CN215984870U - Optical positioning and distance-fixing non-contact human body infrared thermometer - Google Patents

Abstract

The invention relates to a non-contact human body infrared thermometer with optical positioning and distance-keeping functions, which comprises an optical positioning and distance-keeping component, a circuit board, forehead temperature head soft colloid, a forehead temperature head body, an infrared sensor component, a sensor connecting wire, a touch button, a plastic measuring button, a liquid crystal display screen bracket, a liquid crystal display screen, a backlight plate, a conductive bar, a plastic memory button, a plastic on/off button and the like. The forehead temperature head soft colloid is connected with the forehead temperature head body into a whole in a secondary rubber coating mode, the infrared sensor assembly is installed in the forehead temperature head body, the tail end of the infrared sensor assembly is connected with the circuit board through a sensor connecting line, the plastic measuring key, the plastic memory key and the plastic on/off key are connected with the upper shell into a whole in a secondary rubber coating mode, and the panel is fixed on the upper shell through a double-sided adhesive tape. The technical scheme overcomes the defects of the prior art in the aspects of positioning and distance measurement, and provides the simple and effective optical positioning and distance measurement non-contact human body infrared thermometer.

Description

Optical positioning and distance-fixing non-contact human body infrared thermometer

Technical Field

The invention relates to a thermometer, in particular to an optical positioning and distance-fixing non-contact human body infrared thermometer, belonging to the technical field of medical instruments.

Background

The clinical general human body temperature refers to the core temperature of the human body, and the human body mainly keeps the body temperature of all parts of the whole body through central nerves and blood circulation and reflects the body temperature to the surface temperature of the body. The measurement of the body temperature of the human body means that the body temperature value of the human body is obtained by measuring the part close to the core temperature of the human body. The traditional temperature measurement part is a natural cavity or an acupoint of a human body, such as an oral cavity, an armpit and a rectum. The rectum belongs to one of internal organs of a human body, the temperature of the rectum can represent the true core temperature of the human body most and is very stable, but the rectum cannot become a main measurement mode due to inconvenient temperature measurement and long temperature measurement time, and particularly for an infant and a young child with lively nature, the continuity and the stability of the contact between the thermometer and a measured part are easily influenced by the long measurement time, so that the measurement is inaccurate or unstable. The infrared thermometer is an important way for measuring the body temperature of a human body gradually because of short temperature measuring time and convenient operation, and the non-contact infrared thermometer is widely applied because the non-contact infrared thermometer avoids direct contact with a measured person during measurement and prevents cross infection. Particularly during epidemic situations, such products become the most prominent way for measuring body temperature in homes, hospitals, communities, enterprises, public institutions and other public places.

For all non-contact infrared thermometers, the positioning and spacing of the measured part before measurement is a critical factor for ensuring the measurement accuracy, and inaccurate temperature measurement can be caused by too long measurement distance or incorrect measurement position. The invention relates to a method and a structure for positioning and spacing a non-contact infrared thermometer, which are suitable for various infrared thermometers for measuring the body temperature in a non-contact manner. Since the forehead (eyebrow) of a human body is supplied with blood from the superficial temporal artery originating from the common carotid artery, and not only is close to the heart, but also the blood vessels are distributed shallowly, the temperature at the forehead (eyebrow) position is closer to the core temperature of the human body, and therefore, the forehead (eyebrow) position is also an important part for body temperature measurement. The non-contact infrared forehead thermometer is an infrared thermometer which senses infrared radiation energy emitted from the forehead, the eyebrow and the heart of a human body through an infrared sensor to measure the temperature of the human body. The present invention is further illustrated by taking the non-contact infrared forehead thermometer as an example.

At present, the non-contact infrared clinical thermometers on the market have two distance modes: one method is to distance by an infrared distance measurement mode, the method increases the complexity of the product, increases a lot of cost, and can only distance and can not position; and the other is a direct irradiation manner by led lamps, which has poor distance-fixing effect and is very unstable, so that a new solution is urgently needed to solve the above technical problem.

Disclosure of Invention

The invention provides an optical positioning and distance-fixing non-contact human body infrared thermometer aiming at the problems in the prior art, and the scheme overcomes the defects in the positioning and distance-fixing aspects in the prior art.

In order to achieve the purpose, the technical scheme of the invention is that the optical positioning and distance-fixing non-contact human body infrared thermometer comprises an optical positioning and distance-fixing component, a circuit board, forehead temperature head soft colloid, a forehead temperature head body, an infrared sensor component, a sensor connecting wire, a touch key, a plastic measuring key, a liquid crystal display screen support, a liquid crystal display screen, a backlight board, a conductive bar, a plastic memory key, a plastic on/off key, a panel, an upper shell, a lower shell, a screw, a battery anode spring, a battery cover, a battery and a battery cathode spring. The forehead temperature head soft colloid is connected with the forehead temperature head body into a whole in a secondary rubber coating mode. The infrared sensor assembly is installed in the forehead temperature head body, and the tail end is connected with the circuit board through a sensor connecting wire. The plastic measuring key, the plastic memory key and the plastic on/off key are connected with the upper shell into a whole in a secondary rubber coating mode, the panel is fixed on the upper shell through a double faced adhesive tape, the liquid crystal display screen and the backlight plate are installed in the liquid crystal display screen support, and the liquid crystal display screen support is fixed on the circuit board through screws and a clamping hook structure on the support. The conducting bar is installed in the liquid crystal display support, realizes the electric conduction of liquid crystal display and circuit board. The touch press key is welded on the circuit board. The circuit board is locked on the lower shell through screws. The lower parts of the battery anode spring and the battery cathode spring are arranged in the battery groove of the lower shell, and the other ends of the battery anode spring and the battery cathode spring are respectively welded on the circuit board. The battery is arranged in the battery groove of the lower shell, and two ends of the battery are respectively contacted with the battery anode spring and the battery cathode spring. The upper shell and the lower shell are fixedly connected through a clamping hook structure and a screw. The optical positioning distance assembly comprises a condensing lens (with a scale), a reflecting shade, a light source fixing structure and a light source connecting line. The reflecting cover is a paraboloidal mirror with the inner surface being a paraboloid; the light source realizes structural positioning through the fixed structure, so that the light emitting center of the light source is just positioned on the focus of the paraboloid, and according to the light reflection principle, light emitted by the light source is reflected by the paraboloid mirror and then is converted into parallel light parallel to the main axis of the paraboloid to be emitted, so that the intensity of the light parallel to the main axis direction is enhanced. The front of the reflector is provided with a condensing lens which is coaxial with the reflector, the condensing lens is provided with a scale for positioning and spacing, the scale is arranged in a cross shape, and the cross center of the scale is used for measuring and determining the measuring position.

In addition, according to the principle of refraction of light and the law of lens imaging, parallel light parallel to the main axis reflected by the parabolic mirror is refracted when passing through the condenser lens and is converged at one point, namely the focal point of the condenser lens, and the distance between the focal point of the condenser lens and the center of the condenser lens is the focal length of the condenser lens. The scale forms images with different directions and sizes at different distances from the focal point of the condenser lens, which are perpendicular to the main axis: a positive image is formed between the focal point of the condensing lens and the condensing lens, and the closer the distance from the focal point of the condensing lens, the smaller the image; at the focal point, no image is formed, i.e. the shape of the scale is not visible; at a position larger than the focal length of the condenser lens, the scale image is an inverted image, and the image is larger as the distance from the focal point of the condenser lens is larger. The focal length calculation formula of the condenser lens is as follows:

1/f＝(n－1)[1/R1－1/R2+(n－1)d/nR1R2]

in the formula: f is the focal length of the lens,

n is the refractive index of the lens material,

r1 is the radius of the curved surface of the first face of the lens,

r2 is the radius of the curved surface of the second face of the lens,

d is the thickness of the center of the lens.

As can be seen from the above formula, the smaller the refractive index n of the lens material, the larger the focal length of the lens.

R1 has a positive value if the first surface of the lens is convex and R1 has a negative value if it is concave; if the second surface of the lens is concave, R2 is positive, and if it is convex, R2 is negative.

In an improvement of the present invention, in the above optical positioning and spacing assembly, the condensing lens is a biconvex lens, or a plano-convex lens, or a meniscus lens, which is selected and determined according to the size of the product structure space.

In the above optical positioning and spacing assembly, the scale is attached (printed, printed or pasted) to either the front or rear mirror surface of the condenser lens, or is disposed in front of or behind the condenser lens without contacting the condenser lens.

In an improvement of the present invention, in the above-mentioned optical positioning and spacing assembly, the scale used for positioning and spacing is in an orthogonal manner, or in an oblique manner, or in another manner that can generate a junction.

As an improvement of the invention, a self-contained scale for positioning and spacing on the condenser lens will image in front of the condenser lens.

A design method of a non-contact human body infrared thermometer with optical positioning and distance measurement comprises the following steps: when the non-contact infrared thermometer is designed, a design calibration distance exists between the infrared sensor and a measured part, so that the focal length of the condensing lens in the optical component is equal to the design calibration distance, and the light source is arranged at the focus position of the paraboloidal mirror. When the infrared thermometer is started to enter a temperature measuring state, the plastic measuring button is pressed for a long time, the light source is electrified to emit light, light rays are reflected by the parabolic mirror and then parallelly irradiate the condensing lens, the light rays are converged at the focal point of the condensing lens at the other side of the condensing lens through refraction of the condensing lens, meanwhile, the scale used for positioning and spacing is used for imaging in front of the condensing lens, the cross point of the scale image is kept aligned with the forehead and eyebrow position of a measured person, the thermometer is moved towards the forehead, and the scale image is seen to be changed from big to small until the scale image disappears. The thermometer is continuously moved towards the forehead, and the ruler image appears again. In the moving process, when the scale image disappears, the measured part of the forehead of the human body is just positioned at the focus of the condensing lens, namely the actual distance between the sensor of the infrared thermometer and the measured part of the forehead of the human body is just equal to the designed calibration distance. At the moment, the plastic measurement key is released, the thermometer starts to automatically measure the body temperature, and the measurement result is displayed on the liquid crystal display screen. In the above-mentioned optical positioning distance assembly, the focal length of the condensing lens is the correct measurement distance, and its size is determined by the refractive index n of the lens material, the radius R1 of the curved surface of the first lens surface, the radius R2 of the curved surface of the second lens surface, and the thickness of the center of the lens. During design, the design is selected and determined according to the requirements of the structural space, materials and the like of the product.

Compared with the prior art, the invention has the following advantages: 1) the technical scheme applies the principles of reflection and refraction of light, utilizes the law of reflection of the mirror surface to the light and the focusing characteristic and the imaging rule of the condensing lens to the light, and not only realizes the determination of the distance of the non-contact infrared thermometer relative to a measuring part, namely the distance determination, but also effectively realizes the determination of the measuring position, namely the positioning through precise calculation, thereby improving the measuring accuracy of the infrared thermometer; 2) the invention has simple structure, is visual and easy to operate; 3) compared with the distance-fixing mode of infrared distance measurement in the market, the cost of the invention is reduced by more than 10-15%, on the basis of ensuring the accuracy of the product, the cost is saved, and the competitive advantages of the product in quality and cost are enhanced.

Drawings

FIG. 1 is an external view of a non-contact infrared forehead thermometer;

FIG. 2 is a sectional view of the non-contact infrared forehead thermometer assembly;

FIG. 3 is a schematic view of a lenticular lens;

FIG. 4 is a schematic view of a plano-convex lens;

FIG. 5 is a schematic view of a meniscus lens;

FIG. 6 is a schematic view of the optical positioning and spacing assembly;

in the figure: 1. a condenser lens (with a scale), 2 a reflector, 3 a light source, 4 a light source fixing knot, 5 a light source connecting line, 6 a circuit board, 7 a forehead temperature head soft colloid, 8 a forehead temperature head body, 9 an infrared sensor component, 10 a sensor connecting line, 11, 18, 20 a touch button, 12 a plastic measuring button, 13 a liquid crystal display screen bracket, 14 a liquid crystal display screen, 15 a backlight plate, 16 a conductive bar, 17 a plastic memory button, 19 a plastic on/off button, 21 a panel, 22 an upper shell, 23 a lower shell, 24 a screw, 25 a battery anode spring, 26 a battery cover, 27 a battery, 28 a battery cathode spring, 29 a parabolic mirror, 30 a parabolic mirror main shaft, 31 a parabolic mirror focus, 32 a distance between the parabolic mirror focus and the condenser lens center, 33 a condenser lens focus, 34 a condenser lens focus, 35. a condenser lens first curved surface, 36 a condenser lens second curved surface, 37 a condenser lens center thickness, 38 a scale, 39 a scale erect image, and 40 a scale inverted image.

The specific implementation mode is as follows:

for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.

Example 1: referring to fig. 1-6, the non-contact human body infrared thermometer with optical positioning and distance measurement comprises an optical positioning and distance measurement component, a circuit board 6, forehead temperature head soft colloid 7, forehead temperature head body 8, infrared sensor component 9, sensor connecting wire 10, touch keys 11, 18 and 20, plastic measuring keys 12, a liquid crystal display screen bracket 13, a liquid crystal display screen 14, a backlight board 15, a conductive bar 16, a plastic memory key 17, a plastic on/off key 19, a panel 21, an upper shell 22, a lower shell 23, a screw 24, a battery anode spring 25, a battery cover 26, a battery 27 and a battery cathode spring 28. The forehead temperature head soft colloid 7 is connected with the forehead temperature head body 8 into a whole in a secondary rubber coating mode. The infrared sensor assembly 9 is installed in the forehead temperature head body, and the tail end is connected with the circuit board 6 through a sensor connecting wire 10. The plastic measuring key 12, the plastic memory key 17 and the plastic on/off key 19 are integrated with the upper case 22 by a secondary encapsulation, and the panel 21 is fixed on the upper case 22 by a double-sided adhesive tape. The LCD screen 14 and the backlight plate 15 are arranged in the LCD screen bracket 13, and the LCD screen bracket 13 is fixed on the circuit board 6 through screws and hook structures on the bracket. The conductive strips 16 are mounted in the lcd bracket 13 to electrically connect the lcd 14 to the circuit board 6. The touch keys 11, 18, 20 are soldered to the circuit board 6. The circuit board 6 is screwed to the lower case 23. The lower parts of the battery positive electrode spring 25 and the battery negative electrode spring 28 are fitted into the battery case of the lower case 23, and the other ends are welded to the circuit board 6, respectively. The battery is mounted in the battery case of the lower case 23 with both ends in contact with the battery positive electrode spring 25 and the battery negative electrode spring 28, respectively. The upper shell 22 and the lower shell 23 are fixedly connected through a hook structure and a screw 24. The optical positioning distance assembly comprises a condensing lens (with a scale) 1, a reflecting shade 2, a light source 3, a light source fixing structure 4 and a light source connecting line 5. The reflector 2 is a parabolic mirror 29 having a parabolic inner surface. The light source 3 realizes structural positioning through the fixing structure 4, so that the light emitting center of the light source 3 is just positioned on the focus 31 of the paraboloid, and according to the reflection principle of light, the light emitted by the light source 3 is reflected by the paraboloid mirror 29 and then becomes parallel light parallel to the main axis 30 of the paraboloid to be emitted, so that the intensity of the light parallel to the main axis direction is enhanced. The front of the reflector 2 is provided with a condenser lens 1 which is coaxial with the reflector 2, the condenser lens 1 is provided with a scale 38 for positioning and spacing, the scale is arranged in a cross shape, and the cross center of the scale is used for measuring and determining the measuring position.

In addition, according to the principle of refraction of light and the law of lens imaging, parallel light parallel to the main axis 30 reflected by the parabolic mirror is refracted when passing through the condenser lens 1 and converged at a point, namely a condenser lens focal point 34, and a distance 33 between the condenser lens focal point 34 and the center of the condenser lens is the focal length of the condenser lens. The scale forms images of different directions and sizes at different distances from the condenser lens focus 34, perpendicular to the principal axis 30: between the condenser lens focal point 34 and the condenser lens 1, a positive image (39 in fig. 6) is formed, and the closer to the condenser lens focal point (shown as 34 in the drawing), the smaller the image; at the focal point, no image is formed, i.e. the shape of the scale is not visible; at a position larger than the focal length 33 of the condenser lens, the scale forms an inverted image, and the image becomes larger as the distance from the focal point of the condenser lens is larger. The focal length calculation formula of the condenser lens is as follows:

1/f＝(n－1)[1/R1－1/R2+(n－1)d/nR1R2]

in the formula: f is the focal length;

n is the refractive index of the lens material;

r1 is the radius of the first surface of the lens;

r2 is the radius of the curved surface of the second surface of the lens;

d is the thickness of the center of the lens.

As can be seen from the above formula, the smaller the refractive index n of the lens material, the larger the focal length of the lens.

If the first surface of the lens is convex (see 35 in the drawing), then the value of R1 is positive, and if it is concave, then R1 is negative; if the second surface of the lens (36 in the drawing) is concave, R2 is positive, and if it is convex, R2 is negative.

In the above optical positioning distance assembly, the condensing lens 1 may be a biconvex lens (shown in fig. 3), a plano-convex lens (shown in fig. 4), or a meniscus lens (shown in fig. 5), and is selected and determined according to the size of the product structure space. In the above-mentioned optical positioning and spacing assembly, the scale (38 in the drawing) may be attached (printed, printed or pasted) to any one of the front and rear mirror surfaces (35 or 36 in the drawing) of the condenser lens 1, or may be located on any one side of the condenser lens without contacting with the condenser lens.

In the above-mentioned optical positioning and spacing assembly, the scale used for positioning and spacing may be in the form of orthogonal, or crossed, or any other form that can create a junction. The scale (e.g. 38 in figure 6) used for positioning and spacing during measurement will form an erect image 39 within the focal length 33 of the condenser lens 1 and an inverted image 40 outside the focal length 33.

Example 2: referring to fig. 1-6, a design method of an optical positioning and distance-keeping non-contact human body infrared thermometer comprises the following steps: when the non-contact infrared forehead thermometer is designed, a design calibration distance exists between the infrared sensor and a measured part, so that in the optical assembly, the focal length 33 of the condensing lens is equal to the design calibration distance, and the light source 3 is arranged at the focus position of the parabolic mirror 29. When the infrared thermometer is started to enter a temperature measuring state, the plastic measurement key 12 is pressed for a long time, the light source 3 is electrified to emit light, light rays are reflected by the parabolic mirror 29 and then parallelly irradiate the condensing lens 1, and are converged at the focus 34 of the condensing lens on the other side of the condensing lens through the refraction of the condensing lens 1, and meanwhile, a scale 38 for positioning and spacing during measurement forms an inverted image 40 on the other side of the condensing lens 1. The thermometer is moved towards the forehead, the crossing point of the scale inverted image 40 is kept aligned with the forehead-eyebrow position of the testee, and at the moment, the scale inverted image 40 is seen to be changed from big to small until the scale inverted image disappears. Continuing to move the thermometer toward the forehead, ruler imaging occurs again, but as a progressively larger erect image 39. In the moving process, when the scale imaging disappears, it is indicated that the measured part of the forehead of the human body is just at the focus of the condensing lens 1 (shown as 34 in the attached drawing), that is, the actual distance between the sensor of the infrared thermometer and the measured part of the forehead of the human body is just equal to the designed calibration distance. When the plastic measuring button 12 is released, the thermometer automatically starts measuring the body temperature, and the measurement result is displayed on the liquid level display screen 14. In the above-mentioned optical distance-measuring assembly, the focal length 33 of the condenser lens 1 is the correct distance to be measured, and its size is determined by the refractive index n of the lens, the radius R1 of the curved surface (35 in the figure) of the first mirror surface of the lens, the radius R2 of the curved surface (36 in the figure) of the first mirror surface of the lens, and the thickness (37 in the figure) of the center of the lens. During design, the design is selected and determined according to the requirements of the structural space, materials and the like of the product. The position of the scale may be set according to actual needs, by being placed on any one of the front and rear mirror surfaces (35 or 36 in the drawings) of the condenser lens, or by being positioned in front of or behind the lens without contacting the lens. In this embodiment, the scale is self-contained on the original product (1 in fig. 2).

The working principle and the working process are as follows: referring to fig. 1-6, the working principle of the infrared thermometer is as follows.

All temperature of natureThe object with the temperature higher than absolute zero (-273.15 ℃) radiates electromagnetic waves including infrared bands to the surrounding space ceaselessly due to the thermal motion of molecules, and the relation between the radiation energy density and the temperature of the object conforms to the radiation law. According to Stefan and Boltzmann's law of infrared radiation, and considering the factors of the ambient temperature around the object: e ═ σ E (T)⁴-T₀ ⁴)。

In the formula: e is the radiation emergent degree in W/m²；

Sigma is Stefin-Boltzmann constant, 5.67 x 10^-8W/(m².K)；

Epsilon is the radiance of the object;

t is the temperature of the object in K;

T₀is the ambient temperature around the object, in K.

Measuring the emitted E, the temperature value T can be obtained.

The human body mainly radiates infrared rays with the wavelength of 9-10 mu m, and the infrared thermometer accurately measures the surface temperature of the human body by measuring the self-radiated infrared energy of the human body.

The infrared thermometer senses infrared radiation energy through an infrared sensor, and the infrared sensor is provided with two elements, namely a thermopile and a thermistor with a negative temperature coefficient. The thermopile has two hot and cold junctions, and the infrared radiation energy that the hot junction of thermopile was sensed can produce the voltage difference on the hot and cold junction of thermopile, and the infrared radiation energy is stronger, and the voltage difference of hot and cold junction is bigger. The thermistor is tightly attached to the cold junction surface and used for measuring the temperature of the cold junction surface.

The temperature is higher, the infrared radiation energy is stronger, the voltage difference generated by the infrared radiation energy sensed by the thermopile is converted into the corresponding temperature, and then the resistance value of the thermistor with the negative temperature coefficient is converted into the temperature value, so that the temperature of the cold and hot junction of the thermopile is obtained. The temperature of the cold and hot junction of the thermopile plus the temperature converted from the voltage of the cold and hot junction of the thermopile is the temperature of the object sensed by the thermopile. The infrared thermometer senses the surface temperature of the human body, and the surface temperature is corrected through a data table obtained through human body clinical tests, and finally the body temperature value of the human body is obtained.

It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.

Claims (8)

1. A non-contact human body infrared thermometer with optical positioning and distance measurement is characterized by comprising an optical positioning and distance measurement component, a circuit board, a forehead temperature head soft colloid, a forehead temperature head body, an infrared sensor component, a sensor connecting wire, a touch press key, a plastic measurement key, a liquid crystal display screen bracket, a liquid crystal display screen, a backlight board, a conductive bar, a plastic memory key, a plastic on/off key, a panel, an upper shell, a lower shell, a screw, a battery anode spring, a battery cover, a battery and a battery cathode spring, wherein the forehead temperature head soft colloid is connected with the forehead temperature head body into a whole in a secondary rubber coating manner, the infrared sensor component is installed in the forehead temperature head body, the tail end of the forehead temperature head soft colloid is connected with the circuit board through the sensor connecting wire, the plastic measurement key, the plastic memory key and the plastic on/off key are connected with the upper shell into a whole in a secondary rubber coating manner, the panel passes through the double faced adhesive tape to be fixed on the epitheca, and liquid crystal display, the board of being shaded are installed in the liquid crystal display support, and the liquid crystal display support passes through the pothook structure on screw and the support to be fixed on the circuit board, the busbar is installed in the liquid crystal display support, realizes the electric conductance of liquid crystal display and circuit board, touches the button welding on the circuit board, and the circuit board passes through the screw lock on the inferior valve, and the battery anode spring is installed in the battery jar of inferior valve with battery negative pole spring lower part, and the other end welds respectively on the circuit board, and the battery is installed in the battery jar of inferior valve, and both ends contact with battery anode spring and battery negative pole spring respectively, and the epitheca passes through pothook structure and screw fixed connection with the inferior valve.

2. The optical locating and spacing non-contact human body infrared thermometer according to claim 1, characterized in that the optical locating and spacing assembly comprises a condenser lens, a scale, a reflector, a light source fixing structure and a light source connecting line, the condenser lens is installed in front of the reflector in the forehead temperature head body, the light source is installed at the curved opening of the reflector and fixed by the light source fixing structure, and the tail of the light source is connected with the circuit board by the light source connecting line.

3. The optically positioned and spaced non-contact human infrared thermometer of claim 2, wherein the reflector is a parabolic mirror with an inner surface being a paraboloid, the light source is structurally positioned by the fixing structure such that the center of light emitted from the light source is located at the focal point of the parabolic mirror, and according to the principle of light reflection, the light emitted from the light source is reflected by the paraboloid and then emitted as parallel light parallel to the main axis of the paraboloid, such that the intensity of the light parallel to the main axis is enhanced.

4. The optically positioned and spaced non-contact human infrared thermometer of claim 3, wherein a condenser lens is positioned in front of and coaxial with the reflector.

5. The optically positioned and spaced non-contact human infrared thermometer of claim 3 or 4, wherein the condenser lens is a biconvex lens or one of a plano-convex lens or a meniscus lens.

6. The optical locating and spacing non-contact human body infrared thermometer according to claim 5, wherein a scale for locating and spacing is provided in a direction perpendicular to the axis of the condenser lens, the scale is disposed in a cross shape, the cross center of the scale is used for determining a specific position to be measured during measurement, and the scale is attached to any one of the front and rear mirror surfaces of the condenser lens or is located on any one side of the condenser lens without contacting the condenser lens.

7. The optically positioned and spaced non-contact human infrared thermometer of claim 6, wherein the scale used for positioning and spacing in the optical positioning and spacing assembly is shaped in either an orthogonal or an interdigitated configuration.

8. The optically positioned and spaced non-contact human infrared thermometer of claim 7, wherein the scale for positioning the spacing will image in front of the condenser lens.

Images