Large dynamic range radiation temperature measurement system based on optical fiber light splitting

Abstract

The utility model provides a large dynamic range radiation temperature measurement system based on optical fiber light splitting and a temperature measurement method, and mainly solves the technical problem that when a conventional radiation temperature measurement instrument selects a short wavelength for temperature measurement, the large dynamic range temperature measurement requirement cannot be satisfied. The radiation temperature measurement system comprises an optical module, an acquisition module and a calculation module which are connected in sequence, the optical module comprises a light collecting unit and a light splitting unit; the light collecting unit is used for receiving a light signal reflected by a target object; one end of the light splitting unit is a common end, the other end of the light splitting unit is a branch end, and the common end is coupled with the output end of the light collecting unit; the branch end is composed of n optical fiber bundles, n is larger than or equal to 2, and each optical fiber bundle comprises a plurality of optical fibers. The acquisition module comprises m photoelectric detectors, wherein m is greater than or equal to 2 and less than or equal to n; each photoelectric detector is connected with one of the n optical fiber bundles and used for collecting optical signals transmitted by the light collecting unit and the corresponding optical fiber bundle, converting the optical signals into electric signals and transmitting the electric signals to the calculation module.

Description

Technical Field

[0001] The utility model relates to radiation temperature measurement equipment, in particular to a radiation temperature measurement system with a large dynamic range based on optical fiber splitting. Background Art

[0002] Radiation temperature measurement is a non-contact temperature measurement method with the characteristics of high speed and high precision. Existing radiation thermometers are generally composed of optical systems, photoelectric detectors, signal amplifiers and signal processing circuits. The optical system collects the infrared radiation energy of the target within its field of view, and the infrared radiation energy is focused on the photoelectric detector and converted into a corresponding electrical signal. The signal is converted into the temperature value of the measured target through the amplifier and signal processing circuit, thereby realizing the measurement of the temperature of the measured target.

[0003] However, when the radiation thermometer is measuring temperature, the change of ambient temperature has a great impact on the radiation energy, that is, the dynamic range of infrared radiation energy changing with temperature is extremely drastic. The use of conventional radiation thermometers with shorter wavelengths simply cannot meet the needs of a large dynamic temperature measurement range of thousands to tens of thousands of times. For example, for signal light with a central wavelength of 900nm, the radiation intensity at 1000 degrees differs by nine orders of magnitude from the radiation intensity at 200 degrees, which brings a huge burden to the subsequent circuit design. At the same time, it will also introduce various device noises, resulting in many problems such as loss of accuracy and limitation of dynamic range. Utility Model Content

[0004] The purpose of the utility model is to provide a large dynamic range radiation temperature measurement system based on optical fiber splitting, which mainly solves the technical problem that the existing radiation thermometer cannot meet the large dynamic range temperature measurement requirements when using a shorter wavelength for temperature measurement.

[0005] In order to achieve the above purpose, the technical solution of the utility model is:

[0006] A large dynamic range radiation temperature measurement system based on fiber optic splitting, which is special in that:

[0007] It includes an optical module, a collection module and a calculation module connected in sequence;

[0008] The optical module comprises a light collecting unit and a light splitting unit; the light collecting unit is used to receive the optical signal radiated by the target object; one end of the light splitting unit is a common end, and the other end is a branch end, wherein the common end is coupled and connected with the output end of the light collecting unit; the branch end is composed of n optical fiber bundles, and n≥2, and each optical fiber bundle comprises a plurality of optical fibers;

[0009] The acquisition module includes m photoelectric detectors, where n≥m≥2; each photoelectric detector is connected to one of the n optical fiber bundles, and is used to collect the optical signal transmitted by the light collection unit and the corresponding optical fiber bundle, and convert it into an electrical signal and transmit it to the calculation module;

[0010] The calculation module is used to calculate the received electrical signal to obtain the temperature value of the target object.

[0011] Furthermore, the light collecting unit is a light guide tube or an optical lens.

[0012] Furthermore, it also includes m filters which are respectively arranged at the input ends of the m photodetectors and correspond one-to-one to each photodetector, and each filter has the same operating wavelength range.

[0013] Furthermore, it also includes m filters respectively arranged at the input ends of the m photodetectors and corresponding one-to-one to each photodetector. When m≥3, the working wavelength range of at least one filter is different from the working wavelength range of other filters, and at least two filters are in the same wavelength range.

[0014] Furthermore, the filter is a bandpass filter.

[0015] Furthermore, it also includes an indicator light source, which is connected to one of the n optical fiber bundles that is not connected to the photodetector. The indicator light emitted by the indicator light source reaches the surface of the target object after passing through the corresponding optical fiber bundle and the light collecting unit, which is used to assist aiming.

[0016] Furthermore, the material of the optical fiber in each optical fiber bundle is quartz, multi-component glass or plastic;

[0017] The types of the m photodetectors are all the same, or all different, or some are the same;

[0018] The light guide is made of sapphire or quartz.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] 1. The utility model is a large dynamic range radiation temperature measurement system based on optical fiber splitting. By allocating a corresponding number of optical fibers to each optical fiber bundle in the splitting unit according to design requirements, the same beam of signal light is divided into n branches with large energy differences and received by photoelectric detectors respectively. Finally, the temperature value of the target object is calculated by the calculation module. This splitting method greatly expands the energy dynamic range of the radiation temperature measurement system, thereby significantly improving the temperature range.

[0021] 2. The utility model is based on the large dynamic range radiation temperature measurement system of optical fiber splitting, and an indicating light source can be provided as required to facilitate auxiliary aiming of the target object and improve the measurement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural schematic diagram of an embodiment of the large dynamic range radiation temperature measurement system based on optical fiber splitting of the utility model in which the light collecting unit is a light guide.

[0023] Figure 2 This is a structural schematic diagram of an embodiment of the large dynamic range radiation temperature measurement system based on optical fiber splitting of the utility model in which the light collecting unit is an optical lens.

[0024] Figure 3 It is a schematic diagram of the structure of the optical module and the acquisition module in the first embodiment of the large dynamic range radiation temperature measurement system based on optical fiber splitting of the utility model.

[0025] Figure 4 It is a schematic diagram of the structure of the optical module and the acquisition module in the second embodiment of the large dynamic range radiation temperature measurement system based on optical fiber splitting of the utility model.

[0026] Figure 5 It is a schematic diagram of the structure of the optical module and the acquisition module in the third and fourth embodiments of the large dynamic range radiation temperature measurement system based on optical fiber splitting of the utility model.

[0027] Figure 6 This is a schematic diagram of the structure of the optical module and the acquisition module in Embodiment 5 of the large dynamic range radiation temperature measurement system based on optical fiber splitting of the present invention.

[0028] Figure 7 This is a schematic diagram of the structure of the optical module and the acquisition module in Example 6 of the large dynamic range radiation temperature measurement system based on optical fiber splitting of the utility model.

[0029] Figure 8 It is a schematic diagram of the structure of the optical module and the acquisition module in the seventh and eighth embodiments of the large dynamic range radiation temperature measurement system based on optical fiber splitting of the utility model.

[0030] The reference numerals are as follows:

[0031] 1-light collecting unit, 2-light splitting unit, 21-optical fiber bundle, 3-indicating light source, 4-photoelectric detector. DETAILED DESCRIPTION

[0032] For radiation thermometers using multiple wavelengths, the dynamic range of shorter wavelengths is often several orders of magnitude larger than that of longer wavelengths. Therefore, the utility model expands the measurement dynamic range by using a spectroscopic method, thereby meeting the actual technical needs of radiation thermometers with a wider range.

[0033] like Figure 1 and Figure 2 As shown, the utility model provides a large dynamic range radiation temperature measurement system based on optical fiber splitting, including an optical module, a collection module and a calculation module connected in sequence.

[0034] The optical module includes a light collecting unit 1 and a light splitting unit 2; the light collecting unit 1 is used to receive the optical signal (i.e., radiation energy) radiated by the target object itself. One end of the light splitting unit 2 is a common end, and the other end is a branch end, wherein the common end is coupled and connected to the output end of the light collecting unit 1; the branch end is composed of n optical fiber bundles 21, and n≥2, each optical fiber bundle 21 includes a number of optical fibers, and the specific number can be matched and designed according to the actual measurement requirements, so that the energy intensity of each optical fiber bundle can differ by five or more orders of magnitude, thereby expanding the dynamic range of the photodetector, improving the temperature range, and meeting the needs of large dynamic range temperature measurement.

[0035] The light splitting unit 2 can select a light guide ( Figure 1 shown) or optical lens ( Figure 2 shown).

[0036] The acquisition module includes m photodetectors 4, where n≥m≥2; each photodetector 4 is connected to one of the n optical fiber bundles 21, and is used to collect the optical signal transmitted by the light collection unit 1 and the corresponding optical fiber bundle 21, and convert it into an electrical signal and transmit it to the calculation module. The calculation module is used to calculate the received electrical signal to obtain the temperature value of the target object.

[0037] The radiation temperature measurement method of the utility model is:

[0038] 1) The light collecting unit 1 receives the light signal radiated by the target object.

[0039] 2) After being coupled at the common end of the light splitting unit 2 , the optical signal is outputted by the n optical fiber bundles 21 at the branch end and received by the corresponding m photodetectors 4 .

[0040] 3) The m photodetectors 4 convert the received optical signals into electrical signals and input them into the calculation module.

[0041] 4) The calculation module calculates the electrical signals output by each photodetector 4 and outputs the temperature value of the target surface, thereby realizing radiation temperature measurement with a large dynamic range.

[0042] The utility model can improve the dynamic range of the radiation temperature measurement system by reasonably adjusting the splitting ratio between the m-path detectors, thereby improving the temperature range of the radiation temperature measurement system. The energy range applicable to the existing single acquisition circuit is only a times. After the utility model splits the light into j paths of k1: k2: ...: kj through the splitting unit, the dynamic range of the input radiation energy is expanded to k1*k2*...*kj*a times, and the corresponding temperature range is correspondingly expanded, thereby realizing radiation temperature measurement with a large dynamic range.

[0043] The principle of optical fiber splitting of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0044] Embodiment 1

[0045] Reference Figure 3 The large dynamic range radiation temperature measurement system based on optical fiber splitting in this embodiment includes a light guide, a splitting unit 2, two photodetectors 4 and an indicating light source 3.

[0046] The light guide is a sapphire light guide with a diameter of 3 mm and a length of 60 mm. The two photodetectors 4 are two identical silicon detectors with a filter of 920±30 nm.

[0047] The light splitting unit 2 is composed of 19 plastic optical fibers with a diameter of 500 μm, and the common end thereof is coupled and connected to the output end with a diameter of 3 mm in the sapphire light guide tube. The 19 optical fibers at the branch end of the light splitting unit 2 are divided into three strands, one strand is connected to a silicon detector with a filter of 920±30 nm, one strand is connected to another silicon detector with a filter of 920±30 nm, and one strand is connected to the indicator light source 3. The indicator light emitted by the indicator light source 3 is emitted through the corresponding optical fiber, and then irradiated to the surface of the target object through the light guide tube for auxiliary aiming. The energy distribution is 1:17 through two silicon detectors, which can cover the energy dynamic range of the full range of 920 nm wavelength.

[0048] Embodiment 2

[0049] Reference Figure 4 The large dynamic range radiation temperature measurement system based on optical fiber splitting in this embodiment includes a light guide, a splitting unit 2 and three photodetectors 4.

[0050] The light guide is a sapphire light guide with a diameter of 3 mm and a length of 60 mm. Among the three photodetectors 4, two are identical silicon detectors with a filter of 920±30 nm, and the other is an InGaAs detector with a filter of 1550±30 nm.

[0051] The optical splitter unit 2 is composed of 37 quartz optical fibers with a diameter of 250μm, and its common end is coupled to the output end with a diameter of 3mm in the sapphire light guide. The 37 optical fibers at the branch end of the optical splitter unit 2 are divided into three strands, one strand with 1 fiber connected to a silicon detector with a 920±30nm filter, one strand with 5 fibers connected to an InGaAs detector with a 1550±30nm filter, and one strand with 31 fibers connected to a silicon detector with a 920±30nm filter. The energy is distributed in a ratio of 1:31 through the two silicon detectors, thereby expanding the energy dynamic range of the full range of the 920nm wavelength.

[0052] Embodiment 3

[0053] Reference Figure 5 The large dynamic range radiation temperature measurement system based on optical fiber splitting in this embodiment includes a light guide, a splitting unit 2 and four photodetectors 4.

[0054] The light guide is a sapphire light guide with a diameter of 3 mm and a length of 60 mm. Two of the four photodetectors 4 are identical silicon detectors with a filter of 920±30 nm, and the other two are identical indium gallium arsenide detectors with a filter of 1550±30 nm.

[0055] The optical splitting unit 2 is composed of 1000 multi-component glass multi-core optical fibers with a diameter of 9 μm, and its common end 21 is coupled and connected to the output end with a diameter of 3 mm in the sapphire light guide. The 1000 optical fibers at the branch end of the optical splitting unit 2 are divided into four strands, one strand of 10 fibers is connected to an InGaAs detector with a 1550±30nm filter, one strand of 490 fibers is connected to another InGaAs detector with a 1550±30nm filter, one strand of 10 fibers is connected to a silicon detector with a 920±30nm filter, and one strand of 490 fibers is connected to another silicon detector with a 920±30nm filter, and a 1:49 energy distribution is performed through the two groups of detectors, thereby expanding the energy dynamic range of the full range of 920nm wavelength and the full range of 1550nm wavelength respectively.

[0056] Embodiment 4

[0057] Reference Figure 5 The large dynamic range radiation temperature measurement system based on optical fiber splitting in this embodiment includes a light guide, a splitting unit 2 and four photodetectors 4.

[0058] The light pipe is a sapphire light pipe with a diameter of 3 mm and a length of 60 mm. Among the four photodetectors 4, one is an identical silicon detector with a filter of 920±30 nm, two are silicon detectors with a filter of 750±30 nm, and one is an InGaAs detector with a filter of 1550±30 nm.

[0059] The optical splitter unit 2 is composed of 37 quartz optical fibers with a diameter of 250μm, and the common end thereof is coupled and connected to the output end with a diameter of 3mm in the sapphire light guide. The 37 optical fibers at the branch end of the optical splitter unit 2 are divided into four strands, one of which is connected to a silicon detector with a filter of 750±30nm, one of which is connected to a silicon detector with a filter of 920±30nm, one of which is connected to an InGaAs detector with a filter of 1550±30nm, and one of which is connected to another silicon detector with a filter of 750±30nm. The energy distribution is 1:34 through two silicon detectors with a filter of 750±30nm, thereby expanding the energy dynamic range of the full range of 750nm wavelength.

[0060] Embodiment 5

[0061] Reference Figure 6 The large dynamic range radiation temperature measurement system based on optical fiber splitting in this embodiment includes a light guide, a splitting unit 2, three photodetectors 4 and an indicating light source 3.

[0062] The light guide is a sapphire light guide with a diameter of 3 mm and a length of 60 mm. The three photodetectors 4 are all identical silicon detectors without filters.

[0063] The light splitting unit 2 is composed of 37 quartz optical fibers with a diameter of 250 μm, and the common end thereof is coupled and connected to the output end with a diameter of 3 mm in the sapphire light guide. The 37 optical fibers at the branch end of the light splitting unit 2 are divided into four strands, one strand of 1 fiber is connected to the first silicon detector without a filter, one strand of 5 fibers is connected to the second silicon detector without a filter, one strand of 30 fibers is connected to the third detector without a filter, and one strand is connected to the indicator light source 3. The indicator light emitted by the indicator light source 3 is emitted through one fiber, and then irradiated to the object to be measured through the light guide for auxiliary aiming. The energy is distributed in a ratio of 1:5:30 through the three silicon detectors, thereby expanding the energy dynamic range of the full range.

[0064] Embodiment 6

[0065] Reference Figure 7 The large dynamic range radiation temperature measurement system based on optical fiber splitting in this embodiment includes an optical lens, a splitting unit 2, two photodetectors 4 and an indicating light source 3.

[0066] The optical lens is a lens with a focal length of 50 mm and an aperture of 24 mm. The two photodetectors 4 are both identical silicon detectors with a filter of 920±30 nm.

[0067] The light splitting unit 2 is composed of 19 quartz optical fibers with a diameter of 125μm, and the common end is set at the image point of the optical lens. The 19 optical fibers at the branch end of the light splitting unit 2 are divided into three strands, one of which is connected to a silicon detector with a 920±30nm filter, one of which is connected to another silicon detector with a 920±30nm filter, and one of which is connected to the indicator light source 3. The indicator light emitted by the indicator light source 3 is emitted through one optical fiber and then irradiated to the object to be measured through the optical guide for auxiliary aiming. The energy distribution of the two detectors at a ratio of 1:17 covers the full range of energy dynamic range.

[0068] Embodiment 7

[0069] Reference Figure 8 The large dynamic range radiation temperature measurement system based on optical fiber splitting in this embodiment includes an optical lens, a splitting unit 2 and four photodetectors 4.

[0070] The optical lens is a lens with a focal length of 70 mm and an aperture of 24 mm. Two of the four photodetectors 4 are identical silicon detectors with a filter of 920±30 nm, and the remaining two are identical indium gallium arsenide detectors with a filter of 1550±30 nm.

[0071] The optical splitter unit 2 is composed of 1000 multi-component glass multi-core optical fibers with a diameter of 9μm, and its common end is set at the image point of the optical lens. The 1000 optical fibers at the branch end of the optical splitter unit 2 are divided into four strands, one strand of 10 fibers is connected to a silicon detector with a 1550±30nm filter, one strand of 490 fibers is connected to another silicon detector with a 1550±30nm filter, one strand of 10 fibers is connected to an InGaAs detector with a 920±30nm filter, and one strand of 490 fibers is connected to another InGaAs detector with a 920±30nm filter. Through the 1:49 energy distribution of the two sets of detectors, the energy dynamic range of the full range of 920nm and 1550nm wavelengths is expanded respectively.

[0072] Embodiment 8

[0073] Reference Figure 8 The large dynamic range radiation temperature measurement system based on optical fiber splitting in this embodiment includes an optical lens, a splitting unit 2 and four photodetectors 4.

[0074] The optical lens is a lens with a focal length of 70 mm and an aperture of 20 mm. Among the four photodetectors 4, one is a silicon detector with a filter of 920±30 nm, two are the same silicon detectors with a filter of 750±30 nm, and the remaining one is an InGaAs detector with a filter of 1550±30 nm.

[0075] The optical splitter unit 2 is composed of 1000 multi-component glass multi-core optical fibers with a diameter of 9μm, and the common end is set at the image point of the optical lens. The 1000 optical fibers at the branch end of the optical splitter unit 2 are divided into four strands, one strand of 10 fibers is connected to the InGaAs detector with a 1550±30nm filter, one strand of 10 fibers is connected to the Si detector with a 920±30nm filter, one strand of 10 fibers is connected to the Si detector with a 750±30nm filter, and one strand of 970 fibers is connected to another Si detector with a 750±30nm filter. Through the 1:97 energy distribution of the two Si detectors with a 750±30nm filter, the energy dynamic range of the full range of the 750nm wavelength is expanded.

[0076] Based on the above embodiments, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the utility model.

Claims

1. A large dynamic range radiation temperature measurement system based on optical fiber splitting, characterized in that: It includes an optical module, a collection module and a calculation module connected in sequence; The optical module comprises a light collecting unit (1) and a light splitting unit (2); the light collecting unit (1) is used to receive an optical signal radiated by a target object; one end of the light splitting unit (2) is a common end, and the other end is a branch end, wherein the common end is coupled and connected to the output end of the light collecting unit (1); the branch end is composed of n optical fiber bundles (21), where n is greater than or equal to 2, and each optical fiber bundle (21) comprises a plurality of optical fibers; The acquisition module comprises m photoelectric detectors (4), wherein n≥m≥2; each photoelectric detector (4) is respectively connected to one of the n optical fiber bundles (21) and is used to collect optical signals transmitted by the light collection unit (1) and the corresponding optical fiber bundle (21), and convert the optical signals into electrical signals and transmit them to the calculation module; The calculation module is used to calculate the received electrical signal to obtain the temperature value of the target object.

2. The large dynamic range radiation temperature measurement system based on optical fiber splitting according to claim 1 is characterized in that: The light collecting unit (1) is a light guide tube or an optical lens.

3. The large dynamic range radiation temperature measurement system based on optical fiber splitting according to claim 2 is characterized in that: It also comprises m filters which are respectively arranged at the input ends of the m photoelectric detectors (4) and correspond one-to-one to each photoelectric detector (4), and each filter has the same operating wavelength range.

4. The large dynamic range radiation temperature measurement system based on optical fiber splitting according to claim 2 is characterized in that: It also includes m filters which are respectively arranged at the input ends of the m photodetectors (4) and correspond one-to-one to each photodetector (4); when m≥3, the working wavelength range of at least one filter is different from the working wavelength ranges of the other filters, and at least two filters are within the same wavelength range.

5. The large dynamic range radiation temperature measurement system based on optical fiber splitting according to claim 3 or 4, characterized in that: The filter is a bandpass filter.

6. The large dynamic range radiation temperature measurement system based on optical fiber splitting according to claim 5 is characterized in that: The device also comprises an indicating light source (3), which is connected to one of the n optical fiber bundles (21) that is not connected to the photoelectric detector (4), and the indicating light emitted by the indicating light source (3) reaches the surface of the target object after passing through the corresponding optical fiber bundle (21) and the light collecting unit (1), so as to assist aiming.

7. The large dynamic range radiation temperature measurement system based on optical fiber splitting according to claim 6 is characterized in that: The material of the optical fiber in each optical fiber bundle (21) is quartz, multi-component glass or plastic; The types of the m photoelectric detectors (4) are all the same, or all different, or some are the same and some are different; The light guide is made of sapphire or quartz.

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