on an optical signal on detector channel med.appl.

[ochernen]

Определяют размер частиц методом лазерной дифракции. Помогите понять смысл этого предложения.

All measurements were started on an optical signal on detector channel 30 (for fine particles) of 0.2%.

То есть Все измерения начинались когда? ... когда оптический сигнал на 30-м канале детектора (для тонкодисперсных частиц) достигал уровня 0,2%?

Заранее благодарен.

[ochernen]

И еще ....
Ghost peaks from propellant(s) were removed with forced stability.

Что значит with forced stability? .. с принудительной устойчивостью? .. или здесь просто говорится что ложные пики от пропеллентов стабильно (т.е. постоянно) принудительно удалялись?

[ochernen]

Аппп ... очень нада :)

[glomurka]

>>Ghost peaks from propellant(s) were removed with forced stability.
а что за материал там исследовали? Может речь об исследовании стабильности (принудительное разложение, ускоренные условия и т. п.) - и Ghost peaks удаляли только для таких образцов?

[ochernen]

не-не-не ... там исследовали дозирующие ингаляторы под давлением с кортикостероидами для лечения астмы

Вот весь контекст (предпоследнее предложение):
Particle sizing in the aerosols

For measurement of the particle size distributions (PSDs) in the aerosols from the pMDIs we used a laser diffraction apparatus (Sympatec Helos BF Magic) with inhaler adapter (Inhaler 2000, Sympatec, Clausthal-Zellerfeld, Germany). The inhaler adapter has a flow controller and solenoid valve with timer to adjust to the desired inspiratory flow rate and suction time. The flow rate was measured with a venturi- meter. Unless indicated otherwise, suction of the aerosol through the laser beam was at a constant flow rate of 10 l/ min during 3 s. This was decided after it was checked with time sliced measurements that this time is sufficiently long enough to draw the entire aerosol from the pMDI through the laser beam. All measurements were started on an optical signal on detector channel 30 (for fine particles) of 0.2%. The relative humidity in the laboratory (at a room temperature of 20-22 °C) was varied between low (approx. 30%), median (approx. 55%) and high (approx. 75%) to investigate the effect of ambient conditions on the particle size distribution.
A 100 mm (R3) lens was used with a measuring range of 0.5-175 µm and calculations were made with the Fraunhofer theory after it was checked that no overestimation of fine particles occurred. Ghost peaks from propellant(s) were removed with forced stability. No sheath or counter flow through the adapter was added to the aerosol cloud and the distance from the exit of the mouthpiece to the laser beam was fixed to 50 mm after it was checked that this yields realistic size distributions.

[glomurka]

вот тут немножко по теме
http://karenandmike.biz/public/dugway 2011 data report and summary.docx
As the beam travels further with the large focal length lenses, they are more susceptible to vibrations causing the beam to ‘waffle’ or oscillate resulting in beam steering or ‘wings’ as light rays strike the adjacent two rings of the photodetector closest to the centroid. These ‘wings’ or phantom large particles interfere with diffraction rays of real large particles striking this area. Two software techniques are available to apparently identify and remove these phantom modes; 1) software algorithm and 2) ‘forced stability’. The later manual forced removal effectively reduces the desired dynamic range redistributing the volume contribution over the remaining dynamic range.

[PicaPica]

Все измерения запускались при достижении оптическим сигналом на 30-м канале детектора (для тонкодисперсных частиц) уровня 0,2%?

[ochernen]

Спасибо. PicaPica взял Ваш вариант.

glomurka, вот так можно написать?:
Ложные пики от пропеллентов удалялись вручную с применением специального метода с использованием ПО ("forced stability").

[glomurka]

либо так, либо уже глубоко копать по спецификациям Симпатика

[ochernen]

Спасибо :)