CN102138799B - Wavelength compensation methods for high-accuracy blood oxygen probe - Google Patents
Wavelength compensation methods for high-accuracy blood oxygen probe Download PDFInfo
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- CN102138799B CN102138799B CN 201010104542 CN201010104542A CN102138799B CN 102138799 B CN102138799 B CN 102138799B CN 201010104542 CN201010104542 CN 201010104542 CN 201010104542 A CN201010104542 A CN 201010104542A CN 102138799 B CN102138799 B CN 102138799B
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Abstract
The invention discloses a wavelength compensation method for a high-accuracy blood oxygen probe. The wavelength compensation method comprises the following steps of: a, supplying a constant current to a light emitting diode in the blood oxygen probe; b, previously testing change of forward voltage drop of the light emitting diode in the blood oxygen probe at different environmental temperatures respectively and establishing one-to-one correspondence among the current, the environmental temperature and the forward voltage drop of the light emitting diode; and c, testing the forward voltage drop of the light emitting diode and acquiring environmental temperature data through the correspondence established in the step b to realize environmental temperature detection. Apart from the steps, the wavelength compensation method for the high-accuracy blood oxygen probe also comprises the following step of: d, calculating variation in wavelength by detecting the variation of forward voltage of the light emitting diode in the high-accuracy blood oxygen probe so as to realize compensation of the wavelength of the high-accuracy blood oxygen probe. By implementing the methods, the wavelength compensation of the blood oxygen probe can be realized; and the entire scheme is low in implementation cost.
Description
Technical field
The present invention relates to a kind of method for wavelength compensation, especially relate to a kind of high accuracy blood oxygen probe method for wavelength compensation.
Background technology
Pulse blood oxygen instrument is mainly used in measuring the speciality that changes blood flow, comprises pulse frequency of arterial oxygen saturation, heart etc.The measurement of these speciality can realize by a noninvasive blood oxygen probe.The part that the light that sends by probe penetrates human body has the tissue of blood perfusion, and pulse blood oxygen instrument calculates the various speciality of blood flow according to the absorbtivity of light then, such as, arterial oxygen saturation.For the arterial oxygen saturation of the tissue of measuring human body, probe needs the light (red-light LED and infrared light LED) of two kinds of different wavelength to satisfy the calculation requirement of pulse blood oxygen instrument.Therefore, the computational accuracy of blood oxygen saturation just depends on known LED wavelength.Yet the wavelength of each LED is not quite similar, even same LED wavelength also is to change in varying environment, different period, and wavelength shift takes place.Therefore, the meeting of the computational accuracy of pulse blood oxygen instrument blood oxygen saturation is owing to the skew of the wavelength of blood oxygen probe produces certain error.For the difference of blood oxygen probe wavelength, main a solution is exactly to increase an identification resistance at probe, and this identification resistance is mainly used to distinguish the corresponding wavelength of probe.Pulse blood oxygen instrument when work, detect the value of this resistance earlier, the wavelength value that adopts when deciding blood oxygen saturation to calculate according to the value of resistance then, this method makes manufacturer need not spend the expensive LED that can filter out unique wavelength.Yet, though identification resistance can make blood oxygen probe no longer be confined to a single wavelength value, but the wavelength of blood oxygen probe is being measured when using and can changed with the difference of factors such as probe drive current, ambient temperature, therefore, this method can not solve the problem of blood oxygen wavelength variations fully.Because the skew of wavelength mainly is because the variation of ambient temperature is caused during blood oxygen probe work, therefore, contingent wavelength shift when the present invention is primarily aimed at blood oxygen probe work, utilize relation between ambient temperature, voltage, the wavelength three to realize real-Time Compensation to the blood oxygen probe wavelength, thereby remedy probe causes measurement error because of wavelength variations defective.
Summary of the invention
Technical problem to be solved by this invention is that a kind of high accuracy blood oxygen probe method for wavelength compensation is provided.
For solving above technical problem, the present invention realizes that the technical scheme of wavelength compensation is: a kind of high accuracy blood oxygen probe method for wavelength compensation, key is: comprise the steps:
A, give the light emitting diode that arranges in the described blood oxygen probe by a constant current;
B, in advance under the varying environment temperature, test the variation of the light emitting diode forward voltage drop that arranges in the described blood oxygen probe respectively, and set up the one-to-one relationship between ambient temperature and the described light emitting diode forward voltage drop;
The forward voltage drop of c, the described light emitting diode of test, and by the corresponding relation that above-mentioned b step is set up, obtain ambient temperature data, realize the detection to ambient temperature;
The variable quantity that d, utilization detect described high accuracy blood oxygen probe positive voltage of light emitting diode calculates the wavelength change amount, thereby realizes the compensation to the blood oxygen probe wavelength.
As the improvement of the above method for wavelength compensation technical scheme of the present invention, described d step specifically comprises the steps:
D1, utilize the characteristic of diode, under different ambient temperatures, the spike of described light emitting diode forward voltage drop and the described light emitting diode variation relation between long is set up in the variation of the forward voltage drop by testing described light emitting diode;
In the d2, the operating temperature range of will popping one's head under the varying environment temperature spike long number value of corresponding described light emitting diode be stored in the memory chip in the probe plug, call during the work of blood supply oxygen instrument;
When d3, probe work, by the testing circuit on the blood oxygen instrument, detect the variable quantity of the forward voltage drop of described light emitting diode, then according to the variation relation formula in the memory chip, convert described light emitting diode wavelength change amount to and readjust the spike long value of described light emitting diode, thereby realize the purpose to the long real-Time Compensation of described high accuracy blood oxygen probe spike.
Further improve as the above method for wavelength compensation technical scheme of the present invention, between described b step and c step, also comprise the b1 step: turn back to described b step after namely changing the constant current value in the described a step; Set up the one-to-one relationship between the ambient temperature and described light emitting diode forward voltage drop under the different constant current value after the limited number of time circulation by b1 step and b step.
The light source of high accuracy blood oxygen probe of the present invention is light emitting diode, and the power consumption major part changes into heat during light emitting diode work, has only small part to convert luminous energy to, forms luminescence phenomenon.By different electric currents, the PN junction of LED will produce different heats; When making LED pass through constant current, the PN junction temperature of LED will be with variation of ambient temperature.
According to the principle of luminosity of LED as can be known, the LED wavelength mainly is to be determined by the energy bandwidth (Eg) between its PN junction, and the height of the size of Eg and PN junction temperature has direct relation.Therefore, the LED variation of temperature has directly determined the LED wavelength change.
Yet the temperature survey of probe LED during work is difficulty relatively, can measure by temperature sensor certainly, but this must significantly increase the cost of blood oxygen probe.Therefore need to seek another parameter and weigh the variation of temperature situation.We know that in fact the LED of blood oxygen probe is exactly a semiconductor diode, and a characteristic of semiconductor diode is exactly, ambient temperature has direct relation to the forward voltage of diode, and therefore, we can utilize this characteristic of diode realize popping one's head in compensation of wavelength.
Obviously, realize that by implementing the present invention the technical scheme of temperature detection can realize the temperature detection to high accuracy blood oxygen probe of the present invention; By implementing the technical scheme of realization wavelength compensation of the present invention, then can finally realize the wavelength compensation to high accuracy blood oxygen probe of the present invention, realize that namely to high accuracy blood oxygen probe of the present invention wavelength shift revises, reduces the beneficial effect of the pulse blood oxygen test error that causes because of wavelength shift, guarantee the certainty of measurement requirement of high accuracy blood oxygen probe, and whole with low cost.
In addition, set up the corresponding relation of electric current, temperature, forward voltage drop and wavelength by the method step that changes constant current value, can be under the situation of selected a certain constant current value, by detecting the forward voltage drop of light emitting diode, obtain temperature data and the wavelength variation data of probe, and can take measures wavelength is compensated.
Description of drawings
Below in conjunction with Figure of description the present invention is done further detailed description, wherein:
Fig. 1 is system construction drawing of the present invention.
The specific embodiment
As shown in Figure 1, a kind of high accuracy blood oxygen probe, comprise the probe, cable and the plug that connect successively mutually, in described high accuracy blood oxygen probe, also be provided with the memory for digits chip, described memory for digits chip is arranged on the described plug, and described memory for digits chip can be storage chip, flash chip or read-only chip able to programme at random.Be provided with red-light LED and infrared light LED in the described probe.
Can realize temperature detection to the PN junction of red-light LED and/or infrared light LED by implementing following steps:
A, give the light emitting diode that arranges in the described blood oxygen probe by a constant current;
B, in advance under the varying environment temperature, test the variation of the light emitting diode forward voltage drop that arranges in the described blood oxygen probe respectively, and set up the one-to-one relationship between ambient temperature and the described light emitting diode forward voltage drop;
The forward voltage drop of c, the described light emitting diode of test, and by the corresponding relation that above-mentioned b step is set up, obtain ambient temperature data, realize the detection to ambient temperature.
In view of the LED wavelength mainly is to be determined by the energy bandwidth (Eg) between its PN junction, and the height of the size of Eg and PN junction temperature has direct relation.Therefore, the LED variation of temperature has directly determined the LED wavelength change, so then can realize compensation to described high accuracy blood oxygen probe wavelength by following steps:
A, give the light emitting diode that arranges in the described blood oxygen probe by a constant current;
B, in advance under the varying environment temperature, test the variation of the light emitting diode forward voltage drop that arranges in the described blood oxygen probe respectively, and set up the one-to-one relationship between ambient temperature and the described light emitting diode forward voltage drop;
The forward voltage drop of c, the described light emitting diode of test, and by the corresponding relation that above-mentioned b step is set up, obtain ambient temperature data, realize the detection to ambient temperature;
The variable quantity that d, utilization detect described high accuracy blood oxygen probe positive voltage of light emitting diode calculates the wavelength change amount, thereby realizes the compensation to described high accuracy blood oxygen probe wavelength.
Wherein said d step specifically comprises the steps:
D1, utilize the characteristic of diode, under different ambient temperatures, the spike of described light emitting diode forward voltage drop and the described light emitting diode variation relation between long is set up in the variation of the forward voltage drop by testing described light emitting diode;
In the d2, the operating temperature range of will popping one's head under the varying environment temperature spike long number value of corresponding described light emitting diode be stored in the memory chip in the probe plug, call during the work of blood supply oxygen instrument;
When d3, probe work, by the testing circuit on the blood oxygen instrument, detect the variable quantity of the forward voltage drop of described light emitting diode, then according to the variation relation formula in the memory chip, convert described light emitting diode wavelength change amount to and readjust the spike long value of described light emitting diode, thereby realize the purpose to the long real-Time Compensation of described high accuracy blood oxygen probe spike.
In addition, between described b step and c step, also comprise the b1 step: turn back to described b step after namely changing the constant current value in the described a step; Set up the one-to-one relationship between the ambient temperature and described light emitting diode forward voltage drop under the different constant current value after the limited number of time circulation by b1 step and b step.
Can set up under the different constant current value of a cover by implementing above technical scheme, different forward voltage drop situations following different one to one temperature and wavelength variation data, thereby can finally realize the compensation to the LED wavelength, for the accurate detection of high accuracy blood oxygen probe of the present invention provides condition.
Must be pointed out that some indefinitenesses that above-described embodiment is just made the present invention illustrate.But person of skill in the art will appreciate that, do not departing under aim of the present invention and the scope that can make modification to the present invention, replace and change, these modifications, replacement and change still belong to protection scope of the present invention.
Claims (3)
1. a high accuracy blood oxygen probe method for wavelength compensation is characterized in that: comprise the steps:
A, give the light emitting diode that arranges in the described blood oxygen probe by a constant current;
B, in advance under the varying environment temperature, test the variation of the light emitting diode forward voltage drop that arranges in the described blood oxygen probe respectively, and set up the one-to-one relationship between electric current, ambient temperature and the described light emitting diode forward voltage drop;
The forward voltage drop of c, the described light emitting diode of test, and by the corresponding relation that above-mentioned b step is set up, obtain ambient temperature data, realize the detection to ambient temperature;
The variable quantity that d, utilization detect described high accuracy blood oxygen probe positive voltage of light emitting diode calculates the wavelength change amount, thereby realizes the compensation to described high accuracy blood oxygen probe wavelength.
2. a kind of high accuracy blood oxygen probe method for wavelength compensation according to claim 1, it is characterized in that: described d step specifically comprises the steps:
D1, utilize the characteristic of diode, under different ambient temperatures, the spike of described light emitting diode forward voltage drop and the described light emitting diode variation relation between long is set up in the variation of the forward voltage drop by testing described light emitting diode;
In the d2, the operating temperature range of will popping one's head under the varying environment temperature spike long number value of corresponding described light emitting diode be stored in the memory chip in the probe plug, call during the work of blood supply oxygen instrument;
When d3, probe work, by the testing circuit on the blood oxygen instrument, detect the variable quantity of the forward voltage drop of described light emitting diode, then according to the variation relation formula in the memory chip, convert described light emitting diode wavelength change amount to and readjust the spike long value of described light emitting diode, thereby realize the purpose to the long real-Time Compensation of described high accuracy blood oxygen probe spike.
3. according to claim 1 or 2 described a kind of high accuracy blood oxygen probe method for wavelength compensation, it is characterized in that: comprise the steps:
Between described b step and c step, also comprise the b1 step: turn back to described b step after namely changing the constant current value in the described a step; Set up the one-to-one relationship between the ambient temperature and described light emitting diode forward voltage drop under the different constant current value after the limited number of time circulation by b1 step and b step.
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| CN102879691B (en) * | 2012-10-16 | 2014-08-20 | 深圳市理邦精密仪器股份有限公司 | Method and device for automatically detecting failure of blood oxygen probe |
| CN111854937B (en) * | 2020-07-02 | 2023-11-17 | 成都维客昕微电子有限公司 | Detection method for light in specific wavelength range based on LEDs with different light emitting wavelengths |
| CN114931377A (en) * | 2022-05-20 | 2022-08-23 | 歌尔股份有限公司 | Blood oxygen concentration detection device and wearable equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1638586A (en) * | 2003-10-21 | 2005-07-13 | 罗姆股份有限公司 | Light emission control apparatus and light emission control method with temperature-sensitive driving current control |
| CN200953671Y (en) * | 2006-03-08 | 2007-09-26 | 崇贸科技股份有限公司 | Light-emitting diode driving circuit with temperature compensation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1638586A (en) * | 2003-10-21 | 2005-07-13 | 罗姆股份有限公司 | Light emission control apparatus and light emission control method with temperature-sensitive driving current control |
| CN200953671Y (en) * | 2006-03-08 | 2007-09-26 | 崇贸科技股份有限公司 | Light-emitting diode driving circuit with temperature compensation |
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Address after: 3, building 1, building 18, Arts crafts emporium, No. 518067, Shun Shan Road, Shekou, Guangdong, Shenzhen, Nanshan District Patentee after: Shenzhen Solaris Medical Technology Inc. Address before: 6, building 9, building 30, 518057, science Road, Nanshan District science and Technology Industrial Park, Shenzhen, Guangdong Patentee before: Shenzhen Solaris Medical Technology Inc. |