CN214315676U - Standard light source - Google Patents
Standard light source Download PDFInfo
- Publication number
- CN214315676U CN214315676U CN202120346517.1U CN202120346517U CN214315676U CN 214315676 U CN214315676 U CN 214315676U CN 202120346517 U CN202120346517 U CN 202120346517U CN 214315676 U CN214315676 U CN 214315676U
- Authority
- CN
- China
- Prior art keywords
- module
- light
- input end
- emitting diode
- light source
- 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.)
- Active
Links
Images
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The application discloses a standard light source, which comprises a first amplification module, a second amplification module, a differential proportion operation module, a driving control module, a light detection module, a light emitting diode and a photosensitive sensor, wherein a differential input end of the first amplification module receives a voltage set value, and a common-mode input end is connected with a reference voltage source; the first input end and the second input end of the differential proportion operation module are respectively connected with the output end of the first amplification module and the output end of the optical detection module; the light detection module has an inverting input terminal connected to the photosensitive sensor and a non-inverting input terminal connected to a reference voltage source. Reference voltage source has all been connected to first amplifier module and light detection module in this application, and reference voltage source's existence has improved the voltage of the static operating point of system, makes the voltage signal amplitude of every point all great, avoids the great phenomenon of noise to appear when each components and parts are low-voltage, and the interference killing feature of circuit improves, has especially guaranteed the good performance of faint light output.
Description
Technical Field
The utility model relates to a weak light detects the field, in particular to standard light source.
Background
The photon technologist is a weak light detecting instrument, and the photomultiplier is a key component. In order to make the photomultiplier work correctly, a standard light source with stable luminous intensity is required to be provided as a reference calibration of the photomultiplier.
There are some designs of standard light sources in the prior art, such as the standard light sources disclosed in patent CN 105246190 a and patent CN 107343342A, which generally include an input module, a feedback control module, a light emitting diode and a detection module. However, the output of these standard light sources is not stable enough, and especially in weak light output, the circuit noise is large, and the light emitting diode cannot accurately output a stable light source.
Therefore, how to provide a solution to the above technical problems is a problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides a standard light source to output stable and accurate light source under various conditions. The specific scheme is as follows:
the utility model provides a standard light source, includes first amplification module, second amplification module, difference proportion operation module, drive control module, light detection module, emitting diode and photosensitive sensor, wherein:
the differential input end of the first amplification module receives a voltage setting value, and the common-mode input end is connected with a reference voltage source;
the first input end and the second input end of the differential proportion operation module are respectively connected with the output end of the first amplification module and the output end of the optical detection module;
the first input end and the second input end of the driving control module are respectively connected with the output end of the differential proportion operation module and the output end of the second amplification module;
the output end of the drive control module is connected with the light emitting diode so as to drive the light emitting diode;
the second amplification module samples the current of the light emitting diode;
the photosensitive sensor correspondingly generates a photoelectric signal according to the luminous intensity of the light-emitting diode;
and the inverting input end of the light detection module is connected with the photosensitive sensor, and the normal phase input end of the light detection module is connected with the reference voltage source.
Preferably, the standard light source further comprises:
and the neutral density filter is positioned between the light-emitting diode and the photomultiplier.
Preferably, the photosensitive sensor and the light emitting diode are located on the same side of the neutral density filter.
Preferably, the optical detection module includes a TIA circuit and a first resistance matching circuit with adjustable resistance;
the second amplification module comprises an amplifier and a second resistance matching circuit with adjustable resistance.
Preferably, the first resistance matching circuit comprises a plurality of first resistance switching units connected in parallel, each of the first resistance switching units comprises a first switch and a first resistance connected in series;
the second resistance matching circuit comprises a plurality of second resistance switching units connected in parallel, and each second resistance switching unit comprises a second switch and a second resistance which are connected in series.
Preferably, the standard light source further comprises:
receiving the MCU of the voltage setting value through a computer;
and the input end of the digital-to-analog converter is connected with the output end of the MCU, and the output end of the digital-to-analog converter is connected with the differential input end of the first amplification module.
Preferably, the standard light source further comprises:
and the state detection module is used for sampling the current of the light emitting diode and the photosensitive sensor and sending the current to a computer.
Preferably, the photosensitive sensor is a photodiode.
Preferably, the driving control module is specifically a constant current driving control module.
Preferably, the standard light source further comprises a light-shading shell provided with a light through hole, the first amplification module, the second amplification module, the differential proportion operation module, the driving control module, the light detection module, the light emitting diode and the photosensitive sensor are all arranged inside the light-shading shell, and the light emitting diode irradiates the photomultiplier through the light through hole.
The application discloses standard light source, including first amplification module, second amplification module, difference proportion operation module, drive control module, light detection module, emitting diode and photosensitive sensor, wherein: the differential input end of the first amplification module receives a voltage setting value, and the common-mode input end is connected with a reference voltage source; the first input end and the second input end of the differential proportion operation module are respectively connected with the output end of the first amplification module and the output end of the optical detection module; the first input end and the second input end of the driving control module are respectively connected with the output end of the differential proportion operation module and the output end of the second amplification module; the output end of the drive control module is connected with the light emitting diode so as to drive the light emitting diode; the second amplification module samples the current of the light emitting diode; the photosensitive sensor correspondingly generates a photoelectric signal according to the luminous intensity of the light-emitting diode; and the inverting input end of the light detection module is connected with the photosensitive sensor, and the normal phase input end of the light detection module is connected with the reference voltage source. Reference voltage source has all been connected to first amplifier module and light detection module in this application, and reference voltage source's existence has improved the voltage of the static operating point of system, makes the voltage signal amplitude of every point all great, avoids the great phenomenon of noise to appear when each components and parts are low-voltage, and the interference killing feature of circuit improves, has especially guaranteed the good performance of faint light output.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a structural distribution diagram of a standard light source according to an embodiment of the present invention;
fig. 2 is a structural distribution diagram of a specific standard light source according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the prior art, there are some standard light source designs, such as the standard light sources disclosed in patent CN 105246190 a and patent CN 107343342A, the output of the standard light source is not stable enough, especially when weak light is output, the circuit noise is large, and the light emitting diode cannot accurately output a stable light source.
Reference voltage source has all been connected to first amplifier module and light detection module in this application, and reference voltage source's existence has improved the voltage of the static operating point of system, makes the voltage signal amplitude of every point all great, avoids the great phenomenon of noise to appear when each components and parts are low-voltage, and the interference killing feature of circuit improves, has especially guaranteed the good performance of faint light output.
The embodiment of the utility model discloses standard light source, it is shown with reference to fig. 1, amplify module 2, difference proportion operation module 3, drive control module 4, light detection module 5, emitting diode LED and photosensitive sensor 6 including first amplification module 1, second, wherein:
the differential input end of the first amplification module 1 receives a voltage setting value, and the common-mode input end is connected with a reference voltage source REF;
a first input end and a second input end of the differential proportion operation module 3 are respectively connected with an output end of the first amplification module 1 and an output end of the optical detection module 5;
a first input end and a second input end of the driving control module 4 are respectively connected with an output end of the differential proportion operation module 3 and an output end of the second amplification module 2;
the output end of the drive control module 4 is connected with the light emitting diode LED to drive the light emitting diode LED;
the second amplification module 2 samples the current of the light emitting diode LED;
the photosensitive sensor 6 correspondingly generates a photoelectric signal according to the luminous intensity of the light emitting diode LED;
the light detection module 5 has an inverting input terminal connected to the photosensor 6 and a non-inverting input terminal connected to the reference voltage source REF.
It will be appreciated that, as shown in fig. 1, the first amplification block 1 is embodied as an amplifier, which is designated U1; similarly, the second amplification block 2 comprises an amplifier and associated matching circuit, the amplifier being labelled U2; the differential proportion operation module 3 comprises a differential proportion operational amplifier U3 and a relevant matching circuit; the driving control module 4 is used for driving the light emitting diode LED, which is marked as U4 in the figure, and specifically, a constant current driving control module can be selected, so that the response speed of the whole standard light source can be improved; the optical detection module 5 may specifically include a TIA (Trans-Impedance Amplifier) circuit U5 and a related matching circuit, where the TIA circuit U5 converts an optical-electrical signal in the form of current into a voltage value; the light sensor 6 is used for generating corresponding electric signals according to the luminous intensity of the light emitting diode LED, and therefore the light sensitive diode can be selected specifically.
The work flow of the whole standard light source comprises the following contents: the differential input end of the first amplification module 1 receives a voltage setting value, and the voltage setting value determines the light intensity of the whole standard light source; the light detection module 5 receives a photoelectric signal generated by the photosensitive sensor 6; the difference proportion operation module 3 receives and processes signals output by the first amplification module 1 and the light detection module 5 at the same time; the second amplification module 2 samples the current of the light emitting diode LED and outputs an electric signal related to the current; the driving control module 4 receives the output signals of the differential proportion operation module 3 and the second amplification module 2 at the same time, and outputs a driving signal for driving the light emitting diode LED. The process comprises two feedback loops, wherein firstly, the light detection module 5 feeds back to an outer loop of the proportion difference operation module 3, the feedback takes the light intensity change of the light emitting diode LED as a feedback basis, and can effectively inhibit the light intensity fluctuation of the light emitting diode LED, the light intensity fluctuation can be caused by voltage fluctuation, temperature fluctuation or aging of the light emitting diode LED device, and can be inhibited through the outer loop feedback, so that the light intensity stability of the light emitting diode LED is ensured; and the second is the feedback from the second amplification module 2 to the inner ring of the driving control module 4, the feedback takes the current change of the light emitting diode LED as the feedback basis, the stability of the electric signal for driving the light emitting diode LED is ensured, the current fluctuation of the light emitting diode LED is inhibited, and the stable light intensity corresponding to the voltage setting value is obtained.
It should be noted that, when the standard light source is required to output weak light, the voltage setting value and the voltage value output by the light detection module 5 are small, and the influence of circuit noise and zero drift on the stability of the standard light source must be considered. In the embodiment, the first amplification module 1 and the light detection module 5 are both connected with a reference voltage source REF, and the existence of the reference voltage source REF improves the static working point voltage of the system and ensures that the standard light source has good performance in weak light output. For example, in fig. 1, when the voltage setting value is 0V, the actual common mode voltage of the first amplification module 1 is half of the voltage of the reference voltage source REF, the output voltage value of the amplifier U1 is the same as the reference voltage source REF, when the voltage setting value is not 0, one of the two paths increases, the other decreases, the differential mode voltage thereof is the voltage setting value, and the output value of the amplifier U1 is the sum of the voltage setting value and the voltage of the reference voltage source REF; the photo detection module 5 uses a TIA circuit to convert the photoelectric signal into a voltage value, and the non-inverting input terminal of the photo detection module is connected with a reference voltage source REF, so that the output voltage of the photo detection module 5 is the sum of the converted voltage value and the voltage of the reference voltage source REF; when the output ends of the first amplifying module 1 and the light detection module 5 are both connected to the differential proportion operation module 3, the differential proportion operation module 3 outputs the difference value of the two, and the voltage value of the reference voltage source REF is offset. The voltage signal of each point in the process has larger amplitude, the static working voltage point of the system is improved, and the anti-interference capability of the circuit is obviously improved.
Further, considering that the standard light source is applied to the photomultiplier, the photomultiplier requires a wide measurable range in practical application, and usually needs to cover 102To 109Therefore, the standard light source should have a wide variation range, and considering the requirements of output precision and stability, a multi-step adjusting circuit can be selected, specifically:
the optical detection module 5 comprises a TIA circuit and a first resistance matching circuit with adjustable resistance.
The second amplification module 2 comprises an amplifier and a second resistance matching circuit with adjustable resistance.
Further, the resistance adjustable form of the first resistance matching circuit and the second resistance matching circuit may be an adjustable resistance unit, or a form in which a single-pole multi-throw switch shown in fig. 1 is connected to a plurality of selectable resistors, or a form in which a plurality of resistance switching units are connected in parallel, specifically, the first resistance matching circuit includes a plurality of first resistance switching units connected in parallel, each first resistance switching unit includes a first switch and a first resistor connected in series; the second resistance matching circuit includes a plurality of second resistance switching units connected in parallel, each of the second resistance switching units including a second resistance of the second switch connected in series.
Reference voltage source has all been connected to first amplifier module and light detection module in this application, and reference voltage source's existence has improved the voltage of the static operating point of system, makes the voltage signal amplitude of every point all great, avoids the great phenomenon of noise to appear when each components and parts are low-voltage, and the interference killing feature of circuit improves, has especially guaranteed the good performance of faint light output.
The embodiment of the utility model discloses specific standard light source, for last embodiment, further explanation and optimization have been made to technical scheme to this embodiment. Specifically, referring to fig. 2, the standard light source further includes:
a neutral density filter 7 located between the light emitting diode LED and the photomultiplier tube PMT.
It can be understood that, the neutral density filter 7 attenuates the light intensity, when the light intensity irradiated to the photomultiplier tube PMT is not changed, the stability and the accuracy of the standard light source with the neutral density filter 7 are obviously higher, for example, a 0D2.0 neutral density filter is adopted, the light intensity of the light emitting diode LED can be reduced to 1% of the original light intensity, at the moment, the adjustment target of the inside of the standard light source to the light emitting diode LED is 100 times of the received light intensity of the photomultiplier tube PMT, the inside of the standard light source is easier to adjust, meanwhile, the signal-to-noise ratio of the circuit is improved, and the fluctuation of the light source is reduced.
Further, the photosensitive sensor 6 and the light emitting diode LED are located on the same side of the neutral density filter 7.
It will be appreciated that this arrangement reduces process complexity while making the space inside the standard light source more compact.
Further, the standard light source conventionally further includes:
the MCU 8 for receiving the voltage setting value through the computer;
and the input end of the digital-to-analog converter 9 is connected with the output end of the MCU 8, and the output end of the digital-to-analog converter is connected with the differential input end of the first amplification module 1.
It is understood that the MCU 8 can also be implemented by other programmable logic modules, and the digital-to-analog converter 9 can be replaced by an adjustable potentiometer, which is not limited herein. In addition, an analog-to-digital converter ADC is usually provided to accommodate the MCU.
Further, the standard light source may further include:
the current is sampled to the LED and the photosensor 6 and sent to the state detection module 10 of the computer.
Specifically, the state detection module 10 can reflect the current and voltage conditions inside the standard light source, and the computer can determine the working state of the standard light source, perform performance testing and function diagnosis after receiving the current and voltage conditions.
Further, the standard light source further comprises a light-shading shell provided with a light through hole, the first amplification module 1, the second amplification module 2, the differential proportion operation module 3, the driving control module 4, the light detection module 5, the light emitting diode LED and the photosensitive sensor 6 are all arranged inside the light-shading shell, and the light emitting diode LED irradiates the photomultiplier PMT through the light through hole.
It can be understood that the light-shielding shell can reduce the interference of the external environment to the light source and improve the stability of the standard light source.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, scheme, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, scheme, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, scheme, article or apparatus that comprises the element.
The above detailed description is made on a standard light source provided by the present invention, and the principle and the implementation of the present invention are explained by applying a specific example, and the description of the above example is only used to help understanding the scheme and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
Claims (10)
1. The standard light source is characterized by comprising a first amplification module, a second amplification module, a differential proportion operation module, a drive control module, a light detection module, a light emitting diode and a photosensitive sensor, wherein:
the differential input end of the first amplification module receives a voltage setting value, and the common-mode input end is connected with a reference voltage source;
the first input end and the second input end of the differential proportion operation module are respectively connected with the output end of the first amplification module and the output end of the optical detection module;
the first input end and the second input end of the driving control module are respectively connected with the output end of the differential proportion operation module and the output end of the second amplification module;
the output end of the drive control module is connected with the light emitting diode so as to drive the light emitting diode;
the second amplification module samples the current of the light emitting diode;
the photosensitive sensor correspondingly generates a photoelectric signal according to the luminous intensity of the light-emitting diode;
and the inverting input end of the light detection module is connected with the photosensitive sensor, and the normal phase input end of the light detection module is connected with the reference voltage source.
2. The standard light source of claim 1, further comprising:
and the neutral density filter is positioned between the light-emitting diode and the photomultiplier.
3. The standard light source of claim 2, wherein the photosensor and the led are located on the same side of the neutral density filter.
4. The standard light source of claim 1,
the optical detection module comprises a TIA circuit and a first resistance matching circuit with adjustable resistance;
the second amplification module comprises an amplifier and a second resistance matching circuit with adjustable resistance.
5. The standard light source of claim 4, wherein the first resistance matching circuit comprises a plurality of first resistance switching units connected in parallel, each of the first resistance switching units comprising a first switch and a first resistance connected in series;
the second resistance matching circuit comprises a plurality of second resistance switching units connected in parallel, and each second resistance switching unit comprises a second switch and a second resistance which are connected in series.
6. The standard light source of claim 1, further comprising:
receiving the MCU of the voltage setting value through a computer;
and the input end of the digital-to-analog converter is connected with the output end of the MCU, and the output end of the digital-to-analog converter is connected with the differential input end of the first amplification module.
7. The standard light source of claim 1, further comprising:
and the state detection module is used for sampling the current of the light emitting diode and the photosensitive sensor and sending the current to a computer.
8. The standard light source of claim 1, wherein the light sensitive sensor is a light sensitive diode.
9. The standard light source of claim 1, wherein the driving control module is a constant current driving control module.
10. The standard light source of any one of claims 1 to 9, further comprising a light-shielding housing having a light-passing hole, wherein the first amplification module, the second amplification module, the differential proportional operation module, the driving control module, the light detection module, the light emitting diode and the photosensor are disposed inside the light-shielding housing, and the light emitting diode irradiates the photomultiplier through the light-passing hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120346517.1U CN214315676U (en) | 2021-02-05 | 2021-02-05 | Standard light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120346517.1U CN214315676U (en) | 2021-02-05 | 2021-02-05 | Standard light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214315676U true CN214315676U (en) | 2021-09-28 |
Family
ID=77833601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120346517.1U Active CN214315676U (en) | 2021-02-05 | 2021-02-05 | Standard light source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214315676U (en) |
-
2021
- 2021-02-05 CN CN202120346517.1U patent/CN214315676U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2142527A1 (en) | Light detector using reverse biased photodiodes with dark current compensation | |
| CN112770437A (en) | Standard light source | |
| US11262295B2 (en) | Electronic arrangement, optical gas sensor including such an electronic arrangement, and method for combined photocurrent and temperature measurement using such an electronic arrangement | |
| CN214315676U (en) | Standard light source | |
| EP1695052B1 (en) | Multiplexing rotary spectrometer | |
| KR20220014270A (en) | photodetector read-out integrated circuit | |
| TW201939013A (en) | Multi-channel detecting system | |
| US8957363B2 (en) | Differential photodiode integrator circuit for absorbance measurements | |
| CA2294188C (en) | Calibration system for a photomultiplier tube | |
| CN114487579A (en) | Current detection circuit | |
| SU1012287A1 (en) | Optoelectronic multiplier | |
| JPS6388871A (en) | Optical hybrid integrated circuit device | |
| CN220626199U (en) | Photoelectric sensor circuit for infrared gas analyzer circuit design | |
| CN218239068U (en) | Optical power monitoring circuit | |
| US20050271398A1 (en) | Photo-detector arrangement and process for the calibration thereof | |
| Patil et al. | High-gain transimpedance amplifier (TIA) for night airglow photometer | |
| SU1349671A1 (en) | Photodetector device | |
| SU775630A1 (en) | Device for measuring non-linearity of photodetector luminous sensitivity | |
| SU1112293A1 (en) | Device for measuring current | |
| CN116545390A (en) | Operational amplifier circuit and photoelectric detection system | |
| SU1589074A1 (en) | Photodetector | |
| SU834724A1 (en) | Optronic device for raising to the power | |
| SU702387A1 (en) | Optoelectronic multiplier | |
| SU752358A1 (en) | Device for transmitting analogue signals with galvanic isolation | |
| SU885058A1 (en) | Analytic device for automatic electronic engraving machines |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |