CN112880842A

CN112880842A - Water surface temperature infrared thermometer without sky temperature measurement

Info

Publication number: CN112880842A
Application number: CN202011586578.1A
Authority: CN
Inventors: 张凯临; 管磊; 曲利芹
Original assignee: Ocean University of China
Current assignee: Ocean University of China
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-06-01

Abstract

The invention discloses a temperature measuring instrument scheme capable of measuring the surface temperature of outdoor water, in particular to an instrument scheme for measuring the temperature by using the blackbody radiation theory of an object, a temperature measuring sensor in the instrument does not need to have the capability of detecting the low-temperature and bright-temperature range of the sky, and the existing scheme is improved and innovated. The thermometer scheme comprises a radiation temperature sensor, a band-pass filter lens, a rotary scanning reflector and a master control electronic circuit, and is characterized in that the temperature sensor for measuring the surface temperature of the water body does not need to have the capacity of detecting the low-temperature sky brightness temperature range, and only needs to measure radiation temperature values at two or more different measurement angles relative to the surface of the water body instead, substitute reflection value theoretical curves of different angle values for fitting, and can accurately measure the temperature of the surface of the water body to be measured.

Description

Water surface temperature infrared thermometer without sky temperature measurement

Technical Field

The invention discloses a temperature measuring instrument scheme capable of measuring the surface temperature of outdoor water, in particular to an instrument scheme for measuring the temperature by using the blackbody radiation theory of an object, a temperature measuring sensor in the instrument does not need to have the capability of detecting the low-temperature bright temperature range of the sky, and the existing scheme is innovated and improved.

Background

The existing non-contact infrared radiation temperature measurement scheme applies the Planck equation law, namely the radiation peak value and the intensity of spontaneous black body radiation of an object are only related to the self absolute temperature, and if the measurement frequency is limited within a certain bandwidth, the radiation intensity is only related to the self temperature of the black body. The above describes the case where the emissivity of the object is 1, and if the emissivity of the object is less than 1, the radiation of the object includes the partially reflected received extraneous radiation. Taking the example of measuring the temperature of the surface of the water body when the surface of the water body is closer to the water surface, the previous scheme needs to measure the radiation temperature of the water surface, then measure the sky radiation temperature at the mirror angle with the radiation temperature, correct the part of the surface of the water body with emissivity not 1 according to the temperature of the sky radiation, and then accurately measure the temperature of the surface of the water body. The scheme needs to measure the radiation temperature of the sky, and because the radiation temperature of the sky can reach below-20 ℃ sometimes, a radiometer needs to have ultralow temperature measurement capability, so that the whole instrument is high in manufacturing cost and is not beneficial to popularization and use of the instrument. The invention avoids using ultra-low temperature measurement radiation measurement sensor by ingenious method, therefore, the cost is lower, and the precision is also guaranteed.

Disclosure of Invention

The invention discloses a thermometer scheme capable of measuring the surface temperature of outdoor water, which comprises a radiation temperature measuring sensor, a band-pass filter lens, a rotary scanning reflector and a master control electronic circuit and is characterized in that the temperature measuring sensor for the surface temperature of the water does not need to have the capability of detecting the low-temperature bright temperature range of the sky, but only needs to measure the radiation temperature values of two or more different measuring angles relative to the surface of the water and substitutes the radiation temperature values into reflection value theoretical curves of different angle values for fitting, so that the surface temperature of the water to be measured can be measured at high precision. The water body surface can be not limited to water, and can be suitable for all surfaces with approximate infrared radiation characteristics on the water body surface, including other types of liquid, solid or solid-liquid mixture. The above-mentioned detecting the sky low-temperature bright temperature range generally means detecting the temperature range below minus 20 degrees centigrade.

The invention has the advantages that the whole instrument design can avoid adopting a temperature measuring sensor in an ultralow temperature range, and the whole manufacturing cost can be reduced, thereby being beneficial to the popularization and the use of equipment.

Drawings

Fig. 1 is a general scheme design of the present invention.

The method comprises the following steps of 1, radiation temperature measurement sensor 2, rotating reflector 3, water surface 4, large-angle measurement position 5, small-angle measurement position 6, other measurement positions 7 and sky bright temperature radiation.

FIG. 2 is a graph of the emissivity of a water body surface as a function of angle.

8, measuring an angle axis 9, an emissivity axis 10 and a characteristic curve of the surface emissivity of the water body along with the change of the angle.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

The following description is made to explain how the present invention may be practiced in conjunction with the accompanying drawings.

Please refer to fig. 1, which is a general scheme diagram of the present invention.

In fig. 1, 1 is a radiation temperature measuring sensor, which includes parts of a conventional thermometer general scheme, such as a radiation temperature measuring sensor, a band-pass filter lens, a lens, and the like; 2, a rotating reflector, wherein the reflector is controlled by equipment to rotate at a certain angle to reflect radiation on the surface of the water body into the rotating reflector 1; 3 is the tested water body, or the solid, liquid, solid-liquid mixture and the like with similar properties to the water body; 4. and 5 and 6 are thermal radiation of different angles on the surface of the water body, and the radiation of different radiation angles is reflected into the sensor 1 by the rotating reflector 2. The value 7 is the sky bright temperature radiation, and the part close to 1.00 but less than 1.00 is the part contributed by the sky bright temperature radiation, corresponding to different emission values at different angles in the graph of fig. 2.

FIG. 2 is a graph of radiation values at different angles of the surface of a body of water versus emissivity of the surface of the body of water. The horizontal axis 8 is a measurement angle axis, the vertical axis 9 is an emissivity axis, and the curve 10 is a characteristic curve of emissivity of the water surface changing with angle. It can be seen from the figure that the emissivity of the radiation perpendicular to the water surface is highest, and is close to 1.00, and the emissivity tends to be gradually reduced along with the horizontal angle zone. The curve is obtained through calculation or actual measurement and is the inherent property of the water body, so that the curve can be used for high-precision measurement of the surface temperature of the water body.

Claims

1. The utility model provides a but measuring chamber surface temperature's thermoscope scheme of outdoor water surface temperature, includes radiation temperature sensor, band-pass filter lens, rotatory scanning speculum and total control electronic circuit, its characterized in that this water surface temperature's temperature sensor need not have the ability of surveying sky low temperature bright temperature scope, and the substitute only need measure for the water surface two or more different radiation temperature values of measuring the angle, substitutes the reflection value theoretical curve of different angle values and fits, can the high accuracy survey water surface's that awaits measuring temperature.

2. The surface of a body of water, not limited to water, as claimed in claim 1, is suitable for use on all surfaces having near infrared radiation characteristics, including other types of liquids and solids or mixtures.

3. A detected sky low temperature bright temperature range as claimed in claim 1, characterised by detecting a temperature range below-20 degrees celsius.