Formaldehyde detection device and method based on intermediate infrared tunable laser

Abstract

The invention discloses a formaldehyde detection device and method based on an intermediate infrared tunable laser. The formaldehyde detection device comprises a signal generating module, a laser driver, a laser source, a detector, a lock-in amplifying module, a signal processing module and a result displaying module, wherein the signal generating module, the laser driver and the laser source aresequentially and electrically connected, the detector is connected with the lock-in amplifying module, one end of the signal processing module is connected with the lock-in amplifying module, and theother end of the signal processing module is connected with the display module. The formaldehyde detection device and method based on the intermediate infrared tunable laser are high in detection sensitivity, a measurement range can cover the space of a whole house, remote operation can be achieved, measurement results are received through a network, the whole measurement process can be greatly simplified, and the life safety of workers in a field is guaranteed.

Description

technical field [0001] The invention relates to the technical field of formaldehyde detection equipment, in particular to a formaldehyde detection device and detection method based on a mid-infrared tunable laser. Background technique [0002] With the continuous development of urbanization, there are thousands of newly renovated houses in China every year. However, many houses will inevitably release formaldehyde gas that is harmful to the human body after being newly renovated. Therefore, for the formaldehyde in the house Measurement is very important. Currently, formaldehyde is usually measured by electrochemical, differential ultraviolet and infrared absorption spectroscopy. [0003] However, the detection range of the electrochemical method is limited, and because the electrical sensor generally uses the principle of redox reaction to generate current, many gases are oxidized in the measurement environment, resulting in inaccurate measurement results; It takes a long ...

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Problems solved by technology

[0003] However, the detection range of the electrochemical method is limited, and because the electrical sensor generally uses the principle of redox reaction to generate current, many gases are oxidized in the measurement environment, resulting in inaccurate measurement results; It takes a long time to respond in real time; the electrochemical sensor is easily oxidized, so the service life is short and needs to be replaced frequently

The ultraviolet differential method has weak formaldehyde absorption in this band range, resulting in low measurement sensitivity, and is not suitable for indoor formaldehyde measurement that requires high precision.

In the method of infrared absorption spectroscopy, the light source has a wide band, and there are many gas absorption lines in this band, which are easily disturbed and affect the accuracy of formaldehyde measurement.

Moreover, most of the above three measurement methods use fixed-point or gas sampling for measurement, which makes the measurement space limited or requires multiple gas analysis devices, which increases the difficulty of measurement

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