on the diode is changed, so that the magnitude of the photocurrent is changed, and photocurrents with different intensities are generated;
the magnitude of the output current of the diode is related to the position of the incident light, when the light rays deviate from the center of the detector, the magnitude of the output current is increased, and after the light rays deviate from the center, the projection position of the light rays on the diode is changed;
the magnitude of the photocurrent is changed, so that the change of the projection position can be used for calculating the displacement change of the light spot center relative to the center of the detector.
Position conversion formula:
ex and Ey are the offsets on the x and y axes, respectively; s is S A 、S B 、S C 、S D The distribution areas of the image spots in the four quadrants are respectively.
Through the signal conditioning circuit, the analog sensor records displacement change and converts the displacement change into control voltage of the MEMS mirror, and the MEMS mirror is controlled to adjust the direction of the mirror, so that the laser is controlled to be aligned with the center of the quadrant detector. The center of the quadrant detector is integrated with a receiver circuit of the detector, which can perform high-speed optical communication.
Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
Claims (7)
1. A four-quadrant detector, comprising: the MEMS mirror is used for refracting light, the MEMS mirror is connected with a driving circuit, the driving circuit is connected with a detector chip, the detector chip is connected with a signal output end through a signal link, and the MEMS mirror drives the refracted light to enter the detector chip;
the detector chip includes: four quadrant detector chips, a central photodetector, a power supply and an amplifying circuit.
2. The four-quadrant detector of claim 1, wherein the quadrant detector chip employs a silicon-based photodetector.
3. The four-quadrant detector of claim 1, wherein said drive circuit comprises: conditioning circuitry and analog sensors.
4. The four-quadrant detector of claim 1, wherein the quadrant detector is integrated with a receiver circuit of the detector for high-speed optical communication.
5. A control method for the four-quadrant detector of any one of claims 1 to 4, characterized by comprising:
s1: the MEMS mirror drives the light to be refracted to the detector chip;
s2: judging whether the refracted light rays deviate from the center of the four-quadrant detector or not through the detector chip;
s3: when the refracted light rays deviate from the center of the four-quadrant detector, the displacement change is recorded by the analog sensor through the signal conditioning circuit and is converted into the control voltage of the MEMS mirror, the MEMS mirror is controlled to adjust the direction of the mirror, and therefore laser is controlled to be aligned with the center of the four-quadrant detector.
6. The method according to claim 5, wherein when the refracted light irradiates the surface of the four-quadrant detector, if the center of the light beam is located at the center of the four-quadrant detector, the light power received by each quadrant is the same, and equal photocurrents are output; if the center of the light beam deviates from the center of the four-quadrant detector, the received light energy also changes due to different light spot areas on the four quadrants, so that photocurrents with different intensities are generated, the magnitude of the output current of the photodiode is related to the position of the incident light, when the light beam deviates from the center of the detector, the magnitude of the output current increases, and after the light beam deviates from the center, the projection position of the light beam on the diode changes, so that the magnitude of the photocurrent changes.
7. The control method of a four-quadrant detector according to claim 6, wherein the change of the projection position can calculate the change of the displacement of the center of the light spot with respect to the center of the detector;
position conversion formula:
ex and Ey are the offsets on the x and y axes, respectively; SA, SB, SC, SD are the distribution areas of the image spots in four quadrants, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311829155.1A CN117848491A (en) | 2023-12-28 | 2023-12-28 | Four-quadrant detector and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311829155.1A CN117848491A (en) | 2023-12-28 | 2023-12-28 | Four-quadrant detector and control method thereof |
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| CN117848491A true CN117848491A (en) | 2024-04-09 |
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| CN202311829155.1A Pending CN117848491A (en) | 2023-12-28 | 2023-12-28 | Four-quadrant detector and control method thereof |
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