We report the discovery and spectroscopic confirmation of 22 new
gravitationally lensed quasars found using $\textit{Gaia}$ data release 2. The
selection was made using several techniques: multiple $\textit{Gaia}$
detections around objects in quasar candidate catalogues, modelling of unWISE
coadd pixels using $\textit{Gaia}$ astrometry, and $\textit{Gaia}$ detections
offset from photometric and spectroscopic galaxies. Spectra of 33 candidates
were obtained with the William Herschel Telescope, 22 of which are lensed
quasars, 2 highly probably lensed quasars, 5 nearly identical quasar pairs, 1
inconclusive system, and 3 contaminants. Of the 3 confirmed quadruply imaged
systems, J2145+6345 is a 2.1 arcsecond separation quad with 4 bright images
($G$=16.86, 17.26, 18.34, 18.56), making it ideal for time delay monitoring.
Analysing this new sample alongside known lenses in the Pan-STARRS footprint,
and comparing to expected numbers of lenses, we show that, as expected, we are
biased towards systems with bright lensing galaxies and low source redshifts.
We discuss possible techniques to remove this bias from future searches. A
|b|>20 complete sample of lensed quasars detected by $\textit{Gaia}$ and with
image separations above 1 arcsecond will provide a valuable statistical sample
of around 350 systems. Currently only 96 known lenses satisfy these criteria,
yet promisingly, our unWISE modelling technique is able to recover all of these
with simple WISE-$\textit{Gaia}$ colour cuts that remove $\sim$80 per cent of
previously followed-up contaminants. Finally, we provide an online database of
known lenses, quasar pairs, and contaminant systems.

报告发现和光谱证实了 22 个新的引力透镜类星体，使用了 Gaia 数据来选择候选样本，并使用了多种技术进行模拟和分析。