CN202471575U - Visibility standard device with absorption type filters - Google Patents
Visibility standard device with absorption type filters Download PDFInfo
- Publication number
- CN202471575U CN202471575U CN2012200385049U CN201220038504U CN202471575U CN 202471575 U CN202471575 U CN 202471575U CN 2012200385049 U CN2012200385049 U CN 2012200385049U CN 201220038504 U CN201220038504 U CN 201220038504U CN 202471575 U CN202471575 U CN 202471575U
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- Prior art keywords
- optical filter
- photodiode
- receiver
- energy
- energy detection
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Abstract
The utility model discloses a visibility standard device with absorption type filters, which comprises an emitter, a receiver and an energy detection device arranged on the receiver, wherein an LED is arranged in the emitter; a receiving lens and a receiving filer in front of the receiving lens are arranged in the receiver in the light-advance direction; an energy detection photodiode is arranged in the energy detection device; a receiving photodiode and the energy detection photodiode are the same photodiodes with low nonlinear error; an energy detection filter in front of the energy detection photodiode is arranged in the energy detection device in the light-advance direction; and both the receiving filter and the energy detection filter are the absorption type filters which are matched with the optical property of the LED in the emitter. The visibility standard device provided by the utility model is not affected by temperature drift.
Description
Technical field
The utility model relates to a kind of visibility standards device.
Background technology
The visibility standards device is actually the high visiometer of a kind of precision, and the measured value that generally adopts the visibility standards device is as other visibility instruments of standard calibration.High, portable, the convenient calibration of visibility standards device measuring accuracy.The technical indicator of visibility most critical is a measuring accuracy, and variation of ambient temperature is to influence one of its accuracy factors.Environment temperature will cause the variation like the responsiveness of light source center wavelength, photodiode, optical filter transmitance, thereby influence optical gain.
Existing visibility standards device is as shown in Figure 1, comprises the energy testing apparatus 30 that is provided with on transmitter 10, receiver 20 and the transmitter.Energy testing apparatus 30 is used to detect the energy of light emitting diode emission, and receiver is as shown in Figure 2, is followed successively by cover glass 4, lens 2, receives optical filter 3 and receives photodiode 1 along optical path direction.Wherein, receiving optical filter 3 is the absorption-type optical filter.With respect to light emitting diode, receive the light that photodiode 1 can receive big frequency range, and the light frequency that light emitting diode sends is very narrow.
Because the characteristic of light emitting diode itself, centre wavelength can be with temperature variation, and the peak wavelength of optical filter and bandwidth and light emitting diode coupling are bad, can produce temperature drift.The response of diode is simultaneously received optical wavelength, ambient temperature effect, also has nonlinear characteristic simultaneously.
The utility model content
The purpose of the utility model provides a kind of visibility standards device that adopts the absorption-type optical filter, in order to overcome the influence of temperature drift to device.
For realizing above-mentioned purpose; The scheme of the utility model is: a kind of visibility standards device that adopts the absorption-type optical filter; Comprise the energy testing apparatus that is provided with on transmitter, receiver and the receiver; Be provided with light emitting diode in the transmitter, be provided with receiver lens and receive photodiode along the light direct of travel in the receiver, before or after receiver lens, be provided with the reception optical filter; Be provided with the energy measuring photodiode in the said energy testing apparatus, said reception photodiode and energy measuring photodiode are the photodiode of the low nonlinear error of same type; In the said energy testing apparatus along the light direct of travel; Be provided with an energy measuring optical filter before the said energy measuring photodiode, said reception optical filter and energy measuring optical filter be with transmitter in the absorption-type optical filter that matees of light emitting diode (LED) light characteristic.
In the said receiver, before receiving optical filter, be provided with cover glass.
Said reception photodiode and energy measuring photodiode are the photodiode of the low nonlinear error of same type; Receive optical filter and energy measuring optical filter be with transmitter in the absorption-type optical filter that matees of light emitting diode (LED) light characteristic; The absorption-type optical filter can absorb the light that is positioned at through beyond the spectral bandwidth; Incident angle is very little to the influence of absorption-type optical filter, and spectral characteristic is stable, therefore; Before the absorption-type optical filter can be placed on lens, also can be placed on the lens back.Optical filter is placed on the lens back; Can make structure compact more; The figure of optical filter in the lens back only draws in the accompanying drawing; Before the energy measuring photodiode, add one with the absorption-type energy measuring optical filter that receives the optical filter coupling, the state that incident light gets into the energy measuring photodiode gets into the state consistency that receives photodiode with incident light, can reduce or eliminate the temperature that gains and float.
Description of drawings
Fig. 1 is the visibility standards device synoptic diagram of the utility model;
Fig. 2 is the receiver architecture figure of the utility model;
Fig. 3 is the emitter structures synoptic diagram of the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is done further detailed explanation.
In order to reduce of the influence of particulate size, adopt high-power light-emitting pipe (LED) light source near human-eye visual characteristic to measuring accuracy.Because the self character of LED, centre wavelength can be with temperature variation, and that the peak wavelength and the bandwidth that receive optical filter and luminotron mate is bad, can produce temperature and float.
In order to overcome the influence of temperature drift, the visibility standards device is as shown in Figure 1, comprises the energy testing apparatus 30 that is provided with on transmitter 10, receiver 20 and the transmitter.Energy testing apparatus 30 is used to detect the energy of light emitting diode emission, and receiver is as shown in Figure 2, is followed successively by cover glass 4, lens 2, receives optical filter 3 and receives photodiode 1 along optical path direction.Wherein, receiving optical filter 3 is the absorption-type optical filter, as other embodiments, receives optical filter 3 and also can be arranged on before the lens 2.Like Fig. 3, diversing lens 13, emission cover glass 14 are arranged in the transmitter, also be provided with an energy testing apparatus on the transmitter, energy measuring photodiode 32 is installed on the energy testing apparatus.Receive the photodiode that photodiode 1 and energy measuring photodiode 32 are the low nonlinear error of same type; In the energy testing apparatus along the light direct of travel; Before energy measuring photodiode 32, be provided with an energy measuring optical filter 31, energy measuring optical filter and 31 receive optical filters 3 be with transmitter in the absorption-type optical filter (like coloured glass) that matees of light emitting diode (LED) optical characteristics.Adopt this mode, make that receiver and energy testing apparatus are synchronous, avoided the influence of temperature drift.
Claims (2)
1. visibility standards device that adopts the absorption-type optical filter; Comprise the energy testing apparatus that is provided with on transmitter, receiver and the receiver; Be provided with light emitting diode in the transmitter; Be provided with receiver lens and receive photodiode along the light direct of travel in the receiver, before or after receiver lens, be provided with the reception optical filter; Be provided with the energy measuring photodiode in the said energy testing apparatus, it is characterized in that, said reception photodiode and energy measuring photodiode are the photodiode of the low nonlinear error of same type; In the said energy testing apparatus along the light direct of travel; Be provided with an energy measuring optical filter before the said energy measuring photodiode, said reception optical filter and energy measuring optical filter be with transmitter in the absorption-type optical filter that matees of light emitting diode (LED) light characteristic.
2. the visibility standards device of employing absorption-type optical filter according to claim 1 is characterized in that, in the said receiver, before receiving optical filter, is provided with cover glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200385049U CN202471575U (en) | 2011-11-30 | 2012-02-08 | Visibility standard device with absorption type filters |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120488679 | 2011-11-30 | ||
| CN201120488679.5 | 2011-11-30 | ||
| CN2012200385049U CN202471575U (en) | 2011-11-30 | 2012-02-08 | Visibility standard device with absorption type filters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202471575U true CN202471575U (en) | 2012-10-03 |
Family
ID=46919727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200385049U Expired - Lifetime CN202471575U (en) | 2011-11-30 | 2012-02-08 | Visibility standard device with absorption type filters |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202471575U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818771A (en) * | 2011-11-30 | 2012-12-12 | 凯迈（洛阳）环测有限公司 | Visibility standard device adopting absorptive optical filters |
-
2012
- 2012-02-08 CN CN2012200385049U patent/CN202471575U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818771A (en) * | 2011-11-30 | 2012-12-12 | 凯迈（洛阳）环测有限公司 | Visibility standard device adopting absorptive optical filters |
| CN102818771B (en) * | 2011-11-30 | 2016-02-24 | 凯迈（洛阳）环测有限公司 | A kind of visibility standards device adopting absorption-type optical filter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121003 |