Sea water temperature and salt calibration data acquisition device

Abstract

The invention relates to a sea water temperature and salt calibration data acquisition device, which comprises a thermostatic bath, a standard temperature sensor and a standard conductivity sensor, wherein a simulated sea water environment is in the thermostatic bath, a support frame is arranged in the thermostatic bath, and two or more detected CTDs are fixed on the support frame; the standard temperature sensor and the standard conductivity sensor are connected through a watertight cable and can be lowered to the position, close to a detected CTD, in the thermostatic bath, and the standard temperature sensor, the standard conductivity sensor and the detected CTD are located at the same depth. Real-time measurement of temperature and conductivity in the thermostatic bath can be realized,standard temperature and standard conductivity values are provided for experimenters, and abnormal conductivity in the experiment process can be found out at the same time. The conductivity standard value can be obtained in real time, a sea water sample does not need to be collected in an experiment, the conductivity measurement error of the detected CTD can be found in time, and the experiment process is optimized.

Description

technical field [0001] The invention relates to a data acquisition device, in particular to a seawater temperature and salt calibration data acquisition device. Background technique [0002] When the marine metrology calibration laboratory performs the temperature and conductivity calibration of the temperature, salinity and depth measuring instrument (abbreviation: CTD), the standard platinum resistance thermometer and the high-precision temperature measuring bridge are generally used as the temperature standard. The test CTD is placed in a constant temperature bath simulating the seawater environment, the temperature and conductivity are measured at the set temperature calibration point, and the standard temperature value recorded by the platinum resistance thermometer and the temperature and conductivity measurement value of the test CTD are recorded. At the same time, seawater samples were collected at each temperature calibration point for future use. After completing ...

AI Technical Summary

Problems solved by technology

[0003] At present, the depth of the seawater constant temperature bath is generally 800mm to 1200mm, and the length of the standard platinum resistance thermometer is about 475mm, which cannot be inserted into the lower part of the constant temperature bath. However, the measurement position of the tested CTD is generally in the lower part of the constant temperature bath, which leads to the Different regions can easily cause measurement deviation; the standard platinum resistance thermometer, temperature measuring bridge, high-precision salinity meter and standard seawater (used to calibrate the salinity meter before seawater sample measurement) and other devices and materials used in CTD calibration experiments are relatively expensive. High and has high requirements for ambient temperature and humidity, which cannot be afforded by ordinary calibration laboratories; and when CTD is calibrated, since the conductivity value in the constant temperature bath cannot be detected in real time, if the conductivity in the constant temperature bath fluctuates, the experimenter cannot find out , can only be obtained by measuring the collected seawater samples with a high-precision salinity meter after the experiment is completed, which leads to the fact that the standard conductivity value cannot be obtained in real time during the calibration experiment. In addition, CTD calibration experiments generally carry out several CTDs at the same time. It is necessary to use different versions of supporting software according to the requirements of the instrument type to carry out the connection, debugging, data recording and data conversion of the tested CTD, and the workload is relatively large

Images