CN108007565A - A kind of luminous power detection method - Google Patents
A kind of luminous power detection method Download PDFInfo
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- CN108007565A CN108007565A CN201711162136.2A CN201711162136A CN108007565A CN 108007565 A CN108007565 A CN 108007565A CN 201711162136 A CN201711162136 A CN 201711162136A CN 108007565 A CN108007565 A CN 108007565A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
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Abstract
A kind of luminous power detection method, the described method includes：The first sampled voltage is obtained in sample point；Calculated using the first sampled voltage and obtain the first luminous power；According to pre-set interval, using the first detection circuit corresponding to the first threshold scope belonging to the first luminous power, constant duration sampling is carried out to the voltage of the sampled point, obtains the second sampled voltage；Calculated using the second sampled voltage and obtain the second luminous power；If the second luminous power is more than the upper limit of the first threshold scope, using the second detection circuit corresponding to the second threshold scope belonging to the second luminous power, constant duration sampling is carried out to the voltage of the sampled point, obtains the 3rd sampled voltage；Wherein, first detection circuit is different detection circuits from second detection circuit；Calculated using the 3rd sampled voltage and obtain the 3rd luminous power.The present invention provides a kind of detection method that can detect a wide range of luminous power.
Description
Technical field
This application involves optical communication field, more particularly to a kind of luminous power detection method.
Background technology
In optical communication field, luminous power is a critically important parameter, and usually all light devices are required for carrying out light
The sampling and detection of power.Usually luminous power sampling can be carried out by the way of linearisation samples, for example with AD conversion
Device is sampled.
What usual a/d converter gathered is the voltage of sampled point, on the premise of resolution ratio is ensured, single a/d converter
Voltage sample scope is usually between 30mV~3300mV, and the scope of 20dBm is minimum amount of voltage that equivalent to maximum voltage value
100 times, i.e. 30mV*100=3000mV, approaches with 3300mV, i.e., sample range one of traditional a/d converter to luminous power
As be within 0~20dBm, but for light opens the light product, it is necessary to luminous power working range be usually be higher than
20dBm, generally reaches twice or so even more high of a/d converter sample range.Sampled at this time only with traditional a/d converter
It cannot meet the requirements, and logafier chip price is fairly expensive, can greatly improve production cost, it is difficult to meet production
It is required.
Therefore it provides a kind of detection method that can detect large-scale luminous power has great importance.
The content of the invention
In order to overcome problem present in correlation technique, the present invention provides a kind of inexpensive, large-scale luminous power inspection
Survey method.
To achieve the above object, the application employs following technical solution：
A kind of luminous power detection method, the described method includes：
The first sampled voltage is obtained in sample point；
Calculated using the first sampled voltage and obtain the first luminous power；
According to pre-set interval, the first detection electricity corresponding to the first threshold scope belonging to the first luminous power is used
Road, carries out constant duration sampling to the voltage of the sampled point, obtains the second sampled voltage；
Calculated using the second sampled voltage and obtain the second luminous power；
If the second luminous power is more than the upper limit of the first threshold scope, the second threshold belonging to the second luminous power is used
The second detection circuit corresponding to scope, constant duration sampling is carried out to the voltage of the sampled point, obtains the 3rd sampling electricity
Pressure；Wherein, first detection circuit is different detection circuits from second detection circuit；
Calculated using the 3rd sampled voltage and obtain the 3rd luminous power.
Optionally, if the 3rd luminous power being calculated using the 3rd sampled voltage is more than the second threshold scope
The upper limit, using the three testing circuit corresponding to the 3rd threshold range belonging to the 3rd luminous power, to the voltage of the sampled point
Constant duration sampling is carried out, obtains the 4th sampled voltage.
Optionally, the 3rd threshold range is identical with first threshold scope, and three testing circuit and the first detection electricity
Road is same detection circuit.
Optionally, the first sampled voltage is obtained in sample point, including：
First sampled voltage of the sampled point is obtained by a/d converter；
The first threshold scope, second threshold scope or the 3rd threshold range adopting in the single a/d converter
In the corresponding reference optical power of sample voltage.
Optionally, using the first threshold scope belonging to the first luminous power corresponding to the first detection circuit, including：
When the first luminous power is in first threshold scope, the a/d converter is connected with the first detection circuit.
Optionally, using the second threshold scope belonging to the second luminous power corresponding to the second detection circuit, including
When the second luminous power is more than the upper limit of the first threshold scope, and is located at second threshold scope, the AD turns
Parallel operation is connected by relay and the second detection circuit.
Optionally, exist between the first threshold scope and the second threshold scope and partially overlap.
Optionally, the first threshold scope is, in each threshold range belonging to first luminous power, corresponding to endpoint
One of luminous power minimum.
Optionally, exist between the second threshold scope and the 3rd threshold range and partially overlap.
Optionally, calculated using the first sampled voltage and obtain the first luminous power, including,
P0=A+10log (V/ (K*R))；
Wherein, P0For the first luminous power, A is the loss in light path, and K is the current coefficient of PIN pipes when sampling, and V is
First sampled voltage, R are the resistance in the first detection circuit.
Large-scale luminous power can be detected by an a/d converter in an embodiment of the present invention, meanwhile,
Excessive component is not increased, the realization of scheme is simple, can either be cost-effective, is also easy to be produced in batches, can be extensive
Applied in various product or the equipment for needing to detect large-scale luminous power.
Brief description of the drawings
, below will be to attached drawing needed in the embodiment in order to illustrate more clearly of the technical solution of the present application
It is briefly described, it should be apparent that, for those of ordinary skills, in the premise of not making the creative labor property
Under, other attached drawings can also be obtained according to these attached drawings.
Fig. 1 is the flow chart of the embodiment of the present application one；
Fig. 2 is the operation principle schematic diagram of the embodiment of the present application one；
Fig. 3 is a kind of electrical block diagram of the embodiment of the present application one；
Fig. 4 is a kind of operation principle schematic diagram of the embodiment of the present application two；
Fig. 5 is another operation principle schematic diagram of the embodiment of the present application two；
Fig. 6 is the flow chart of the embodiment of the present application two.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Whole description.Obviously, described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment, belongs to the scope of protection of the invention.
Embodiment one
The present embodiment provides a kind of luminous power detection method being detected to large-scale luminous power, as shown in Figure 1, institute
Detection method is stated mainly to include the following steps：
Step 101：The first sampled voltage is obtained in sample point；
First sampled voltage refers to start the initial voltage obtained during detection from sampled point, can be obtained by a/d converter
Take.
Step 102：Calculated using the first sampled voltage and obtain the first luminous power；
The first sampled voltage that the a/d converter obtains can obtain corresponding luminous power according to default calculation.
Step 103：According to pre-set interval, corresponding to the first threshold scope belonging to the first luminous power is used
One detection circuit, carries out constant duration sampling to the voltage of the sampled point, obtains the second sampled voltage；
The first threshold scope in the corresponding reference optical power of sampled voltage of the acquisition of the single a/d converter,
Second sampled voltage and follow-up sampled voltage are obtained by a/d converter.
Step 104：Calculated using the second sampled voltage and obtain the second luminous power；
Step 105：If the second luminous power exceeds the first threshold scope, the second threshold belonging to the second luminous power is used
It is worth the second detection circuit corresponding to scope, constant duration sampling is carried out to the voltage of the sampled point, obtains the 3rd sampling
Three sampled voltage of voltage regulation；Wherein, first detection circuit is different detection circuits from second detection circuit；
Wherein, sampled voltage corresponding luminous power model of the second threshold scope in the acquisition of the single a/d converter
In enclosing.
Step 106：Calculated using the 3rd sampled voltage and obtain the 3rd luminous power.
Referring to Fig. 1, for the principle schematic of the detection method of embodiments herein one.It is to be detected in embodiment one
The reference optical power of product is -15dBm~24dBm, i.e., scope is 39dBm, and the sampling that the a/d converter of use can obtain is electric
It is 20dBm to press corresponding reference optical power.In order to be carried out using same a/d converter to the luminous power of product to be detected
Detection, is divided into first threshold scope and second threshold scope by the reference optical power for needing to detect in advance, wherein, for the ease of
Illustrate, the first threshold scope is -15dBm~5dBm, and second threshold scope is 4dBm~24dBm, will described
One threshold range is defined as in two threshold ranges, less one of the luminous power corresponding to endpoint, but this only to facilitate
Illustrate made definition, when practical application can be not limited by this.
A/d converter and the first detection circuit or the second inspection are realized in this embodiment by a hilted broadsword relay
Connection between slowdown monitoring circuit, specifically, when the first luminous power is in first threshold scope, the a/d converter and the first detection electricity
Road is connected, and according to pre-set interval, carries out constant duration sampling to sampled point using a/d converter, obtain second
Sampled voltage.
Calculated using the second sampled voltage and obtain the second luminous power, if second luminous power is more than the first threshold
The upper limit of scope, and when being located at second threshold scope, the a/d converter are switched to and the by relay from the first detection circuit
Two detection circuits are connected.
Specifically, work as the first luminous power in the range of -15~5dBm, i.e. when the first luminous power is located at first threshold scope,
The a/d converter is connected with the first detection circuit；With the increase of luminous power, when equipment is detected more than 5dBm luminous powers,
Relay is adjusted to low level, and a/d converter is switched to and is connected with the second detection circuit..
Likewise, work as the first luminous power in the range of 5~24dBm, i.e. when the first luminous power is located at second threshold scope, institute
State a/d converter and be located at the second detection circuit, with the reduction of luminous power, the sampled voltage obtained by a/d converter calculates
When the luminous power gone out is less than 4dBm, relay is adjusted to high level, and a/d converter is switched to and is connected with the first detection circuit.
Exist in addition, there is likely to be in detection process between the first threshold scope and the second threshold scope
Situation about partially overlapping, such as in the present embodiment, 4dBm~5dBm is an overlapping region, if the first initial sampling electricity
Pressure is by calculating the first luminous power obtained not in the overlapping region, then detection mode is detected i.e. in the manner described above
Can, i.e., which threshold range is the first luminous power be located at, and is just detected using the corresponding detection circuit of the threshold range.
If the first luminous power obtained is calculated in the range of overlapping by the first sampled voltage of acquisition, using first
Detection circuit is detected, i.e., using in two threshold ranges, less one of the luminous power corresponding to endpoint.
Need to illustrate, when two threshold ranges, there are the essence that during overlapping region, can preferably ensure detection
Degree, because it is possible that unsure state, adjacent thresholds scope when luminous power switches between adjacent thresholds scope
Between can prevent from, since sampled voltage is located at unstable caused by critical point, reducing the mistake of measuring light power there are overlapping region
Difference.
The sampled voltage obtained by a/d converter needs according to default mode calculate to obtain corresponding luminous power,
The calculation formula of luminous power is in optical-fibre communications：
P0=A+10log (V/ (K*R))；
Wherein, P0For luminous power, A is the loss in light path, such as the loss of splitter etc., generally 20dBm, K are to adopt
The current coefficient of PIN pipes during sample, it is sampled voltage that 0.95, V is taken in embodiment one, and R is the resistance in detection circuit.With
Exemplified by calculating luminous power by the first sampled voltage, P0 is the first luminous power, and A is the loss in light path, and K is used when sampling
The current coefficient of PIN pipes, V are the first sampled voltage, and R is the first resistor R101 in the first detection circuit.
Wherein, R is and the corresponding resistance of detection circuit, in the present embodiment, first detection circuit corresponding the
One resistance R101=75KOhm, the corresponding second resistance R102=1.5KOhm of the second detection circuit.Certainly, in use
Suitable resistance R can be selected according to the reference optical power for being actually subjected to detection, not do excessive restriction herein.
Illustrate and the calculating process of above-mentioned formula is illustrated, when luminous power be located at first threshold scope, as -15dBm
During~5dBm, relay is located at high level, and a/d converter is connected with the first detection circuit, the first resistor in the first detection circuit
R101=75KOhm, wherein：
As voltage V=30mV, P0=20+10log (30/ (0.95*75000))=- 13.76dBm；
As voltage V=3300mV, P0=20+10log (3300/ (0.95*75000))=6.66dBm.
Similar, when luminous power is located at second threshold scope, when being 4dBm~24dBm, relay is located at low level,
A/d converter is connected with the second detection circuit, the second resistance R102=1.5KOhm in the second detection circuit, wherein：
As voltage V=30mV, P0=20+10log (30/ (0.95*1500))=3.23dBm；
As voltage V=3300mV, P0=20+10log (3300/ (0.95*1500))=23.64dBm.
Above-mentioned theory calculating is simply illustrative to the calculating process of formula on the premise of given voltage, due to
Have certain error in actual circuit, in application process can by the first detection circuit and the first detection circuit respectively into
The modified method of row, ensures that detection range can cover 4dBm~24dBm and -15dBm~5dBm so that actually detected scope is big
In above-mentioned two range section, to ensure the accuracy of large-scale luminous power testing result.
The present embodiment can use a variety of detection circuits on the basis of the principle schematic of Fig. 1 is met, be illustrated in figure 3 it
A kind of middle embodiment, introduces its hardware circuit and corresponding ideas on software design herein.
Wherein, luminous power selects PIN pipes to be sampled, i.e. U1 in Fig. 3, in the present embodiment, passes through 1 in light path：99 points
The optical signal that road device comes is converted to electric current by PIN pipes U1, and corresponding detection circuit, warp are selected according to different threshold ranges
After crossing first resistor R101 or second resistance R102, the sampled voltage of Output optical power at OP_OUT2 in circuit, and
OP_SET signal control relays S3 is to be located at low level or high level.When relay is high level, with first threshold model
Enclose corresponding, using the first detection circuit, select first resistor R101；When relay is low level, with second threshold scope
It is corresponding, using the second detection circuit, select second resistance R102.
On the selection of relay S3, suitable model can be selected according to the demand of actual use, to meet circuit in itself
The demand of hardware design, such as has good performance of handoffs so that is not in handoff procedure delay in actual use
Situation etc., do not do excessive restriction herein.
Common a/d converter reference optical power that can be detected is 20dBm, and the present embodiment is by the reference optical power of detection
Expand, can be detected between 0~40dBm.Meanwhile do not increase excessive component, the reality of scheme
It is existing relatively simple, can be cost-effective, it is also easy to be produced in batches.
Embodiment two
Embodiment two further expands the scope of detected luminous power on the basis of embodiment one, in this implementation
In example, the maximum luminous power scope of detection is three times of the corresponding reference optical power of sampled voltage that a/d converter obtains.Referring to
Fig. 4 and Fig. 5, is two kinds of achievable two mesh object detection method principle schematics of the embodiment of the present application.The detection method is main
Include the following steps：
Step 201：The first sampled voltage is obtained in sample point；
First sampled voltage refers to start the initial voltage obtained during detection from sampled point, can be obtained by a/d converter
Take,
Step 202：Calculated using the first sampled voltage and obtain the first luminous power；
The first sampled voltage that the a/d converter obtains can obtain corresponding luminous power according to default calculation.
Step 203：According to pre-set interval, corresponding to the first threshold scope belonging to the first luminous power is used
One detection circuit, carries out constant duration sampling to the voltage of the sampled point, obtains the second sampled voltage；
The first threshold scope in the corresponding reference optical power of sampled voltage of the acquisition of the single a/d converter,
Second sampled voltage and follow-up sampled voltage are obtained by a/d converter.
Step 204：Calculated using the second sampled voltage and obtain the second luminous power；
Step 205：If the second luminous power exceeds the first threshold scope, the second threshold belonging to the second luminous power is used
It is worth the second detection circuit corresponding to scope, constant duration sampling is carried out to the voltage of the sampled point, obtains the 3rd sampling
Voltage；Wherein, first detection circuit is different detection circuits from second detection circuit；
Wherein, sampled voltage corresponding luminous power model of the second threshold scope in the acquisition of the single a/d converter
In enclosing.
Step 206：Calculated using the 3rd sampled voltage and obtain the 3rd luminous power.
Step 207：When the 3rd luminous power is more than the upper limit of the second threshold scope, the described in the 3rd luminous power is used
Three testing circuit corresponding to three threshold ranges, carries out constant duration sampling to the voltage of the sampled point, obtains the 4th
Sampled voltage.
Wherein, the 3rd threshold range is also the corresponding smooth work(of sampled voltage in the acquisition of the single a/d converter
In the range of rate.
Citing illustrates above-mentioned detection mode, in embodiment two, it is assumed that the luminous power detection model of product to be detected
It is that -30dBm arrives+30dBm to enclose, i.e., whole detection range is 60dBm, the sampled voltage pair that the a/d converter of use can obtain
The reference optical power answered is 20dBm.In order to carry out luminous power detection to product to be detected using same a/d converter, in advance
The reference optical power of required detection is first divided into first threshold scope, second threshold scope and the 3rd threshold range, wherein,
For convenience of description, the first threshold scope is -30~-10dBm, and second threshold scope is -10~+10dBm, the described 3rd
Threshold range is+10~30dBm.
A/d converter and the first detection circuit, second are realized in this embodiment by one or two relays
Connection between detection circuit or three testing circuit.Illustrate as shown in Figure 4 and Figure 5 for two kinds of testing principles of the present embodiment
Figure, by three detection circuit parallel connections in Fig. 4, using a two keys relay, wherein first and second points are initially all located at high electricity
It is flat, two hilted broadsword relays are used in Fig. 5, by the first detection circuit it is in parallel with the second detection circuit after be electrically connected with the first relay
Connect, then three testing circuit is electrically connected with the second relay, for ease of illustration, it can be assumed that the first relay and the second relay
Device initial value is all high level.Circuit diagram shown in above-mentioned Fig. 4 and Fig. 5 can form the switching circuit of a 3 road signals,
To realize the handoff procedure between three detection circuits.
Illustrated by taking the principle schematic shown in Fig. 5 as an example, wherein, circuit where R201 is the first detection circuit,
Circuit where R202 is the second detection circuit, and circuit where R203 is three testing circuit, is examined with the first detection circuit and second
What slowdown monitoring circuit was electrically connected is the second relay for the first relay, another relay.
During detection, corresponding first luminous power is obtained by calculating after sample point obtains the first sampled voltage, if
For first luminous power in first threshold scope, the first relay is high level at this time, and the second relay is high level, and the AD turns
Parallel operation is connected with the first detection circuit, and according to pre-set interval, sampled point is carried out using a/d converter to wait the time
Interval sampling, obtains the second sampled voltage.
Calculated using the second sampled voltage and obtain luminous power, if second luminous power is more than the first threshold scope
The upper limit, and when being located at second threshold scope, the first relay is low level at this time, and the second relay is high level, the AD
Converter is switched to by the first relay and is connected with the second detection circuit, and a/d converter continues according to predetermined interval to sampled point
Voltage carry out constant duration sampling, obtain the 3rd sampled voltage.
Calculated using the 3rd sampled voltage and obtain the 3rd luminous power, if the 3rd luminous power is more than the second threshold
The upper limit of scope, and when being located at three threshold ranges, the first relay are low level, and the second relay is low level, the AD
Converter is switched to by the second relay and is connected with three testing circuit.
Specifically, if the first luminous power in the range of -30~-10dBm, i.e. the first luminous power is located at first threshold model
When enclosing, the a/d converter is connected with the first detection circuit, and then obtains the second sampled voltage.With the increase of luminous power,
It is when the upper limit of corresponding second luminous power of the second sampled voltage that a/d converter obtains more than the first threshold scope, i.e., big
When -10dBm, the first relay is adjusted to low level, and a/d converter is switched to and is connected with the second detection circuit.
The a/d converter continues sampling and obtains the 3rd sampled voltage, calculates and obtains the 3rd luminous power, with luminous power
Increase, if the 3rd luminous power is more than the upper limit of the second threshold scope, that is, when being more than+10dBm, second relay
Device is adjusted to low level, and a/d converter is switched to and is connected with three testing circuit, and then obtains the 4th sampled voltage.
Similar, if the first luminous power in the range of -10~+10dBm, i.e. the first luminous power is located at second threshold model
When enclosing interior, the a/d converter is connected with the second detection circuit, when luminous power is gradually increased to more than 10dBm, first after
Electric appliance is adjusted to low level, and the second relay is adjusted to low level so that and the a/d converter is connected with three testing circuit, or
Person,
If luminous power is gradually decrease to be less than -10dBm, the first relay is adjusted to high level, and the second relay is adjusted to
High level, makes the a/d converter be connected with the first detection circuit.
In addition, similar to embodiment one, two adjacent threshold ranges also likely to be present part weight in detection process
Between the region of conjunction, such as first threshold scope and second threshold scope or second threshold scope and the 3rd threshold range it
Between there is a situation where to partially overlap.If the first initial sampled voltage is not overlapping area by calculating the first luminous power obtained
In domain, then detection mode need not make adjustment, i.e., which threshold range is the first luminous power be located at, and just use the threshold range
Corresponding detection circuit is detected.
If the first luminous power is located in overlapping region, detection mode needs to be adjusted correspondingly.It is for example, false
If there are overlapping region between first threshold scope and second threshold scope in the present embodiment, when the first sampling electricity by acquisition
When the first luminous power that pressure calculates acquisition is located at overlapping region, examined using corresponding first detection circuit of first threshold scope
Survey, i.e., using in the two adjacent threshold ranges, corresponding less one of reference optical power.
If there are overlapping region between second threshold scope and the 3rd threshold range, when the first sampling by acquisition
Voltage calculates the first luminous power obtained when being located at the overlapping region, using corresponding second detection circuit of second threshold scope into
Row detection, i.e., used in the two adjacent threshold ranges, corresponding less one of reference optical power.
It is similar to embodiment one, when the presence of overlapping region can be to avoid switching between adjacent thresholds scope
Caused unstable state, reduces the error of luminous power detection.
The sampled voltage obtained by a/d converter needs according to default mode calculate to obtain corresponding luminous power,
The calculation formula of luminous power is in optical-fibre communications：
P0=A+10log (V/ (K*R))；
Wherein, P0For luminous power, A is the loss in light path, such as the loss of splitter etc., generally 20dBm, K are to adopt
The current coefficient of PIN pipes during sample, it is sampled voltage that 0.95, V is taken in embodiment one, and R is the resistance in detection circuit.With
Exemplified by calculating luminous power by the first sampled voltage, P0 is the first luminous power, and A is the loss in light path, and K is used when sampling
The current coefficient of PIN pipes, V are the first sampled voltage, and R is the first resistor R201 in the first detection circuit.
Wherein, R is and the corresponding resistance of detection circuit, in the present embodiment, first detection circuit corresponding the
One resistance R201=3.5M Ohm, the corresponding second resistance R202=35KOhm of the second detection circuit, three testing circuit correspond to
3rd resistor R203=360Ohm.Certainly, it is suitable to be selected in use according to the reference optical power for being actually subjected to detection
Resistance R, do not do excessive restriction herein.
Illustrate and the calculating process of above-mentioned formula is illustrated.
When luminous power is located at first threshold scope, when being -30~-10dBm, the first relay, the equal position of the second relay
In high level, a/d converter is connected with the first detection circuit, the first resistor R201=3.5M Ohm in the first detection circuit, this
Shi You：
As voltage V=30mV, P0=20+10log (30/ (0.95*3500000))=- 30.43dBm；
As voltage V=3300mV, P0=20+10log (3300/ (0.95*3500000))=- 10.03dBm.
When luminous power is located at second threshold scope, when being -10~+10dBm, the first relay is low level, second after
Electric appliance is high level, and a/d converter is connected with the second detection circuit, the second detection resistance R202=in the second detection circuit
35KOhm, has at this time：
As voltage V=30mV, P0=20+10log (30/ (0.95*35000))=- 10.43dBm；
As voltage V=3300mV, P0=20+10log (3300/ (0.95*35000))=10.03dBm.
When luminous power is located at the 3rd threshold range, when being+10~30dBm, the first relay, the second relay are low
Level, a/d converter are connected with three testing circuit, the 3rd detection resistance R203=360Ohm in three testing circuit, at this time
Have：
As voltage V=30mV, P0=20+10log (30/ (0.95*360))=9.43dBm,
As voltage V=3300mV, P0=20+10log (3300/ (0.95*360))=29.84dBm.
Above-mentioned theory calculating is simply illustrative to the calculating process of formula on the premise of given voltage, due to
There is certain error in actual circuit, can be by being modified respectively to the circuit of three different ranges in application process
Method, ensures that detection range is more than the reference optical power that each circuit is covered, i.e., so that actually detected scope meets luminous power
Range requirement, to ensure the accuracy of large-scale luminous power testing result.
The present embodiment further expands reference optical power that can be detected on the basis of embodiment one, 0~
It can be detected in the range of 60dBm, meanwhile, the scheme of the present embodiment is simple, is easy to produce in batches, while the member used
Device is less, can also save production cost, be it is a kind of can be widely applied to light open the light product luminous power detection method.
Those skilled in the art will readily occur to the present invention its after considering specification and putting into practice invention disclosed herein
Its embodiment.The present application is intended to any variations, uses, or adaptations of the present invention, these modifications, use
Way or adaptive change follow the general principle of the present invention and including undocumented in the art known of the invention
General knowledge or conventional techniques.Description and embodiments are considered only as exemplary, and the scope of the present invention is only by appended right
It is required that to limit.
Claims (10)
- A kind of 1. luminous power detection method, it is characterised in that the described method includes：The first sampled voltage is obtained in sample point；Calculated using the first sampled voltage and obtain the first luminous power；According to pre-set interval, using the first detection circuit corresponding to the first threshold scope belonging to the first luminous power, Constant duration sampling is carried out to the voltage of the sampled point, obtains the second sampled voltage；Calculated using the second sampled voltage and obtain the second luminous power；If the second luminous power is more than the upper limit of the first threshold scope, the second threshold scope belonging to the second luminous power is used The second corresponding detection circuit, carries out constant duration sampling to the voltage of the sampled point, obtains the 3rd sampled voltage；Its In, first detection circuit is different detection circuits from second detection circuit；Calculated using the 3rd sampled voltage and obtain the 3rd luminous power.
- 2. luminous power detection method according to claim 1, it is characterised in that：If the 3rd luminous power being calculated using the 3rd sampled voltage is more than the upper limit of the second threshold scope, the is used The three testing circuit corresponding to the 3rd threshold range belonging to three luminous powers, carrying out waiting the time the voltage of the sampled point Every sampling, the 4th sampled voltage is obtained.
- 3. luminous power detection method according to claim 2, it is characterised in that：3rd threshold range is identical with first threshold scope, and three testing circuit and the first detection circuit are same detection Circuit.
- 4. luminous power detection method according to claim 2, it is characterised in that obtain the first sampling electricity in sample point Pressure, including：First sampled voltage of the sampled point is obtained by a/d converter；The first threshold scope, second threshold scope or the 3rd threshold range are in the sampling electricity of the single a/d converter Press in corresponding reference optical power.
- 5. luminous power detection method according to claim 4, it is characterised in that use the first threshold belonging to the first luminous power It is worth the first detection circuit corresponding to scope, including：When the first luminous power is in first threshold scope, the a/d converter is connected with the first detection circuit.
- 6. luminous power detection method according to claim 5, it is characterised in that use the second threshold belonging to the second luminous power It is worth the second detection circuit corresponding to scope, includingWhen the second luminous power is more than the upper limit of the first threshold scope, and is located at second threshold scope, the a/d converter It is connected by relay and the second detection circuit.
- 7. luminous power detection method according to any one of claims 1 to 6, it is characterised in that：Exist between the first threshold scope and the second threshold scope and partially overlap.
- 8. luminous power detection method according to claim 7, it is characterised in that：The first threshold scope is, in each threshold range belonging to first luminous power, luminous power corresponding to endpoint is minimum One.
- 9. luminous power detection method according to claim 2, its characteristic are：Exist between the second threshold scope and the 3rd threshold range and partially overlap.
- 10. luminous power detection method according to claim 1, it is characterised in thatCalculated using the first sampled voltage and obtain the first luminous power, including,P0=A+10log (V/ (K*R))；Wherein, P0For the first luminous power, A is the loss in light path, and K is the current coefficient of PIN pipes when sampling, and V adopts for first Sample voltage, R are the resistance in the first detection circuit.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203364966U (en) * | 2013-07-30 | 2013-12-25 | 武汉理工大学 | High-precision and high-sensitivity optical power meter with large dynamic range |
| WO2016106544A1 (en) * | 2014-12-30 | 2016-07-07 | 华为技术有限公司 | Analog-to-digital converter protection circuit and control method thereof, and controller |
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2017
- 2017-11-21 CN CN201711162136.2A patent/CN108007565A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203364966U (en) * | 2013-07-30 | 2013-12-25 | 武汉理工大学 | High-precision and high-sensitivity optical power meter with large dynamic range |
| WO2016106544A1 (en) * | 2014-12-30 | 2016-07-07 | 华为技术有限公司 | Analog-to-digital converter protection circuit and control method thereof, and controller |
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| 周航慈等: "《智能仪器原理与设计》", 31 March 2005 * |
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