Fast-response multi-wavelength infrared temperature measuring device

Abstract

The utility model discloses a fast-response multi-wavelength infrared temperature measuring device, which relates to the technical field of infrared temperature measuring devices and comprises an infrared probe, an infrared optical fiber, a first lens and a light splitting detection system. The infrared probe is used for collecting target radiation light and transmitting the target radiation light to the first lens through an infrared optical fiber; collimated light output by the first lens is processed by the light splitting detection system, the light splitting detection system comprises an infrared light splitting sheet, an infrared band-pass optical filter, a second lens and a fast response infrared detector, and the collimated light output by the first lens is split into quasi-infrared monochromatic light with wide spectrum by the infrared light splitting sheet; and each beam of quasi monochromatic light is filtered into infrared monochromatic light through an infrared band-pass filter, and the infrared monochromatic light is coupled into the fast-response infrared detector through a second lens. The fast-response multi-wavelength infrared temperature measuring device solves the problem of measurement of transient temperature below 1500K. The liquid nitrogen refrigeration type device can cover the temperature measurement range of 400 K-1500 K, and the electronic refrigeration type device can cover the temperature measurement range of 800 K-1500 K.

Description

Technical Field

[0001] The utility model relates to the technical field of infrared temperature measuring devices, in particular to a fast-response multi-wavelength infrared temperature measuring device. Background Art

[0002] The transient multi-wavelength radiation temperature measurement system is an optical system based on Planck's thermal radiation theory. It compares the radiance of the light source to be measured with the radiance of the standard light source at multiple wavelengths to obtain the temperature of the light source to be measured.

[0003] The multi-wavelength radiation temperature measurement system is the main means of material temperature diagnosis under dynamic loading due to its advantages such as fast response, high sensitivity, wide measurement range and good accuracy.

[0004] Currently, the commonly used multi-wavelength transient radiation temperature measurement system can cover the temperature measurement range of 1500K~2500K and 2500K-10000K. There is no public report on the fast-response infrared temperature measurement device for measuring transient temperatures below 1500K. Therefore, we propose a fast-response multi-wavelength infrared temperature measurement device. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the existing defects and provide a fast-response multi-wavelength infrared temperature measuring device, which solves the problem of measuring transient temperatures below 1500K. The liquid nitrogen refrigeration type device can cover the temperature measurement range of 400K to 1500K, and the electronic refrigeration type can cover the temperature measurement range of 800K to 1500K, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the utility model provides the following technical solutions: a fast-response multi-wavelength infrared temperature measuring device, comprising an infrared probe, an infrared optical fiber, a first lens and a spectroscopic detection system;

[0007] Infrared probe: used to collect target radiation light and transmit it to the first lens through infrared optical fiber; the collimated light output by the first lens is processed by the spectroscopic detection system.

[0008] Preferably, the spectroscopic detection system has no less than four groups.

[0009] Preferably, the spectroscopic detection system includes an infrared spectrometer, an infrared bandpass filter, a second lens and a fast-response infrared detector. The collimated light output by the first lens is divided into quasi-infrared monochromatic light with a wide spectrum by the infrared spectrometer. Each beam of quasi-monochromatic light is filtered into infrared monochromatic light by an infrared bandpass filter. The infrared monochromatic light is coupled into the fast-response infrared detector by the second lens.

[0010] Compared with the prior art, the beneficial effects of the utility model are: the fast response multi-wavelength infrared temperature measuring device has the following advantages:

[0011] Solve the problem of measuring transient temperature below 1500K. Liquid nitrogen refrigeration type device can cover the temperature measurement range of 400K ~ 1500K, and electronic refrigeration type can cover the temperature measurement range of 800K ~ 1500K. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The optical path diagram of the working principle of the utility model is shown in FIG.

[0013] In the figure: 1 infrared probe, 2 infrared optical fiber, 3 first lens, 4 spectroscopic detection system, 41 infrared spectrometer, 42 infrared bandpass filter, 43 second lens, 44 fast response infrared detector. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] See also Figure 1 ,This embodiment provides a technical solution: a fast-response multi-wavelength infrared temperature measurement device, comprising an infrared probe 1, an infrared optical fiber 2, a first lens 3 and a spectroscopic detection system 4;

[0016] Infrared probe 1: used to collect target radiation light and transmit it to the first lens 3 through the infrared optical fiber 2; the collimated light output by the first lens 3 is processed by the spectroscopic detection system 4, the first lens 3 is a lens L, and the spectroscopic detection system 4 has no less than four groups, and the spectroscopic detection system 4 includes an infrared spectrometer 41, an infrared bandpass filter 42, a second lens 43 and a fast-response infrared detector 44. The collimated light output by the first lens 3 is divided into quasi-infrared monochromatic light with a wide spectrum through the infrared spectrometer 41, and each quasi-monochromatic light is filtered into infrared monochromatic light through the infrared bandpass filter 42, and the infrared monochromatic light is coupled into the fast-response infrared detector 44 through the second lens 43;

[0017] The fast response four-wavelength infrared temperature measuring device uses an infrared probe 1 to collect the target light radiation signal and transmits the signal light to the spectroscopic detection system 4 through the infrared optical fiber 2.

[0018] The fast response four-wavelength infrared temperature measuring device adopts an infrared lens L combined with a plurality of long-wave pass and short-wave reflective beam splitters BS1-BS4 in a cascade mode to split light, so that a higher splitting efficiency can be achieved.

[0019] The fast response four-wavelength infrared temperature measurement device uses infrared bandpass filters BF1-BF4 to ultimately limit the spectral range entering the fast response infrared detectors D1-D4.

[0020] The fast-response four-wavelength infrared temperature measuring device uses a lens L to focus the optical signal emitted by the filter onto the photosensitive surface of the fast-response infrared detectors D1-D4.

[0021] The fast-response four-wavelength infrared temperature measuring device uses fast-response infrared detectors D1-D4 to linearly convert the optical signal of each channel into an electrical signal and output it to the signal recording system.

[0022] The fast response four-wavelength infrared temperature measuring device must be calibrated before use. During calibration, a black body furnace is used as the light source and a standard photoelectric pyrometer is used as the standard. Multi-point calibration is used to obtain the linear constants k1 to k4 of each working channel.

[0023] The fast response four-wavelength infrared temperature measuring device calculates the target temperature T and emissivity ε(T) through formula 1.

[0024]

[0025] In the formula, λ i is the operating wavelength of the i-th channel;

[0026] li(λ i , T) is the spectral radiance measured in the i-th channel, and its calculation formula is l i (λ i ,T)=V i / k i , where V i is the measured electrical signal amplitude of the i-th channel, k i is the linear constant of the ith channel;

[0027] L(λ i , T) The absolute blackbody radiation brightness with temperature T can be given by Planck's formula: C1 and C2 in the equation are the first and second radiation constants, respectively. C1 = 3.7418 × 10 -16 W*m 2 ,C2=1.4388×10 -2 m*K.

[0028] In the fast response four-wavelength infrared temperature measuring device, the infrared probe P used is made of calcium fluoride material, has a working distance of 1m, a focal diameter of about 1mm, and a probe outer diameter of 5mm to 25mm.

[0029] The infrared optical fiber is sulfide optical fiber with a core diameter of 1 mm and a length of 10 m. The lens L is a calcium fluoride plano-convex lens with a focal length of 80 mm and a diameter of 25 mm.

[0030] The narrowband filters BF1-BF4 have a diameter of 25mm, a peak wavelength transmittance greater than 90%, a background transmittance less than 0.01%, center wavelengths of 2.0μm, 3.0μm, 4.0μm and 5.0μm, and half-widths of 0.1μm, 0.1μm, 0.15μm and 0.2μm, respectively.

[0031] The diameter of the beam splitters BS1-BS4 is 25mm, the transmission band of BS1 is 2.5μm~6μm, and the reflection band is 1.5μm~2.3μm; the transmission band of BS2 is 3.5μm~6μm, and the reflection band is 2.5μm~3.3μm; the transmission band of BS3 is 4.5μm~6μm, and the reflection band is 3.5μm~4.4μm; the transmission band of BS4 is 5.5μm~6μm, and the reflection band is 4.5μm~5.4μm. The average transmittance of the transmission band is greater than 90%, and the average reflectance of the reflection band is greater than 90%.

[0032] The fast response infrared detector is a cooling type InSb detector with an effective photosensitive surface diameter of not less than 0.5mm, with a preamplifier, a bandwidth of not less than 12MHz, and a cooling method of liquid nitrogen or electronic cooling.

[0033] The working principle of a fast-response multi-wavelength infrared temperature measuring device provided by the utility model is as follows: the target radiation light collected by the infrared probe 1 is transmitted to the first lens 3 through the infrared optical fiber 2, and the collimated light output by the first lens 3 is divided into 4 beams of quasi-infrared monochromatic light with a wider spectrum through a spectroscopic detection system composed of 4 infrared spectrometers 41. Each beam of quasi-monochromatic light is filtered by an infrared bandpass filter 42 to be infrared monochromatic light with a bandwidth that meets the requirements, and then passes through a second lens 43 to couple the monochromatic light into a fast-response infrared detector 44.

[0034] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A fast response multi-wavelength infrared temperature measuring device, characterized in that: It comprises an infrared probe (1), an infrared optical fiber (2), a first lens (3) and a spectroscopic detection system (4); Infrared probe (1): used for collecting target radiation light and transmitting it to the first lens (3) through the infrared optical fiber (2); the collimated light output by the first lens (3) is processed by the spectroscopic detection system (4).

2. A fast response multi-wavelength infrared temperature measuring device according to claim 1, characterized in that: The spectroscopic detection system (4) has no less than four groups.

3. The fast response multi-wavelength infrared temperature measuring device according to claim 1, characterized in that: The spectroscopic detection system (4) comprises an infrared spectrometer (41), an infrared bandpass filter (42), a second lens (43) and a fast-response infrared detector (44). The collimated light output by the first lens (3) is divided into quasi-infrared monochromatic light with a wide spectrum through the infrared spectrometer (41). Each beam of quasi-monochromatic light is filtered into infrared monochromatic light through the infrared bandpass filter (42). The infrared monochromatic light is coupled into the fast-response infrared detector (44) through the second lens (43).

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