CN1116013C - Infrared and electronic non-contact oral thermometer - Google Patents
Infrared and electronic non-contact oral thermometer Download PDFInfo
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- CN1116013C CN1116013C CN98102733.4A CN98102733A CN1116013C CN 1116013 C CN1116013 C CN 1116013C CN 98102733 A CN98102733 A CN 98102733A CN 1116013 C CN1116013 C CN 1116013C
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- infrared light
- buccal cavity
- electronic thermometer
- temperature
- light electronic
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Abstract
The present invention relates to an infrared and electronic non-contact oral thermometer. A power supply 9 is arranged in a casing, and a switch 10 is arranged in a proper position. The present invention also comprises a non-spherical lens 1 gathering the infrared radiation of a measured object. The gathered infrared radiation enters to a detector 3 after chopped and modulated by a modulator 2, and the temperature of the measured object is obtained after an electrical signal output by the detector 3 is processed by a circuit. The present invention is completely not contacted with the human body when measuring and has rapid and accurate measurement. The present invention can measure the objective temperature higher than the temperature which a thermometric indicator is at and can measure the temperature lower than the temperature which a thermometric indicator is at. The present invention especially adapts to the modern sanitary requirement.
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 medical apparatus and instruments, 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 ear intracavity and diaphragm-operated temperature, recorded body temperature 1～3 second.Their common ground all is temperature probe will be inserted in people's the ear acupoint.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 ambient temperature, and energy measurement is not lower than the object of ambient 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 radiation thermometer sensitivity, signal to noise 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 ambient temperature of living in; The also temperature of the target that energy measurement is lower than temperature measurer ambient temperature of living in.
Main 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 infra-red radiation of surveying, the infra-red radiation that is converged incides on the detector 3 after manipulator 2 chopping modulation, the signal of telecommunication 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 ambient temperature of living in; Also the temperature of the target that energy measurement is lower than temperature measurer ambient 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---manipulator 3---detector 4---pyroelectric detector-field effect transistor input circuit 5---peak-detector circuit 6---peak holding circuit 7---liquid crystal display 8---light emitting diode 9---battery 10---switch 11---measured object among the figure
Fig. 2 is a vibrator type chopping modulation device structure chart.
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 circuit.
Meet the input grid-bias resistance R of field effect transistor among the figure behind 3---pyroelectric detectors 31---
g
32---field effect transistor T
133---the equivalent ohmic leakage R of pyroelectric detector
d34---
The equivalent capacity C of pyroelectric detector
d35---field effect transistor T
1Junction 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 electric
The road.(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 sensors 52---operational amplifier 53---two among the figure
Utmost point pipe 54---manipulator synchronizing signal 55---field effect transistor
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; , incided on the sensitive area of electrothermic type detector 3 by after the chopping modulation through high accuracy frequency stabilization oscillator shape manipulator 2, the signal of telecommunication of generation inserts pyroelectric detector-field effect transistor input circuit 4.The signal of telecommunication entering signal treatment circuit 5 of output amplifies through frequency-selecting, utilize sync peaks detection and compression bandwidth technology, suppress noise and obtained the signal of telecommunication of the infrared intensity that characterizes measured target 11, this signal of telecommunication is through nonlinear compensation and calibration, obtain the linear voltage signal of temperature with measured target 11, this voltage signal can be kept its magnitude of voltage by a peak holding circuit 6, by conventional A/D conversion and liquid crystal display drive circuit, on liquid crystal display 7, demonstrate the temperature of measured target again with numeral.8 is that an angle of departure is 8 °～12 ° a super brightness red light emitting diodes, and the front is added with a light hurdle, sends the light beam of a redness, in the present invention as aiming.It is radiated on the target 11 of distant place about 15CM the hot spot of the redness of an about 1CM of diameter, and what thermometer of the present invention was surveyed is exactly the temperature of hot spot position.9 is the boxes that battery is installed, and the power supply of thermometer is provided.More than each parts be fixed and be placed in the internal cavities of a joystick type shell 1.The shell front end has two holes, is respectively the perforation of going into of the light hole of aiming beam and measurement target infra-red radiation.Each parts of shell protection temperature measurer, and shielding and the irrelevant stray radiation of measured target.
When measuring people's body temperature, press switch 10 earlier, red aiming beam then appears in energized 8 at every turn.Please the tested person open mouth, thermometer of the present invention is apart from oral area 10～20CM of tested person, and the hot spot of aiming beam is scanned the position (as the mid portion of lingual surface) of regulation, and is inswept with about one second time.Temperature measurer then of the present invention records the body temperature that intraoral temperature has been represented the people, shows on liquid crystal display 7 with 0.1 ℃ precision, 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 Detectors.Common through mode optical system is that the convex lens by a slice convex lens or two gummeds constitutes, and is coquille 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 receiver 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 certainty of measurement.
2 manipulators that design for the present invention among Fig. 1, the structural principle of this vibrator type chopping modulation device and drive circuit sketch map 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 eclipsed windings 23,24.23 as excitation coil, is connected on the colelctor electrode of transistor 25, and 24 as feedback coil, 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 excitation 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 infra-red radiation of process lens 1 focusing, finished modulation the measured target infra-red radiation.This project organization of the present invention is simple, and modulating frequency is irrelevant with coil and external circuit by the eigentone decision of steel disc fully, stability can reach 0.04%, and drive circuit transistor power consumption 1mA only, realized high accuracy 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 Detectors 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 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 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 response rate, must use bigger input resistance R
gYet,, work as timeconstant
e=R
gC＞1 o'clock, the voltage response rate with modulating frequency increase and linearity reduce, signal to noise 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 response rate and signal to noise 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 out 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 response rate of pyroelectric detector, and can use at high frequency, and obtain good signal to noise ratio.5 is frequency-selective 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 manipulator the most nearby, is used to obtain the signal of telecommunication of corresponding thermometric environment.In the signal of telecommunication 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 infra-red radiation.The 54th, manipulator 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 impulse 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 ambient temperature, this circuit of the present invention's design will be from the modulation signal paraphase of measured target, negative pulse is searched in lock-out pulse control---and make subambient measured signal 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 manipulator; 63 are C point detection output, and intensity is proportional to the signal of telecommunication 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 manipulator, and frequency stabilization is so the bandwidth of frequency-selective 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 is further improved, having guaranteed has sufficiently high amplifier gain and signal to noise ratio to the more weak infra-red 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 infra-red 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 ambient 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 ambient 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, the angle of departure 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 infra-red radiation like this, also is about to record temperature herein.
About all used components and parts of the influence of ambient 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-compensating measure, the debugging of complete machine is carried out in the calorstat of 20 ℃ and 40 ℃ two kinds of ambient 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-compensating 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 radiation 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 infra-red radiation of surveying, the infra-red radiation that is converged incides on the electrothermic type detector (3) after vibrator type manipulator (2) chopping modulation, and the signal of telecommunication of detector (3) output is handled through the field effect transistor input circuit, obtains the temperature of the object of surveying.
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 manipulator (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 a Nd-Fe-Bo permanent magnet material.
5. press claim 1 or 3 described noncontacts, Buccal Cavity Infrared Light Electronic Thermometer, it is characterized in that said circuit is 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 that field effect transistor (32) and (36) are connected in series, 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 lock-out 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 angle of departure 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 colelctor electrode 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1240932A CN1240932A (en) | 2000-01-12 |
| CN1116013C true CN1116013C (en) | 2003-07-30 |
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Family Applications (1)
| 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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| Country | Link |
|---|---|
| CN (1) | CN1116013C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8473238B2 (en) * | 2010-08-11 | 2013-06-25 | Moog Inc. | Temperature measurement correction using multiple temperature sensors |
| DE102012215690A1 (en) * | 2012-09-05 | 2014-03-06 | Robert Bosch Gmbh | Temperature measuring device, as well as methods for temperature measurement |
| JP2020520693A (en) * | 2017-05-09 | 2020-07-16 | イエス バイオテクノロジー，インク． | Device, system and method for thermometer housing for attachment to a handheld thermometer for in situ differentiation between viral and non-viral pathogens |
| 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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1998
- 1998-06-25 CN CN98102733.4A patent/CN1116013C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1240932A (en) | 2000-01-12 |
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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 |