CN106370300B - A kind of adjustable Photodetection system drive circuit of sensitivity - Google Patents
A kind of adjustable Photodetection system drive circuit of sensitivity Download PDFInfo
- Publication number
- CN106370300B CN106370300B CN201610891137.XA CN201610891137A CN106370300B CN 106370300 B CN106370300 B CN 106370300B CN 201610891137 A CN201610891137 A CN 201610891137A CN 106370300 B CN106370300 B CN 106370300B
- Authority
- CN
- China
- Prior art keywords
- light source
- photodetector
- adjustable
- drive circuit
- variable resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000035945 sensitivity Effects 0.000 title claims abstract description 22
- 239000006096 absorbing agent Substances 0.000 claims abstract description 12
- 230000037361 pathway Effects 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 239000004065 semiconductor Substances 0.000 claims description 2
- 238000005286 illumination Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
Abstract
A kind of adjustable Photodetection system drive circuit of sensitivity, including the first light source (1) and secondary light source (3) being connected in parallel, first light source (1) therein and secondary light source (3) are identical device, wherein variable resistor (2) is connected with the first light source (1), and variable resistor (2) is in parallel with secondary light source (3) progress with the series circuit that the first light source (1) forms；Also include photodetector (5) and electric switch (6), the direction of illumination that wherein the first light source (1) sends light with secondary light source (3) all points to photodetector (5), saturable absorber (4) is provided between the first light source (1), secondary light source (3) and photodetector (5), electric switch (6) is arranged on the first light source (1) and on the series circuit of variable resistor (2) composition, the control terminal of electric switch (6) is connected to photodetector (5).
Description
Technical field
The present invention relates to a kind of device of photodetector type, belong to photoelectron technical field.
Background technology
Existing Photodetection system typically all includes luminescent device, such as LD or LED etc., in addition to photodetector,
Namely generally described PD.Optocoupler of the prior art is exactly such a typical device.General is exactly when luminescent device is sent out
After light extraction, photodetector will produce electric signal after receiving the light that luminescent device is sent, but due to environmental factor, pass
The influence of the influence, particularly device aging etc. of inducement element and device itself sensitivity etc., light is sent even in luminescent device
In the case of strong identical, photodetector it is possible that two kinds of situations, a kind of situation are that photodetector can produce photoelectric current,
A kind of situation is that photodetector will not produce photoelectric current, and can produce photoelectric current and the sensitivity of the system has relation,
Under different scenes, it may be desired to different sensitivity, but this sensitivity is uncontrollable in the prior art, and with
The passage of time, universal law be sensitivity worse and worse, and the present invention aiming at such case, propose that a kind of sensitivity can
The drive circuit of the Photodetection system of control, adjustable sensitivity can be achieved using the drive circuit.
The content of the invention
According to one embodiment of the invention, there is provided a kind of adjustable Photodetection system drive circuit of sensitivity, its
It is characterised by：Including the first light source (1) and secondary light source (3) being connected in parallel, the first light source (1) therein and secondary light source
(3) it is identical device, wherein variable resistor (2) is connected with the first light source (1), and variable resistor (2) forms with the first light source (1)
Series circuit it is in parallel with secondary light source (3) progress；Also include photodetector (5) and electric switch (6), wherein the first light source
(1) direction of illumination that light is sent with secondary light source (3) all points to photodetector (5), in the first light source (1), secondary light source (3)
Saturable absorber (4) is provided between photodetector (5), electric switch (6) is arranged on the first light source (1) and variable resistor
(2) on the series circuit of composition, the control terminal of electric switch (6) is connected to photodetector (5).
According to one embodiment of the invention, first light source (1) and secondary light source (3) are LD or LED.
According to one embodiment of the invention, the photodetector is semiconductor PD.
According to one embodiment of the invention, change the spirit of Photodetection system by adjusting the resistance of variable resistor (2)
Sensitivity.
It is i.e. disconnected after electric switch (6) receives the electric signal from photodetector (5) according to one embodiment of the invention
Open the electric pathway of variable resistor (2) and the first light source (1) series circuit.
According to one embodiment of the invention, the light that the first light source (1) and secondary light source (3) are sent needs to inhale by saturable
Acceptor (4) gets to photodetector (5).
Brief description of the drawings
Accompanying drawing 1 is the Photodetection system driving circuit structure figure of the present invention.
In above-mentioned figure, 1 represents the first light source, and 2 represent variable resistor, and 3 represent secondary light source, and 4 represent saturable absorption
Body, 5 represent photodetector, and 6 represent electric switch.
Embodiment
The adjustable Photodetection system of sensitivity of the present invention will be described in detail on the basis of with reference to accompanying drawing below
Drive circuit.The drive circuit of the present invention includes the first light source (1) and secondary light source (3) that are connected in parallel, and therein first
Light source (1) and secondary light source (3) are identical device, such as can use LD or LED, as long as both are property identical device
Part, wherein variable resistor (2) are connected with the first light source (1), the series electrical of variable resistor (2) and the first light source (1) composition
Road is in parallel with secondary light source (3) progress.The resistance of variable resistor (2) can manually be adjusted.Also include photodetector (5),
The direction of illumination that wherein the first light source (1) sends light with secondary light source (3) all points to photodetector (5), namely the first light source
(1) and secondary light source (3) is not if the light sent is irradiated to photodetection mainly by extra influence, its main light energy
On device (5), saturable absorber (4) is provided between the first light source (1), secondary light source (3) and photodetector (5).Together
When, it is additionally provided with electric switch (6), the control terminal of electric switch on the series circuit of the first light source (1) and variable resistor (2) composition
It is a kind of absorption saturable material of light energy to be connected to photodetector (5) wherein saturable absorbers, and the material belongs to this
Technology known to field, is no longer repeated herein.Wherein the example of electric switch can be triode.
During the drive circuit works, the series circuit and the second light of the first light source (1) and variable resistor (2) composition
Source (3) carries out parallel connection, and both receive the driving of same drive signal, because the first light source (1) and variable resistor (2) constitute string
Join circuit, so by adjusting the i.e. adjustable voltage for being applied to the first light source (1) both ends of resistance of variable resistor (actually
Electric current is adjusted by adjusting the resistance on the branch road), by the first light source (1) and secondary light source (3) if the light sent does not have
Saturable absorber is set, can be shone directly on photodetector (5), we add one before photodetector (5)
The light that individual saturable absorber, the first light source (1) and secondary light source (3) are sent needs to get to light by saturable absorber
Electric explorer (5), then when the light intensity that the first light source (1) and secondary light source (3) are sent is smaller, saturable absorber (4) is no
Saturation can be reached, so now photodetector can not just experience the light that secondary light source (3) is sent, when the first light source (1) and
It will become transparent when the light intensity that secondary light source (3) is sent is sufficiently strong, when saturable absorber saturation, secondary light source (3) hair
The light gone out will be irradiated to photodetector (5), and photodetector (5) can produce electric signal after receiving light, and electric signal is anti-
The control terminal of electric switch is fed to, so that the circuit on the branch road disconnects, so that the first light source (1) is no longer luminous, this
Sample, photodetector (5) only receive the light that secondary light source (3) is sent, and do not interfere with the testing result of photodetector thus.
So, the luminous quantity of the first light source (1) is can control by adjusting the resistance of variable resistor (2), can so as to can control
Saturated absorbing body (4) reaches saturable degree, and the speed of the saturable speed of saturable absorber (4) just determines the light
The sensitiveness of electrical resistivity survey examining system, it is lower that saturable absorber (4) is less susceptible to saturation its sensitivity, on the contrary then higher.
The sensitivity of Photodetection system can be arbitrarily adjusted by this simple control mode, is solved well existing
The problem of having in the presence of technology.
Claims (6)
- A kind of 1. adjustable Photodetection system drive circuit of sensitivity, it is characterised in that：Including be connected in parallel first Light source (1) and secondary light source (3), the first light source (1) therein and secondary light source (3) are identical device, wherein variable resistor (2) connected with the first light source (1), the series circuit of variable resistor (2) and the first light source (1) composition is carried out with secondary light source (3) It is in parallel；Also include photodetector (5) and electric switch (6), wherein the first light source (1) sends the irradiation of light with secondary light source (3) Direction all points to photodetector (5), and being provided between the first light source (1), secondary light source (3) and photodetector (5) can Saturated absorbing body (4), electric switch (6) are arranged on the series circuit that the first light source (1) forms with variable resistor (2), electric switch (6) control terminal is connected to photodetector (5), and the electric switch (6) is triode.
- 2. the adjustable Photodetection system drive circuit of sensitivity according to claim 1, it is characterised in that：Described One light source (1) and secondary light source (3) are LD or LED.
- 3. the adjustable Photodetection system drive circuit of sensitivity according to claim 1, it is characterised in that：The light Electric explorer is semiconductor PD.
- 4. the adjustable Photodetection system drive circuit of sensitivity according to claim 1, it is characterised in that：Pass through tune The resistance of section variable resistor (2) changes the sensitivity of Photodetection system.
- 5. the adjustable Photodetection system drive circuit of sensitivity according to claim 1, it is characterised in that：When establishing by cable Close after (6) receive the electric signal from photodetector (5) and disconnect variable resistor (2) and the first light source (1) series circuit Electric pathway.
- 6. the adjustable Photodetection system drive circuit of sensitivity according to claim 1, it is characterised in that：First light The light that source (1) and secondary light source (3) are sent needs to get to photodetector (5) by saturable absorber (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610891137.XA CN106370300B (en) | 2016-10-13 | 2016-10-13 | A kind of adjustable Photodetection system drive circuit of sensitivity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610891137.XA CN106370300B (en) | 2016-10-13 | 2016-10-13 | A kind of adjustable Photodetection system drive circuit of sensitivity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106370300A CN106370300A (en) | 2017-02-01 |
| CN106370300B true CN106370300B (en) | 2018-01-19 |
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ID=57895701
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610891137.XA Expired - Fee Related CN106370300B (en) | 2016-10-13 | 2016-10-13 | A kind of adjustable Photodetection system drive circuit of sensitivity |
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| Country | Link |
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| CN (1) | CN106370300B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW513468B (en) * | 2001-06-14 | 2002-12-11 | Nation Tsing Hua University | Optical limiting applications on phthalocyanines |
| CN1571941A (en) * | 2001-10-18 | 2005-01-26 | 独立行政法人产业技术综合研究所 | Optical element, and manufacturing method thereof |
| CN101375152A (en) * | 2006-01-20 | 2009-02-25 | 住友电气工业株式会社 | Optical measuring apparatus and wide-band light source device adaptable to same |
| CN206095428U (en) * | 2016-10-14 | 2017-04-12 | 华北电力大学（保定） | Photodetection system drive circuit with adjustable sensitivity |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000244058A (en) * | 1999-02-18 | 2000-09-08 | Sony Corp | Semiconductor laser and its manufacture |
-
2016
- 2016-10-13 CN CN201610891137.XA patent/CN106370300B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW513468B (en) * | 2001-06-14 | 2002-12-11 | Nation Tsing Hua University | Optical limiting applications on phthalocyanines |
| CN1571941A (en) * | 2001-10-18 | 2005-01-26 | 独立行政法人产业技术综合研究所 | Optical element, and manufacturing method thereof |
| CN101375152A (en) * | 2006-01-20 | 2009-02-25 | 住友电气工业株式会社 | Optical measuring apparatus and wide-band light source device adaptable to same |
| CN206095428U (en) * | 2016-10-14 | 2017-04-12 | 华北电力大学（保定） | Photodetection system drive circuit with adjustable sensitivity |
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| Publication number | Publication date |
|---|---|
| CN106370300A (en) | 2017-02-01 |
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Granted publication date: 20180119 Termination date: 20211013 |