CN102109377A - Method for adjusting signal intensity and equipment - Google Patents
Method for adjusting signal intensity and equipment Download PDFInfo
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- CN102109377A CN102109377A CN2009103121276A CN200910312127A CN102109377A CN 102109377 A CN102109377 A CN 102109377A CN 2009103121276 A CN2009103121276 A CN 2009103121276A CN 200910312127 A CN200910312127 A CN 200910312127A CN 102109377 A CN102109377 A CN 102109377A
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Abstract
The invention discloses a method for adjusting signal intensity and equipment. The invention aims to provide a method for adjusting signal intensity and equipment, which can realize the signal intensity adjustment through the matching of automatic gain adjustment and automatic slit adjustment, so that all spectrum sections have higher signal-to-noise ratios. A slit is set at the light spectrum bandwidth position required by a user; the gain adjustment range of an automatic gain adjustment system is set as 1-100; the automatic gain adjustment system is used for detecting the energy value received by a light receiver at present, amplifying the energy value, and transmitting the energy value into an adjustment controller; the adjustment controller is used for judging whether the energy value is lower than or higher than the set threshold value, a control command is outputted to the automatic gain adjustment system to change the overall gain value until the converted energy reaches the threshold value standard; and if the gain value reaches the maximum value, and the converted energy can not reach the threshold value standard, the signal intensity adjustment controller outputs a control command to control a slit servo motor to drive the slit to be opened until the converted energy reaches the thresholds value range.
Description
Technical field
The present invention relates to optical instrument field, in particular, relate to a kind of method and automatic gain and automatic servo integrated system of slit that is used for the conditioning signal intensity of ultraviolet near infrared spectrometer.
Background technology
The wavelength scanning range of ultraviolet near infrared spectrometer is 175-3300nm, in the near-infrared region of 860-3300nm because this spectrophotometer uses double monochromator, and light path is longer, spectrum that light source sends is bigger in nearly red wave band energy difference, it is also inhomogeneous to add the sensitivity in this scope of vulcanized lead receiver, for making higher-energy place and more low-yield place all can obtain comparatively desirable absorbance spectral line, therefore just need carry out real-Time Compensation to the overall sensitivity of instrument.Traditional simple automatic gain compensation mode exists significant limitation, and the conference that gained makes that noise enlarged markedly when signal strengthened, and signal to noise ratio (S/N ratio) reduces; And it is low to gain, and back level system is introduced the noise showed increased, reduces signal to noise ratio (S/N ratio) equally.
Summary of the invention
The present invention is in order to overcome weak point of the prior art, to provide a kind of and adjust the incompatible realization conditioning signal intensity that matches automatically by Gain Automatic adjustment and slit, making full spectral coverage that the method for the conditioning signal intensity of higher signal to noise ratio (S/N ratio) all be arranged.
Another object of the present invention provides a kind of employed automatic gain of method and automatic servo integrated system of slit of conditioning signal intensity.
The present invention is achieved through the following technical solutions:
A kind of control method of signal intensity is characterized in that, comprises the steps:
(1) slit is set in the spectral bandwidth position that the user needs;
(2) gain adjustment range with the automatic gain Adjustment System is set at 1-100;
(3) the automatic gain Adjustment System detects the energy value of the current reception of optical receiver, after amplifying, deliver to adjustment control, if adjustment control judges that energy value is below or above preset threshold, then export steering order and change the overall gain value for the automatic gain Adjustment System, reach threshold criteria up to energy after conversion;
(4) if gain when having reached maximal value, energy after conversion can not reach threshold criteria, and then signal intensity adjustment controller output steering order control slit servomotor drive slit is opened, and reaches threshold criteria up to energy after conversion.
Employed automatic gain of a kind of control method of signal intensity and the automatic servo integrated system of slit, comprise light path, optical receiver, the automatic gain Adjustment System, amplifying circuit, adjustment control, described light path, optical receiver sets gradually, the output terminal of described optical receiver is connected with the signal input part of automatic gain Adjustment System, the signal output part of described automatic gain Adjustment System is connected with the signal input part of amplifying circuit, the signal output part of described amplifying circuit is connected with the signal input part of adjustment control, the gain control signal output terminal of described adjustment control is connected with the signal input end of described automatic gain Adjustment System, it is characterized in that, slit mechanism in the described light path comprises slit plate, be connected with adjustable plate by rotation axis on the described slit plate, one end of described adjustable plate cooperates rotation with cam, described cam is connected with the output shaft of stepper motor, be set side by side with light entrance on the described slit plate, light gateway and light exit, last seam horse is provided with the first inlet seam sheet corresponding with light entrance, break joint sheet in corresponding with the light gateway first, the first outlet seam sheet corresponding with light exit, following seam horse is provided with the second inlet seam sheet corresponding with light entrance, break joint sheet in corresponding with the light gateway second, the second outlet seam sheet corresponding with light exit, the described first inlet seam sheet and the second inlet seam sheet cooperation form entrance slit, break joint sheet cooperation formation middle slit in the break joint sheet and second in described first, the described first outlet seam sheet cooperates the formation exit slit with the second outlet seam sheet, described entrance slit is identical with the exit slit width, the width of described middle slit is greater than the width of described entrance slit and exit slit, the described seam horse of going up is fixedlyed connected with described adjustable plate respectively with following seam horse, described cam is connected with the output shaft of slit servomotor, and the slit control signal output ends of described adjustment control is connected with the signal input end of slit servomotor.
On slit plate, be fixed with support, on stitch horse shell fragment one end and be connected with last seam horse, the other end is connected with described support, following seam horse shell fragment one end is connected with following seam horse, the other end is connected with described support, loam cake is connected with described support.
Be fixed with web joint on the described adjustable plate, with the corresponding position of described cam bearing be installed on the described web joint.
The present invention has following technique effect:
Method of the present invention is by automatic gain and the servo intensity that combines the adjustment signal of automatic slit, full spectral coverage energy range all can be dropped in the given threshold range, to reach full spectral coverage higher signal to noise ratio (S/N ratio) be arranged all, range of adjustment is wide, adaptability is strong, the signal to noise ratio (S/N ratio) height.
In the equipment of the present invention, slit mechanism is the automatic servo form, and is simple in structure, easy to adjust.
Description of drawings
Fig. 1 is automatic gain of the present invention and the automatic servo integrated systematic schematic diagram of slit;
Fig. 2 is the synoptic diagram of slit mechanism among the present invention;
Fig. 3 removes the rear view of bonnet for slit mechanism;
Fig. 4 is the cut-open view of slit mechanism.
Embodiment
Below in conjunction with specific embodiment to the detailed description of the invention.
The control method of signal intensity of the present invention comprises the steps:
(1) slit is set in the spectral bandwidth position that the user needs.
(2) gain adjustment range with the automatic gain Adjustment System is set at 1-100.
(3) the automatic gain Adjustment System detects the energy value of the current reception of optical receiver, after amplifying, deliver to adjustment control, if adjustment control judges that energy value is below or above preset threshold, then export steering order and change the overall gain value for the automatic gain Adjustment System, reach threshold criteria up to energy after conversion.
(4) if gain when having reached maximal value, energy after conversion can not reach threshold criteria, and then signal intensity adjustment controller output steering order control slit servomotor drive slit is opened, and reaches threshold criteria up to energy after conversion.
Automatic gain of the present invention and the automatic servo integrated systematic schematic diagram of slit are as shown in Figure 1, comprise light path, optical receiver, the automatic gain Adjustment System, amplifying circuit, adjustment control, described light path, optical receiver sets gradually, the output terminal of described optical receiver is connected with the signal input part of automatic gain Adjustment System, the signal output part of described automatic gain Adjustment System is connected with the signal input part of amplifying circuit, the signal output part of described amplifying circuit is connected with the signal input part of adjustment control, the gain control signal output terminal of described adjustment control is connected with the signal input end of described automatic gain Adjustment System, the synoptic diagram of the slit mechanism in the described light path such as Fig. 2 are to shown in Figure 4, comprise slit plate 2, be connected with adjustable plate 8 by rotation axis 7 on the slit plate 2, one end of adjustable plate 8 cooperates rotation with cam 1, and cam 1 is connected with the output shaft of stepper motor 12.Be set side by side with light entrance 5 on the slit plate 2, light gateway 4 and light exit 3, last seam horse 21 is provided with the first inlet seam sheet 13 corresponding with light entrance 5, break joint sheet 15 in corresponding with light gateway 4 first, the first outlet seam sheet 17 corresponding with light exit 3, following seam horse 23 is provided with the second inlet seam sheet 14 corresponding with light entrance 5, break joint sheet 16 in corresponding with light gateway 4 second, the second outlet seam sheet 18 corresponding with light exit 3, the first inlet seam sheet 13 and 14 cooperations of the second inlet seam sheet form entrance slit, break joint sheet 16 cooperation formation middle slit in the break joint sheet 15 and second in first, the first outlet seam sheet 17 and second outlet are stitched sheet 18 and are cooperated the formation exit slit.Wherein, entrance slit is identical with the exit slit width, and the width of middle slit is greater than the width of entrance slit and exit slit.Last seam horse 21 is connected with adjustable plate 8 by pin 6, and following seam horse 23 is connected with adjustable plate 8 by pin 9.Described cam is connected with the output shaft of slit servomotor, and the slit control signal output ends of described adjustment control is connected with the signal input end of slit servomotor.
In order to reduce the friction of cam, on adjustable plate 8, be fixed with web joint 11, with cam 1 corresponding position bearing 10 is installed on the web joint 11.
In order to make bearing and cam keep closely contacting, on slit plate 2, be fixed with support 22, on stitch horse shell fragment 20 1 ends and be connected with last seam horse 21, the other end is connected with support 22.Following seam horse shell fragment 19 1 ends are connected with following seam horse 23, and the other end is connected with support 22, and loam cake 24 is connected with support 22.
At first slit is set in the spectral bandwidth position that the user needs (since slit width influence spectral bandwidth the servo situation that can satisfy energy requirement that gains under should try one's best do not change slit location), then by the current energy value that receives of sample detecting, if judge that by MCU energy value is below or above preset threshold, then signal intensity is adjusted controller and is sent the resistance that instruction changes digital regulation resistance to AD5290, AD5290 is the feedback resistance of an inverse proportion amplifier, by regulate this resistance just can change the gain Adjustment System the overall gain value, reach threshold criteria up to the energy after conversion value, but it is to be noted that the gain margin of gain Adjustment System can not infinitely increase, the too high meeting that gains makes receiver noise obtain corresponding gain too and signal to noise ratio (S/N ratio) is reduced, until detecting energy signal, our given gain adjustment range is 1-100, energy does not still have and can not satisfy the demand when gain has reached maximal value, and the controller of signal intensity adjustment at this moment can send instruction to the slit servo-drive system and suitably be opened to improve energy by slit motor drive slit.The most complete spectral coverage energy range all drops in the given threshold range, to reach full spectral coverage higher signal to noise ratio (S/N ratio) is arranged all.
The process of slit adjustment is: slit motor drives cam rotation, the cam driven adjustable plate serves as that axle rotates with rotation axis 7, thereby seam horse and following seam horse move in the drive, break joint sheet, the second outlet seam sheet be respectively to opposite oppositely mobile in the second inlet seam sheet, second on break joint sheet in the first inlet seam sheet, first on the last seam horse, the first outlet seam sheet and the following seam horse, thereby adjusting respective slit width diminishes or becomes big.Middle slit is both as the exit slit of first monochromator, again as the entrance slit of second monochromator.
Claims (4)
1. the control method of a signal intensity is characterized in that, comprises the steps:
(1) slit is set in the spectral bandwidth position that the user needs;
(2) gain adjustment range with the automatic gain Adjustment System is set at 1-100;
(3) the automatic gain Adjustment System detects the energy value of the current reception of optical receiver, after amplifying, deliver to adjustment control, if adjustment control judges that energy value is below or above preset threshold, then export steering order and change the overall gain value for the automatic gain Adjustment System, reach threshold criteria up to energy after conversion;
(4) if gain when having reached maximal value, energy after conversion can not reach threshold criteria, and then signal intensity adjustment controller output steering order control slit servomotor drive slit is opened, and reaches threshold criteria up to energy after conversion.
2. employed automatic gain of the control method of the described signal intensity of claim 1 and the servo integrated system of slit automatically, comprise light path, optical receiver, the automatic gain Adjustment System, amplifying circuit, adjustment control, described light path, optical receiver sets gradually, the output terminal of described optical receiver is connected with the signal input part of automatic gain Adjustment System, the signal output part of described automatic gain Adjustment System is connected with the signal input part of amplifying circuit, the signal output part of described amplifying circuit is connected with the signal input part of adjustment control, the gain control signal output terminal of described adjustment control is connected with the signal input end of described automatic gain Adjustment System, it is characterized in that, slit mechanism in the described light path comprises slit plate, be connected with adjustable plate by rotation axis on the described slit plate, one end of described adjustable plate cooperates rotation with cam, described cam is connected with the output shaft of stepper motor, be set side by side with light entrance on the described slit plate, light gateway and light exit, last seam horse is provided with the first inlet seam sheet corresponding with light entrance, break joint sheet in corresponding with the light gateway first, the first outlet seam sheet corresponding with light exit, following seam horse is provided with the second inlet seam sheet corresponding with light entrance, break joint sheet in corresponding with the light gateway second, the second outlet seam sheet corresponding with light exit, the described first inlet seam sheet and the second inlet seam sheet cooperation form entrance slit, break joint sheet cooperation formation middle slit in the break joint sheet and second in described first, the described first outlet seam sheet cooperates the formation exit slit with the second outlet seam sheet, described entrance slit is identical with the exit slit width, the width of described middle slit is greater than the width of described entrance slit and exit slit, the described seam horse of going up is fixedlyed connected with described adjustable plate respectively with following seam horse, described cam is connected with the output shaft of slit servomotor, and the slit control signal output ends of described adjustment control is connected with the signal input end of slit servomotor.
3. automatic gain according to claim 2 and the automatic servo integrated system of slit, it is characterized in that, on slit plate, be fixed with support, last seam horse shell fragment one end is connected with last seam horse, the other end is connected with described support, following seam horse shell fragment one end is connected with following seam horse, and the other end is connected with described support, and loam cake is connected with described support.
4. automatic gain according to claim 2 and the automatic servo integrated system of slit is characterized in that, are fixed with web joint on the described adjustable plate, with the corresponding position of described cam bearing are installed on the described web joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103121276A CN102109377A (en) | 2009-12-23 | 2009-12-23 | Method for adjusting signal intensity and equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103121276A CN102109377A (en) | 2009-12-23 | 2009-12-23 | Method for adjusting signal intensity and equipment |
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| CN102109377A true CN102109377A (en) | 2011-06-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104768215A (en) * | 2015-03-26 | 2015-07-08 | 上海源斌电子科技有限公司 | Automatic adjustment method and system of channel gain and applicable mobile equipment |
| CN104865331A (en) * | 2015-03-09 | 2015-08-26 | 俞嘉德 | High-performance liquid chromatography dual-purpose ultraviolet visible light and fluorescence dual-spectrum dual-detector |
| CN106841159A (en) * | 2016-12-28 | 2017-06-13 | 江苏师范大学 | Slit arrangement, micro Raman scattering melamine detection spectral device |
-
2009
- 2009-12-23 CN CN2009103121276A patent/CN102109377A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865331A (en) * | 2015-03-09 | 2015-08-26 | 俞嘉德 | High-performance liquid chromatography dual-purpose ultraviolet visible light and fluorescence dual-spectrum dual-detector |
| CN104768215A (en) * | 2015-03-26 | 2015-07-08 | 上海源斌电子科技有限公司 | Automatic adjustment method and system of channel gain and applicable mobile equipment |
| CN104768215B (en) * | 2015-03-26 | 2019-07-05 | 上海源斌电子科技有限公司 | Automatic adjustment method, system and the mobile device being applicable in of channel gain |
| CN106841159A (en) * | 2016-12-28 | 2017-06-13 | 江苏师范大学 | Slit arrangement, micro Raman scattering melamine detection spectral device |
| CN106841159B (en) * | 2016-12-28 | 2019-05-07 | 江苏师范大学 | Slit arrangement, micro Raman scattering melamine detect spectral device |
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Application publication date: 20110629 |