He aha ngā momo mita rere ultrasonic e rua?

E rua ngā momo matua o ngā mita rere ultrasonic, i runga i ō rātou mātāpono mahi:

1. Ngā Mita Rere Ultrasonic Wā-Waka
• Te Āhua o tā rātou Mahi:
• Inehia te rerekētanga o te wā haere o ngā tohu ultrasonic i waenga i ngā transducers e rua:
• I raro (me te rere): Ka tere ake te haere o te tohu.
• Ki runga (ki te taha o te awa): Ka roa ake te wā e tukuna ai te tohu.
• He rite te rerekētanga o ngā wā whakawhiti (\Delta t) ki te tere rere o te wai.
• Ngā Āhuatanga Matua:
• He pai rawa atu mō ngā wai ma, tata ma rānei (hei tauira, te wai, te hinu, ngā wai iti te matotoru rānei).
• Tino tika (±0.5% ki te ±2.0% i raro i ngā āhuatanga tino pai).
• Kāore e pokanoa, ā, e whakamahia whānuitia ana i roto i ngā momo ahumahi.
• Ngā Painga:
• He pai te mahi tahi me ngā wai ōrite.
• He pai mō ngā momo rahi me ngā rauemi paipa katoa.
• Kei te wātea ngā tāutanga kawe, ngā tāutanga tūturu rānei.
• Ngā Here:
• Ka heke te tika ina he nui ngā matūriki, ngā mirumiru, ngā poke rānei kei roto i ngā wai.

2. Ngā Mita Rere Ultrasonic Doppler
• Te Āhua o tā rātou Mahi:
• Inehia te nekehanga auau (te pānga Doppler) o ngā tohu ultrasonic e whakaata ana i ngā matūriki, i ngā mirumiru rānei i roto i te wai.
• Ka whakamahia te rerekētanga i waenga i ngā tohu kua tukuna me ngā tohu kua whakaatahia hei tatau i te tere rere.
• Ngā Āhuatanga Matua:
• I hangaia mō ngā wai he matūriki, he mirumiru rānei kei roto (hei tauira, te wai para, te paru, ngā wai paru rānei).
• He iti iho te tika i ngā mita wā-haere (±1.0% ki te ±5.0%).
• Ngā Painga:
• Ka taea te ine i te rere o ngā wai mātotoru, ngā wai maha-wāhanga rānei.
• He pai mō ngā mahi ahumahi me ngā mahi waipara.
• Ngā Here:
• Me iti rawa te kukū o ngā matūriki, ngā mirumiru rānei (te tikanga >100 ppm).
• Kāore e tika ana mō ngā wai ma.

He rerekē ngā whakamahinga o ēnei momo e rua, ko ngā mita wā-haere he tino tika mō ngā wai ma, ā, ko ngā mita Doppler he tino pai mō ngā rere uaua, ngā rere wāhanga-whakauru rānei.