Spectrophotometric detector for detecting methanal and ammonia in air
A spectrophotometric and detector technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of inconvenient operation, time-consuming and labor-intensive
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Embodiment 1
[0018] Embodiment 1: as figure 1 Shown, a kind of spectrophotometric detector that is used to detect formaldehyde and ammonia in the air, comprises the bottle cover 1 that is made up of base 1a and light-shielding cap 1b, is located at the cylindrical spectrophotometric detection bottle 2 inside bottle cover 1, and design On the side wall of the base 1a and located on both sides of the spectrophotometric detection bottle 2, the photosensitive sensor 4 and the light-emitting diode 3 for emitting detection light and converging the detection light on the photosensitive sensor 4, the light-emitting diode 3 and A light-shielding adhesive tape 5 is arranged on the photosensitive sensor 4 . The light-emitting diode 3 is composed of a 412nm light-emitting diode 3a and a 630nm light-emitting diode 3b. The included angle between the LEDs 3b is 15 degrees. At this time, the detection light emitted by the 412nm LED 3a and the 630nm LED 3b respectively passes through the spectrophotometri...
Embodiment 2
[0019] Embodiment 2: as figure 2 and image 3 As shown, the structure is the same as that of Example 1, the difference is: the 412nm light-emitting diode 3a and the 630nm light-emitting diode 3b are arranged left and right along the horizontal direction, and the 412nm light-emitting diode 3a and the 630nm light-emitting diode 3b The angle between them is 10 degrees. With this arrangement, the detection light emitted by the 412nm light-emitting diode 3a and the 630nm light-emitting diode 3b is easier to converge on the photosensitive sensor 4, and the processing difficulty is less.
[0020] When in use, first open the light-shielding cap 1b, add the absorbing liquid that has absorbed the harmful gas in the spectrophotometric detection bottle 2, add a color indicator to develop the color, open the light-emitting diode 3, if the formaldehyde is measured by the phenol reagent method, then Open 630nm light-emitting diode 3b; If measure formaldehyde with acetylacetone method, the...
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