CN1240932A - Infrared and electronic non-contact oral thermometer - Google Patents
Infrared and electronic non-contact oral thermometer Download PDFInfo
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- CN1240932A CN1240932A CN98102733.4A CN98102733A CN1240932A CN 1240932 A CN1240932 A CN 1240932A CN 98102733 A CN98102733 A CN 98102733A CN 1240932 A CN1240932 A CN 1240932A
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- infrared light
- buccal cavity
- electronic thermometer
- light electronic
- circuit
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Abstract
An infrared and electronic non-contact oral thermometer is composed of casing, power supply, switch, and non-spherical lens for collecting infrared radiation from the body to be measured. After chopped and modulated by modulator, the collected infrared radiation is sent to detector, whose output is processed by circuit to obtain the temp of the body to be measured. Its advantages are no contact with human body and quick and correct measurement.
Description
The invention belongs to electronic thermometer, particularly a kind of contactless, Buccal Cavity Infrared Light Electronic Thermometer.
Clinical thermometer is in human health care's medicine equipment, uses the most general instrument.Because technology and price two aspects, so far also not really can with human body fully non-contiguously, measure the thermometer of body temperature apace.The clinical thermometer of the employing infrared temperature-test technology of Chu Xianing in recent years, Pro-1 auditory canal temperature meter (U.S.Patent:4 as U.S. Thermoscan company, 797,840), the MC-505 ear thermometer that also has Japanese Omron company, adopt pyroelectric detector and thermopile detector respectively, directly measured in the ear chamber and the temperature of eardrum, recorded body temperature 1～3 second.Their common ground all is temperature probe will be inserted in people's the ear acupuncture point.Therefore, concerning human body, can not be called the thermometer of " noncontact ".The said temperature meter can only be measured the object that is higher than environment temperature, and energy measurement is not lower than the object of environment temperature.
The purpose of this invention is to provide a kind of new, the clinical thermometer that contact fully with human body, a cover is new, improves the technology of contactless infrared thermometer sensitivity, signal to noise ratio (S/N ratio) and precision effectively, guaranteed this clinical thermometer accurately, reliably.
Another object of the present invention provides a kind of contactless temperature-measuring instrument that comprises medical treatment or other application, both the temperature of the target that energy measurement is higher than temperature measurer environment temperature of living in; The also temperature of the target that energy measurement is lower than temperature measurer environment temperature of living in.
Principal feature of the present invention is to comprise shell, one power supply 9 is arranged in the enclosure, switch 10 is placed on the appropriate location, also comprise the non-spherical lens 1 that converges the object infrared radiation of surveying, the infrared radiation that is converged incides on the detector 3 after modulator 2 chopping modulation, the electric signal of detector 3 outputs obtains the temperature of the object of surveying through processing of circuit.
When measuring, the present invention do not contact fully with human body, fast, accurately, and both temperature of the target that energy measurement is higher than temperature measurer environment temperature of living in; Also the temperature of the target that energy measurement is lower than temperature measurer environment temperature of living in is fit to the requirement of modern health very much.
Description of drawings
Fig. 1 is a structural representation of the present invention.
1---Infrared Lens 2---modulator 3---detector 4---pyroelectric detector-field effect transistor input circuit 5---peak-detector circuit 6---peak holding circuit 7---LCD 8---light emitting diode 9---battery 10---switch 11---measured object among the figure
Fig. 2 is a vibrator type chopping modulation device structural drawing.
21---steel disc 22---magnetic material 23---coil 24---coil 25---transistor 26---synchronizing signal outputs among the figure
Fig. 3 A is prior art pyroelectric detector input circuit figure, and B is its equivalent electrical circuit.
Meet the input grid-bias resistance R of field effect transistor among the figure behind 3---pyroelectric detectors 31---
g32---field effect transistor T
133---the equivalent leakage resistance R of pyroelectric detector
d34---the equivalent capacity C of pyroelectric detector
d35---field effect transistor T
1 Junction capacity C
g37---the source resistance R of field effect transistor
s
Fig. 4 A is pyroelectric detector of the present invention-field effect transistor input circuit, and B is its equivalent electrical circuit.(used label is identical with Fig. 3)
Among the figure 36---additional another field effect transistor T
235---connecing the equivalent input capacitance 38 of amplifier after under this connection---amplifier that connects behind this input circuit
Fig. 5 is a sync peaks detecting circuit schematic diagram.
51---diode temperature sensor 52---operational amplifier 53---diode 54---modulator synchronizing signal 55---field effect transistor among the figure
Fig. 6 is the electric signal waveform figure of each several part among Fig. 5.
Below in conjunction with accompanying drawing in detail the present invention is described in detail.
By shown in Figure 1, the operation principle of noncontact of the present invention, Buccal Cavity Infrared Light Electronic Thermometer is: The Infrared Lens 1 of aspheric surface shape converges the infra-red radiation of measured target 11; Through the high accuracy frequency stabilization Oscillator shape modulator 2 is incided on the sensitive area of electrothermic type detector 3 by after the chopping modulation, produces The signal of telecommunication, insert pyroelectric detector-FET input circuit 4. The signal of telecommunication of output enters letter Number treatment circuit 5 amplifies through frequency-selectings, utilizes sync peaks detection and compression bandwidth technology, has suppressed Noise and obtain the signal of telecommunication of the infrared intensity that characterizes measured target 11, this signal of telecommunication is through non-Linear compensation and calibration obtain the voltage signal linear with the temperature of measured target 11, this Voltage signal can be kept its magnitude of voltage by a peak holding circuit 6, becomes by conventional A/D again Change and liquid crystal display drive circuit, demonstrate the temperature of measured target in liquid crystal display 7 usefulness numeral Degree. 8 is that an angle of departure is 8 °～12 ° super brightness red light emitting diodes, and the front adds A light hurdle is arranged, send the light beam of a redness, in the present invention as aiming. It makes a diameter The hot spot of the redness of about 1CM is radiated on the target 11 of distant place about 15CM, thermometer of the present invention What survey is exactly the temperature of hot spot position. 9 is the boxes that battery is installed, and temperature is provided The power supply of meter. More than each parts be fixed and be placed in the internal cavities of a joystick type shell 1. Outward The shell front end has two holes, is respectively the incident of light hole and the measurement target infra-red radiation of aiming beam The hole. The all parts of shell protection temperature measurer, and the stray radiation that has nothing to do of shielding and measured target.
When measuring people's body temperature, press earlier switch 10, red aiming then appears in plugged 8 at every turn Light beam. Please the tested person open mouth, thermometer of the present invention will apart from oral area 10～20CM of tested person The hot spot of aiming beam scans the position (such as the mid portion of lingual surface) of regulation, with about one second time Inswept. Then temperature measurer of the present invention records the body temperature that intraoral temperature has represented the people, with 0.1 ℃ Precision shows at liquid crystal display 7, and this numerical value will keep until measure next time.
Provide one embodiment of the present of invention below.
Infrared Lens 1 among Fig. 1 is design like this: its effect is an energy of collecting target emanation, and it is converged on the infrared eye.Common through mode optical system is that the convex lens by a slice convex lens or two gummeds constitute, and is ball and mirror or mirror group.Infrared Lens of the present invention is an aspheric surface shape, is preferably parabolic, makes the focal length of rims of the lens part, is shorter than the focal length of core, and the maximum gauge of establishing lens is D.The focal length of marginal portion is f
0, then the focal length of lens different-diameter D part is f
That is: more near core, focal length is long more, and lens are paraboloidal, closely locates to defocus, and emittance is disperseed, and distant location focuses on, and makes the received radiation concentration of energy and the signal enhancing.This design has adapted to the relative short distance Testing requirement of clinical thermometer, has reduced measuring distance and has changed the deviation that causes, has improved measuring accuracy.
2 modulators that design for the present invention among Fig. 1, the structural principle of this vibrator type chopping modulation device and driving circuit synoptic diagram are Fig. 2.One one end is fixed on high resiliency steel disc on the substrate as vibrating reed 21, is stained with one piece of cylindrical permanent magnet 22 of manufacturing with Nd-Fe-Bo permanent magnet material.Place coil former with two overlapping windings 23,24.23 as drive coil, is connected on the collector of transistor 25, and 24 as tickler, is connected to the base stage of transistor 25.The moment of energized, the magnetic field that coil 23 produces, attract permanent magnet 22, driving steel disc 21 moves to coil inside, the motion of permanent magnet, produce induction electromotive force again on coil 24, transistorized base current is increased, positive feedback increases the collector current by coil 23, more promote to attract permanent magnet to stretch into coil inside, when the Spring balanced of this gravitation and steel disc, permanent magnet is static, and base winding 24 induction electromotive forces are 0, current cut-off, the magnetic field diminishes of drive coil, steel disc bounces back into initial position, and one surpasses equilibrium point, the motion of magnet steel makes base winding 24 produce induced electromotive force again, positive feedback makes transistor collector produce electric current again, and the excitation coil of wire is generated an electromagnetic field, and attracts permanent magnet to move in the coil of wire once more ....So form the vibration of steel disc, periodically interdict and open the incident infrared radiation of process lens 1 focusing, finished modulation the measured target infrared radiation.This project organization of the present invention is simple, and modulating frequency is irrelevant with coil and external circuit by the natural vibration frequency decision of steel disc fully, stability can reach 0.04%, and driving circuit transistor power consumption 1mA only, realized high precision to infrared radiation signal, the modulation of high stable, the vibration modulation frequency of the present invention's design is about 75Hz, avoided the interference of power frequency (50-60Hz) and harmonic wave (100-120Hz), and made the response time of thermometer of the present invention can reach 0.1 second.
3 is infrared eye among Fig. 1, the present invention has adopted lithium tantalate (LiTaO3) or lead zirconate titanate (PZT) thermoelectric type detector, because radiation is modulated to target infrared, just can select for use highly sensitively, the good and price of signal to noise ratio (S/N ratio) is far below this class thermoelectric type detector of thermoelectric pile.
4 pyroelectric detector-field effect transistor the input circuits that design for the present invention among Fig. 1 are described as follows:
Input circuit and equivalent electrical circuit such as Fig. 3 of existing pyroelectric detector.
Pyroelectric detector is a constant current source.Its load is R
gAnd capacitor C=C
d+ C
gParallel connection.For improving the voltage responsive rate, must use bigger input resistance R
gYet,, work as timeconstant
e=R
gC＞1 o'clock, the voltage responsive rate with modulating frequency increase and linearity reduce, signal to noise ratio (S/N ratio) reduces, and makes the detector can not be at high-frequency work.In order to reduce τ
e, remove and on the detector manufacturing process, improve, reduce C
dCan only reduce grid-bias resistance R outward,
g, must be cost by reducing voltage responsive rate and signal to noise ratio (S/N ratio) again for this reason.
The present invention notices: τ
e=R
gAmong the C, C is the capacitor C of detector
dWith the junction capacity Cg sum of field effect transistor,, can obtain the effect that improves responsiveness and broadening frequency of utilization equally as long as reduce capacitor C.For this reason, the present invention design pyroelectric detector---the field effect transistor input circuit as shown in Figure 4.The gain of field effect transistor source electrode output amplifier
G in the formula
mMutual conductance for field effect transistor.This connection is connected on detector between the grid, source electrode of field effect transistor, has formed the equivalent input capacitance that connects amplifier after positive feedback effect (because K＜1 can not cause vibration) makes
Obviously, reduced (1+g than traditional circuit
mR
s) doubly, if with R
sReplace with constant current source, this electric capacity could reduce by 1-3 numbers of poles! Actual measured results shows, uses sort circuit of the present invention, τ
eSeveral times have been reduced to hundred times.That is to say that this input circuit of the present invention has improved several times to hundred times with the voltage responsive rate of pyroelectric detector, and can use at high frequency, and obtain good signal to noise ratio (S/N ratio).
5 is frequency-selecting amplifier and with the sync peaks detecting circuit of burst pulse control among Fig. 1.Among Fig. 5, diode temperature sensor 51 is installed in modulator the most nearby, is used to obtain the electric signal of corresponding thermometric environment.In the electric signal stack of operational amplifier 52, with the compensate for ambient Temperature Influence with the representative measured target that fetches from input circuit 4.The 53rd, be operated in the diode under little electric current.Utilize the non-linear of this diode, this diode is added in the negative feedback end of operational amplifier 52, finish nonlinear compensation.Measured target is modified to linear relationship through the signal of this amplifier output and the intensity of infrared radiation.The 54th, modulator synchronizing signal, dutycycle are 1: 8 burst pulse.This pulse is input to the grid of field effect transistor 55, only opens field effect transistor during pulse action, has controlled the switching of field effect transistor, has finished the synchronization zero-cross to measured signal, positive and negative peak detection effect, has compressed noise bandwidth effectively.Should illustrate that especially when the temperature of measured target was lower than environment temperature, this circuit of the present invention's design will be from the modulation signal paraphase of measured target, negative pulse is searched in synchronizing pulse control---and make the measured signal that is lower than room temperature obtain correct negative value output.Among Fig. 6,61 signals that are exaggerated for A point measured target; 62 B point is the synchronous peak detection control wave of modulator; 63 are C point detection output, and intensity is proportional to the electric signal of measured target temperature; 64 for the D point passes through the d. c. voltage signal that filtering obtains, and this magnitude of voltage is proportional to the temperature of measured target.
The noise of electronic circuit is directly proportional with the square root of the bandwidth of circuit, and the present invention is owing to there is high-precision modulator, and frequency stabilization is so the bandwidth of frequency-selecting amplifier only is 3-5Hz.Simultaneously, peak detection employing dutycycle is 1: 8 peak pulse, again effective bandwidth has been compressed
Doubly, signal to noise ratio (S/N ratio) is further improved, having guaranteed has sufficiently high amplifier gain and signal to noise ratio (S/N ratio) to the more weak infrared radiation of measured target.Also it should be noted that: adopt this synchronous detection mode to work, can get positive and negative value respectively the positive and negative signal of pyroelectric detector output.Generally, when the temperature of measured target is higher than the temperature of pyroelectric detector working environment, pyroelectric detector output positive signal; And when the temperature of measured target was lower than the temperature of pyroelectric detector working environment, pyroelectric detector was output as negative signal.With respect to only with an infrared radiation mask switch, adopt pyroelectric detector, determine that by detecting a switch moment infrared radiation signal peak value of pulse temperature measurer of temperature is (as United States Patent (USP) 4,797,840) because when target temperature is lower than detector environment temperature, generation be negative signal, this makes treatment circuit very complicated, so that is difficult to measure than the low target temperature of thermometer environment temperature of living in.Obviously, design of the present invention both can have been surveyed the temperature of the target that is higher than the thermometer environment, also can survey the temperature of the target that is lower than thermometer environment temperature of living in, had application value widely.
5 also comprise conventional calibration circuit among Fig. 1.The voltage signal linear with the temperature of measured target 11 can be kept its magnitude of voltage by a peak holding circuit 6, shows by the A/D conversion of a routine and the digital voltmeter 7 of liquid crystal display again.Digital voltmeter directly demonstrates the temperature value of measured target.
8 for being added with the aiming red light emitting diodes on light hurdle among Fig. 1.People's intraoral temperature is considered to the most correctly reflect people's body temperature, in order to determine one with reference to scaling point, the present invention has designed and has used super brightness, emission angle is 8 °-12 ° a red light emitting diodes, by a circular hole light hurdle, in the 15-20cm scope of Infrared Lens the place ahead, form the red hot spot that diameter is the distinctness about 1cm, it is adjusted to Infrared Lens approximate coaxial, the position at hot spot place (as being aligned in rear portion on the interior lingual surface of human mouth) is the target that lens converge its infrared radiation like this, also is about to record temperature herein.
About all used components and parts of the influence of environment temperature and temperature measurer the temperature stability problem, the present invention solves like this: remove pyroelectric detector, operational amplifier, adopted in the designs such as non-linear compensation circuit outside the conventional temperature compensation measure, the debugging of complete machine is carried out in the constant temperature oven of 20 ℃ and 40 ℃ two kinds of environment temperatures repeatedly, furnishing unanimity, and calibration.Adopt the practice of the comprehensive constant temperature debugging of this complete machine.But the deviation that the response of the different temperatures of each element of balance may cause obtains best temperature compensation result, has guaranteed service precision.
The present invention realized a kind of have sufficiently high precision and stability, intact and contact with human body, measure oral temperature determining body temperature, and low cost just can be made contactless Buccal Cavity Infrared Light Electronic Thermometer.Certainly, design of the present invention can be applied to the Non-contact Infrared Temperature Measurement instrument of other purposes that comprises medical treatment.As long as without prejudice to design philosophy of the present invention, can make the infrared thermometer of various modification.
Claims (12)
1. noncontact, Buccal Cavity Infrared Light Electronic Thermometer, comprise shell, one power supply 9 is arranged in the enclosure, switch 10 is placed on the appropriate location, it is characterized in that also comprising the non-spherical lens 1 that converges the object infrared radiation of surveying, the infrared radiation that is converged incides on the detector 3 after modulator 2 chopping modulation, and the electric signal of detector 3 outputs obtains the temperature of the object of surveying through processing of circuit.
2. by the described noncontact of claim 1, Buccal Cavity Infrared Light Electronic Thermometer, it is characterized in that said non-spherical lens 1 is a parabolic lens.
3. by the described noncontact of claim 1, Buccal Cavity Infrared Light Electronic Thermometer, it is characterized in that said modulator 2 comprises steel disc 21, the magnetic material 22 that is fixed on the steel disc 21 places in the coil former of winding 23 and 24.
4. press claim 1 or 3 described noncontacts, Buccal Cavity Infrared Light Electronic Thermometer, it is characterized in that said magnetic material 22 is Nd-Fe-Bo permanent magnet materials.
5. press claim 1 or 3 described noncontacts, Buccal Cavity Infrared Light Electronic Thermometer, it is characterized in that said circuit is a transistor 25.
6. by the described noncontact of claim 1, Buccal Cavity Infrared Light Electronic Thermometer, it is characterized in that said detector 3 is lithium tantalate (LiTaO3) or lead zirconate titanate (PZT) thermoelectric type detector.
7. by the described noncontact of claim 1, Buccal Cavity Infrared Light Electronic Thermometer, it is characterized in that said treatment circuit comprises pyroelectric detector-field effect transistor input circuit 4, sync peaks detecting circuit 5, peak holding circuit 6 and digital voltmeter 7.
8. by claim 1 or 7 described noncontacts, Buccal Cavity Infrared Light Electronic Thermometer, it is characterized in that said field effect transistor input circuit is field effect transistor 32 and 36 serial connections, pyroelectric detector 3 is connected between the grid, source electrode of field effect transistor 32.
9. press claim 1 or 7 described noncontacts, Buccal Cavity Infrared Light Electronic Thermometer, it is characterized in that said sync peaks detecting circuit 5 comprises the grid with synchronizing pulse 54 control field effect transistor 55.
10. by the described noncontact of claim 1, Buccal Cavity Infrared Light Electronic Thermometer, it is characterized in that having the light emitting diode 8 of aiming usefulness in the front portion of clinical thermometer.
11. by the described noncontact of claim 10, Buccal Cavity Infrared Light Electronic Thermometer, the emission angle that it is characterized in that light emitting diode is 8 °----12 °.
12. by the described noncontact of claim 3, Buccal Cavity Infrared Light Electronic Thermometer, it is characterized in that coil 23 connects the collector of transistor 25, the base stage that coil 24 connects transistor 25 forms positive feedback.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98102733.4A CN1116013C (en) | 1998-06-25 | 1998-06-25 | Infrared and electronic non-contact oral thermometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98102733.4A CN1116013C (en) | 1998-06-25 | 1998-06-25 | Infrared and electronic non-contact oral thermometer |
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| Publication Number | Publication Date |
|---|---|
| CN1240932A true CN1240932A (en) | 2000-01-12 |
| CN1116013C CN1116013C (en) | 2003-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98102733.4A Expired - Fee Related CN1116013C (en) | 1998-06-25 | 1998-06-25 | Infrared and electronic non-contact oral thermometer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103261862A (en) * | 2010-08-11 | 2013-08-21 | 莫戈公司 | Temperature measurement correction using multiple temperature sensors |
| CN103674284A (en) * | 2012-09-05 | 2014-03-26 | 罗伯特·博世有限公司 | Temperature measuring apparatus, and method for temperature measurement |
| EP3634217A4 (en) * | 2017-05-09 | 2021-01-20 | Yes Biotechnology Inc. | Devices, systems and methods relating to thermometer housings for attachment to hand-held thermometers forin situ |
| CN113749623A (en) * | 2020-11-23 | 2021-12-07 | 田海中 | Method, system and device for non-contact, namely rapid and accurate measurement of oral cavity body temperature |
-
1998
- 1998-06-25 CN CN98102733.4A patent/CN1116013C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103261862A (en) * | 2010-08-11 | 2013-08-21 | 莫戈公司 | Temperature measurement correction using multiple temperature sensors |
| CN103261862B (en) * | 2010-08-11 | 2015-12-16 | 莫戈公司 | Use the temperature measurement correction of multiple temperature sensor |
| CN103674284A (en) * | 2012-09-05 | 2014-03-26 | 罗伯特·博世有限公司 | Temperature measuring apparatus, and method for temperature measurement |
| EP3634217A4 (en) * | 2017-05-09 | 2021-01-20 | Yes Biotechnology Inc. | Devices, systems and methods relating to thermometer housings for attachment to hand-held thermometers forin situ |
| CN113749623A (en) * | 2020-11-23 | 2021-12-07 | 田海中 | Method, system and device for non-contact, namely rapid and accurate measurement of oral cavity body temperature |
| CN113749623B (en) * | 2020-11-23 | 2023-11-03 | 田海中 | Method, system and device for precisely measuring oral cavity body temperature in non-contact type instant speed |
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| Publication number | Publication date |
|---|---|
| CN1116013C (en) | 2003-07-30 |
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Assignee: Beijing Photoelectric Technology Co., Ltd. Assignor: Wang Shuduo Contract fulfillment period: 2008.12.10 to 2013.12.10 contract change Contract record no.: 2008990001435 Denomination of invention: Infrared and electronic non-contact oral thermometer Granted publication date: 20030730 License type: Exclusive license Record date: 20081212 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.12.10 TO 2013.12.10; CHANGE OF CONTRACT Name of requester: BEIJING WUKE OPTO-ELECTRICAL TECHNOLOGY CO., LTD. Effective date: 20081212 |
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Granted publication date: 20030730 Termination date: 20110625 |