Take the common infrared gas detector as an example to illustrate the principle of the gas detector:
Measuring this absorption spectrum can identify the type of gas; measuring the absorption intensity can determine the concentration of the gas being measured. The infrared detector has a wide range of applications. It can analyze not only gas components but also solution components. It has high sensitivity, rapid response, continuous online indication, and can also form an adjustment system. The detection part of the infrared gas detector commonly used in the industry is composed of two parallel optical systems with the same structure.
One is the measurement room and the other is the reference room. The two chambers open and close the optical path simultaneously or alternately with a certain period through the light cutting plate. After the gas to be measured is introduced into the measurement chamber, light with a wavelength specific to the gas to be measured is absorbed, thereby reducing the luminous flux that enters the infrared receiving gas chamber through the optical path of the measurement chamber. The higher the gas concentration, the less the luminous flux entering the infrared receiving gas chamber; the luminous flux passing through the reference chamber is constant, and the luminous flux entering the infrared receiving gas chamber is also constant. Therefore, the higher the measured gas concentration, the greater the difference in luminous flux through the measurement chamber and the reference chamber. This difference in luminous flux is projected onto the infrared receiving gas chamber with an amplitude of a certain period of vibration. The receiving gas chamber is divided into two halves by a metal film with a thickness of several micrometers. The chamber is filled with the gas of the measured component with a relatively high concentration, which can absorb all the incident infrared rays within the absorption wavelength range, so that the pulsating light flux becomes The periodic change of temperature can then be converted into a change in pressure according to the gas state equation, and then detected with a capacitive sensor, which indicates the concentration of the measured gas after being amplified. In addition to capacitive sensors, quantum infrared sensors that directly detect infrared light can also be used. Infrared interference filters are used for wavelength selection and tunable lasers are used as light sources to form a brand-new all-solid infrared gas detector. This detector can use only one light source, a measurement room, and an infrared sensor to complete the measurement of gas concentration. In addition, if multiple optical filters with different wavelengths are used, the concentrations of various gases in the multi-component gas can be measured simultaneously.
The Malachite mineral is attractive to look at... with its swirling patterns and varying colors of green. This is the most common form you will find it in, but it may also be found as needle-like crystals and prismatic crystals.
It is often found inter-growing with other minerals... in particular the Azurite Malachite mixture is quite common, but it may also be found with a number of other copper based minerals, including Eilat Stone, Turquoise and Chrysocolla.
Its name dates back to ancient times and it is said that it originated from the Greek word for mallow 'malache', because of its color. It was used to make jewelry and ornaments as far back as 3000 BC, when it was in use in ancient Egypt.
Many of the ancient people also used it to make talismans as they believed it to be highly protective... which it is! Its vibration attracts people even though they are often not sure why... and it is one of the most popular stones sold for metaphysical purposes.
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