Device and method for carrying out threshold value adjustable pH value detection and alarm on basis of acid-base indicator absorption spectrum

Abstract

The invention discloses a device and a method for carrying out threshold value adjustable pH value detection and alarm on the basis of an acid-base indicator absorption spectrum. The device comprises a container for a solution to be detected, a light source, a photodetector, a voltage threshold value input end, a comparison circuit and an alarm, wherein the container for the solution to be detected is used for containing liquid to be detected and an acid-base indicator; the light source is used for emitting light waves with pH value sensitive wavelengths; the photodetector is used for receiving the light waves which penetrate through the solution to be detected and transforming a light signal into an electric signal; the voltage threshold value input end is used for receiving threshold voltage which is input by a user and corresponds to a special pH value; the comparison circuit is used for comparing the signals of the photodetector and the voltage threshold value input end; the alarm receives the signal of the comparison circuit and alarms. The device disclosed by the invention is capable of accurately and randomly setting the pH value detection threshold value according to the requirements of the user on pH value detection and alarm, and therefore the threshold value adjustable pH value detection and alarm are realized.

Description

technical field [0001] The invention belongs to the field of detection equipment, in particular to pH detection equipment. Background technique [0002] pH measurement is closely related to fields such as modern industry, agriculture, medicine, bioengineering, environment and scientific research, so pH sensors are currently attracting attention. [0003] For pH measurement, the traditional technology adopts the calibration of the indicator in the solution, and judges by observing the color change of the indicator, or uses a pH meter to measure, etc. The method of indicator calibration can only determine the pH of the solution in a relatively coarse range. The pH meter can accurately measure the pH value of the solution, but the pH meter needs to be in direct contact with each solution sample for measurement, and many samples are required. After the first measurement, the probe of the pH meter needs to be cleaned before the next sample can be measured, which is cumbersome an...

AI Technical Summary

Problems solved by technology

The method of indicator calibration can only determine the pH of the solution in a relatively coarse range. The pH meter can accurately measure the pH value of the solution, but the pH meter needs to be in direct contact with each solution sample for measurement, and many samples are required. After the first measurement, the probe of the pH meter needs to be cleaned before the next sample can be measured, which is cumbersome and time-consuming

The above pH detection methods are all manual operations and manual reading, and it is difficult to quickly and automatically screen whether a large number of samples reach a specified pH value

[0004] In addition, the automatic detection method in the prior art cannot adjust the threshold value of pH. When the user needs to adjust the threshold value, it is necessary to replace the relevant parts or even replace the entire instrument

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