CN1380535A - Method for detecting reflecting light intensity - Google Patents
Method for detecting reflecting light intensity Download PDFInfo
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- CN1380535A CN1380535A CN 01105943 CN01105943A CN1380535A CN 1380535 A CN1380535 A CN 1380535A CN 01105943 CN01105943 CN 01105943 CN 01105943 A CN01105943 A CN 01105943A CN 1380535 A CN1380535 A CN 1380535A
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- interval
- light
- light intensity
- light source
- detection
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Abstract
The present invention relates to amethod for detecting intensity of return light, and is mainly characterized by that in interval T1 it makes the light source (LED) do not work and integrates the external interference light received by pin-shaped photodiode in negative direction, then in interval 2 it makes light source work, at the same time integrates the signal received in positive direction. If the T1 is equal to T2 in time, so that the output voltage in interval T3 can disply a value which has no influence of external light and is related to intensity of return light. In interval T4 it makes the integrator reset, and repeatedly makes operation from T1 so as to implement said invented method.
Description
The present invention is the method for relevant a kind of detection of reflected light intensity.
At present, during with the catoptrical emissivity of optical method for measuring, use certain frequency modulation (PFM) light source usually, and select to accept the signal of light in order to frequency filter.So, can eliminate ambient light and optic external disturbance.But frequency filter not only requires element more, and frequency band is narrow, and it is slow to adjust, and Measuring Time is longer.
Purpose of the present invention promptly is to adopt synchronous integration processing controls light source, and with simple circuit for eliminating external disturbance, thereby obtain good and measuring method high speed.
Below the present invention is done comparatively detailed explanation.
Fig. 1 illustrates the principle of work of sort circuit.
The present invention realizes by following operation principle. At first, light source (LED) is not worked, The external disturbance light that the aciculiform photoelectric diode is received is at the negative direction integration. Then, make light source in the T2 interval Work, simultaneously, with the signal that receives at the positive direction integration. If the time of T1 and T2 equates. So, Output voltage in the T3 interval will demonstrate the impact of no exterior light and the number relevant with intensity of reflected light on the contrary Value. In the T4 interval integrator is resetted, repeatedly carry out from T1 again, thereby realize method of the present invention.
Fig. 2 is the reflectivity testing circuit.
Sort circuit, output be that the infraluminescence diode of P=5-10mW and aciculiform photoelectric diode (adopt The TV remote product) combine, can be in distance 10-100mm place detection of reflected luminous intensity. Operational amplifier Input bias current should be more much smaller than photoelectric current, the time of integration and integrating capacitor are depended in gain.
Under power frequency (50 or 60HZ), in order effectively to avoid synchronous external disturbance, preferably make T1=T2=N/f (N answers round numbers, and f is power frequency), perhaps T1=T2＜＜1/f0 The characteristics of sort circuit are as follows: (1) can arrange Except exterior light is disturbed; (2) since elementary be integrator, so electrical noise is strong; Only have limited in (3) circulations Adjustment, so can measure at a high speed; (4) circuit is simple, does not need to adjust the position.
The present invention also can be used for detecting distance, inclination and transmitance except that being used for the detection of reflected rate, and is very effective to being used to detect various light intensities especially.The present invention with simple circuit for eliminating external disturbance, thereby obtains good and measuring method at a high speed by a kind of method of detection of reflected light intensity.
Claims (3)
1. the method for a detection of reflected light intensity is characterized in that: adopt synchronous integration processing controls light source, and with simple circuit for eliminating external disturbance, thereby obtain good and measuring method high speed.
2. the method for a kind of detection of reflected light intensity as claimed in claim 1 is characterized in that: have only limited adjustment in the circulation, so can measure at a high speed.
3. the method for a kind of detection of reflected light intensity as claimed in claim 1 is characterized in that: circuit is simple.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01105943 CN1380535A (en) | 2001-04-10 | 2001-04-10 | Method for detecting reflecting light intensity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01105943 CN1380535A (en) | 2001-04-10 | 2001-04-10 | Method for detecting reflecting light intensity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1380535A true CN1380535A (en) | 2002-11-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01105943 Pending CN1380535A (en) | 2001-04-10 | 2001-04-10 | Method for detecting reflecting light intensity |
Country Status (1)
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| CN (1) | CN1380535A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1934430B (en) * | 2004-03-18 | 2010-09-29 | 浜松光子学株式会社 | Photodetector |
| CN101312681B (en) * | 2005-11-21 | 2011-01-12 | 皇家飞利浦电子股份有限公司 | Detection module |
| CN102023052A (en) * | 2010-10-27 | 2011-04-20 | 大连工业大学 | Detection device and method of reflected light |
| CN104780640A (en) * | 2014-01-10 | 2015-07-15 | 阳江纳谷科技有限公司 | Light control system, method for controlling light source, lighting device |
-
2001
- 2001-04-10 CN CN 01105943 patent/CN1380535A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1934430B (en) * | 2004-03-18 | 2010-09-29 | 浜松光子学株式会社 | Photodetector |
| CN101312681B (en) * | 2005-11-21 | 2011-01-12 | 皇家飞利浦电子股份有限公司 | Detection module |
| CN102023052A (en) * | 2010-10-27 | 2011-04-20 | 大连工业大学 | Detection device and method of reflected light |
| CN102023052B (en) * | 2010-10-27 | 2011-12-28 | 大连工业大学 | Detection device and method of reflected light |
| CN104780640A (en) * | 2014-01-10 | 2015-07-15 | 阳江纳谷科技有限公司 | Light control system, method for controlling light source, lighting device |
| CN104780640B (en) * | 2014-01-10 | 2017-10-31 | 阳江纳谷科技有限公司 | Optimizing Control System, the method and lighting device for controlling light source |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |