CN205333514U - Optical element reflectivity measuring apparatu - Google Patents
Optical element reflectivity measuring apparatu Download PDFInfo
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- CN205333514U CN205333514U CN201620028723.7U CN201620028723U CN205333514U CN 205333514 U CN205333514 U CN 205333514U CN 201620028723 U CN201620028723 U CN 201620028723U CN 205333514 U CN205333514 U CN 205333514U
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- optical element
- laser
- optical
- voltage signal
- instrument
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Abstract
The utility model provides an optical element reflectivity measuring apparatu for the measurement of optical element reflectivity. The utility model discloses an optical element reflectivity measuring apparatu adopts photodiode to gather the reverberation of optical element or optical standard piece and convert the signal of telecommunication into, and the signal of telecommunication amplifies the back through preamplifier and lock -in amplifier again, obtains the DC voltage signal who is directly proportional with pilot light intensity. This instrument uses to be measured the gained DC voltage signal of optical standard piece reverberation and as the benchmark, measures the gained DC voltage signal of element under test reverberation and compare with the benchmark, the optical element's that obtains to await measuring reflectivity. The utility model discloses simple structure easily realizes, measurement accuracy is high, and can realize the on line measurement to the optical element reflectivity.
Description
Technical field
This utility model belongs to instrumental science field, is specifically related to a kind of optical element reflectivity instrument。
Background technology
In the many important application projects of country and scientific research and testing, as high power large-scale laser is tested, it is required for bigbore optical element, and the quality of optical element is the key factor ensureing whole success of the test, so needing the important performance reflectance of optical elements of large caliber is carried out high-precision measurement。Along with developing rapidly of laser technology, the performance of laser rete being proposed increasingly higher requirement, wherein the reflectance of laser rete is one of most important parameter of rete。Owing to the required precision that some rete reflectance is proposed is higher, for instance: antiradar reflectivity R<0.5%, high reflectance R>99.7%。
The spectrophotometer measurement light transmittance of the reflectance general of existing measurement optical element, the method being then converted into reflectance again, it is impossible to reach higher required precision, it is necessary to seek new measurement instrument and new measuring method。At present with the accessories apparatus measuring reflectance on some spectrophotometer, but this instrument also has its shortcoming, it is exactly adopt photomultiplier tube as detector, can only use in dark environment, and measurement optical element dimension is restricted, it is impossible to meet the requirement of on-line measurement optical element reflectance。
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of optical element reflectivity instrument。
Optical element reflectivity instrument of the present utility model, including laser instrument, chopper, sample is installed platform, optical standard sheet, photodiode, preamplifier, lock-in amplifier and computer；
The laser of described laser instrument output becomes pulsed light after chopper is modulated, pulsed light direct irradiation optical standard sheet or optical element to be measured, the reflection light reflected from optical standard sheet or optical element to be measured is received and converted to the signal of telecommunication by photodiode, the signal of telecommunication exports, after amplifying respectively through preamplifier and lock-in amplifier, the DC voltage being directly proportional to reflective light intensity, and DC voltage is received by computer and shows。
The Output of laser of described laser instrument is continuous light, and power is less than 20mW；
The continuous light of described chopper modulation laser instrument output and the frequency of pulsed light that produces are more than 1000Hz。
The reflectance of described optical standard sheet is less than or equal to 4%。
Work process of the present utility model is:
A. it is fixed value R by reflectancesOptical standard sheet be installed on sample and be installed on platform；
B. chopper, preamplifier, lock-in amplifier and computer power on；
C. open laser instrument, adjust power so that it is output, less than 20mW, exports continuous laser；
D. computer is utilized to read the DC voltage value V1 of now lock-in amplifier output, by V1 as the reference voltage；
E. close laser instrument or block laser, taking off optical standard sheet, optical element to be measured is installed on sample and is installed on platform；
F. open laser instrument or remove dark slide, utilizing computer to read the DC voltage value V2 of lock-in amplifier output now；
G. the magnitude of voltage V1 comparison that the magnitude of voltage V2 that step f records and step d records, according to formula R=Rs× V2/V1 obtains the reflectance R of optical element to be measured；
H. laser instrument, chopper, preamplifier, lock-in amplifier and computer are closed。
This utility model adopts conventional photodiode to gather optical signal as light-sensitive element, can use under normal conditions, adopts lock-in amplifier that signal is amplified, it is possible to useful signal to be detected in strong noise and jamming pattern。This utility model simple in construction, it is easy to accomplish, it is suitable for the on-line measurement optical element reflectance to fixed wave length laser。
Accompanying drawing explanation
Fig. 1 is the structural representation of optical element reflectivity instrument of the present utility model；
In figure, 1. laser instrument 2. chopper 3. sample is installed platform 4. optical standard sheet 5. photodiode 6. preamplifier 7. lock-in amplifier 8. computer。
Detailed description of the invention
This utility model is illustrated below in conjunction with accompanying drawing。
Embodiment 1
Referring to Fig. 1, optical element reflectivity instrument of the present utility model includes laser instrument 1, chopper 2, and sample is installed platform 3, optical standard sheet 4, photodiode 5, preamplifier 6, lock-in amplifier 7 and computer 8；
The laser of described laser instrument 1 output becomes pulsed light after chopper 2 is modulated, pulsed light direct irradiation is being positioned over optical standard sheet 4 or the optical element to be measured that sample is installed on platform 3, the reflection light reflected from optical standard sheet 4 or optical element to be measured is received and converted to the signal of telecommunication by photodiode 5, the signal of telecommunication exports, after amplifying respectively through preamplifier 6 and lock-in amplifier 7, the DC voltage being directly proportional to reflective light intensity, and DC voltage is received by computer 8 and shows。
The Output of laser of described laser instrument 1 is continuous light, and power is less than 20mW；
The frequency of pulsed light that described chopper 2 is modulated the continuous light of laser instrument 1 output and produced is more than 1000Hz。
The reflectance of described optical standard sheet 4 is equal to 4%。
It is fixed value R by reflectancesOptical standard sheet be installed on sample and be installed on platform；Chopper, preamplifier, lock-in amplifier and computer power on；Open laser instrument, adjust power so that it is output is less than 20mW；Computer is utilized to read the DC voltage value V1 of now lock-in amplifier output；Close laser instrument or block laser, taking off optical standard sheet, by optical element K9 glass to be measured, incident laser and K9 glass surface angle at 45 °, being installed on sample and be installed on platform；Open laser instrument or remove dark slide, utilizing computer to read the DC voltage value V2 of lock-in amplifier output now；Finally utilize formula R=RsIt is 1.012% that × V2/V1 obtains the reflectance R of optical element to be measured。
Embodiment 2
Embodiment 2 is essentially identical with the embodiment of embodiment 1, differs primarily in that one reflectance 3.5% optical standard sheet 4 of replacing is for measuring the reflectance R of optical element to be measured。
This utility model is not limited to above-mentioned detailed description of the invention, and person of ordinary skill in the field, from above-mentioned design, without performing creative labour, done all conversion, all falls within protection domain of the present utility model。
Claims (4)
1. an optical element reflectivity instrument, it is characterised in that include laser instrument (1), chopper (2), sample is installed platform (3), optical standard sheet (4), photodiode (5), preamplifier (6), lock-in amplifier (7) and computer (8)；
The continuous laser that described laser instrument (1) exports becomes pulse laser after chopper (2) is modulated, pulse laser direct irradiation is being positioned over the optical standard sheet (4) that sample is installed on platform (3), the reflected impulse laser reflected from optical standard sheet (4) is received and converted to pulse voltage signal by photodiode (5), after pulse voltage signal sequentially passes through preamplifier (6) and lock-in amplifier (7) amplification, the d. c. voltage signal that output is directly proportional to reflective light intensity, d. c. voltage signal transmits to computer (8)。
2. optical element reflectivity instrument according to claim 1, it is characterised in that the continuous laser that described laser instrument (1) exports, power is less than 20mW。
3. optical element reflectivity instrument according to claim 1, it is characterised in that the frequency of described pulse laser is more than 1000Hz。
4. optical element reflectivity instrument according to claim 1, it is characterised in that the reflectance of described optical standard sheet (4) is less than or equal to 4%。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620028723.7U CN205333514U (en) | 2016-01-13 | 2016-01-13 | Optical element reflectivity measuring apparatu |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620028723.7U CN205333514U (en) | 2016-01-13 | 2016-01-13 | Optical element reflectivity measuring apparatu |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205333514U true CN205333514U (en) | 2016-06-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620028723.7U Expired - Fee Related CN205333514U (en) | 2016-01-13 | 2016-01-13 | Optical element reflectivity measuring apparatu |
Country Status (1)
| Country | Link |
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| CN (1) | CN205333514U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105527252A (en) * | 2016-01-13 | 2016-04-27 | 中国工程物理研究院激光聚变研究中心 | Optical element reflectivity measurement instrument |
-
2016
- 2016-01-13 CN CN201620028723.7U patent/CN205333514U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105527252A (en) * | 2016-01-13 | 2016-04-27 | 中国工程物理研究院激光聚变研究中心 | Optical element reflectivity measurement instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160622 Termination date: 20190113 |