CN2800242Y - Weak laser power meter - Google Patents
Weak laser power meter Download PDFInfo
- Publication number
- CN2800242Y CN2800242Y CN 200520102838 CN200520102838U CN2800242Y CN 2800242 Y CN2800242 Y CN 2800242Y CN 200520102838 CN200520102838 CN 200520102838 CN 200520102838 U CN200520102838 U CN 200520102838U CN 2800242 Y CN2800242 Y CN 2800242Y
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- microprocessor
- power meter
- amplifier
- photoelectric tube
- laser power
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- 238000001514 detection method Methods 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 230000003595 spectral effect Effects 0.000 abstract description 3
- 230000004043 responsiveness Effects 0.000 description 5
- 238000005375 photometry Methods 0.000 description 4
- 239000006096 absorbing agent Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 241000218606 Pinus contorta Species 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 235000000673 shore pine Nutrition 0.000 description 1
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Abstract
The utility model discloses a weak laser power meter which comprises a photoelectric tube, an amplifier, an A/D converter, a microprocessor, a keyboard and a digital tube, wherein the positive pole of the photoelectric tube is connected with an input end of the amplifier; an output end of the amplifier is connected with an I/O port of the microprocessor by the A/D converter; the keyboard is connected with a group of I/O ports of the microprocessor; the digital tube is connected with the other group of I/O ports of the microprocessor. The power meter adopts direct conversion from light signals to electric signals. The response time of detection is short, and the precision is high. The power meter can detect the weak light power from an entire near infrared zone to a near ultraviolet zone. Moreover, the utility model has the same measuring precision to measuring values in the spectral response range.
Description
Technical field
The utility model relates to power meter, especially the weak laser power meter of surveying weak laser power.
Background technology
Vertical institute is known, is to be electric signal with light signal by certain formal transformation about the measurement of luminous power, by the size of electric signal light intensity as can be known.Most light power meter is to measure by the form of light one a hot electricity, this class detector is that luminous energy is converted into heat energy, be converted into electric signal again with sensitive thermopair then, its advantage is basic identical to the photoresponse rate of different wave length, but detection sensitivity is low, is commonly used to measure stronger light source.Another kind of is direct conversion between light and the electricity, from its mechanism, can accomplish single photon detection.Its core is light probe and signal processing system.Light probe is a solid state photodiode.According to photoelectric effect, each frequency can be pulled the trigger out photoelectron greater than the photon of material for detector cutoff frequency, and luminous energy is converted into electric energy, the detection sensitivity height.But present light-electrodymamometer is to the responsiveness difference of the light of different wave length, it is the wavelength difference, two incident lights that photon number is identical are different with the photoelectron number of being pulled the trigger out, and high-precision light power meter therefore commonly used all is at the light of specific wavelength.
Summary of the invention
The purpose of this utility model is that one of design can be measured visible light and any wavelength of near-infrared band, and with the weak laser power meter of digital form output power.
The technical scheme that its technical matters that solves the utility model adopts is: the weak laser power meter comprises photoelectric tube, amplifier, A/D converter, microprocessor, keyboard and charactron, the positive pole of photoelectric tube links to each other with amplifier input terminal, and the output terminal of amplifier links to each other with an I/O mouth of microprocessor through A/D converter, keyboard links to each other with one group of I/O mouth of microprocessor, and charactron links to each other with another group I/O mouth of microprocessor.
In the utility model, the selection of photoelectric tube requires wide as far as possible to the responding range of wavelength, and this point has determined the scope of power meter institute energy measurement laser source wavelength.Can select S1337 series, the S1227 series of Japanese shore pine company, the photoelectric tube of S1133 series for use, investigative range comprises from the near infrared to the near ultraviolet.The absorber of photoelectric tube is generally the versatility that strengthens detector and preferably adopts the face detecting according to being selected for use suitable shape by the characteristics of photometry light beam.Because what survey is the low light level, when light source when very weak, employing face receives photoelectric tube and is easy to guarantee that the light that is detected all receives.
Microprocessor can be selected 51 series for use, chips such as MSP430 series, inner responsiveness and the data processor of photoelectric tube to the light of different wave length that write in advance.
When measuring the luminous power of a certain wavelength, earlier import tested light wavelength by keyboard, after amplifier amplifies, be input to A/D converter by the electric signal of photoelectric tube output and be converted to digital signal, this digital signal is input to microprocessor through data processing, finally shows by the performance number of photometry at charactron with digital form.
The utility model is compared the useful effect that has with background technology:
1, this power meter adopts the direct conversion of light signal to electric signal, detector response time short (30 microsecond), and the detection accuracy height, and have thermal noise hardly.
2, the spectral response range of the detection system of this power meter wide (190nm-1100nm) is because can survey the power of whole near infrared to the low light level of near ultraviolet band.
3, this power meter is compared with the power meter on the present market, because existing power meter all is then to be approximate value in certain several specific wavelength calibration at other, this power meter adopts the long calibration of all-wave, and the measured value in all spectral response ranges is all had the same measuring accuracy.
4, this power meter employing face receives photoelectric tube, thereby is easy to guarantee institute's photometry is all absorbed.
Description of drawings
Fig. 1 is that the weak laser power meter constitutes block diagram;
Fig. 2 is a weak laser power meter physical circuit example;
Fig. 3 is S1337-BQ and the S1337-BR type photoelectric tube responsiveness with wavelength.
Embodiment
With reference to Fig. 1, weak laser power meter of the present utility model mainly comprises photoelectric tube 1, amplifier 2, A/D converter 3, microprocessor 4, keyboard 5 and charactron 6, the positive pole of photoelectric tube links to each other with amplifier input terminal, the output terminal of amplifier links to each other with an I/O mouth of microprocessor through A/D converter, and keyboard links to each other with one group of I/O mouth of microprocessor, and charactron links to each other with another group I/O mouth of microprocessor.
Fig. 2 is a weak laser power meter physical circuit example; In this example, photoelectric tube adopts S1337-BQ type photoelectric tube, and it has the absorber of 1.2 * 1.2cm, with the responsiveness of wavelength as shown in Figure 3; Amplifier adopts the OP27 high precision operating amplifier, and amplifier resistance adopts many grades of adjustable resistance R1, R2, R3, thus realize enlargement ratio be many grades adjustable; Microprocessor adopts the MSP430F133 processor that has the A/D translation function; The output terminal of amplifier links to each other with the P6.0 pin of MSP430F133 processor, and keyboard links to each other with processor P 4.0～P4.7 pin, and charactron links to each other with P2.0～P2.7 pin.To measure wavelength is that the LASER Light Source of 780nm is an example, be 780nm by the tested optical wavelength of keyboard to set up earlier, incided S1337-BQ type photoelectric tube absorber by photometry, light signal is converted into the A/D conversion input port P6.0 of electric signal input microprocessor after amplifier OP27 amplifies; The digital signal of signal after the A/D conversion carried out preset program through microprocessor according to the responsiveness of corresponding wavelength, at last result of calculation is presented at charactron.The light power meter principal feature of present embodiment:
1, wavelength response range 190-1100nm;
2, can be made as many gears by amplifier circuit and amplify, thereby can realize multi-range measurement, 2mW, 200 μ W, 20 μ W;
3, minimum resolution: 10nW;
4, directly show performance number, can directly measure,, can draw power by the corresponding wavelength of keyboard input to visible light and near infrared light;
5, the response time is short: 30 microseconds.
Above-mentioned embodiment is used for the utility model of explaining; rather than the utility model limited; in the protection domain of spirit of the present utility model and claim, any modification and change to the utility model is made all fall into protection domain of the present utility model.
Claims (3)
1. weak laser power meter, it is characterized in that comprising photoelectric tube (1), amplifier (2), A/D converter (3), microprocessor (4), keyboard (5) and charactron (6), the positive pole of photoelectric tube links to each other with amplifier input terminal, the output terminal of amplifier links to each other with an I/O mouth of microprocessor through A/D converter, and keyboard links to each other with one group of I/O mouth of microprocessor, and charactron links to each other with another group I/O mouth of microprocessor.
2. weak laser power meter according to claim 1 is characterized in that photoelectric tube is the photoelectric tube of S1337 series, S1227 series or S1133 series.
3. weak laser power meter according to claim 1 is characterized in that microprocessor (4) is 51 series or MSP430 family chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520102838 CN2800242Y (en) | 2005-06-10 | 2005-06-10 | Weak laser power meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520102838 CN2800242Y (en) | 2005-06-10 | 2005-06-10 | Weak laser power meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2800242Y true CN2800242Y (en) | 2006-07-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520102838 Expired - Fee Related CN2800242Y (en) | 2005-06-10 | 2005-06-10 | Weak laser power meter |
Country Status (1)
| Country | Link |
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| CN (1) | CN2800242Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101382455B (en) * | 2007-09-05 | 2011-06-01 | 武汉奇致激光技术有限公司 | Laser power detection device and detecting control method |
-
2005
- 2005-06-10 CN CN 200520102838 patent/CN2800242Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101382455B (en) * | 2007-09-05 | 2011-06-01 | 武汉奇致激光技术有限公司 | Laser power detection device and detecting control method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |